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PMSM (Permanent Magnet Synchronous Motor) single-resistor current reconstruction method and system

A permanent magnet synchronous motor and current reconstruction technology, which is applied in control systems, control generators, vector control systems, etc., can solve problems such as the influence of motor control effects and unspecified details, and achieve the goal of ensuring the maximum output capability and control effect Effect

Inactive Publication Date: 2017-05-31
SHANGHAI AEROSPACE AUTOMOBILE ELECTROMECHANICAL CO LTD
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  • Claims
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Problems solved by technology

In addition to the unobservable area of ​​sector transition, the difficulty of single-resistor sampling current reconstruction is the processing of the unobservable area in the shift saturation area of ​​the high-voltage modulation area. The former is also explained in many documents, but not in detail; and the latter There are no relevant literature descriptions
The latter processing needs to be combined with the space vector PWM control method to achieve the effect of current reconstruction and the output capability of the motor is basically consistent with the dual current sensor scheme, but ignoring this point will inevitably affect the motor control effect

Method used

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  • PMSM (Permanent Magnet Synchronous Motor) single-resistor current reconstruction method and system
  • PMSM (Permanent Magnet Synchronous Motor) single-resistor current reconstruction method and system

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Embodiment Construction

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0025] This embodiment discloses a single-resistance current reconstruction method for a permanent magnet synchronous motor combined with a PWM control method, such as figure 1 shown, including:

[0026] Step S11, calculation of the shift saturation area of ​​the high voltage modulation area:

[0027] The PWM shifting method adopts the extreme case that two PWMs can be shifted left and right respectively at the same time, and then according to the minimum...

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Abstract

The invention relates to a PMSM single-resistor current reconstruction method and system. After being started, a PMSM is operated in a CSVPWM manner, and whether a work state of the motor is in a phase-shift saturation area of a high voltage modulation zone is determined; and if YES, a spatial vector PWM is changed from CSVPWM into DSVPWM, and action time of an adjacent voltage vector is limited. Compared with the prior art, the cost is reduced, and the method and system can realize a PMSM control effect as that achieved by double current sensors.

Description

technical field [0001] The invention relates to the field of AC motor control, in particular to a single-resistance current reconfiguration method and reconfiguration system for a permanent magnet synchronous motor combined with a PWM control mode. Background technique [0002] In the vector control strategy of the AC motor, the phase current sampling performance is an important index, and the quality of the phase current sampling directly affects the final control effect of the motor. There are two common current sampling methods: 1. Use the Hall sensor to sample the two-phase current, and calculate the third-phase current according to the two-phase current. 2. Use the bus single resistor to sample the current to reconstruct the three-phase current of the motor. Although the dual-phase current sampling of the Hall sensor has high accuracy in phase current restoration, it is relatively large in size and high in cost, so it is not suitable for applications with high cost requ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/00
Inventor 郑冬霞赵立成杜春洋
Owner SHANGHAI AEROSPACE AUTOMOBILE ELECTROMECHANICAL CO LTD
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