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Motor Phase Current Reconstruction Method Based on Symmetrical PWM Carrier

A phase current reconstruction and motor technology, which is used in motor generator control, AC motor control, electronic commutation motor control, etc., and can solve the problem that phase current reconstruction cannot be completed in non-observation areas.

Active Publication Date: 2016-06-22
东元总合科技(杭州)有限公司
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Problems solved by technology

[0010] The purpose of the present invention is to solve the problem that the phase current cannot be reconstructed by SVPWM modulation in the non-observation area at the boundary of the sector by means of single current sampling for existing motors operating at medium and high speeds, and to provide an algorithm that is easy The implementation and control effect are relatively good, and the motor phase current reconstruction method based on symmetrical PWM carrier

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  • Motor Phase Current Reconstruction Method Based on Symmetrical PWM Carrier
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  • Motor Phase Current Reconstruction Method Based on Symmetrical PWM Carrier

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[0032] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific illustrations.

[0033] It is a mature technology to detect motor phase current through DC bus current sampling (single current sampling). Its main purpose is to overcome the problems of high cost and large volume when using current sensors to detect motor phase current. It is widely used when the accuracy does not need to be too high and the cost needs to be reduced.

[0034] Before explaining the single current sampling to detect the phase current of the motor, first briefly introduce the space vector modulation (SVPWM). Such as figure 2 As shown, the space vector modulation is to divide the modulation space vector into 6 sectors, 6 basic space vectors, and two zero vectors, so that any direction and size of the modulation space vector can be composed of two...

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Abstract

The purpose of the present invention is to solve the problem that the phase current cannot be reconstructed by SVPWM modulation in the non-observation area at the boundary of the sector by means of single current sampling for existing motors operating at medium and high speeds, and to provide an algorithm that is easy The implementation and control effect are relatively good, and the phase current reconstruction method of the motor based on the symmetrical PWM carrier. The method decomposes the modulation vector into two non-zero basic space vectors adjacent to the non-zero basic space vector in the boundary area of ​​the sector, and uses a single current sampling method to reconstruct the phase current of the motor during the action of the two adjacent non-zero basic vectors. The invention enables the non-observation area in the sector boundary area to be modulated by symmetrical PWM mode, transforms the non-observation area into an observable area, and can effectively reconstruct the phase current of the motor in the non-observation area by means of single current sampling.

Description

technical field [0001] The invention relates to the technical field of motor phase current reconfiguration, in particular to a motor phase current reconfiguration method based on a symmetrical PWM carrier. Background technique [0002] In the AC motor control system, the phase current detection of the motor is a key link. The classic method is to use the current sensor to detect the phase current of the motor, that is, set 3 or at least 2 current sensors at the AC output end to provide the phase current feedback signal. Commonly used current sensors are Hall effect detectors, which are not only expensive but also bulky and difficult to integrate in power electronics. Therefore, in the case that the precision does not need to be too high and the cost needs to be reduced, a method of detecting the phase current of the motor by sampling the DC bus current is proposed. [0003] The phase current of the motor is detected by DC bus current sampling, which is often referred to as...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/12H02P27/12
Inventor 叶林华董炀斌
Owner 东元总合科技(杭州)有限公司
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