JP3521861B2 - Elevator control device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevator control device.

[0002]

2. Description of the Related Art FIG. 9 shows, for example, Mitsubishi Electric Technical Report VOL. 6
It is a block diagram of the conventional elevator control apparatus shown by 7, No. 10, P28-32, 1993, in the figure, 1 is a 3-phase alternating current power supply, 2 is a line filter, 4 is PW.
M control converter, 3 reactor for limiting current of 4 PWM control converter, 5 smoothing capacitor, 6 PWM control inverter, 7 reactor on output side of 6 PWM control inverter, 8 PWM inverter Induction motor powered by, 9 is directly connected to induction motor 8
It is a hoist that drives 11 cages and 12 counterweights via 0 ropes. 13 is a transformer for stepping down the 3-phase AC power supply 1, 14 is a phase detection circuit for detecting the phase of the 3-phase AC power supply 1, 17 is a PWM control converter 4 based on the outputs of the current detector 15 and the voltage detector 16 A converter control circuit that generates a PWM signal to be controlled, and 18 is a gate drive circuit that amplifies the PWM signal from the converter control circuit 17. 19 is a PWM control inverter 6
Current detector for detecting the current from the motor, 20 is the induction motor 8
A pulse generator for detecting the speed of the
An inverter control circuit that generates a control signal for the PWM control inverter 6 based on the output signal of the pulse generator 20 and a speed command generated by the controller 22. Reference numeral 23 is a gate drive that amplifies the PWM control signal from the inverter control circuit 21. The circuit 23.

Next, the operation will be described. The three-phase AC power supply 1 is stepped down by the transformer 13, and the phase of the three-phase AC power supply 1 is detected by the 14 phase detection circuit. Next, the converter control circuit 17 outputs the output of the current detector 15 and the voltage detector 1
The PWM control converter 4 with the output of 6 as a feedback signal
The PWM signal is generated so that the output voltage is a constant value and the phase of the input current is the same as the phase of the power supply voltage. This PW
The M signal is amplified by the gate drive circuit 18, and PWM
It becomes the gate signal of the control element of the control converter 4, and drives the gate of the transistor of the converter 4 to operate the converter 4. Next, the inverter control circuit 21
The output of the current detector 19 and the output of the pulse generator 20 that is directly connected to the induction motor 8 and detects the speed of the induction motor 8 are used as feedback signals, and the induction motor 8 is generated according to the speed command generated by the controller 22. To control the speed of
A control signal for the PWM control inverter 6 is generated. PWM
The control signal is amplified by the gate drive circuit 23, and the PW
It becomes the gate signal of the control element of the M control inverter 6, and drives the gate of the transistor of the converter 4 to operate the converter 4.

The above conventional elevator control device is
Since an induction motor was used as the hoisting motor, the dynamic brake did not work during an emergency stop, and a strong electromagnetic brake was required to shorten the stop distance during an emergency stop.

Next, another embodiment for solving the above-mentioned problems of the conventional example will be described with reference to the drawings. Figure 10
FIG. 3 is a block diagram showing a configuration of an elevator control device. In the figure, the same parts as those shown in FIG. 9 are designated by the same reference numerals and the description thereof will be omitted. 4 is a synchronous motor, 25 is an angle detector for detecting the rotation angle of the synchronous motor, and 26 is an inverter control circuit.

Next, the operation will be described. The PWM control converter 4 performs the same control as the conventional example of FIG.
The inverter control circuit 26 uses, as feedback signals, the output of the current detector 19 and the output of the pulse generator 20 that is directly connected to the synchronous motor 24 to detect the speed of the motor and the output of the angle detector 25 to detect the rotation angle. , 22 to generate a PWM signal so as to control the speed of the synchronous motor 24 according to a speed command generated from the controller, and output the PWM signal to the gate drive circuit 23. The gate drive circuit 23 amplifies the PWM signal, gives a gate signal to the control element of the PWM control inverter 6, and operates the PWM control inverter 6.

Next, the calculation method of the inverter control circuit 26 will be described. FIG. 11 shows the inverter control circuit 2 of FIG.
6 is a block diagram showing a basic calculation method of 6, wherein 27 is an input current i of the synchronous motor 24 detected by the current detector 19.
_u , _iv , and i _w are the q-axis component current i _q and the d-axis component current i _d
Coordinate conversion means for converting into and, 28 is a d-axis current command value i _d ^*
And a subtractor for calculating a deviation between the d-axis current i _d , 29 is a d-axis calculating means for calculating the d-axis voltage command V _d ′,
Reference numeral 30 denotes an impedance calculator that calculates the product of the output of the speed detector 20 and the synchronous reactance, and 31 calculates the product of the output of the impedance calculator 30 and the q-axis current i _q to calculate the interference voltage ωL _s i _q . A multiplier 32 for subtracting the interference voltage ωL _s i _q from the voltage command V _d 'calculator 29, and d
It is a subtractor that calculates the axis voltage command V _d ^* .

Reference numeral 33 is a subtractor for producing a deviation between the output of the speed detector 20 and the speed command from the controller 22, 34
Compares the output of the subtractor 33 and calculates the q-axis current command i _q ^*
Is a calculator for calculating the difference between the q-axis current command value i _q ^* and the q-axis current i _q , and 36 is a q-axis voltage command V _q for performing proportional integral calculation of the output of the subtractor 35. A computing unit, which is a q-axis computing means for computing ', computes the product of the output of the impedance computing unit 30 and the d-axis current component i _d, and d
Multiplier for calculating an interference voltage .omega.L _s i _d generated by the axial current component i _d, 38 may calculate a q-axis voltage command V _q ^* by adding the interference voltage .omega.L _s i _d to the voltage command V _q 'of q-axis An adder 39 for controlling the d-axis voltage command value V _d ^* and the q-axis voltage command value V _q ^*
Voltage command value of three-phase ^{_{V u *, V v *,}} V w * coordinate conversion means for converting the 40 voltage command value ^{_{V u *, V v *,}} PWM generation circuit for converting the V _w ^* to the PWM signal Is.

Next, the operation of the inverter control circuit 26 will be described. The control calculation of the synchronous motor 24 is performed on a rotating coordinate system that is synchronized with the rotation angle of the rotor. Here, the in-phase component and the orthogonal component of the magnetic flux of the permanent magnet are controlled so as to coincide with the q-axis. Input current i _u of the synchronous motor 24 detected by the current detector 19, i _v, i _w is the rotation angle detector 2
Based on the rotation angle of the electric motor detected by 5, the coordinate conversion means 27 causes the q-axis component current i _q and the d-axis component current i.
Converted to _d and. Next, the deviation between the d-axis current command value i _d ^* and the d-axis current i _d from the ROM data (not shown) built in the inverter control circuit 26 is calculated by the subtractor 28, and the arithmetic unit 29 is used. Generates a d-axis voltage command V _d '.
Next, the impedance calculator 30 calculates the product of the output of the speed detector 20 and the synchronous reactance. Since the impedance changes with the speed, it is calculated in this way. The multiplier 31 further calculates the product of the q-axis current i _q and the interference voltage ωL _s generated by the q-axis current component i _q .
Calculate i _q . In the subtractor 32, the above-mentioned d-axis voltage command V
_The interference voltage ωL _s i _q is subtracted from d'and the d-axis voltage command V
generates _d ^* . Thus, the d-axis voltage command V _d ^* increases the amount by which the magnetic flux decreases due to interference.

Similarly, the subtracter 3 calculates the deviation between the output of the speed detector 20 and the speed command 22a generated by the controller 22.
3 and the deviation is compared and calculated by 34 calculators, and q
An axis current command i _q ^* is generated. This q-axis current command value i _q ^*
And the q-axis current i _q is calculated by a subtractor 35, and a proportional-integral calculation is performed by a computing unit 36 to generate a q-axis voltage command V _q ′. Next, the impedance calculator 30 calculates the product of the output of the speed detector 20 and the synchronous reactance, and the multiplier 3
Further calculates the product of the d-axis current i _d 7, calculates the interference voltage .omega.L _s i _d generated by the d-axis current component i _d.
In the adder 38, the interference voltage ω is added to the q-axis voltage command V _q ′.
L _s i _d is added to generate the q-axis voltage command V _q ^* . The d-axis voltage command value V _d ^* and the q-axis voltage command value V _q ^* are three-phase voltage commands by the coordinate conversion means 39 based on the rotation angle of the synchronous motor 24 detected by the rotation angle detector 25. Value V
_u ^*, V _v ^*, to generate a V _w ^*. In the PWM signal generation circuit 40, the voltage command values V _u ^* , V _v ^* , V _w ^* are converted into PWM signals and output to the gate tribe circuit 23, and the inverter 6
Control the output voltage of.

[0011]

The conventional elevator control device requires a strong electromagnetic brake in order to shorten the stopping distance at the time of emergency stop because the dynamic brake at the time of emergency stop does not work, but the energy consumption of the elevator is reduced. There is also a social demand for further reduction.

When a synchronous motor is used, as shown in FIG.
In the calculation method of the inverter control circuit 26 shown in (1), the magnetic flux density of the permanent magnets of the synchronous motor 24 varies and is attenuated over time. Therefore, if the magnetic flux density is lower than a predetermined value, the torque of the synchronous motor decreases. There is a problem that the elevator cannot be accelerated sufficiently. On the contrary, if the magnetic flux density is higher than the predetermined value, the input voltage of the synchronous motor 24 during high-speed rotation becomes too high, and the output voltage of the inverter 6 is saturated, and the synchronous motor 24 cannot output the rated speed. To do.

The present invention has been made to solve the above problems, and can sufficiently accelerate the elevator even if the magnetic flux density of the permanent magnets of the synchronous motor is attenuated, and the rated rotation speed can be increased. It is an object of the present invention to obtain an elevator control device that can output power, can operate a dynamic brake to reduce the size of an electromagnetic brake, and can further reduce energy consumption as compared with a conventional elevator control device.

[0014]

Further, an input current of a synchronous motor using a permanent magnet as a field is detected, and the detected current is orthogonal to a component having the same phase as the magnetic flux of the permanent magnet and a component having the same phase. In an elevator control device that is driven by an inverter that converts and controls the input voltage calculation unit, an input voltage calculation unit that calculates an input voltage of the synchronous motor while the elevator is traveling, and an output of the input voltage calculation unit to a predetermined value. When the input voltage is smaller than a predetermined value by the comparison means for comparing with the comparison means, after the elevator is stopped, a current of a component in the same phase as the magnetic flux of the permanent magnet is passed to magnetize the permanent magnet. And a magnetizing means.

Further, an input current of a synchronous motor using a permanent magnet as a field is detected, and the detected current is converted into a component in phase with the magnetic flux of the permanent magnet and a component orthogonal to this in-phase component. In an elevator control device driven by an inverter controlled by a power source, a power source abnormality detecting means for detecting a power source abnormality, a rescue floor detecting means for detecting a rescue floor of a car stopped due to a power source abnormality, and the power source abnormality detection Means for short-circuiting the input terminal of the synchronous motor when the abnormality of the power source is detected by means, and the hoisting machine when the input terminal of the synchronous motor is short-circuited by the short-circuiting means and a start command is issued. And a brake control unit that operates the brake according to the output of the rescue floor detection unit when the car arrives at the rescue floor.

[0016]

In the elevator control apparatus according to the present invention, the input voltage calculation means calculates the input voltage of the synchronous motor while the elevator is traveling, and the comparison means compares the output of the input voltage calculation means with a predetermined value. When the input voltage is smaller than a predetermined value, the magnetizing means magnetizes the permanent magnet by flowing a current having a component in the same phase as the magnetic flux of the permanent magnet after the elevator is stopped.

The brake control means short-circuits the input terminal of the synchronous motor by the short-circuiting means when the power supply abnormality detecting means detects the power supply abnormality, and releases the brake of the hoisting machine when the start command is detected. Then, the car is run, and when the car arrives at the rescue floor, the rescue floor detecting means operates the brake.

[0018]

EXAMPLES Example 1. An embodiment of the present invention will be described below with reference to the drawings. Figure 1
FIG. 3 is a block diagram showing the configuration of an inverter control circuit of an elevator control device. In the figure, reference numeral 41 is a determination circuit for determining whether or not the synchronous motor 24 is rotating at constant speed from the output of the speed detector 20, and 42 is the synchronous motor 24 being rotated at constant speed.
Is an arithmetic unit for calculating the input voltage of V, and 43 is a q-axis voltage command value V
a subtractor for calculating the deviation between q ′ and the output of the calculator 42, 44
When the synchronous motor 24 is rotating at a constant speed, the output of the subtractor 43 is subjected to a filter calculation and a proportional calculation, and the output is output. A storage circuit that outputs a value, 45 is an output circuit that outputs a d-axis current command according to the output of the storage circuit 44, and 46 is a subtraction that subtracts the output of the output circuit 45 from the d-axis component current command i _d0 * and outputs it to 28. It is a vessel.

Next, the operation will be described. Judgment circuit 41
Determines from the output of the speed detector 20 whether or not the synchronous motor 24 is rotating at a constant speed, and outputs it to the storage circuit 44. The calculator 42 calculates the input voltage of the synchronous motor 24 during constant speed rotation. When the input voltage is Vm, it is expressed as Vm = (voltage drop due to winding resistance) + (back electromotive force), but the voltage drop due to the resistance of the stator winding is sufficiently smaller than the back electromotive force, so it is ignored. And calculate. Vm = pλω where p ... Number of pole pairs λ ... Magnetic flux density ω ... Angular velocity of electric motor As described above, the input voltage Vm is equal to the counter electromotive force of the synchronous electric motor. Further, although the input voltage of the synchronous motor 24 during constant speed traveling is an estimated value, the actual input voltage is equivalently obtained from the output V _q ′ of the computing unit 36. If the magnetic flux density of the permanent magnets of the synchronous motor 24 is smaller than a predetermined value, V _q '<Vm
And conversely, if the magnetic flux density is larger than a predetermined value, V _q '>
It becomes Vm.

Next, the subtractor 43 calculates the deviation between the voltage command value V _q 'and the output Vm of the calculator 42, and outputs it to the memory circuit 44. In the storage circuit 44, while the synchronous motor is rotating at a constant speed by the output of the determination circuit 41, the deviation of the subtractor 43 is subjected to filter calculation and proportional calculation and output to the output circuit 45. When the output of the memory circuit 44 is negative, the output circuit 45 determines that the magnetic flux of the permanent magnet is larger than a predetermined value and outputs the d-axis current command, and the subtractor 46 outputs the d-axis component current command value i _d0. The output of the output circuit 45 is subtracted from * to obtain the current command value i for the d-axis component
_{The d} * is output to the subtractor 28. This current command value i _d0 *
Are stored in ROM data (not shown) built in the inverter control circuit 26. In the subtractor 28, d
The deviation between the current command value i _d0 * of the axis component and the current command value i _d is calculated. While the synchronous motor 24 is accelerating and decelerating, since the speed is changing and an accurate magnetic flux of the magnet cannot be obtained, the output of the calculator 42 during constant speed rotation is stored and the value is output to 46. By thus controlling the magnetic flux density of the synchronous motor 24 to a predetermined value, it is possible to automatically prevent the output voltage of the inverter 6 from being saturated, and the synchronous motor can perform the rated rotation.

By the way, in the inverter control circuit shown in FIG. 1, since a negative d-axis component current may transiently flow when the load torque changes suddenly (when i _d > _id ^* ), the d-axis component It is necessary to preset the current command i _d0 ^* to a predetermined positive value to prevent demagnetization of the permanent magnet. Next, the inverter control circuit when the permanent magnets of the synchronous motor 24 are demagnetized will be described. 2 is a diagram in which 47 is added to FIG. 1, and 47 is a comparator for determining whether the output of the memory circuit 44 is positive or negative and comparing whether or not demagnetization is occurring.

Next, the operation will be described. First, the subtractor 43 of FIG. 2 calculates the deviation between the voltage command value V _q ′ and the output Vm of the calculator 42, and outputs it to the storage circuit 44. In the storage circuit 44, while the synchronous motor is rotating at a constant speed by the output of the determination circuit 41, the deviation of the subtractor 43 is subjected to filter calculation and proportional calculation, and the value is output to the comparator 47.

The next operation will be described with reference to the flowchart of FIG. In the figure, in step S50, the comparator 47 determines whether the output of the memory circuit 44 is positive or negative. When the output is negative, demagnetization has not occurred, so the calculation ends. When the output of the memory circuit 44 is positive, it is considered that the demagnetization of the permanent magnet has occurred, and the process proceeds to step S51 and is compared with a predetermined value in step S51. When the output of the memory circuit 44 is smaller than the predetermined value, the process proceeds to step S52, and in step S52, the elevator is allowed to run as it is by the magnetizing means and stopped at the target floor, and then the d-axis current component is passed to magnetize the permanent magnet. When the output of the memory circuit 44 is larger than the predetermined value, step S5
In step S53, the elevator is run to the nearest floor by the restart inhibiting means to disable restart. With the above configuration, when demagnetization occurs, it can be recovered,
Further, even if the permanent magnet is demagnetized, the elevator can be stopped safely.

Example 2. In the first embodiment, the back electromotive force of the synchronous motor 24 is detected and fed back, so that the synchronous motor 24 is automatically operated.
The input voltage of the synchronous motor 24 is provided while the synchronous motor is in operation while the current setting means 48 for manually inputting the command value of the d-axis current component is provided as shown in FIG. It is also possible to control the input voltage of the synchronous motor to a predetermined value by measuring the current, and flowing a current component in the same phase as the permanent magnet so as to increase the magnetic flux of the same phase as the permanent magnet of the synchronous motor. With the above configuration, it is possible to prevent the permanent magnet from being demagnetized, and the synchronous motor can perform rated rotation.

Example 3. In the conventional elevator control device shown in FIG. 9, an induction motor is used as the hoisting motor, and even if a failure occurs while the elevator door is open, the dynamic brake cannot be activated. There is a problem that the speed of the car increases before the electromagnetic brake is activated due to the load imbalance. Therefore, a strong electromagnetic brake was needed to stop the car as close to the floor level as possible. When a synchronous motor using a permanent magnet as a field is applied as the hoisting motor, a voltage is generated by the following equation as described above while the synchronous motor is rotating. Vm = pλω Therefore, when the input terminal of the synchronous motor is short-circuited or directly short-circuited via a resistor, the current of the following formula flows and the dynamic brake can be activated. im = Vm / ((ωL _s ) ² + R _a ² ) ^1/2 where, L _s ··· Synchronous reactance R _a ··· Sum of fixed winding resistance and external short-circuit resistance

This embodiment is an embodiment of the above, and the drawings will be described. FIG. 5 is a block diagram of an elevator control device. In the figure, 60 is a contactor of a contactor that short-circuits the input terminals of the synchronous motor 24, and 61 is the controller 2.
2 is a coil of a contactor controlled by 2, and the same or corresponding parts as in FIG. Figure 6
FIG. 4 shows the sequence calculation of the controller 22 by an equivalent relay connection diagram. In the figure, 65 is a switch contactor that detects opening and closing of the elevator door, 66 is a coil that is excited when the elevator door is closed, and 67 is a break contactor for the coil 66 that is closed when the elevator door is open. It is a contactor. 68 is a contactor which is closed when the safety circuit operates and an emergency stop is applied.
Is a coil that is excited and opened when an emergency stop is applied while the door is open.

Next, the operation will be described. The safety circuit operates in a state where passengers can get on and off while the elevator is open, and when an emergency stop is applied, the contactor 68 closes and the coil 6
Since 1a is excited, the controller 22 excites the coil 61 of the contactor, the contactor 60 is closed, the input of the synchronous motor 24 is short-circuited via the resistor 62, and the dynamic brake works effectively. Therefore, it is possible to prevent the speed of the car from increasing due to the imbalance between the car and the counterweight until the electromagnetic brake (not shown) is activated, and the torque of the electromagnetic brake can be reduced. . Further, in FIG. 4, the torque of the dynamic brake is controlled by connecting the input terminal of the synchronous motor 24 to the contactor in series with the resistor 62 to short-circuit and limit the current. However, when the dynamic brake is too small, , You may lose resistance.

Example 4. Next, a fourth embodiment will be described with reference to the drawings. FIG. 7 shows an elevator control device. In the figure, 70 is a power supply transformer for the controller 22, 71 is a stabilized power supply, 72 is a relay for detecting whether or not the three-phase AC power supply 1 is normal, and 73 and 74.
Is a break contactor of the relay 72, 75 is a battery that supplies current to the controller 22 at the time of power failure, 77 is an electromagnetic brake of the hoisting machine 9, and 76 is a coil of the electromagnetic brake. The same or corresponding parts as those in FIG. 9 are designated by the same reference numerals and the description thereof will be omitted.

Next, the operation of the circuit will be described with reference to the sequence diagram of FIG. FIG. 8 shows the sequence calculation of the controller 22 in an equivalent relay connection diagram. When the three-phase AC power supply 1 is lost, the voltage on the secondary side of the power transformer 70 also disappears, and the power supply abnormality detection relay 72 is deenergized. Contactor 73
Is closed and power is supplied from the battery 75 to the controller 22. At the same time, the contactor 74 is also closed.
The auxiliary contactor 74a is closed and the coil 61a is excited,
The controller 22 excites the coil 61 of the contactor. When the coil 61 is excited, the contactor 60 is closed and the input of the synchronous motor 24 is short-circuited via the resistor 62.
When the contactor 60 is closed, the auxiliary contactor 60a is also closed.

Eventually, when a start command is issued, the contactor 78 is closed and the contactor 79 of the relay for detecting the rescue floor is also closed, so the coil 76a is excited and the electromagnetic brake 77 is opened. At this time, the car is accelerated due to the weight imbalance between the car and the counterweight, and the synchronous motor 24 starts to rotate. When the synchronous motor rotates, electromotive force is generated, and a current flows and the car runs at a speed at which the torque generated by the synchronous motor and the unbalanced torque are balanced. When the car arrives at the rescue floor, the contactor 79 is opened, the coil 76a is deenergized, and the electromagnetic brake is activated to stop the car. With the above configuration, in the event of a power failure, the input of the synchronous motor is short-circuited by the contactor, the electromagnetic brake is released, and the elevator can travel to the rescue floor at a low speed to rescue passengers.

[0031]

As described above, according to the present invention, the input current of a synchronous motor using a permanent magnet for the field is detected, and this detected current is detected as a component having the same phase as the magnetic flux of the permanent magnet. In an elevator control device driven by an inverter that converts and controls a phase component and a component orthogonal to each other, an input voltage calculation means for calculating an input voltage of the synchronous motor while the elevator is running, and the input voltage calculation means. And a comparing means for comparing the output of the permanent magnet with a predetermined value, and when the input voltage is smaller than the predetermined value by the comparing means, a current having a component in the same phase as the magnetic flux of the permanent magnet is caused to flow after the elevator is stopped, Since it is provided with a magnetizing means for magnetizing, it is possible to recover when demagnetization occurs.

Further, an input current of a synchronous motor using a permanent magnet as a field is detected, and the detected current is converted into a component having the same phase as the magnetic flux of the permanent magnet and a component orthogonal to the same phase component. In an elevator control device driven by an inverter controlled by a power source, a power source abnormality detecting means for detecting a power source abnormality, a rescue floor detecting means for detecting a rescue floor of a car stopped due to a power source abnormality, and the power source abnormality detection Means for short-circuiting the input terminal of the synchronous motor when the abnormality of the power source is detected by means, and the hoisting machine when the input terminal of the synchronous motor is short-circuited by the short-circuiting means and a start command is issued. Since the car has reached the rescue floor and the car has run with the brake released, the brake control means for operating the brake by the output of the rescue floor detection means is provided. Can be at the time of abnormality to rescue the passengers to travel elevator to rescue floor at a low speed by releasing the electromagnetic brake shorted input of the synchronous motor by the contactor.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an elevator control device showing an embodiment of the present invention.

FIG. 2 is a configuration diagram of an elevator control device showing another embodiment of the present invention.

FIG. 3 is a flowchart of the operation of the elevator showing another embodiment of the present invention.

FIG. 4 is a block diagram of an elevator controller according to another embodiment of the present invention.

FIG. 5 is a configuration diagram of an elevator control device according to another embodiment of the present invention.

6 is a sequence diagram showing an operation of the controller of FIG.

FIG. 7 is a configuration diagram of an elevator control device according to another embodiment of the present invention.

FIG. 8 is a sequence diagram showing an operation of the controller of FIG.

FIG. 9 is a configuration diagram of a conventional elevator control device.

FIG. 10 is a configuration diagram of a conventional elevator control device.

11 is a block diagram showing a calculation method of the inverter control circuit of FIG.

[Explanation of symbols]

19 current detection circuit, 24 synchronous motor, 26 inverter, 29 arithmetic unit, 41 determination circuit, 42 arithmetic unit, 4
3 subtractor, 44 memory circuit, 45 output circuit, 46
Subtractor, 47 comparator, 48 current setting device, 62 resistance, 60 contactor, 72 detection relay, 77 electromagnetic brake.

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields investigated (Int.Cl. ⁷ , DB name) B66B 1/00-11/08 H02P 5/408-5/412 H02P 6/00-6/24 H02P 7 / 628-7/632 H02P 21/00

Claims (2)

(57) [Claims] 1. An input current of a synchronous motor using a permanent magnet as a field is detected, and the detected current is converted into a component in phase with the magnetic flux of the permanent magnet and a component orthogonal to this in-phase component. In an elevator control device driven by an inverter controlled by: an input voltage calculation means for calculating an input voltage of the synchronous motor while the elevator is running; and a comparison means for comparing the output of the input voltage calculation means with a predetermined value. When the input voltage is smaller than a predetermined value by the comparison means, after the elevator is stopped, a current having a component of the same phase as the magnetic flux of the permanent magnet is caused to flow to magnetize the permanent magnet. An elevator control device characterized by the above. 2. An input current of a synchronous motor using a permanent magnet as a field is detected, and the detected current is converted into a component in phase with the magnetic flux of the permanent magnet and a component orthogonal to this in-phase component. In an elevator control device driven by an inverter controlled by a power source, a power source abnormality detecting means for detecting a power source abnormality, a rescue floor detecting means for detecting a rescue floor of a car stopped due to the power source abnormality, and the power source abnormality detection Means for short-circuiting the input terminal of the synchronous motor when an abnormality of the power source is detected by means, and a hoist when the input terminal of the synchronous motor is short-circuited by the short-circuit means and a start command is issued. Brake control means for releasing the brake of the car to run the car, arriving at the car at the rescue floor, and operating the brake according to the output of the rescue floor detection means. Control device for an elevator to be.