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Motor driving device and method for removing torque pulsation

A technology of motor driving and driving force, applied in torque ripple control, control of electromechanical transmission, single motor speed/torque control, etc., can solve the problems of harsh environmental conditions and high sensor price

Inactive Publication Date: 2013-06-19
TOSHIBA ELEVATOR KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such sensors are expensive, and the use environment conditions are harsh. Further, there are restrictions on the need for inspection, maintenance, etc.

Method used

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  • Motor driving device and method for removing torque pulsation
  • Motor driving device and method for removing torque pulsation
  • Motor driving device and method for removing torque pulsation

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Embodiment Construction

[0035] First, before describing the present embodiment, the torque ripple caused by the bias voltage of the current sensor and the principle of removing the torque ripple will be described.

[0036] Applying the vector control method as the driving method of the three-phase AC motor, the technology of driving the driven object while controlling the torque and thrust has been widely used. At this time, it is necessary to detect the currents of at least two phases of the three phases of the three-phase AC motor. Three-phase AC motors include various types such as induction motors and synchronous motors. For simplicity, a permanent magnet type synchronous motor is used as an example for description.

[0037] Now consider installing a current sensor on U-phase and W-phase among the three phases U-phase, V-phase, and W-phase.

[0038] The currents flowing in U phase, V phase and W phase are respectively i ur i vr i wr .

[0039] Let the current of the static coordinate α-axis ...

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PUM

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Abstract

The present invention provides a motor driving device and a method for removing torque pulsation. A pulsation calculator (25) calculates the pulsation component of a dq axis current which is caused by a bias voltage of a current sensor (17) based on an output value of a rotating transformer (15) and an output value of a dq coordinate converter (19). A pulsation subtractor (41) subtracts the pulsation compoent from the dq axis current based on the calculation result of the pulsation calculator (25). On the other hand, a bias voltage calculator (31) calculates the bias voltage of the current sensor (17) based on the calculation result of the bias voltage calculator (31). A bias voltage compensator (33) subtracts a bias voltage calculation result from an output voltage of the current sensor (17). Therefore, the bias voltage of the current sensor (17) is compensated automatically. The torque pulsation caused by the bias voltage of the current sensor (17) is reduced along with the rotationof a rotating motor (11).

Description

technical field [0001] The present embodiment relates to a motor drive device used in, for example, an elevator, and a method for removing torque ripple. Background technique [0002] A technique of externally driving an object to be driven by the torque of a rotary machine such as a motor or the thrust of an actuator such as a linear motor has been widely used. For such a device, if there is a pulsating component in the torque or thrust, the entire device will vibrate, making it difficult to impart a predetermined motion to the driven object. [0003] For example, for an elevator system, the passenger car is vibrated up and down according to the cycle of torque pulsation, which impairs the comfort of passengers. For electric vehicles, noise is generated based on the cycle of torque pulsation, causing the vehicle body to vibrate, thereby significantly degrading the riding experience. Further, the thrust pulsation of the linear servo motor becomes a main cause of speed inst...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P6/10H02P21/00H02P6/06H02P6/08H02P6/18H02P6/28H02P21/05H02P21/14H02P21/18H02P21/22H02P21/24H02P23/04H02P23/14H02P27/04H02P29/00
Inventor 森下明平
Owner TOSHIBA ELEVATOR KK