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A multi-phase motor balance control method and its application

A multi-phase motor, balanced control technology, applied in motor generator control, electronic commutation motor control, control system and other directions, can solve problems such as power imbalance, large electrical stress, inconsistent battery charging and discharging state, etc. balanced effect

Active Publication Date: 2017-12-15
中国船舶重工集团公司第七一二研究所
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unbalanced power will cause the devices of individual channels to bear excessive electrical stress, or make the charging and discharging states of the batteries of each channel inconsistent, which will endanger the operation safety and equipment life

Method used

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  • A multi-phase motor balance control method and its application
  • A multi-phase motor balance control method and its application
  • A multi-phase motor balance control method and its application

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Embodiment Construction

[0025] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0026] refer to figure 1 As shown, in order to solve the current balance problem during the field-weakening operation of multi-phase AC motors, the present invention discloses a multi-phase motor balance control method, the steps are as follows

[0027] a) Calculate the field weakening compensation current of each three-phase channel respectively.

[0028] b) Selectively add the field-weakening compensation currents of each channel to obtain a unified field-weakening compensation current.

[0029] c) Correct the D-axis and / or Q-axis reference current with a uniform field-weakening compensation current to obtain the final D-axis reference current and Q-axis reference current, which are applied to each three-phase channel.

[0030] Take a 9-phase permanent magnet motor with 3 three-phase channels as an example:

[0031] a) Calculate the required field weaken...

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Abstract

The invention discloses a multi-phase motor balance control method, the steps are: respectively calculating the field-weakening compensation current of each three-phase channel, selectively adding the field-weakening compensation current of each channel to obtain a unified field-weakening compensation current, and using The unified field weakening compensation current corrects the D-axis and / or Q-axis reference currents to obtain the final D-axis reference current and Q-axis reference current, which are applied to each three-phase channel; this method adopts the strategy of independent detection and unified adjustment, Under the premise that the current of each channel is kept balanced, the multi-phase motor realizes the field-weakening control of a wide voltage range or a wide speed range, and realizes the current balance between multiple channels during the field-weakening operation; it also discloses that the method can be used in multi-phase inverters, Applications in multi-phase motor propulsion systems, electric vehicles, electric propulsion ships and electric traction rail transit vehicles.

Description

technical field [0001] The invention belongs to the technical field of AC motors and their control, and in particular relates to a multi-phase motor balance control method and its application. Background technique [0002] In the fields of electric vehicles and ship propulsion, AC motors usually use batteries as power sources. If the battery SOC is low, the DC bus voltage will drop, and the voltage output capability of the converter device will drop, which may cause the actual output voltage to fail to reach the control system. fixed value, causing the motor to lose control. On the other hand, if the motor speed exceeds the rated value, it will cause the voltage demand to rise, and it will also cause the motor to lose control. [0003] The three-phase motor adopts a wide voltage / wide speed range control strategy based on the field-weakening compensation current. By adjusting the given current, the voltage reference value is always within the reachable range of the output of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/14H02P21/12
Inventor 朱磊汪伟张凡吴明李明勇
Owner 中国船舶重工集团公司第七一二研究所
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