Improved feed-forward permanent magnet synchronous motor flux weakening method

An improved technology for permanent magnet synchronous motors, which is applied in the control of generators, motor control, motor generator control, etc. It can solve the problems of large influence of parameter drift, difficulty in ensuring response speed, difficult parameter change compensation, etc., and achieve motor parameter less, the algorithm regulator is simple and easy, and the effect of high control efficiency

Inactive Publication Date: 2016-10-26
合肥威博尔汽车技术股份有限公司
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Problems solved by technology

Due to the non-linear calculation, it is difficult to guarantee the response speed in this field weakening method, and the formula calculation is greatly affected by the parameter drift of the motor during operation, so it is difficult to compensate for the parameter change

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  • Improved feed-forward permanent magnet synchronous motor flux weakening method

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[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0018] Such as figure 1 As shown, the embodiment of the present invention provides an improved feedforward permanent magnet synchronous motor field weakening method, which includes the following steps:

[0019] S1: The vehicle controller sends out a torque request T*, and inputs the torque request T* into the maximum torque current ratio MTPA module of the motor controller, and the maximum torque current ratio MTPA module is based on the quadrature axis inductance ...

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Abstract

The invention provides an improved feed-forward permanent magnet synchronous motor flux weakening method. The method comprises the following steps: a vehicle controller issues a torque request T<*>, and a motor permanent magnet flux fai converts the torque request T<*> to quadrature-axis current iq1 and direct-axis current id1 requests; ia and ib are subjected to per unit processing and then enter Clark inverse transform and Parker inverse transform for vector transform to obtain real-time quadrature-axis current iq and direct-axis current id; an error e1, quadrature-axis voltage uq<*> and a direct-axis current request id3 are acquired; a direct-axis current id2 is acquired through a regulator PI3, and direct-axis voltage ud<*> is obtained through a regulator PI2; and the switching state of each power switching tube is acquired and obtained, and current input to a driving motor MOTOR is finally completed via an inverter circuit. The dynamic response characteristics can be quickened, voltage saturation in the case of deep flux weakening can be prevented, and the method of the invention has the advantages that the control efficiency is high, dependence on motor parameters is little, and the algorithm regulator is simple and easy to operate.

Description

technical field [0001] The invention relates to the technical field of motors, in particular to an improved field weakening method for a feedforward permanent magnet synchronous motor. Background technique [0002] The permanent magnet synchronous motor generally adopts the maximum torque current ratio (MTPA) control mode below the base speed and adopts the field weakening control mode above the base speed to ensure the maximum output power. There are mainly two current field weakening control strategies: one is to derive the relationship between the rotational speed and the direct-axis current on the basis of theoretical analysis, and use the motor parameters to calculate the direct-axis current id required to reach the specified rotational speed. Due to the non-linear calculation, it is difficult to guarantee the response speed in this field weakening method, and the formula calculation is greatly affected by the parameter drift of the motor during operation, so it is diff...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/00H02P21/14
CPCH02P2205/01H02P2207/05
Inventor 谢春林
Owner 合肥威博尔汽车技术股份有限公司
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