JP4986541B2 - Elevator control device - Google Patents

Description

  The present invention relates to an elevator control device that converts alternating current supplied from an alternating current power source into direct current, further converts this direct current into alternating current with an inverter, and supplies the car to an electric motor that moves up and down.

  2. Description of the Related Art Conventionally, in an elevator system provided in a building or the like, a rope having cages and suspension weights attached to both ends is hung on a sheave of an electric motor provided on the upper side of a hoistway. Usually, the weight of the suspension weight is adjusted to be approximately equal to the weight of the half loaded capacity. Thus, if the car load is not half of the capacity load, the car and the counterweight will be unbalanced. Therefore, when the passenger car not on board is stopped on each floor and the driving force of the electric motor is stopped, the car is stationary so that the car does not run by the unbalanced weight of the car and the counterweight. A brake device for holding is incorporated.

  This brake device has a mechanism that presses a brake shoe against a movable part (rotating drum) with a biasing force of a spring and brakes with a frictional force when the power is not turned on. And when starting the electric motor of a braking (brake) state with this brake device, a brake release signal is sent to a brake device, a spring is opened with the magnetic force of an electromagnet, for example, and a brake shoe is moved from a movable part (rotating drum). Release. Therefore, in a state where the elevator system is not operating, the brake device maintains a braking (braking) state with respect to the electric motor.

  Further, in addition to the above-described normal driving state, some abnormality is detected in the elevator, and the braking force by this brake device is also used for emergency braking of the car when the car is urgently stopped. .

  If the brake device installed in the elevator breaks down and the brake shoe is separated from the movable part (rotating drum) even when the power is cut off, a brake signal is sent to the brake device when the car stops on each floor However, if the car and the counterweight are not suspended, the car will self-propel and enter a dangerous state.

  Or, if the brake system is malfunctioning and the elevator detects an abnormality and makes an emergency stop, the braking force to decelerate the car has no effect or has been reduced. The car cannot be sufficiently decelerated and the car cannot stop before the end of the hoistway, resulting in a dangerous situation.

  In order to avoid a dangerous state caused by the occurrence of a failure of the brake device described above, Patent Document 1 proposes a technology that uses both the brake device and regenerative braking during an emergency stop. This regenerative braking is also called a dynamic brake, in which a braking impedance is connected to a winding of an electric motor, and an induced voltage generated in the winding is consumed by this braking impedance to obtain a braking force.

This regenerative braking function can establish a field magnetic flux independently without supplying electric power to the power winding, or a permanent magnet synchronous motor or a separately excited DC motor in which the field magnetic flux is always established. It is effective for linear motors.
Japanese Patent No. 2526732

  However, in the dynamic brake configured as described above, there are a load resistor that consumes the energy of regenerative power generated by the motor, a contact for disconnecting each load resistor from the power line during normal operation, and a contact for disconnecting the motor and the load resistor from the inverter during braking. is necessary. As a result, the manufacturing cost of the entire elevator control device increases, and the elevator control device increases in size.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an elevator control device that can realize a regenerative braking function while suppressing an increase in manufacturing costs and an increase in the size of the device.

That is, an elevator control device according to the present invention includes a rectifier circuit that converts AC power from an AC power source into DC power, a smoothing capacitor that smoothes pulsation of DC power converted by the rectifier circuit, a diode, and a switching element. And an inverter that converts the smoothed DC power into AC power having a variable voltage and variable frequency and outputs the AC, and a car driven by the AC power output from the inverter. An electric motor to be moved up and down, traveling control means for performing energization cutoff control of each switching element of the inverter so that AC power of the variable voltage and variable frequency is output according to a predetermined operation pattern, and movement of the car in an emergency Emergency braking device that mechanically brakes the vehicle, and the movement of the car is stopped by the emergency braking device In this case, the switching elements on the one pole side of the switching elements on the positive electrode side and the switching elements on the negative electrode side of the inverter are kept closed, and the switching elements on the other pole side are opened. A regenerative braking control unit that regeneratively brakes the electric motor by maintaining the electric motor ;

  According to the present invention, it is possible to realize a regenerative braking function while suppressing an increase in manufacturing costs and an increase in the size of the apparatus.

Embodiments of the present invention will be described below with reference to the drawings.
(First embodiment)
A first embodiment of the present invention will be described.
First, the dynamic brake will be described. FIG. 1 is a diagram showing a configuration example of a dynamic brake of an elevator control device according to a first embodiment of the present invention.

  In the dynamic brake shown in FIG. 1, the three-phase alternating current supplied from the AC power source, that is, the alternating current power source is full-wave rectified to direct current by the rectifier circuit 11, and the ripple component is absorbed by the smoothing capacitor 10 and supplied to the inverter circuit. A series circuit of the braking resistor 8 and the braking resistor energizing element 9 is provided at both ends of the smoothing capacitor 10.

  In this inverter circuit, six parallel circuits 7 of diodes 33 and switching elements 34 are bridge-connected. Then, each switching element 34 of this inverter circuit is controlled to be turned off at high speed by each PWM (pulse width modulation) signal from an operation control unit (not shown), so that the input direct current has three frequencies and arbitrary voltages. It is converted into phase alternating current and supplied to the electric motor 1.

  When stopping the motor 1, the three switching elements 34 on the positive side of the inverter circuit are maintained in an open state (OFF), and the three switching elements 34 on the negative side are maintained in a closed state (ON). Send voltage indication.

  Then, a closed circuit is formed by the three switching elements 34 closed on the negative electrode side of the inverter circuit and the field winding of the electric motor 1. Therefore, the energy of the regenerative power due to the electromotive force generated in the field winding is consumed in each field winding while the current of the regenerative power flows through the closed circuit described above. Therefore, a braking force is applied to the electric motor 1 and the electric motor 1 is stopped in a short time.

FIG. 2 is a diagram illustrating a configuration example of a conventional elevator dynamic brake.
In the dynamic brake shown in FIG. 2, the three-phase alternating current supplied from the AC power source, that is, the alternating current power source is full-wave rectified to direct current by the rectifier circuit 11, and the ripple component is absorbed by the smoothing capacitor 10 and supplied to the inverter circuit at the subsequent stage. The A series circuit of the braking resistor 8 and the braking resistor energizing element 9 is provided at both ends of the smoothing capacitor 10.

In the inverter circuit, six parallel circuits 7 of diodes 33 and switching elements 34 are bridge-connected. Then, each switching element 34 of this inverter circuit is controlled to be turned off at high speed by each PWM (pulse width modulation) signal from an operation control unit (not shown), so that the input direct current has three frequencies and arbitrary voltages. It converts into a phase alternating current and supplies it to the electric motor 1 through the conductor contact 31 and a power line.
A load resistor 30 for energy consumption of regenerative power is connected between the power lines via conductor contacts 32.

  In such an elevator control apparatus, in a normal state, the conductor contact 31 is closed and the conductor contact 32 is opened. Therefore, the electric motor 1 is driven by the three-phase alternating current supplied from the inverter circuit.

  When stopping the motor 1, the brake device for mechanical braking is operated, and all PWM signals for the switching elements 34 of the inverter circuit are turned off to stop the DC / AC conversion operation of the inverter circuit. And the conductor contact 31 is opened and the conductor contact 32 is closed. Therefore, the energy of the regenerative electric power generated in the electric motor 1 is consumed by the load resistor 30, so that the braking force is applied to the electric motor 1 and the electric motor 1 is stopped in a short time.

  Comparing the dynamic brake shown in FIG. 1 and FIG. 2, the dynamic brake shown in FIG. 1 does not require the load resistor 30 and the conductor contacts 31, 32 as shown in FIG. The apparatus can be reduced in size.

  Next, the elevator control apparatus having the dynamic brake shown in FIG. 1 will be described. FIG. 3 is a diagram illustrating a configuration example of the elevator control device according to the first embodiment of the present invention.

  Of the configuration shown in FIG. 3, the description of the same parts as those shown in FIG. 1 is omitted. In the elevator control device shown in FIG. 3, the electric motor 1 controls the rotation of the main sheave 41. The main sheave 41 and the two sub sheaves 42 and 43 are hung by the rope 2 having both ends fixed to the ceiling 44 of the hoistway, and the car sheave 3 and the counterweight 4 are attached to each of the sub sheaves 42 and 43. .

The elevator control device also includes a travel command unit 12, a speed control command unit 13, a current control command unit 14, a current detection unit 15, a PWM signal generation unit 16, a winding short-circuit command unit 17, and a brake abnormality detection unit 18. .
The current value between the inverter circuit and the electric motor 1 is detected by the current detection unit 15 and input to the current control command unit 14.

  Three first switches 45 are provided between the winding short-circuit command unit 17 and the PWM signal generation unit 16. These first switches 45 are connected in a one-to-one relationship with three terminals on the second switch 46 side on the current control command unit 14 side or three terminals on the winding short-circuit command unit 17 side. The second switch 46 is a switch that can be switched between a terminal on the current control command unit 14 side and a ground terminal.

When traveling the car 3, the travel command unit 12 outputs a brake release signal and connects the second switch 46 to the current control command unit 14 side.
The travel command unit 12 also outputs a brake release signal to the brake abnormality detection unit 18. The brake abnormality detection unit 18 has a switching function of the first switch 45, and when the brake release signal is input from the travel command unit 12, the first switch 45 is connected to the current control command unit 14 side.

  The rotation angle detection unit 6 detects the rotation angle of the electric motor 1. The detection result by the rotation angle detection unit 6 is input to the speed control command unit 13. The speed control command unit 13 calculates the rotation speed of the electric motor 1 based on the rotation angle from the rotation angle detection unit 6.

  The speed control command unit 13 instructs the current control command unit 14 so that the calculated speed becomes a series of traveling speeds of acceleration, constant speed, and deceleration from the departure floor to the arrival floor in the operation of the car 3. A torque current command for the electric motor 1 is output.

  The current control command unit 14 outputs a three-phase voltage command to the PWM signal generation unit 16 so that the current detected by the current detection unit 15 becomes a current corresponding to the torque current command. The PWM signal generator 16 sends a PWM signal to each switching element 34 of the inverter circuit so that a voltage corresponding to a voltage command is output to the electric motor 1. That is, the PWM signal generation unit 16 functions as a travel control unit that performs energization cutoff control of each switching element 34 of the inverter circuit so that AC power with variable voltage and variable frequency is output according to a predetermined operation pattern.

  When the car 3 reaches the vicinity of the destination floor, the travel command unit 12 sends a brake signal to the friction brake device 5 and the brake abnormality detection unit 18 which are brake devices that mechanically brake the movement of the car 3. The friction brake device 5 is brought into a braking (braking) state with respect to the electric motor 1, and the second switch 46 is switched to the ground terminal side. That is, the travel command unit 12 functions as a brake control unit that operates the friction brake device 5 so as to brake the movement of the car 3 when the car 3 is landed.

  The friction brake device 5 outputs a state signal indicating the open / close state of the friction brake to the brake abnormality detection unit 18. When the brake abnormality detection unit 18 inputs the brake signal from the travel command unit 12, if the state signal from the friction brake device 5 is a signal indicating the release of the friction brake, the friction brake is not closed. In order to operate the dynamic brake, a stop command signal for the car 3 is output to the travel command unit 12 and a first switch 45 connected to the PWM signal generation unit 16 is wound from the current control command unit 14 side. Switch to the short-circuit command unit 17 side. That is, the brake abnormality detection unit 18 functions as an abnormality detection unit that detects an abnormality in the operation of the friction brake device 5 when the car 3 is landing.

  The winding short-circuit command unit 17 opens one of the three switching elements on the positive electrode side and the three switching elements on the negative electrode side in the inverter circuit, in this case, the three switching elements 34 on the positive electrode side, and opens 3 on the negative electrode side. A control signal for closing each of the two switching elements 34 is output.

  When the signal from the winding short-circuit command unit 17 is input, the PWM signal generation unit 16 maintains the three switching elements 34 on the positive electrode side in an open state and maintains the three switching elements 34 on the negative electrode side in a closed state. To do.

  Then, a closed circuit is formed by the three switching elements 34 closed on the negative electrode side of the inverter circuit and the field winding of the electric motor 1. Therefore, the energy of the regenerative power due to the electromotive force generated in the field winding is consumed in each field winding while the current of the regenerative power flows through the closed circuit described above. Therefore, a braking force is applied to the electric motor 1 and the electric motor 1 is stopped in a short time.

  That is, the PWM signal generation unit 16 and the winding short-circuit command unit 17 detect the abnormality of the operation of the friction brake device 5 between the switching elements 34 on the positive electrode side and the switching elements 34 on the negative electrode side of the inverter circuit. It functions as a regenerative braking control unit that regeneratively brakes the electric motor 1 by maintaining each switching element on one pole side in a closed state and maintaining each switching element on the other pole side in an open state.

  As described above, according to the elevator control device according to the first embodiment of the present invention, even when the friction brake device 5 is abnormal, it is possible to prevent the car 3 from traveling naturally at the time of landing. be able to. Therefore, the safety of the elevator can be improved. In addition, since the dynamic brake is operated by controlling the opening and closing of each switching element 34 of the inverter circuit, the load resistance and the conductor contact that were originally required are not required, thereby reducing the manufacturing cost and reducing the size of the apparatus. Can be

(Second Embodiment)
Next, a second embodiment of the present invention will be described. In addition, description of the part same as what was shown in FIG. 1 among each elements of the elevator control apparatus which concerns on each following embodiment is abbreviate | omitted. Of the operations of the elevator control devices according to the following embodiments, the operations from the start of normal traveling to the landing are substantially the same as the operations described in the first embodiment, and thus detailed description thereof is omitted.

FIG. 4 is a diagram illustrating a configuration example of an elevator control device according to the second embodiment of the present invention.
As shown in FIG. 4, the elevator control device according to the second embodiment of the present invention replaces the brake abnormality detection unit 18 described in the first embodiment with a stop position storage unit 19 and a first self-running. A detection unit 20 is provided.

When traveling the car 3, the travel command unit 12 outputs a brake release signal and connects the second switch 46 to the current control command unit 14 side.
The travel command unit 12 also outputs a brake release signal to the first self-running detection unit 20 via the stop position storage unit 19. The first self-running detection unit 20 has a switching function of the first switch 45, and when the brake release signal from the travel command unit 12 is input, the first switch 45 is connected to the current control command unit 14 side.

  When the car 3 reaches the vicinity of the destination floor, the travel command unit 12 sends a brake signal to the friction brake device 5 and the stop position storage unit 19 to put the friction brake device 5 in a braking (brake) state for the electric motor 1. . Further, the second switch 46 is switched to the ground terminal side.

When the brake signal is input, the stop position storage unit 19 outputs the brake signal to the first self-running detection unit 20 and stores the value of the rotation angle indicated by the detection result by the rotation angle detection unit 6.
When the first self-running detection unit 20 receives the brake signal, the first self-running detection unit 20 inputs the value of the rotation angle indicated by the detection result by the rotation angle detection unit 6, and the input value and the rotation angle stored in the stop position storage unit 19. If the difference between the two is equal to or greater than a predetermined reference value, it is assumed that the car 3 has started self-running due to an abnormality in the friction brake. A stop command signal for the car 3 is output to the command unit 12 and the first switch 45 connected to the PWM signal generation unit 16 is switched from the current control command unit 14 side to the winding short-circuit command unit 17 side.
That is, the first self-running detection unit 20 functions as an abnormal running detection unit that detects an abnormal running start of the car 3 after the car 3 is landed.

  The winding short-circuit command unit 17 opens one of the three switching elements on the positive electrode side and the three switching elements on the negative electrode side in the inverter circuit, in this case, the three switching elements 34 on the positive electrode side, and opens 3 on the negative electrode side. A control signal for closing each of the two switching elements 34 is output.

  When the signal from the winding short-circuit command unit 17 is input, the PWM signal generation unit 16 maintains the three switching elements 34 on the positive electrode side in an open state and maintains the three switching elements 34 on the negative electrode side in a closed state. To do.

  Then, a closed circuit is formed by the three switching elements 34 closed on the negative electrode side of the inverter circuit and the field winding of the electric motor 1. Therefore, the energy of the regenerative power due to the electromotive force generated in the field winding is consumed in each field winding while the current of the regenerative power flows through the closed circuit described above. Therefore, a braking force is applied to the electric motor 1 and the electric motor 1 is stopped in a short time.

  As described above, according to the elevator control device according to the second embodiment of the present invention, when the car 3 starts to run after the car 3 stops, the dynamic brake is operated to You can stop running. Therefore, the safety of the elevator can be improved.

(Third embodiment)
Next, a third embodiment of the present invention will be described.
FIG. 5 is a diagram illustrating a configuration example of an elevator control device according to the third embodiment of the present invention.

  As shown in FIG. 5, the elevator control device according to the third embodiment of the present invention includes a second self-running detection unit 21 instead of the brake abnormality detection unit 18 described in the first embodiment.

When traveling the car 3, the travel command unit 12 outputs a brake release signal and connects the second switch 46 to the current control command unit 14 side.
The travel command unit 12 also outputs a brake release signal to the second self-running detection unit 21. The second self-running detection unit 21 has a switching function of the first switch 45, and when the brake release signal is input from the travel command unit 12, the first switch 45 is connected to the current control command unit 14 side.

  When the car 3 reaches the vicinity of the destination floor, the travel command unit 12 sends a brake signal to the friction brake device 5 and the second self-running detection unit 21 so that the friction brake device 5 is in a braking (brake) state with respect to the electric motor 1. And Further, the second switch 46 is switched to the ground terminal side.

  When the second self-running detection unit 21 receives a brake signal, the second self-running detection unit 21 inputs a detection result by the rotation angle detection unit 6 a plurality of times at a predetermined time interval, and based on a plurality of rotation angle values that are the detection results. Calculate the rotation speed.

The second self-running detection unit 21 determines that the car 3 starts self-running due to an abnormality in the friction brake when the calculated rotation speed value is equal to or greater than a predetermined reference value, and performs dynamic braking. In order to operate, a stop command signal for the car 3 is output to the travel command unit 12, and the first switch 45 connected to the PWM signal generation unit 16 is connected to the winding short-circuit command unit from the current control command unit 14 side. Switch to 17 side.
That is, the second self-running detection unit 21 functions as an abnormal running detection unit that detects an abnormal running start of the car 3 after the car 3 is landed.

  The winding short-circuit command unit 17 opens one of the three switching elements on the positive electrode side and the three switching elements on the negative electrode side in the inverter circuit, in this case, the three switching elements 34 on the positive electrode side, and opens 3 on the negative electrode side. A control signal for closing each of the two switching elements 34 is output.

  When the signal from the winding short-circuit command unit 17 is input, the PWM signal generation unit 16 maintains the three switching elements 34 on the positive electrode side in an open state and maintains the three switching elements 34 on the negative electrode side in a closed state. To do.

  Then, a closed circuit is formed by the three switching elements 34 closed on the negative electrode side of the inverter circuit and the field winding of the electric motor 1. Therefore, the energy of the regenerative power due to the electromotive force generated in the field winding is consumed in each field winding while the current of the regenerative power flows through the closed circuit described above. Therefore, a braking force is applied to the electric motor 1 and the electric motor 1 is stopped in a short time.

  As described above, according to the elevator control device according to the third embodiment of the present invention, after the car 3 stops, the car 3 starts to self-run based on the rotational speed of the electric motor 1. When this is considered, the self-propulsion can be stopped by operating the dynamic brake. Therefore, the safety of the elevator can be improved.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described.
FIG. 6 is a diagram illustrating a configuration example of an elevator control device according to the fourth embodiment of the present invention.

  As shown in FIG. 6, the elevator control device according to the fourth embodiment of the present invention includes an abnormal acceleration detection unit 22 instead of the brake abnormality detection unit 18 described in the first embodiment.

  The travel command unit 12 outputs a brake release signal to connect the second switch 46 to the current control command unit 14 side, for example, when the car 3 is traveled at a low speed by a control operation or the like.

  The travel command unit 12 also outputs a brake release signal to the abnormal acceleration detection unit 22. The abnormal acceleration detection unit 22 has a switching function of the first switch 45, and when the brake release signal is input from the travel command unit 12, the first switch 45 is connected to the current control command unit 14 side.

  After the first switch 45 is switched, the abnormal acceleration detection unit 22 inputs the detection result by the rotation angle detection unit 6 a plurality of times at a predetermined time interval, and based on the plurality of rotation angle values as the detection result. Calculate the rotation speed.

  The abnormal acceleration detection unit 22 operates the dynamic brake if the car 3 starts abnormal acceleration due to an abnormality of the electric motor 1 or the like when the calculated rotational speed value is equal to or greater than a predetermined reference value. For this purpose, a stop command signal for the car 3 is output to the travel command unit 12 and the first switch 45 connected to the PWM signal generation unit 16 is connected to the winding short-circuit command unit 17 from the current control command unit 14 side. Switch to the side.

  That is, when the car 3 is traveling at a predetermined speed lower than that during normal traveling, the car 3 is abnormal if the speed is equal to or higher than a predetermined reference value. It functions as an abnormal acceleration detection means for detecting that acceleration has occurred.

  The winding short-circuit command unit 17 opens one of the three switching elements on the positive electrode side and the three switching elements on the negative electrode side in the inverter circuit, in this case, the three switching elements 34 on the positive electrode side, and opens 3 on the negative electrode side. A control signal for closing each of the two switching elements 34 is output.

  When the signal from the winding short-circuit command unit 17 is input, the PWM signal generation unit 16 maintains the three switching elements 34 on the positive electrode side in an open state and maintains the three switching elements 34 on the negative electrode side in a closed state. To do.

  Then, a closed circuit is formed by the three switching elements 34 closed on the negative electrode side of the inverter circuit and the field winding of the electric motor 1. Therefore, the energy of the regenerative power due to the electromotive force generated in the field winding is consumed in each field winding while the current of the regenerative power flows through the closed circuit described above. Therefore, a braking force is applied to the electric motor 1 and the electric motor 1 is stopped in a short time.

  As described above, according to the elevator control device according to the fourth embodiment of the present invention, the car 3 is driven based on the rotational speed of the electric motor 1 while the car 3 is traveling at a low speed by a control operation or the like. When it is deemed that the engine has started abnormal acceleration, the self-propelled vehicle can be stopped by operating the dynamic brake. Therefore, the safety of the elevator can be improved.

(Fifth embodiment)
Next, a fifth embodiment of the present invention will be described.
FIG. 7 is a diagram illustrating a configuration example of an elevator control device according to the fifth embodiment of the present invention.
As shown in FIG. 7, the elevator control device according to the fifth embodiment of the present invention includes an emergency stop device 23 instead of the brake abnormality detection unit 18 described in the first embodiment.

The travel command unit 12 outputs a brake release signal to connect the first switch 45 and the second switch 46 to the current control command unit 14 side when the car 3 is traveled.
The emergency stop device 23 detects the traveling speed of the car 3, and when this speed exceeds a predetermined reference value, the emergency stop device 23 outputs a control signal indicating this to the traveling command unit 12 and The running is mechanically stopped and maintained.
That is, the emergency stop device 23 functions as an emergency brake device that mechanically brakes the movement of the car 3 in an emergency.

  Here, when the travel command unit 12 inputs a control signal from the emergency stop device 23, the emergency stop device 23 regards that the elevator 3 has been mechanically stopped, and this stop is a jump of the car 3. In order to actuate the dynamic brake for the purpose of preventing the release of the car 3, a stop command signal for the car 3 is output to the travel command unit 12, and a first signal connected to the PWM signal generating unit 16 is output. The switch 45 is switched from the current control command unit 14 side to the winding short-circuit command unit 17 side.

  The winding short-circuit command unit 17 opens one of the three switching elements on the positive electrode side and the three switching elements on the negative electrode side in the inverter circuit, in this case, the three switching elements 34 on the positive electrode side, and opens 3 on the negative electrode side. A control signal for closing each of the two switching elements 34 is output.

  When the signal from the winding short-circuit command unit 17 is input, the PWM signal generation unit 16 maintains the three switching elements 34 on the positive electrode side in an open state and maintains the three switching elements 34 on the negative electrode side in a closed state. To do.

  Then, a closed circuit is formed by the three switching elements 34 closed on the negative electrode side of the inverter circuit and the field winding of the electric motor 1. Therefore, the energy of the regenerative power due to the electromotive force generated in the field winding is consumed in each field winding while the current of the regenerative power flows through the closed circuit described above. Therefore, a braking force is applied to the electric motor 1 and the electric motor 1 is stopped in a short time.

  As described above, according to the elevator control device according to the fifth embodiment of the present invention, the car is operated by operating the dynamic brake to prevent the car 3 from being released at the time of emergency stop of the car 3. 3 self-propelled can be prevented. Therefore, the safety of the elevator can be improved.

(Sixth embodiment)
Next, a sixth embodiment of the present invention will be described.
FIG. 8 is a diagram illustrating a configuration example of an elevator control device according to the sixth embodiment of the present invention.

  As shown in FIG. 8, the elevator control device according to the sixth embodiment of the present invention includes an under-deceleration detection unit 24 instead of the brake abnormality detection unit 18 described in the first embodiment.

When traveling the car 3, the travel command unit 12 outputs a brake release signal and connects the second switch 46 to the current control command unit 14 side.
The travel command unit 12 also outputs a brake release signal to the insufficient deceleration detection unit 24. The deceleration insufficiency detecting unit 24 has a switching function of the first switch 45, and when the brake release signal is input from the travel command unit 12, the first switch 45 is connected to the current control command unit 14 side.

  The travel command unit 12 sends an emergency brake signal to the friction brake device 5 and the deceleration insufficiency detection unit 24 when the car 3 is stopped urgently so that the friction brake device 5 is in a braking (brake) state with respect to the electric motor 1. . Further, the second switch 46 is switched to the ground terminal side.

  When the brake signal is input, the under-deceleration detection unit 24 inputs the detection result by the rotation angle detection unit 6 a plurality of times at a predetermined time interval, and the rotation reduction based on the plurality of rotation angle values that are the detection result. Calculate speed. That is, the deceleration deficiency detection unit 24 functions as a deceleration detection unit that detects a deceleration of the rotation speed of the electric motor 1 during braking by the friction brake device 5.

  If the calculated deceleration value of rotation is less than a predetermined reference value, the under-deceleration detection unit 24 determines that the emergency stop of the car 3 cannot be normally performed due to an abnormality of the electric motor 1 or the like. In order to operate the brake, a stop command signal for the car 3 is output to the travel command unit 12, and the first switch 45 connected to the PWM signal generation unit 16 is short-circuited from the current control command unit 14 side. Switch to the command unit 17 side.

  The winding short-circuit command unit 17 opens one of the three switching elements on the positive electrode side and the three switching elements on the negative electrode side in the inverter circuit, in this case, the three switching elements 34 on the positive electrode side, and opens 3 on the negative electrode side. A control signal for closing each of the two switching elements 34 is output.

  When the signal from the winding short-circuit command unit 17 is input, the PWM signal generation unit 16 maintains the three switching elements 34 on the positive electrode side in an open state and maintains the three switching elements 34 on the negative electrode side in a closed state. To do.

  Then, a closed circuit is formed by the three switching elements 34 closed on the negative electrode side of the inverter circuit and the field winding of the electric motor 1. Therefore, the energy of the regenerative power due to the electromotive force generated in the field winding is consumed in each field winding while the current of the regenerative power flows through the closed circuit described above. Therefore, a braking force is applied to the electric motor 1 and the electric motor 1 is stopped in a short time.

  As described above, according to the elevator control device according to the sixth embodiment of the present invention, when the car 3 is emergency stopped, the emergency stop of the car 3 is performed based on the rotational deceleration of the electric motor 1. When it is considered that the vehicle cannot be operated normally, the self-propelled vehicle can be stopped by operating the dynamic brake. Therefore, the safety of the elevator can be improved.

  In each of the embodiments described above, the dynamic brake having the configuration shown in FIG. 1 has been described as an example. However, the dynamic brake having the configuration shown in FIG. 2 may be used. In this case, for example, the brake abnormality detection unit 18 described in the first embodiment outputs a dynamic brake braking command signal to the conductor contacts 31 and 32 when the brake abnormality is detected, and the conductor contact 31 causes the three-phase winding of the electric motor 1 to be performed. The dynamic brake may be operated by disconnecting each switching element 34 from the line and connecting the three-phase winding of the electric motor 1 to the load resistor 30 by the conductor contact 32.

  The present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be omitted from all the components shown in the embodiment. Furthermore, you may combine suitably the component covering different embodiment.

The figure which shows the structural example of the dynamic brake of the elevator control apparatus according to the 1st Embodiment of this invention. The figure which shows the structural example of the dynamic brake of the conventional elevator control apparatus. The figure which shows the structural example of the elevator control apparatus according to the 1st Embodiment of this invention. The figure which shows the structural example of the elevator control apparatus according to the 2nd Embodiment of this invention. The figure which shows the structural example of the elevator control apparatus according to the 3rd Embodiment of this invention. The figure which shows the structural example of the elevator control apparatus according to the 4th Embodiment of this invention. The figure which shows the structural example of the elevator control apparatus according to the 5th Embodiment of this invention. The figure which shows the structural example of the elevator control apparatus according to the 6th Embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Electric motor, 2 ... Rope, 3 ... Car, 4 ... Counterweight, 5 ... Friction brake device, 6 ... Rotation angle detection part, 7 ... Inverter energization element, 8 ... Braking resistance, 9 ... Braking resistance energization element, 10 DESCRIPTION OF SYMBOLS ... Capacitor, 11 ... Rectification circuit, 12 ... Running command part, 13 ... Speed control command part, 14 ... Current control command part, 15 ... Current detection part, 16 ... PWM signal generation part, 17 ... Winding short circuit command part, 18 ... Brake abnormality detection unit, 19 ... Stop position storage unit, 20 ... First self-running detection unit, 21 ... Second self-running detection unit, 22 ... Abnormal acceleration detection unit, 23 ... Elevator emergency stop unit, 24 ... Detection of insufficient deceleration , 30 ... Braking impedance, 31 and 32 ... Winding short-circuit conductor, 33 ... Diode, 34 ... Switching element, 41 ... Main sheave, 42, 43 ... Secondary sheave, 44 ... Ceiling, 45 ... First switch, 46 ... First 2 switches.

Claims (1)

A rectifier circuit that converts AC power from an AC power source into DC power;
A smoothing capacitor for smoothing pulsation of DC power converted by the rectifier circuit;
An inverter that bridges and connects a parallel circuit of a diode and a switching element, converts the smoothed DC power into AC power of variable voltage and variable frequency, and outputs it;
An electric motor driven by AC power output from the inverter to raise and lower the car;
Traveling control means for performing energization cutoff control of each switching element of the inverter so that AC power of the variable voltage and variable frequency is output according to a predetermined operation pattern;
An emergency braking device for mechanically braking the movement of the car in an emergency;
When the movement of the car is stopped by the emergency brake device, each switching element on one of the positive electrode side and each switching element on the negative electrode side of the inverter is kept closed. And an regenerative braking control unit that regeneratively brakes the electric motor by maintaining each switching element on the other pole side in an open state.

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