WO2004001952A1 - Elevator control device - Google Patents

Abstract

Individual current control units are provided to respective motor winding systems of a multi-winding motor that constitutes a hoisting machine (6) for lifting/lowering a cage (8) to give the same torque instruction, and θa and θb obtained by respectively adding magnetic pole adjustment elements (θadja, θadjb) to an output (θ) from a rotation detector (10) are given to a 3-phase/2-phase converter and a 2-phase/3-phase converter to thereby control a q-axis current uniformly and control a magnetic flux in each system to be equal, whereby it is possible to improve a current imbalance between motor winding systems.

Description

 Specification

 Elevator control system

 The present invention relates to a control device for an elevator, and more particularly to a control for a large-capacity elevator that drives a hoist constituted by a multi-winding motor by connecting a plurality of inverters and converters. Equipment related. Background art

 The drive unit of a large-capacity ultra-high-speed elevator and a double-deck elevator connected with an upper car and a lower car controls the motor with a plurality of impellers and converters.

 In recent years, buildings are becoming higher and higher, and ultra-high-speed elevators for mass transport of passengers and double-deck elevators for transporting two passengers at a time are used. A multi-winding motor with a large capacity is used as the motor for driving such an elevator.

The control device that performs the control has a configuration in which a plurality of inverter devices and converter devices are connected to control the module. For example, Fig. 1 shows a conventional system example. As shown in the figure, a converter 102 a and a converter 102 are connected in parallel to a power source 101. Inverter 103a is connected to converter 102a, and capacitor 104a is connected between converter 102a and inverter 103a. Connect inverter 103b to converter 102b and connect capacitor 104b between converter 102b and inverter 103b. Assuming that the motor of the hoisting machine 106 is, for example, a two-winding motor, an inverter 103 a is connected to the winding A, and an inverter 103 b is connected to the winding B. The car 108 is connected to the counterweight 107 by a main rope 109, and the main rope 109 is mounted on a hoist 106 so that the car 108 can move up and down.

 As a control configuration, for example, a control means 105a is connected to the inverter 103a and the inverter 103b, and controls the inverter 103a. The control means 105b is connected to the converter 102a and the converter 102b, and controls the converter.

 A rotation detector (rotation sensor) 110 is connected to the motor shaft of the hoisting machine 106, and the output thereof can be input to the control means 105a. The operation control of the elevator is performed by the control means 105a. The speed control unit calculates a torque command Tm from the elevator speed command ω * and the speed feedback from the rotation sensor 110, and gives a half current command to the A-system and B-system current control units.

 A current detector 112c and a current detector 112d are connected to the output side of the receiver 103a and the output side of the receiver 103b, so that the output can be input to the control means 105a. ing. Feedback currents are given to the A and B current control units, and voltage commands Vda *, Vqa \ Vdb \ Vqb * are output. Each voltage command is given to the PWM control section, and the gate signals GATE-A and GATE-B are output to the inverter 103a and the inverter 103b, respectively, to control the two-winding motor of the hoist 106. I do.

However, such an elevator controller has the following problems. Unbalanced output voltage due to imbalance and manufacturing accuracy between A and B windings of motor of hoist 106, and variations in switching operation of elements 103a and 103b, resulting in current in A and B systems. It becomes unbalanced. Since there is only one rotation detector 110 to detect the magnetic pole position of the motor, depending on the structure of the motor, for example, it has a structure in which A-system and B-system windings are respectively installed on the left and right of the sheave If A Since the magnetic pole position is different between the system and the B system, the magnetic pole position must be adjusted individually for the A and B systems. If adjustment is not possible, the output current will be unbalanced. In such a case, for example, if the output of the A system impeller was output as commanded, but the current of the B system was not enough, the control circuit would correct the current to flow to the B system. It works like it does. Attempting to flow through the B-system will result in torque ripple due to the deviation from the current required for the A-system. If the current cannot be output sufficiently, the torque command itself fluctuates. Such a state is repeated, and longitudinal vibration is generated, so that riding comfort is deteriorated.

 Also, if the structure of the module is such that the A-system and B-system windings are respectively built in the left and right sides of the sieve, the A-system and B-system current imbalances Vibration is generated because the vibration is deviated from side to side, which may affect the ride comfort and mechanical failure such as damage to the motor rotation shaft bearing.

 The present invention has been made to solve the above-described problems, and in order to improve the efficiency reduction due to current imbalance when a multi-winding motor is driven by a plurality of inverters, to suppress vibration, An object of the present invention is to provide a control device for an elevator that can improve ride comfort. Disclosure of the invention

In order to achieve the above object, an elevator control device according to the present invention includes a hoisting machine configured by a multi-winding motor that raises and lowers an elevator, and a plurality of motors for driving the multi-winding motor. An elevator comprising an inverting device and a compensating device, a rotation detecting means for detecting a rotational position of a shaft of the multi-winding motor, and a control means for controlling the inverting device and the compensating device. In the evening control device, individual current control means is provided for each motor winding system, and the q-axis current is controlled uniformly and the magnetic flux is controlled uniformly in each system. According to the present invention, each motor winding system is provided with a separate current control means for each motor winding system, gives the same torque command, uniformly controls the Q-axis current, and makes the magnetic flux uniform in each system. The current imbalance of the vehicle can be improved to prevent the elevator from stopping abnormally due to the reduced efficiency of the inverter, and the riding comfort due to vibration can be improved.

 In order to further achieve the above object, an elevator control apparatus according to the present invention includes a hoist comprising a multi-winding motor for raising and lowering the elevator, and a plurality of inverters for driving the multi-winding motor. Elevator control device comprising: a device and a converter device; a rotation detecting means for detecting a rotational position of a shaft of a multi-winding motor; and a control means for controlling an inverter device and a converter device. In this method, the magnetic pole position of each system is estimated from the armature inductance, and the magnetic pole position is corrected so as to match one of the systems.

 According to the present invention, the magnetic pole position of each system is estimated from the armature inductance, and the magnetic pole position is corrected so that both responses match, thereby improving the current imbalance of each motor winding system. This can prevent abnormal stoppage in the evening due to lower efficiency in the evening, and improve the riding comfort due to vibration. In order to further achieve the above object, an elevator control device according to the present invention includes a hoist comprising a multi-winding motor for raising and lowering the elevator, and a plurality of inverters for driving the multi-winding motor. A control device for controlling the rotation of the shaft of the multi-winding motor, and a control device for controlling the inverter device and the converter device. The feature is that the magnetic flux in the magnetic flux direction of the permanent magnet is adjusted by the shaft current, and the voltage in each winding system is controlled uniformly, so that the current in each system is controlled uniformly.

According to the present invention, the magnetic flux in the magnetic flux direction of the permanent magnet is adjusted by the d-axis current, the magnetic flux in each winding system is adjusted, and the voltage is controlled uniformly, so that the current in each system is evenly controlled. By controlling it, it is possible to prevent abnormal stoppage of the elevator due to a decrease in efficiency of the room, and to improve the riding comfort due to vibration.

 In order to further achieve the above object, an elevator control apparatus according to the present invention includes a hoist comprising a multi-winding motor for raising and lowering the elevator and a multi-winding motor. An elevator comprising: a plurality of impeller devices and a converter device; rotation detecting means for detecting a rotational position of a shaft of a multi-winding motor; and control means for controlling the inverter device and the combiner device. The feature of the evening control system is that during low-speed operation, the armature current flows so that the magnetic flux is generated in a direction that cancels out the magnetic flux in each system in order to obtain the required magnetic flux.

 According to the present invention, at the time of low-speed operation, in order to obtain a required magnetic flux, an armature current is caused to flow in a direction in which the magnetic flux is canceled in each system, so that a current that is not affected by dead time can flow. As a result, it is possible to improve the riding comfort due to the vibration generated due to the dead time such as the deceleration landing operation with the maximum passenger load.

 In order to further achieve the above object, in an elevator control apparatus according to the present invention, an unbalance ratio calculating means for calculating an unbalance ratio of a current of each system, and an output and an unbalance of the unbalance ratio calculating means. A comparison means for comparing the balance threshold value, and a notifying means for notifying when the output of the unbalance ratio calculation means exceeds the unbalance threshold value as a result of the comparison by the comparison means. And features.

According to the present invention, when the imbalance threshold is exceeded, a warning is issued by the notification means, and when the current imbalance does not improve, the necessity of maintenance can be promoted. Failure stop due to imbalance can be prevented. BRIEF DESCRIPTION OF THE FIGURES FIG. 1 is a schematic configuration diagram for explaining a conventional technique.

FIG. 2 is a schematic configuration diagram for explaining a first embodiment of the present invention.

FIG. 3 is a schematic configuration diagram for explaining a second embodiment of the present invention.

FIG. 4 is a view showing an example of magnetic pole position waveforms for explaining a second embodiment of the present invention. FIG. 5A and FIG. 5B are block diagrams for explaining a third embodiment of the present invention. FIG. 6 is a block diagram for explaining a fourth embodiment of the present invention.

FIG. 7 is a diagram showing a current waveform example for explaining a fourth embodiment of the present invention.

FIG. 8A and FIG. 8B are diagrams showing magnetic flux due to an armature current for explaining a fourth embodiment of the present invention.

FIG. 9 is a processing flowchart for explaining a fourth embodiment of the present invention.

FIG. 10 is a schematic configuration diagram for explaining a fifth embodiment of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION

 Hereinafter, an embodiment of a control device for an elevator according to the present invention will be described with reference to the drawings. In the following figures, the same symbols indicate the same or corresponding parts.

 (First Embodiment)

FIG. 2 shows an example of a system configuration according to the first embodiment of the present invention. As shown in the figure, the power supply 1 has a converter 2a and a converter 2b connected in parallel. Connect capacitor 3a to converter 2a and capacitor 4a between converter 2a and capacitor 3a (for waveform smoothing). Connect inverter 3b to converter 2b, and connect capacitor 4b (for waveform smoothing) between converter 2b and inverter 3b. The hoisting machine 6 is composed of a two-winding permanent magnet type synchronous motor. The winding A is connected to the inverter 3a, and the winding B is connected to the inverter 3b. A rotation detector (rotation sensor) 10 is connected to the motor shaft of the hoisting machine 6, and the output thereof can be inputted to the control means 5a. The car 8 is connected to the counterweight 7 by a main rope 9, and the main rope 9 is mounted on the hoist 6 so that the car 8 can be raised and lowered. The car 8 and the counterweight 7 are connected by the compensation 13 through the compensation 14.

 As a control configuration, for example, a control means 5a is connected to the inverter 3a and the inverter 3b to control the inverter. The control means 5b is connected to the converter 2a and the converter 2b to control the converter. Current detectors 12a, 12b, 12c, and 12d are provided for converters 2a, 2b, and impellers 3a, 3b, respectively, and voltage detectors 15a, 1 are provided for the DC section. 5b are provided, and their outputs can be detected by the control means 5a and the control means 5b. The control means 5a and the control means 5b are connected by the communication means 11 and can exchange information with each other.

As a control configuration, an adjustment element is added to the output の of the rotation detector 10 in each of the A system and the B system. As the adjustment element, the motor is manually rotated during adjustment to determine a fixed value from the phase of the induced voltage, and this fixed value is input as the magnetic pole adjustment element 0 adja and Θ ad jb. In addition, for each of the A and B systems, the magnetic pole adjustment elements 0 ad ja and 0 adjb are added, and 0 a and 0 b are added to the 3-phase / 2-phase converter (detection current dq converter) and 2-phase / 3-phase. Give to the converter. The output 回 転 of the rotation detector 10 is input to the speed detecting means. The difference between the output ω of the speed detection means and the speed command ω * is obtained, and the result is output to the speed control unit. The signals detected by the current detectors 12a and 12c are converted into three-phase and two-phase signals by the three-phase and two-phase converter (detection current dQ converter). The result calculated by the speed controller is given to the A and B current controllers in common. The difference between the torque command (Q-axis current command) and the A system current feedback value and the B system current feedback value is output to the current control unit of each system. The output of the current control section is converted into two-phase and three-phase signals and output to the PWM circuits of the respective systems. The GATE A signal is sent to the A-system inverter 3a, and the GATE-B signal is sent to the B-system inverter 3b. No. is output, and the control of the imper is performed. Magnetic flux is armature inductance

From L and current I <1 (f = L XI Q, which can be made uniform in the A and B systems. The induced power during motor rotation is e α = ωφ, and in the Α system Β system If φ is the same, the induced voltage is the same in Α system and Β system. Then it becomes uniform.

 The voltage values Vd and VQ on the two-phase axis are represented by the following equations.

V d R + P — ω L

(1) ただし、 R：インピーダンス、 L：インダク夕ンス, Vq ω then R + PL

(1) However, R: impedance, L: inductance,

 P: differential operator, ed, eq: induced power. As described above, individual current control means is provided for each motor winding system of a multi-winding permanent magnet synchronous motor, the same torque command is given, the magnetic poles are adjusted, and the q-axis current is controlled uniformly. By controlling the magnetic flux uniformly, it is possible to improve the current imbalance of each motor winding system, prevent an abnormal stop of the elevator due to a decrease in the efficiency of the inverter, and improve the riding comfort due to vibration. Can be.

 (Second embodiment)

Hereinafter, a second embodiment of the present invention will be described with reference to FIG. The configuration of this embodiment shown in FIG. 3 is the same as that of FIG. 2, but the control configuration is such that the magnetic pole adjusting elements 0 ad ja and 0 adjb is added, and pole correction elements A0a and A0b are added to A and B systems respectively. 0a and 0b are converted to 3-phase 2-phase converter (detection current dq converter) and 2-phase / 3-phase conversion. Give to the department. Next, a method of calculating the magnetic pole correction elements Δøa and Δ0b will be described. In the case of a permanent magnet synchronous motor, the relationship between the magnetic pole position and the armature inductance is such that when a current flows in the same direction as the magnet's magnetic flux, the inductance decreases due to the magnetic saturation of the iron core, and the inductance decreases in the direction perpendicular to the magnet's magnetic flux. It is known that the inductance increases when a current is applied. Fig. 4 shows the relationship between the magnetic pole position 表 わ and the inductance L. Therefore, when the elevator is stopped, the magnetic pole position of the motor rotor and the 90 ° advancing direction (A system: 0 adja + 90 ° direction, B system: 0 adjb + 90 Flow in the direction (° direction), and measure a and b in response to the current. The response time constant of the motor is expressed as = L / R. Since L and R of the motor are known values, the value is expressed as 0 = L0 / R0. As a result of the measurement, let the time constant of the A system be a and the time constant of the B system be b. For example, if the time constant is closer to 0 than a, then the B response is adjusted to the response of the A system. The magnetic pole position has been adjusted to around 90 degrees to some extent in advance, and if it is considered that the magnetic pole does not deviate by 180 degrees during manufacturing, the following correction can be made. As shown in Fig. 4, if the response of system B is faster than that of system A, Δ0b1 is corrected in the direction of increasing the value of L (the direction of π as the angle), and 90 ° Measure the response again in the forward direction (0 adjb + A 0 bl + 9 O ° direction). If the responses match, that value is determined as the correction value. If the responses do not match, the correction angle n △ 0b1 at which the matches are repeated n times until they match is determined as the correction value △ 0b.

 As described above, by correcting the magnetic poles of the 2-winding permanent magnet synchronous motor so that the current responses of the A and B systems match, the current imbalance of each motor winding system due to the misalignment of the magnetic pole position It is possible to prevent abnormal stoppage of the elevator due to a drop in efficiency during the night and improve riding comfort due to vibration.

(Third embodiment) 3 007869

Hereinafter, a third embodiment of the present invention will be described with reference to FIGS. 5A and 5B. The basic configuration of this embodiment is almost the same as that of FIG. 2, except that a magnetic flux compensating means is added to the current control unit, and the current control unit which is changed is shown in FIGS. 5A and 5B.

 A system will be described. The torque command Tm takes the difference from the feedback value Iqa as the q-axis current command Iqa * and outputs it to the PI control unit. On the d-axis side, the feedback values I da and I db of the A-system and B-system are input to the d-axis magnetic flux correction calculation unit 41 a. The difference between the output and the feedback value Ida is calculated and output to the PI control unit. Input d-axis and Q-axis PI control output to 2-phase / 3-phase converter. In the two-phase / three-phase conversion, conversion is performed at the A-system angle 0a and the output voltage command is output to the PWM unit. The B-system has the same configuration. The torque command inputs the same Tm as the A-system, takes the difference from the feedback value Iqb as the Q-axis current command, and outputs it to the PI control unit. The d-axis side inputs the feedback values Ida and Idb of the A and B systems to the d-axis magnetic flux correction calculator 41b. The difference between the output and the feedback value Idb is calculated and output to the PI control unit. Input d-axis and Q-axis PI control output to 2-phase / 3-phase converter. Two-phase and three-phase conversion is performed at the angle 0b of the B system, and the output voltage command is output to the PWM unit. The d-axis magnetic flux correction calculation unit 41 compares, for example, the magnitudes of the feedback currents IQa and IQb of the A and B systems.If the B system is small, the d-axis current Idb of the B system flows in the positive direction. This increases the magnetic flux in the same direction as the magnet and increases the induced voltage. The current can be made uniform by applying magnetic flux correction in the same direction as the magnet so that the voltages V Q of the A system and the B system match.

 Also, the magnetic flux is corrected so that, for example, if the system B is large, the d-axis current I db is made to flow in the negative direction so that the magnetic flux in the same direction as the magnet is weakened so as to lower the voltage of the system with the larger current. You may make it decrease.

As described above, even if the magnetic flux of the permanent magnet varies in each system, the d-axis current adjusts the magnetic flux in the magnetic flux direction of the permanent magnet, adjusts the magnetic flux in each winding system, and equalizes the voltage. 2003/007869

In this way, the current in each system can be controlled uniformly, preventing abnormal stoppage of the elevator due to a reduction in efficiency during inversion, and improving riding comfort due to vibration.

 (Fourth embodiment)

 Hereinafter, a fourth embodiment of the present invention will be described with reference to FIG. 6 to FIG. Usually, the armature current flows so that the same magnetic flux is generated in the A system and the B system.However, when the motor is operated with a light load, the current does not flow much and the dead time affects the operation. come. The dead time is to turn off both elements for a certain period of time so that the P side and the N side are not short-circuited.If the output current in the evening is sufficiently large, there is no dead time waveform distortion, and if the output current is small near the zero cross, The current waveform is distorted instead of a sine wave due to the influence of the dead time. As a result, vibration is generated, which affects the ride comfort of the elevator. FIG. 7 shows an example of the waveform. Current waveform example 1 shows a waveform example affected by the dead time, and current waveform example 2 shows a waveform example when a sufficient current flows.

 Next, the configuration of this embodiment will be described. The configuration is the same as in FIG. However, the control configuration was changed, and the control block diagram is shown in Fig. 6. In addition to the configuration shown in FIG. 2, a magnetic flux calculation unit 51 is added to the current control unit so that it is output as an A-system current command and a B-system current command. When the A and B windings are wound around one iron core, the direction of magnetic flux generation in the A and B systems is usually the same, and the required magnetic flux Φ1 is generated. Φ 1 = φ & + φ). By outputting in such a way that the directions in which magnetic fluxes are generated in the Α and Β systems cancel each other, sufficient current can be supplied to obtain the required magnetic flux (Φ 1 = φ a− d) b).

In the magnetic flux calculation unit 51, when the torque command Tm is input and the torque command is smaller than T1, for example, when a magnetic flux of Φ1 is required, the current command of the A system outputs Iqax and generates a. In the magnetic flux reversing unit in the magnetic flux calculating unit 51, the B system outputs a current command I d bx such that the composite magnetic flux becomes φ 1 and generates a magnetic flux ci) b. That is, A The system outputs a current command IQ a X such that the sum with the current command of the B system matches the torque command, and generates a magnetic flux Φ a (Fig. 8A, Fig. 8B).

 Fig. 9 shows a flowchart. The operation of the magnetic flux calculator 51 will be described with reference to FIG. In step S801, a torque command Tm is input. In step S802, the torque Tm and T1 are compared. If Tm is small, proceed to step S803. In step S803, reciprocal magnetic flux control is performed. If Tm is large in step S2, the process proceeds to step S804, and normal control is performed. As described above, when the torque command Tm is smaller than T1, the necessary magnetic flux Φ1 is obtained by generating the magnetic flux in the direction of canceling the magnetic flux in the A system and the B system.

 As described above, by controlling the A and B systems to generate magnetic flux in the direction of canceling out, the inverter can output a sufficient current that is not affected by the dead time. Preventing current waveform distortion can improve ride comfort due to vibration.

 (Fifth embodiment)

 Hereinafter, a fifth embodiment of the present invention will be described with reference to FIG. The basic configuration of this embodiment shown in FIG. 10 is the same as that of FIG. 2, except that display means is added to FIG. In addition, a current unbalance detector is added as a control configuration.

 The output signals 1 and Ib of the current detectors 12c and 12 are input to the absolute value circuits 91a and 91b, respectively. The output side of the absolute value circuits 91a and 91b is connected to the filter circuits 92a and 92b, and the average current is output.

 The output side of the filter circuit is connected to an unbalance ratio operation circuit 93 so that the ratio of the A system and the B system can be calculated. The output side of the unbalance ratio calculation circuit 93 is connected to a comparison circuit 94, which compares it with a predetermined unbalance threshold and outputs a warning to the display 16 when the threshold is exceeded.

(warning) The threshold is determined to be 130% for overcurrent detection on one side of the amplifier. If so, a threshold value is set at a place lower than the overcurrent detection. For example, to detect when 20% drop on one side and increase by 20% on one side, 0.66 (= 0.8 / 1.2) <B / A <1.5 (= 1.2 / 0.8) Set a threshold.

 As described above, the current imbalance ratio calculation means, the comparison means for comparing the output of the calculation means with the impairment threshold value, and the display means are provided, and when the imbalance threshold value is exceeded, the display means is notified. In this way, if current imbalance does not improve without abnormal stop due to overcurrent, the necessity of maintenance can be promoted, and failure stop due to current imbalance can be prevented. Industrial applicability

 As described above, according to the present invention, individual current control means is provided in each motor winding system of a multi-winding motor, and the same torque command is given to uniformly control the magnetic flux. The current imbalance of the line system can be improved to prevent abnormal stoppage of the elevator due to a decrease in efficiency at night, and also to improve riding comfort due to vibration.

 Further, according to the present invention, the current imbalance of each motor winding system due to misalignment of the magnetic pole position is improved by correcting the magnetic poles of the multi-winding motor so that the current responses of the respective systems match each other. Abnormal stoppage of the elevator due to a drop in efficiency can be prevented, and ride comfort due to vibration can be improved.

 Furthermore, according to the present invention, even if the magnetic flux of the permanent magnet fluctuates in each system, the magnetic flux in the magnetic flux direction of the permanent magnet is adjusted by the d-axis current, the magnetic flux in each winding system is adjusted, and the voltage is uniformly controlled. This makes it possible to control the current of each system evenly, prevent abnormal stoppage of the elevator due to reduced efficiency of the impeller, and improve the riding comfort due to vibration.

Furthermore, according to the present invention, the magnetic flux is generated in a direction to cancel the magnetic flux in each system. By controlling the inverter, the inverter can output a sufficient current that is not affected by the dead time, and the riding comfort due to vibration can be improved by preventing current waveform distortion due to the dead time.

 Furthermore, according to the present invention, when the current unbalance ratio exceeds the unbalance threshold, a warning is issued by the notification means, so that the current imbalance is not improved without abnormal stop due to overcurrent. Can promote the necessity of maintenance, so that failure stop due to current imbalance can be prevented.

Claims

The scope of the claims 1. A hoist consisting of a multi-winding motor that raises and lowers the elevator  A plurality of inverter devices and a converter device for driving the multi-winding motor;  Rotation detection means for detecting the rotation position of the shaft of the multi-winding motor,  A control device for controlling the elevator device and the compa- rator device, the elevator control device comprising:  An elevator control device characterized by providing individual current control means for each motor winding system to uniformly control the q-axis current and to uniformly control magnetic flux in each system. 2. A hoist comprising a multi-winding motor that raises and lowers the elevator;  A plurality of inverter devices and a comparator device for driving the multi-winding motor;  Rotation detection means for detecting the rotation position of the shaft of the multi-winding motor,  A control device for controlling the elevator device and the control device for controlling the converter device,  A control device for an elevator, wherein the magnetic pole position of each system is estimated from the armature inductance, and the magnetic pole position is corrected so as to match one of the systems. 3. A hoist consisting of a multi-winding motor that raises and lowers the elevator,  A plurality of inverter devices and a converter device for driving the multi-winding motor; Rotation detection means for detecting the rotation position of the shaft of the multi-winding motor, A control device for controlling the electromagnetic device and the compensating device;  An elevator control device characterized by adjusting the magnetic flux in the magnetic flux direction of the permanent magnet by the d-axis current, and controlling the current in each system evenly by controlling the voltage equally in each winding system. 4. A hoist comprising a multi-winding motor that raises and lowers the elevator;  A plurality of inverter devices and a converter device for driving the multi-winding motor;  Rotation detection means for detecting the rotation position of the shaft of the multi-winding motor,  A control device for controlling the impeller device and the converter device, the elevator control device comprising:  An elevator control system characterized by flowing an armature current so that magnetic flux is generated in each system in a direction to cancel each other in order to obtain the required magnetic flux at low speed operation 5. The elevator control device according to any one of claims 1 to 4, wherein the unbalance ratio calculating means for calculating an unbalance ratio of the current of each system, and the output of the imbalance ratio calculating means is unbalanced. Means for comparing thresholds;  When the output of the unbalance ratio calculation means exceeds the unbalance threshold value as a result of the comparison by the comparison means,  A control device for an elevator that comprises: