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Permanent magnet synchronous motor MTPA control and single current flux weakening control method

A permanent magnet synchronous motor and field-weakening control technology, applied in motor control, AC motor control, control systems, etc., can solve the problems of speed and torque fluctuations, difficulty in synchronous seamless connection, large switching, etc., to ensure stability sexual effect

Inactive Publication Date: 2019-03-19
XIANGTAN ELECTRIC MFG CORP LTD
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Problems solved by technology

Switching from MTPA control to single-current flux-weakening control, since the two methods of calculating the direct-axis voltage are different, refer to figure 1 u shown q1 with u q2 It is difficult to achieve synchronous seamless connection, so there are large speed and torque fluctuations during switching, and the fluctuations of speed and torque will affect the switching conditions, which may cause the system to frequently operate at the switching point, which in turn causes greater switching fluctuations, and even system divergence

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  • Permanent magnet synchronous motor MTPA control and single current flux weakening control method
  • Permanent magnet synchronous motor MTPA control and single current flux weakening control method

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with drawings and embodiments.

[0023] With reference to accompanying drawing, a kind of permanent magnet synchronous motor MTPA control and single current field weakening control method, it comprises the following steps:

[0024] Step 1. Detect motor speed n, rotor position angle θ, and motor three-phase current i a , i b , i c , and calculate the direct axis current i of the permanent magnet synchronous motor d and quadrature current i q ;

[0025] Step 2. According to the direct axis current i d , quadrature axis current i q Calculate the electromagnetic torque value T with the motor parameters e , the given torque value T m and the electromagnetic torque value T e Carry out error calculation, and then send it to PI controller Ⅰ to obtain the reference value of quadrature axis current i q ';

[0026] Step 3. Use the maximum torque current ratio (MTPA) algorithm to calculate the given val...

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Abstract

The invention relates to a permanent magnet synchronous motor MTPA control and single current flux weakening control method comprising, determining whether iq* is greater than iq and whether us is less than or equal to usmax; if so, calculating the error of a quadrature-axis current given value iq* and a quadrature-axis current iq by using a maximum torque per ampere (MTPA) control strategy to obtain a quadrature-axis current difference value eiq, switching a controller to selects eiq, sending the eiq to a PI controller II, and obtaining uq by coupling compensation; and if not, by using a single current control strategy, directly calculating the uq based on a formula described in the specification. The method uses us <= usmax as the condition for activating the flux weakening control and uses the iq* > iq as the condition for quitting the flux weakening control, so that the two control strategies including the MTPA control and the single current flux weakening control can be smoothly switched, and the stability of the system is ensured after switching.

Description

technical field [0001] The invention relates to the technical field of motor control, in particular to an MTPA control and single current field weakening control method for a permanent magnet synchronous motor. Background technique [0002] Among many types of motors, the permanent magnet synchronous motor (PMSM) is gradually developing into the mainstream drive motor of electric vehicles due to its small size, light weight, high efficiency, high power density, and other significant advantages. In order to make the hybrid electric vehicle have better dynamic performance, the motor is required to have a wider speed regulation range and a larger output torque, and its constant power operating range should be larger. As the motor speed increases, the back EMF of the motor stator winding increases linearly. When the motor control demand voltage reaches or exceeds the maximum voltage that the controller can provide, field weakening control must be performed. However, with the i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P25/022H02P23/00
CPCH02P23/0027H02P25/022H02P2207/05
Inventor 蒋说东罗涛李理刘训龙
Owner XIANGTAN ELECTRIC MFG CORP LTD
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