JP3505072B2 - Electric blinds - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric blind installed in an opening of a house for the purpose of shading or blinding, and more particularly to an electric blind for opening and closing a plurality of blades using an induction motor.

[0002]

2. Description of the Related Art At present, electric blinds for opening and closing blind blades according to the rotation of an electric motor are widely known.
A DC motor is mainly used as the electric motor. Compared with induction motors, DC motors have the advantage of simplifying the mechanical structure of the electric blinds because they have better controllability for braking and the like, but they have the disadvantage of higher cost.

When an induction motor is used in an electric blind, it may or may not require braking depending on the load. In order to obtain the same braking as a DC motor, it must be used in combination with an electromagnetic brake. There are many. For example,
The induction motor with a brake disclosed in Japanese Utility Model Laid-Open No. 3-54357 has a brake mechanism built in the induction motor, and is braked by a braking plate provided on the rotor when not energized. Then, the rotor is moved in the axial direction by the electromagnetic attraction force received from the stator due to the energization, the braking of the braking plate is released, and the induction motor can be rotated.

Further, in recent years, an electric blind system has been developed in which a plurality of electric blinds are installed in an intelligent building or the like and controlled in conjunction with each other so that the same elevation height and the same opening / closing angle are obtained. For example, in the electric blind disclosed in Japanese Patent Application Laid-Open No. 64-62589 filed by the applicant of the present invention, a disk-shaped encoder having slits and non-slits alternately provided on the lifting shaft, and The induction motor is controlled in synchronization with a pulse signal generated by rotation. Since the induction motor is stopped in synchronization with the pulse generated by the rotation of the lifting shaft, it is possible to easily unify the opening and closing angles of the blades even in the electric blind device including a plurality of units.

The applicant of the present invention has filed Japanese Patent Application No. 9-238351.
The electric blind disclosed in the above publication is for braking an induction motor without using an electromagnetic brake. When the blade is stopped at a desired blade angle, this electric blind stops driving the induction motor and performs a rotating operation in a direction opposite to the rotating direction up to that time for a predetermined time in the numerical table to guide the blade. By stopping the driving of the electric motor, a reverse rotation torque is applied so as to cancel the inertia acting in the same rotation direction, and the blade is stopped at a desired blade angle.

Further, the present applicant has filed Japanese Patent Application No. 9-359087.
The electric blind disclosed in the publication relates to another electric blind for braking an induction motor without using an electromagnetic brake. This electric blind rectifies an alternating current power source to generate a direct current, and selectively outputs the alternating current and the rectified current by a triac to drive or brake the induction motor. When stopping the blade at a desired blade angle, the electric blind stops the drive of the induction motor and applies a rectified current to the stator to generate a magnetic force between the stator and the rotor for braking. ing.

[0007]

However, when an electromagnetic brake is used to open and close the blades of the electric blind, for example, the blade angle is divided into 15 step numbers including horizontal from fully open to fully closed, and the step opening / closing operation is performed. Then, the electromagnetic brake for braking operates at each step.
Therefore, when the blades are continuously step-opened and closed, the operation noise of the electromagnetic brake is continuously generated, and there is a problem that people other than the operator are uncomfortable. It was

When an induction motor is used to open and close the blades of the electric blind, the rotation speed transmitted by the induction motor is different between the electric blinds having different power supply frequencies and different speed reduction mechanisms. Therefore, when the blades are step-opened and closed, the blades of the electric blinds have different step opening and closing speeds, so that the opening and closing angles of the blades of the electric blinds are different in the step opening and closing operations of two or more steps. .

As a solution to these problems, Japanese Patent Application No. 9-23835 filed by the present applicant as described above.
There is an electric blind disclosed in No. 1, but the setting of the reverse rotation operation time is a half cycle unit of the frequency of the AC power supply,
Since it cannot be set more finely, accurate step opening / closing operation cannot be performed. Further, when the load of the blade becomes large, the inertial force due to the load is received, and the induction motor is excessively rotated at the time of opening / closing, so that there is a problem that it can be applied only to a blind having a small load.

There is also an electric blind disclosed in Japanese Patent Application No. 9-359087 filed by the present applicant as described above, but in the case of a blind in which opening and closing of blades and elevation of the blind are driven by one induction motor. Since a large load is applied to the induction motor when stopped, it is necessary to apply a large direct current to the induction motor, and an induction motor that does not cause heat problems must be used. Since the DC power supply converter also becomes expensive, there is a cost problem in obtaining complete braking. Further, since the induction motor rotates in the direction in which the load is applied during the stop period during the step opening / closing operation, there is a problem that this braking method cannot be used for a blind having a large load.

The present invention has been made to solve the above problems, and an object of the present invention is to ensure that the opening / closing angle of the blade of the blind is kept within a desired control angle. It is to provide an electric blind capable of

The object of the invention as set forth in claim 4 is to ensure that the opening / closing angle of the blade of the blind can be kept within the control angle even when the blind is on the upper side and the amount of inertia due to the weight of the blade becomes large. It is to provide an electric blind.

An object of the invention described in claim 5 is to provide an electric blind capable of performing an opening operation so as to cancel out an inertial amount during the opening operation of the blade.

An object of the invention described in claim 6 is to provide an electric blind capable of improving the closing condition of the blind vanes.

An object of the invention described in claim 7 is to provide an electric blind which operates quietly even when an electromagnetic brake is used for braking.

An object of the invention described in claim 8 is to provide an electric blind in which the blade angle can be easily set.

[0017]

An electric blind according to claim 1 includes an induction motor for opening and closing a plurality of blades by rotation, and an instruction means for instructing an opening operation or a closing operation of the plurality of blades. A driving means for driving and braking the induction motor, an angle detection means for outputting a detection signal each time the induction motor rotates by a predetermined angle, and an induction motor for the driving means when there is an instruction from the instruction means. Drive based on the detection signal output from the angle detection means.
And determine whether it is an intermittent opening and closing operation, and multiple blades
Control means for causing the drive means to output a direct current to brake the induction motor each time the motor is continuously rotating and the intermittent opening / closing operation is performed.

When the control means detects the detection signal output from the angle detection means a predetermined number of times, it causes the drive means to brake the induction motor, so that the opening / closing angle of the blade of the blind is surely kept within a desired management angle. It becomes possible.

The electric blind according to a second aspect is the electric blind according to the first aspect, wherein the control means counts a detection signal output from the angle detection means, and a count value by the counting means. Based on the calculation means for calculating the management angle and the instruction means, the drive means drives the induction motor, and the drive means drives the induction motor each time the management angle calculated by the calculation means changes. Drive control means for braking the vehicle.

Since the drive control means causes the drive means to brake the induction motor each time the management angle calculated by the calculation means changes, the opening / closing angle of the blade of the blind can be surely kept within the desired management angle. Becomes

The electric blind according to a third aspect is the electric blind according to the second aspect, wherein the calculating means calculates the management angle based on the counting by the counting means with reference to the stopping time of the ascending and descending.

Since the calculating means calculates the management angle with reference to the time when the elevator is stopped, the management angle can be calculated accurately.

The electric blind according to claim 4 is a rotary blind.
An induction motor for opening and closing multiple blades
An indicator for instructing the opening or closing of a number of blades
Stages and drives for driving and braking the induction motor
Means and the detection signal every time the induction motor rotates a predetermined angle
The angle detection means for outputting
At a certain time, the drive means drives the induction motor to perform angle detection.
When the detection signal output from the output means is detected a predetermined number of times
And control means for causing the drive means to brake the induction motor
And the control means detects the output from the angle detection means.
Counting means for counting the output signals, and counting by the counting means
A calculating means for calculating the management angle based on the numerical value,
When there is an instruction from the instruction means, the induction motor is added to the drive means.
Drive the control angle to change the management angle calculated by the calculation means.
To cause the drive means to brake the induction motor each time
Drive control means, the electric blind further includes a height detecting means for detecting the height of the blind, an upper side height setting means for setting the upper side height of the blind, and a calculating means. If the height of the blind detected by the height detecting means is on the upper side of the upper side height set by the upper side height setting means, the width of the count value by the counting means corresponding to the management angle is And the height of the blind detected by the height detection means is on the lower side of the upper side height set by the upper side height setting means, the count value by the counting means corresponding to the management angle Narrow the width of.

When the height of the blind is on the upper side of the upper side, the calculating means widens the width of the count value by the counting means corresponding to the control angle, so that the inertial amount becomes large. It is also possible to ensure that the opening / closing angle of the blades of the blind is within the control angle.

The electric blind according to a fifth aspect is the electric blind according to the fourth aspect, in which the drive control means detects the blind detected by the height detecting means when the opening operation is instructed by the instructing means. When the height is on the upper side of the upper side height set in the upper side height setting means, the driving means drives the induction motor, and the rear angle detection means in which the management angle calculated by the calculation means changes After detecting the detection signal output from the predetermined number of times, the drive means brakes the induction motor.

When the height of the blind is on the upper side of the upper side, the drive control means brakes the induction motor after detecting the detection signal a predetermined number of times after the control angle changes, so that the inertial amount is reduced. The opening / closing angle of the blade of the blind can be controlled in consideration, and the opening / closing angle can be surely kept within the control angle.

The electric blind according to claim 6 is a rotary blind.
An induction motor for opening and closing multiple blades
An indicator for instructing the opening or closing of a number of blades
Stages and drives for driving and braking the induction motor
Means and the detection signal every time the induction motor rotates a predetermined angle
The angle detection means for outputting
At a certain time, the drive means drives the induction motor to perform angle detection.
When the detection signal output from the output means is detected a predetermined number of times
And control means for causing the drive means to brake the induction motor
And the control means detects the output from the angle detection means.
Counting means for counting the output signals, and counting by the counting means
A calculating means for calculating the management angle based on the numerical value,
When there is an instruction from the instruction means, the induction motor is added to the drive means.
Drive the control angle to change the management angle calculated by the calculation means.
To cause the drive means to brake the induction motor each time
The electric blind further includes drive control means, and the electric blind further includes enlargement instructing means for instructing enlargement of the opening / closing angle range of the plurality of blades. Does not count a predetermined number of times at the end of the control angle.

When the enlargement instructing means gives an instruction to enlarge the opening / closing angle range, the counting means does not perform counting a predetermined number of times at the end of the control angle, so that it is possible to open / close beyond full opening or full closing. It is possible to improve the degree of closing of the blades.

In the electric blind according to a seventh aspect of the present invention, an induction motor for opening and closing a plurality of blades by rotation, an instruction means for instructing an opening operation or a closing operation of the plurality of blades, an induction motor driving and Driving means for braking, angle detecting means for outputting a detection signal each time the induction motor rotates by a predetermined angle, and when the instructing means instructs the driving means to drive the induction motor to detect the angle. Intermittent opening / closing operation based on the detection signal output from the means
, The blades are continuously rotating.
And a control means for causing the drive means to output a direct current to brake the induction motor each time the intermittent opening / closing operation is performed, the control means for counting the detection signals output from the angle detection means. When there is an instruction from the counting means, the calculation means for calculating the management angle based on the count value by the counting means, and the instruction means, the driving means drives the induction motor, and the management angle calculated by the calculation means is The drive means includes drive control means for braking the induction motor each time it changes, and the electric blind further sets a height detection means for detecting the height of the blind and an upper side height of the blind. Upper side height setting means for
The drive control means includes an electromagnetic brake for braking the induction motor, and the height of the blind detected by the height detection means is on the upper side of the upper side height set by the upper side height setting means. In some cases, when there is an instruction from the instruction means, the drive means drives the induction motor, and the drive means and the electromagnetic brake cause the induction motor to brake each time the management angle calculated by the calculation means changes.

When the height of the blind is on the upper side of the upper side, the drive control means causes the drive means and the electromagnetic brake to brake the induction motor each time the management angle calculated by the calculation means changes. Even on the upper side where the inertial amount becomes large, the opening / closing angle of the blade of the blind can be surely kept within the control angle.

According to another aspect of the electric blind of the present invention, an induction motor for opening and closing a plurality of blades by rotation, an instruction means for instructing an opening operation or a closing operation of the plurality of blades, and an induction motor driving and Driving means for braking, angle detecting means for outputting a detection signal each time the induction motor rotates by a predetermined angle, and when the instructing means instructs the driving means to drive the induction motor to detect the angle. Intermittent opening / closing operation based on the detection signal output from the means
, The blades are continuously rotating.
And a control means for causing the drive means to output a direct current to brake the induction motor each time the intermittent opening / closing operation is performed, the control means for counting the detection signals output from the angle detection means. When there is an instruction from the counting means, the calculation means for calculating the management angle based on the count value by the counting means, and the instruction means, the driving means drives the induction motor, and the management angle calculated by the calculation means is The electric blind further includes drive control means for braking the induction motor for each change, and the electric blind further has an angle setting means for setting the opening and closing angles of the plurality of blades, and an opening and closing angle setting by the angle setting means. When there is, first the drive means to drive the induction motor to a specific end angle (“fully open” or “fully closed”), then to the opposite end direction, and control angle And a angle setting control means for braking the induction motor drive means when matching the opening angle set in the angle setting means.

When the opening / closing angle is set by the angle setting means, the angle setting control means first performs the opening / closing operation up to a specific end angle, and then performs the opening / closing operation in the opposite end direction to set the opening / closing angle. In order to make the drive means brake the induction motor so that the opened and closed angle and the management angle match,
Since it is always stopped in the same opening / closing direction, the reproducibility of the blade angle can be improved.

[0033]

1 is a block diagram showing a schematic configuration of an electric blind according to an embodiment of the present invention. The electric blind includes a power supply input unit 1 to which an AC power supply of 100 V is input, a power supply transformer 2, a stabilized power supply unit 3 for converting an AC voltage output from the power supply transformer 2 into a predetermined DC voltage, and a control of the electric blind. (Micro Processing Unit) 4, a zero-crossing detection unit 5 for detecting a zero-crossing point of the voltage of the AC power supply, a motor drive unit 6 for driving the induction motor 7, an electromagnetic brake 8, an open switch. 91, a closing switch 92, an ascending switch 93, a descending switch 94, and a stop switch 95, a command unit 9 including angle setting switches 1001 to 1015 for setting the angle of the blade, a fully open position and a fully open position of the blade. An end management angle width addition switch 11 for increasing the management angle width in the closed position, and determines whether the height of the blind is the upper side or the lower side. For setting the upper side setting switch 12, a reduction mechanism 71 for reducing the rotation of the induction motor 7, an opening / closing drum 13 connected to the reduction mechanism 71 by a shaft, a plurality of blades 14, and the rotation of the opening / closing drum 13 causes the blade 14 to rotate. Ladder code 1 for opening and closing
5, bottom rail 16 provided at the lower end of the blind,
Lifting tabs 17 for raising and lowering the blinds,
And a rotation detector 18 for detecting the angle of the blades 14.
including.

The 100V AC power input to the power input unit 1 is stepped down by the power transformer 2 and supplied to the stabilized power unit 3. The stabilized power supply unit 3 generates and outputs a DC voltage to be supplied to the MPU 4 and the like. Further, the zero-cross detection unit 5 detects that the AC voltage input to the power supply input unit 1 becomes 0V and outputs it as a pulse waveform to the MPU 4.

The 100V AC voltage input to the power supply input section 1 is also supplied to the motor drive section 6. The motor drive unit 6 rectifies the supplied alternating current and selectively outputs the rectified current and the alternating current to the induction motor 7. The electric motor drive unit 6 controls the output of the alternating current and the rectified current based on the control signal output from the MPU 4, and controls the forward rotation, the reverse rotation, and the stop of the induction motor 7. Further, the electric motor drive unit 6 also controls the supply of the AC voltage to the electromagnetic brake 8.

The rotation of the induction motor 7 is reduced by the reduction mechanism 71, and the reduced rotation is transmitted to the open / close drum 13 and the rotation detecting portion 18 by the shaft. The opening / closing drum 13 opens / closes the blades 14 via the ladder cords 15 by the rotation of the shaft. One of the ladder cords 15 is wound around and fixed to the opening / closing drum 13, and the other is provided so as to sandwich the plurality of blades 14 at regular intervals, and the lower end thereof is fixed to the bottom rail 16.

One end of a lifting tape 17 for raising and lowering the blind is fixed to the bottom rail 16. The other end of the lifting tape 17 passes through a through hole formed in the plurality of blades 14 and is fixed to an elevator drum (not shown). The lifting drum and the opening / closing drum 13 are connected by a clutch mechanism (not shown), and the blade 14
Is a mechanism that goes up through the opening direction and descends through the closing direction. That is, when the lifting tape 17 is wound up on the lifting drum, the blades 14 move up after the opening angle reaches the fully open position, and when the lifting tape 17 is rewound from the lifting drum, the blades 14 close at the fully closed position. And then descend.

Further, the rotation detector 18 has a slit 19A.
Disk 1 in which slits and non-slits 19B are alternately provided on the entire circumference
9 and a photo interrupter 20. A transmissive photo interrupter 20 is provided so as to sandwich the disk 19. Light from the light emitting element included in the photo interrupter 20 passes through and is blocked by the slit 19A and the non-slit 19B, and the light receiving element provided facing the light emitting element converts the light pulse into an electric pulse and outputs it. When the shaft connected to the lifting drum rotates to perform the lifting operation, a pulse (hereinafter, referred to as an encoder signal) proportional to the rotation is output from the rotation detection unit 18 and input to the MPU 4. The MPU 4 counts this encoder signal and detects the height position of the blind.

The starting point of the height data is when the upper limit switch that is turned on when the blades 14 and the bottom rail 16 are wound up to the top is turned on, and the count is cleared to obtain the height data. It is set to "0". Also,
On the contrary, a lower limit switch that is turned on when the blind is lowered to the lowermost part is also provided, and the raising / lowering operation can be performed within a range in which the upper limit switch and the lower limit switch are turned on. That is, the value of the height data when the lower limit switch is turned on becomes the maximum value.

When the open switch 91 of the command unit 9 is pressed, the MPU 4 controls the blade 14 to rotate in the opening direction, and when the close switch 92 is pressed, the blade 14 is closed. Control to rotate to.
Further, the angle setting switches 1001 to 101 of the command unit 10
Reference numeral 5 is a switch for setting the angle of the blade. The blade angle refers to a fully open position that is the end of the induction motor 7 in the forward rotation direction (actually, it is fully closed similarly to the end in the reverse direction, but for convenience sake it is called the fully open position). 1 ", the angle at which the blade is horizontal is" 8 ", and the fully closed position which is the end portion in the reversing direction is" 15 ". That is, the fully open position is divided into the fully closed position into 15, and the respective management angles correspond to the angle setting switches 1001 to 1015. For example, if the angle setting switch 1004 is pressed,
The induction motor 7 is rotated normally or reversed from the control angle at the time of command so that the control angle becomes "4", and control is performed so that the blade control angle becomes "4".

The edge management angle width addition switch 11 is a 2-bit switch and is capable of setting data "0" to "3". Edge control angle width additional switch 1
By setting the value set to 1, the management angle width at the fully open position (management angle is “1”) and the fully closed position (management angle is “15”), which are the end portions, is increased to make it a fully open position or a fully closed position. It is possible to increase the opening / closing range width beyond.

The upper-side setting switch 12 is a 4-bit switch and can set a value of "0" to "15". The value set in the upper side setting switch 12 becomes the height for determining whether the height of the blind when performing the opening / closing operation is the upper side or the lower side. As will be described later, when the height of the blind for performing the opening / closing operation is on the upper side, the unit management angle width is increased to perform the opening / closing operation.

The MPU 4 has a RAM (Random Acces
s Memory) is built in, and the height data of the blind calculated by the pulse from the rotation detection unit 18 and the angle counter which is the count value of the pulse output from the rotation detection unit 18 when the ascending / descending is taken as a reference. When the value of the angle counter is the end value, the fully open additional counter and the fully closed additional counter for managing the addition of the end, and the area for storing the management angle data calculated from the value of the angle counter are predetermined. ing.

FIG. 2 is a block diagram showing a schematic structure of the electric motor drive unit 6. The motor drive unit 6 controls the output of the alternating current and the rectified current to the induction motor 7 and the output of the alternating current to the electromagnetic brake 8 under the control of the MPU 4, and the gate control circuit unit 26 and the bidirectional semiconductor switch. Triacs 21 to 24 and a diode 2
Including 5.

When the induction motor 7 is normally rotated, the MPU 4
The gate control circuit unit 26 turns on the triac 21 in response to the instruction from. As a result, the CW (Cl
100V AC voltage is applied between ockWise) and COM (COMmon), and the induction motor 7 rotates in the normal direction.

When the induction motor 7 is rotated in the reverse direction, M
The gate control circuit unit 26 turns on the triac 22 according to an instruction from the PU 4. As a result, the CC of the induction motor 7
An AC voltage of 100 V is applied between W (Counter Clock Wise) and COM, and the induction motor 7 rotates in the reverse direction.

When the induction motor 7 is DC-braked,
The gate control circuit unit 26 turns on the triac 24.
As a result, the current half-wave rectified by the diode 25 flows from CW of the induction motor 7 to COM, and the induction motor 7 is braked.

When the induction motor 7 is normally or reversely rotated, the gate control circuit section 26 turns on the triac 23. As a result, an AC voltage of 100 V is applied to the electromagnetic brake 8 and the braking of the electromagnetic brake 8 is released. In addition,
The capacitor 72 provided between the CW and CCW of the induction motor 7 is a phase advancing capacitor.

FIG. 3 is a diagram showing the relationship among the encoder signal output from the rotation detector 18 shown in FIG. 1, the angle counter, the management angle data, the full open additional counter, and the full closed additional counter. As shown in FIG. 3A, a pulse signal is generated with the rotation of the disk 19 of the rotation detector 18.
The MPU 4 detects the change point of the encoder signal and
The angle counter is incremented from 0 as shown in (b). However, the value of this angle counter indicates when the height of the blind is on the lower side of the height set by the upper setting switch 12.

The MPU 4 calculates the management angle data according to the value of the angle counter. When the blind is below the height set by the upper setting switch 12, the value of the management angle data increases by 1 every time the value of the angle counter increases by 2, as shown in FIG. 3C. When the management angle data is "1", the fully open position is shown, when it is "8", the horizontal position is shown, and when it is "15", the fully closed position is shown.

FIG. 3D shows the management angle data when the height of the blind is higher than the height set by the upper setting switch 12. The value of the management angle data is "1" until the value of the angle counter is "1", but the value of the management angle data is "4" when the value of the angle counter is "2". After that, each time the value of the angle counter increases by 3, the value of the management angle data increases by 1. Then, when the value of the angle counter reaches "29", the value of the management angle data changes from "12" to "15". Thus, when the blind is on the upper side, the width of the management angle data for the angle counter is widened.

Further, FIG. 3E shows the value of the angle counter when "1" is set in the end management angle width addition switch 11, and FIG. The value of the closed additional counter is shown. When "1" is set in the edge management angle width addition switch 11, the count width increases when the angle counters are "2" and "29". That is, the other count values are incremented at the change points of the encoder signal, but only at "2" and "29", the change points of the encoder signal are incremented by two. The angle counter is "2" for the fully open additional counter.
When the angle counter is "29", the fully closed additional counter is incremented.

Next, the raising / lowering operation of the electric blind in this embodiment will be described. When the operator pushes down the raising switch 93 and gives an instruction to raise the blind, the MPU 4 releases the braking of the electromagnetic brake 8 to the electric motor drive unit 6 in synchronization with the zero cross signal from the zero cross detection unit 5. A release ON signal for outputting is output. When the release ON signal is input, the electric motor drive unit 6 receives the triac 23.
Is turned on to apply an AC voltage to the electromagnetic brake 8. At this time, the braking of the electromagnetic brake 8 is released, and the rotor of the induction motor 7 becomes rotatable. Further, the MPU 4 outputs a normal rotation signal for rotating the induction motor 6 in the normal direction to the gate control circuit unit 26. The gate control circuit unit 26 uses the MPU 4
When the normal rotation signal is input from, the triac 21 is turned on, and an AC voltage is applied to the induction motor 7. Since the braking of the electromagnetic brake 8 is released, the normal rotation starts. In general, the rotation of the induction motor 7 is very high, so that the speed reduction mechanism 71 reduces the speed of the blind up and down.

The rotation of the induction motor 7 rotates the lifting drum via the speed reduction mechanism 71 and the shaft, and further rotates the opening / closing drum 13 via the clutch. The lifting tape 17 is rolled up by the rotation of the lifting drum, and the blades 14b mounted on the bottom rail 16 are raised. Further, the rotation of the opening / closing drum 12 causes the blades 14 a suspended by the ladder cord 15 to rotate at the same time. At this time, the bottom rail 16 and the bottom rail 1
The blade 14b mounted on the blade 6 does not rotate and remains as it is. It should be noted that when the full-open angle, which is the end of the blade in the forward rotation direction, is reached, the clutch automatically disengages and the rotation of the open / close drum 16 stops. Therefore, the blade angle during the raising operation of the blind is the fully open angle.

Similarly, in the case of the lowering operation of the blind, the MPU 4 outputs a release ON signal of the electromagnetic brake 8 to the electric motor drive unit 6. The gate control circuit unit 26 turns on the triac 23 to release the braking of the electromagnetic brake 8,
At the same time, the triac 22 is turned on to start reversing the induction motor 7. By rotating the lifting drum, the bottom rail 1
6 and the blades 14b on the bottom rail 16 start descending. Further, the blade 14a suspended by the ladder cord 15 also rotates due to the rotation of the opening / closing drum 13, but the clutch is disengaged at the fully closed angle which is the end portion of the blade in the reverse direction, and the blade angle becomes the fully closed angle. The descent operation of the blind is continued.

When the execution of the raising / lowering operation by the stop switch 95 is completed, the MPU 4 instructs the electric motor drive unit 6 to brake the induction motor 7. The gate control circuit unit 26 is
When there is an instruction to brake the induction motor 7, the triac 2
1, 22 and 23 are turned off, application of the AC voltage to the induction motor 7 is stopped, and the induction motor 7 is braked by the electromagnetic brake 8. At this time, the rotor of the induction motor 7 is braked and the rotation of the induction motor 7 is stopped. When the rotation of the induction motor 7 is stopped, the blade angle is a fully open angle in the case of ascending operation, that is, the control angle is "1".
In the case of the descending operation, the fully closed angle, that is, the management angle becomes “15”.

Next, the closing operation of the blades after the above-described raising operation is stopped will be described. The case where the blind is on the lower side of the upper side height set by the upper side setting switch 12 will be described. Close switch 92 of command unit 9
When is pressed, the MPU 4 instructs the electric motor drive block to invert the induction motor 7 and release the braking of the electromagnetic brake 8. The electric motor drive unit 6 turns on the triacs 22 and 23, and CCW and COM of the induction motor 7 are turned on.
An alternating voltage is applied to the space and the electromagnetic brake 8. Since the blind was stopped by the ascending operation, the blade 14a suspended by the ladder cord 18 is rotated from the fully open angle to the fully closed angle.

Further, the MPU 4 sets an intermittent opening / closing timer for the intermittent opening / closing operation, and 1 is set by this intermittent opening / closing timer.
Flags are set every second. When this flag is set, the MPU 4 again applies the AC voltage for releasing the braking of the electromagnetic brake 8 and reversing the induction motor 7 described above.

FIG. 4 is a flow chart for explaining the processing procedure of the opening / closing operation of the electric blind in the present embodiment. First, it is determined whether the encoder signal from the rotation detector 18 has changed (S1). If the encoder signal does not change (S1, unchanged), the process ends. When the encoder signal changes (S1, change), it is determined whether the rotation direction of the induction motor 7 is forward or reverse (S2). When the rotation direction of the induction motor 7 is reversed (S2, reversed), the height data is incremented (S3).

Then, it is determined whether the angle counter is "2" (S5). When the angle counter is "2" (S5, Yes), it is determined whether or not the full-open additional counter is the value set in the end management angle width additional switch 11 (S6). If the value of the full-open additional counter is the value set in the edge management angle width addition switch 11, step S
Proceed to 12. If the value of the full-open additional counter is smaller than the value set in the edge management angle width additional switch 11, the value of the full-open additional counter is incremented (S
7), the process ends.

When the value of the angle counter is not "2" in step S5 (S5, No), it is determined whether the value of the angle counter is "29" (S8). When the value of the angle counter is not "29" (S8, No), the process proceeds to step S11. When the value of the angle counter is "29" (S8, Yes), it is determined whether or not the value of the fully closed additional counter is the value set in the end management angle width additional switch 11 (S9). If the value of the fully closed additional counter is smaller than the set value, the value of the fully closed additional counter is incremented (S10), and the process ends.

If the value of the fully closed additional counter is the set value in step S9, the value of the angle counter is "3".
It is determined whether or not it is "1". The value of the angle counter is "3".
In the case of 1 "(S11, Yes), the process proceeds to step S13. In addition, when the value of the angle counter is not" 31 "(S)
11, No), the value of the angle counter is incremented (S12), and the process proceeds to step S13.

Further, in step S2, when the rotation direction of the induction motor 7 is normal rotation (S2, normal rotation), the value of the height data is decremented (S30), and whether the value of the angle counter is "2". It is determined whether or not (S31). When the value of the angle counter is "2" (S31, Yes), it is determined whether the value of the full-open addition counter is "0" (S3).
2). If the value of the fully open addition counter is "0", the process proceeds to step S38. If the value of the full-open additional counter is larger than "0", the value of the full-open additional counter is decremented (S33), and the process is terminated.

When the value of the angle counter is not "2" in step S31 (S31, No), it is determined whether the value of the angle counter is "29" (S3).
4). When the value of the angle counter is not "29" (S3
4, No), and proceeds to step S37. When the value of the angle counter is “29” (S34, Yes), it is determined whether the value of the fully closed additional counter is “0” (S).
35). When the value of the fully closed additional counter is larger than “0”, the value of the fully closed additional counter is decremented (S3
6), the process ends. If the value of the fully closed addition counter is "0", it is determined whether the angle counter is "0" (S37). When the value of the angle counter is "0" (S37, Yes), the process proceeds to step S13. If the value of the angle counter is not "0" (S37, No),
The value of the angle counter is decremented (S38), and the process proceeds to step S13.

In step S13, the management angle is calculated with reference to the relationship between the angle counter and the management angle data shown in FIG. Then, when the value of the management angle has not changed (S14, not changed), the processing is ended. Further, when the value of the management angle has changed (S14, change), it is determined whether the value of the management angle is the end (“1” or “15”) (S15). When the control angle is at the end (S15, Ye
s), the application of the AC voltage to the electromagnetic brake 8 is stopped, the induction motor 7 is braked (S20), and the process ends. Moreover, if the value of the management angle is not the end portion (S15, No),
It is determined whether or not the instruction by the open switch 91 or the close switch 92 has stopped (S16). When the instruction by the open switch 91 or the close switch 92 is stopped (S16,
Yes), the application of the AC voltage to the electromagnetic brake 8 is stopped (S20), and the process ends. Also, the open switch 91
Alternatively, when the instruction by the closing switch 92 is not stopped (S16, No), it is determined whether or not the operation is an intermittent opening / closing operation (S17). If it is an intermittent opening / closing operation (S17, Ye
s), a rectification current is applied to the induction motor 7 for braking (S1
8), the process ends. If it is not the intermittent opening / closing operation (S17, No), it is determined whether the management angle is a stop setting angle described later (S19). If the control angle is the set stop angle (S19, coincidence), an AC voltage is applied to the electromagnetic brake 8 to brake the induction motor 7 (S20), and the process ends. If the management angle is not the stop setting angle (S19, no match), the process is terminated.

Following the procedure described above, the closing operation of the blade after the raising operation of the blind is stopped will be described. First, if the encoder signal changes (S1, change), since the closing operation of the blade, that is, the rotation direction of the induction motor 7 is reversed (S2, reverse), the height data is incremented (S3). Since the value of the angle counter is "0" when the operation of raising the blind is stopped, step S1
In 2 the angle counter is incremented to "1"
(S12).

Then, the management angle data is calculated as "1" from the relationship between the angle counter shown in FIG. 3 (b) and the management angle data shown in FIG. 3 (c) (S13). At this time,
Since the value of the management angle has not changed (S14, no change), the process is ended as it is.

Then, when the encoder signal changes (S
1, change) and the height data is incremented (S
3), it is determined that the value of the angle counter is "2" (S
5, Yes), and proceeds to step S6. In step S6, it is determined whether or not the value of the full-open additional counter is the value set in the end management angle width additional switch 11,
It is assumed that “0” is set in the edge management angle width addition switch 11. Since the value of the full open additional counter matches the value “0” set in the end management angle width addition switch 11, the value of the angle counter is incremented (S
12), the value of the management angle is calculated (S13). The value of the management angle remains "1" and does not change (S14,
(No change), the process ends.

By repeating the processing shown in FIG. 4, it is determined whether or not the value of the calculated management angle changes each time the value of the angle counter is incremented (S14). If the management angle has changed (S14, change), the management angle is not at the end (S15, No), there is no stop instruction by the closing switch 92 (S16, No), and if it is an intermittent opening / closing operation (S1).
(7, Yes), the rectified current is output to the induction motor 7 for braking (S18). As described above, since the MPU 4 sets the intermittent opening / closing timer and applies the AC voltage to the induction motor 7 when the flag is set, the step S18 is performed.
The direct-current braking performed at 1 is stopped.

When the control angle changes (S14, change) and the control angle data is "15", that is, at the end (S15, Yes), an AC voltage is applied to the electromagnetic brake 8 to induce the induction motor. 7 is braked (S20). When the management angle is not at the end (S15, No) and there is a stop instruction by the closing switch 92 (S16, Ye).
s), similarly, an AC voltage is applied to the electromagnetic brake 8 to brake the induction motor 7 (S20). Further, when the end management angle width addition switch 11 is set to "1" and the value of the angle counter is determined to be "2" (S5, Ye
s), the value of the full-open addition counter is compared with the value set in the edge management angle width addition switch 11 (S6). Since the value of the full-open additional counter is "0", the value of the full-open additional counter does not match the value set in the end management angle width addition switch 11, and the value of the full-open additional counter is incremented (S7), The process is terminated as it is. Therefore, even if the encoder signal changes, the value of the angle counter is not incremented, and as shown in FIG. 3E, the width of the value “2” of the angle counter is twice the normal count value. Becomes The value of the full-open addition counter at this time is updated from "0" to "1" as shown in FIG. In this way, since the change in the encoder signal is not counted once, the induction motor 7 is reversed by one extra change in the encoder signal.

Next, the opening / closing operation when the height of the blind is on the upper side of the height set by the upper side setting switch 12 will be described. The calculation of the management angle in step S13 is performed based on the management angle data shown in FIG. That is, while the value of the management angle data is between "4" and "12", the angle counter is incremented or decremented by 3 counts.
Therefore, when the blind is below the upper side height set by the upper side setting switch 12, the blades are intermittently opened and closed by 15 steps, but when the blind is on the upper side, 11 steps are performed. It becomes an intermittent opening and closing operation.

As described above, even when the blind is on the upper side and the inertial amount due to the weight of the blade is large,
It was possible to ensure that the opening and closing angle of the blind blades was within the desired control angle.

By setting the edge management angle width addition switch, it is possible to improve the tightness of the blade.

Further, since the electromagnetic brake is not used during the intermittent opening / closing operation, the operating noise can be made quiet.

FIG. 5 is a flow chart showing the processing procedure of the angle setting operation of the electric blind in the present embodiment. This angle setting operation is performed by the angle setting switch 1001.
Is an operation performed when -1015 are pressed,
The opening / closing angle is determined corresponding to each of the angle setting switches 1001 to 1015.

First, the MPU 4 has the angle setting switch 10
It is determined whether any one of 01 to 1015 is pressed (S41). If the angle setting signal from any of the angle setting switches is not input to the MPU 4 (S41, N
o), the process proceeds to step S51. Also, the angle setting signal is M
If input to PU4 (S41, Yes), the current operation of the electric blind is determined (S42). If the current operation of the electric blind is stopped (S42, stopped), the process proceeds to step S44. If the current operation of the electric blind is in the normal rotation, that is, the blind is rising or the blades are opening (S42, normal rotation), a rectification current is applied to the induction motor 7 to perform direct current braking ( S4
3). Then, in step S44, the value of the angle setting operation management counter is set to "1".

In step S42, if the operation of the electric blind is reversing, that is, the blind is descending or the blade is closing (S42, reversing), the stop setting angle is set to "15" (full closing angle). The angle setting operation management counter is set to "2" (S45).

Next, it is determined whether or not the operation of the electric blind is stopped (S51). If the electric blind is in operation (S51, No), the process is terminated. When the electric blind is stopped (S51, Y
es), the value of the angle setting operation management counter is determined (S52). If the value of the angle setting operation management counter is "0" (S52, 0), the process is terminated. If the value of the angle setting operation management counter is "1" (S52, 1), the blade closing operation is set, the stop setting angle is set to "15", and the value of the angle setting operation management counter is set. The value is set to "2" (S53), and the process ends. Also,
If the value of the angle setting operation management counter is "2" (S5)
2, 2), the opening operation of the blades is set, the stop set angle is set to the angle set value set in the command unit 10, the value of the angle setting operation management counter is set to "0" (S54), and the processing ends. .

Next, a specific operation when the command unit 10 sets "12" as the angle set value will be described. First, when the angle setting switch 1012 is pressed (S41, Yes), the operation mode is determined (S4).
2). If the electric blind is stopped, "1" is set in the angle setting operation management counter (S44), and it is determined in step S51 that the blind is stopped (S51, Ye).
s), the value of the angle setting operation management counter is determined to be "1" in step S52 (S52, 1).

In step S53, the closing operation of the blade is set, "15" is set as the value of the set stop angle, and the value of the angle setting operation management counter is updated to "2". By setting the closing operation of this blade, the MPU
4 reverses the induction motor 7. The encoder signal output from the rotation detection unit 18 changes due to this reversing operation, so that the processing of the opening / closing operation shown in FIG. 4 is performed.

Step S1 of the flowchart shown in FIG.
In step 7, it is not judged as an intermittent opening / closing operation (S17, N
o) In step S19, it is determined whether the management angle matches the stop setting angle. Step S53 in FIG.
Since the stop setting angle is set to “15” in step S1, the management angle and the stop setting angle do not match (S1
(9, disagreement), and the processing ends. By repeating the process shown in FIG. 4, the value of the management angle is incremented, and when the value of the management angle becomes “15”, it is determined to be the end portion in step S15 (S15, Y
es), the induction motor 7 is braked by the electromagnetic brake 8 (S20).

By the above processing, the blade angle is fully closed and the operation of the electric blind is stopped. Until the blade angle reaches "15", it is determined in step S51 of the flowchart shown in FIG. 5 that the operation of the electric blind is not stopped (S51, No), and the processing shown in FIG. 5 is not performed. .

When the operation of the electric blind is stopped (S51, Yes), the value of the angle setting operation management counter is judged to be "2" in step S52 (S52,
2) The blade opening operation is set, the angle setting value set by the command unit 10 is set as the stop setting angle, and the value of the angle setting operation management counter is cleared (S54).

The MPU 4 rotates the induction motor 7 in the normal direction, and performs the processing shown in the flowchart of FIG. 4 every time the encoder signal output from the rotation detecting section 18 changes. That is, in step S19, the forward rotation operation of the induction motor 7 is repeated until the control angle and the set stop angle match. In this way, when the control angle becomes "12" which is the set stop angle, the AC voltage is applied to the electromagnetic brake 8 to brake the induction motor 7.

When the angle setting operation is performed by the command unit 10 during the reversing operation of the electric blind, it is determined in step S42 of FIG. 5 that the operation mode is reversing (S42, reversing), and the stop setting angle is set. "15" is set, and the value of the angle setting operation management counter is updated to "2". (S45). That is, the inversion operation currently being executed is continuously performed, and after the inversion operation is completed, the same processing as the above-described processing is performed.

As described above, by setting the angle setting switch, it is possible to set an arbitrary blade angle by the opening operation from the fully closed to the management angle "15" without fail.

In the angle setting operation shown in FIG. 5, except when the angle set value is set by the command unit 10, for example, when the blind is stopped after the raising / lowering operation, the opening / closing angle of the blade before the raising / lowering start is set again. It can also be applied to the case. That is, it is effective when it is desired to set the opening / closing angle of the blades before the start of raising / lowering the blind after the end of raising / lowering the blind.

When the blind is on the upper side, as shown in FIG. 3 (d), the management angle data "2",
Although "3", "13", and "14" do not exist, when these values are set by the command unit 10, the angle set values "2" and "3" are changed to the angle set value "1".
When the angle setting values are “13” and “14”, the angle setting operation described above can be performed by setting the angle setting value to “15”.

In the above-described embodiment, the rectification voltage is applied to the induction motor 7 to perform DC braking when the control angle data changes during the blade opening operation and the blade closing operation. However, since the induction motor 7 slowly rotates in the opposite direction, that is, in the direction of closing operation due to the load even when the direct-current braking is performed during the opening operation, the direct-current braking does not occur when the management angle data changes, but rather when the management angle data changes. By performing DC braking with the next angle counter value that has changed, it becomes possible to cancel the reverse rotation of the induction motor 7. Therefore, even when the height of the blind, which increases the load, is on the upper side, the blind can be reliably stopped within the control angle range. For example, in FIG.
As shown in (b) and FIG. 3 (d), when the value of the angle counter becomes “28” during the blade opening operation, the value of the management angle data becomes “12”, but the value of the angle counter becomes The value of the management angle data may be set to “12” when it becomes “27”. However, when the value of the angle counter becomes "26", the value of the management angle data becomes "1".
When set to 2 ", the margin in the control angle range increases, but the inertial force in the rotation direction at the time of stop also increases,
This inertial force may exceed the control angle, which is not preferable. Further, a setting switch for setting the shift number of the management angle data with respect to the angle counter may be provided so that an arbitrary value can be set.

Further, in the above-mentioned embodiment,
By increasing the control angle width on the upper side where the load increases, the intermittent opening and closing is ensured to be within the control angle width, but the reliability of the operation is prioritized over the suppression of the operation noise during the intermittent opening and closing operation. It is also possible to brake. That is, during intermittent operation when the height of the blind is on the upper side, a rectifying current is applied to the induction motor 7 to perform DC braking, and the electromagnetic brake 8 is also applied.
The application of the AC voltage to the motor is stopped and the braking by the electromagnetic brake 8 is applied.

In the angle setting operation described with reference to FIG. 5, the blade start angle is set to the fully closed position.
It may be in the fully open position. Further, a setting switch may be provided so that the operator can select the start angle of the blade from the fully closed position or the fully opened position.

In the opening / closing operation shown in FIG. 4, the processing other than the angle setting operation is the intermittent opening / closing operation, but it is also possible to continuously open / close the induction motor without DC braking.

As shown in FIG. 3 (e), when the edge management angle width addition switch 11 is set to "1", the widths when the value of the angle counter is "2" and "29". Although it is twice the width of the other count values, the angle counter shown in FIG. 3B is used, and the correspondence between the angle counter and the management angle data is changed to add a fully open counter or a fully closed counter. It is also possible to perform the same processing as the processing using the additional counter.

Further, as shown in FIG. 3, the correspondence between the angle counter and the management angle data is fixed, but the correspondence table is stored in EEPROM (Electrically Erasable and Pr).
ogrammable Read Only Memory), etc., it is possible to set an arbitrary value even after installing the electric blind.

When the blind is on the upper side,
Although the angular width at the end is not expanded by the fully open additional counter or the fully closed additional counter, the same effect can be obtained by performing the same processing as when the blind is on the lower side.

Further, the edge management angle width addition switch 11
Is common to the fully open position and the fully closed position, but can be provided separately.

Further, although the height of the upper side setting by the upper side setting switch 12 is 16 steps, it may be set more finely.

Further, the rectifying current is applied to the induction motor 7 only during the intermittent opening / closing operation to perform DC braking. However, even when the blade ends are stopped and the blind is stopped after the raising / lowering operation, a certain period of time, for example, about a certain amount. It is also possible to perform DC braking for 1 second, and to perform braking more effectively in addition to the braking by the electromagnetic brake 8.

As a braking method at the time of intermittent opening / closing operation,
Although DC braking is used, when the rotation of the induction motor 7 is stopped, the induction motor 7 may be rotated in the opposite direction for a certain period of time to perform braking. Also,
Although the same induction motor 7 is used for raising and lowering the blind and for opening and closing the blades, different induction motors may be used.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of an electric blind according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a schematic configuration of a motor drive unit 6 shown in FIG.

FIG. 3 is a diagram showing a relationship among an encoder signal output from a rotation detection unit 18, an angle counter, management angle data, a fully open additional counter, and a fully closed additional counter.

FIG. 4 is a flowchart showing a processing procedure of an opening / closing operation of the electric blind in the embodiment of the present invention.

FIG. 5 is a flowchart showing a processing procedure of an angle setting operation of the electric blind according to the embodiment of the present invention.

[Explanation of symbols]

1 Power input section 2 power transformer 3 stabilized power supply 4 MPU 5 Zero cross detector 6 Electric motor drive 7 induction motor 8 electromagnetic brake 9, 10 Command unit 11 Edge control angle width addition switch 12 Upper setting switch 13 Opening and closing drum 14 feathers 15 ladder coat 16 bottom rail 17 Lifting tape 18 Rotation detector 19 discs 20 Photointerrupter 21-24 Triac 25 diodes 71 Reduction mechanism 72 Phase advance capacitor

Continuation of the front page (56) References JP-A-64-62589 (JP, A) JP-A-4-85478 (JP, A) JP-A-4-49395 (JP, A) JP-A-5-137365 (JP , A) JP-A-7-69582 (JP, A) Actual development 3-54357 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) E06B 9/32

Claims (8)

(57) [Claims] 1. An induction motor for opening and closing a plurality of blades by rotation, instruction means for instructing an opening operation or a closing operation of the plurality of blades, and a drive for driving and braking the induction motor. Means, an angle detection means for outputting a detection signal each time the induction motor rotates by a predetermined angle, and the driving means for driving the induction motor when the instruction means gives the angle detection means. Based on the detection signal output from
It is determined whether or not there is an open / close operation, and the multiple blades are connected.
An electric blind including: control means for causing the drive means to output a direct current to brake the induction motor each time the continuous rotation is performed and the intermittent opening / closing operation is performed . 2. The control means, counting means for counting the detection signals output from the angle detection means, calculation means for calculating the management angle based on the count value by the counting means, Drive control means for causing the drive means to drive the induction motor when there is an instruction from the instruction means, and for causing the drive means to brake the induction motor each time the management angle calculated by the calculation means changes. The electric blind according to claim 1, comprising: 3. The electric blind according to claim 2, wherein the calculating means calculates the management angle based on the count by the counting means with reference to the time when the elevator is stopped. 4. An induction motor for opening and closing a plurality of blades by rotation, instruction means for instructing an opening operation or a closing operation of the plurality of blades, and a drive for driving and braking the induction motor. Means, an angle detection means for outputting a detection signal each time the induction motor rotates by a predetermined angle, and the driving means for driving the induction motor when the instruction means gives the angle detection means. And a control means for causing the drive means to brake the induction motor when the detection signal output from the angle detection means is detected a predetermined number of times, the control means counting the detection signal output from the angle detection means. Counting means for calculating the management angle based on the count value by the counting means, and the driving means when the instruction means The drive means for driving the induction motor, and causing the drive means to brake the induction motor each time the management angle calculated by the calculation means changes; and the electric blind further includes a height of the blind. Including a height detecting means for detecting, and an upper side height setting means for setting an upper side height of the blind, the calculating means, the height of the blind detected by the height detecting means. Is on the upper side of the upper side height set in the upper side height setting means, the width of the count value by the counting means corresponding to the management angle is widened, by the height detection means When the detected blind height is on the lower side of the upper side height set by the upper side height setting means, the width of the count value by the counting means corresponding to the management angle is narrowed. To, electric blind. 5. The drive control means sets the height of the blind detected by the height detection means to the upper side height setting means when the opening operation is instructed from the instruction means. When it is on the upper side of the upper side height, the drive means is driven to drive the induction motor, and the detection signal output from the angle detection means is detected a predetermined number of times after the management angle calculated by the calculation means is changed. The electric blind according to claim 4, wherein the drive means then brakes the induction motor. 6. An induction motor for opening and closing a plurality of blades by rotation, instruction means for instructing an opening operation or a closing operation of the plurality of blades, and a drive for driving and braking the induction motor. Means, an angle detection means for outputting a detection signal each time the induction motor rotates by a predetermined angle, and the driving means for driving the induction motor when the instruction means gives the angle detection means. And a control means for causing the drive means to brake the induction motor when the detection signal output from the angle detection means is detected a predetermined number of times, the control means counting the detection signal output from the angle detection means. Counting means for calculating the management angle based on the count value by the counting means, and the driving means when the instruction means The drive means for driving the induction motor and causing the drive means to brake the induction motor each time the management angle calculated by the calculation means changes; and the electric blind further includes the plurality of blades. Of the opening / closing angle range, the counting means performs counting a predetermined number of times at the end of the management angle when the opening / closing angle range is instructed to be expanded by the expansion instructing means. No electric blinds. 7. An induction motor for opening and closing a plurality of blades by rotation, instruction means for instructing an opening operation or a closing operation of the plurality of blades, and a drive for driving and braking the induction motor. Means, an angle detection means for outputting a detection signal each time the induction motor rotates by a predetermined angle, and the driving means for driving the induction motor when the instruction means gives the angle detection means. Based on the detection signal output from
It is determined whether or not there is an open / close operation, and the multiple blades are connected.
And a control means for causing the drive means to output a direct current to brake the induction motor each time the continuous rotation is performed and the intermittent opening / closing operation is performed, and the control means is output from the angle detection means. Counting means for counting the detection signals, calculating means for calculating the management angle based on the count value by the counting means, and when the instructing means gives an instruction, the driving means includes the induction motor. Drive control means for causing the drive means to brake the induction motor each time the management angle calculated by the calculation means changes, and the electric blind further detects the height of the blind. Height detecting means, upper side height setting means for setting the upper side height of the blind, and an electromagnetic brake for braking the induction motor. When the height of the blind detected by the height detection means is on the upper side of the upper side height set by the upper side height setting means, the drive control means gives an instruction from the instruction means. An electric blind that causes the drive means to drive the induction motor, and causes the drive means and the electromagnetic brake to brake the induction motor each time the management angle calculated by the calculation means changes. 8. An induction motor for opening and closing a plurality of blades by rotation, instruction means for instructing an opening operation or a closing operation of the plurality of blades, and a drive for driving and braking the induction motor. Means, an angle detection means for outputting a detection signal each time the induction motor rotates by a predetermined angle, and the driving means for driving the induction motor when the instruction means gives the angle detection means. Based on the detection signal output from
It is determined whether or not there is an open / close operation, and the multiple blades are connected.
And a control means for causing the drive means to output a direct current to brake the induction motor each time the continuous rotation is performed and the intermittent opening / closing operation is performed, and the control means is output from the angle detection means. Counting means for counting the detection signals, calculating means for calculating the management angle based on the count value by the counting means, and when the instructing means gives an instruction, the driving means includes the induction motor. And driving control means for causing the driving means to brake the induction motor each time the management angle calculated by the calculation means changes, and the electric blind further controls the opening and closing angles of the plurality of blades. When the angle setting means for setting and the opening / closing angle are set by the angle setting means, first, the induction motor is set to the drive means up to a specific end angle. Angle setting control means for causing the drive means to brake the induction motor when the control angle matches the opening / closing angle set in the angle setting means. Electric blinds including and.