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Direct torque control method of high load capacity of five-phase permanent magnetic synchronous motor

A permanent magnet synchronous motor, direct torque control technology, used in motor control, motor generator control, AC motor control and other directions

Active Publication Date: 2017-10-03
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, both the saliency phenomenon of the motor and the harmonics of the motor can be used to enhance the load capacity of the motor. How to combine the advantages of these two aspects to construct a multi-phase permanent magnet synchronous motor drive system with high load capacity has not been published in the literature.

Method used

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  • Direct torque control method of high load capacity of five-phase permanent magnetic synchronous motor
  • Direct torque control method of high load capacity of five-phase permanent magnetic synchronous motor
  • Direct torque control method of high load capacity of five-phase permanent magnetic synchronous motor

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Embodiment Construction

[0089] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0090] Such as figure 1 As shown, a direct torque control method for a five-phase permanent magnet synchronous motor with high load capacity includes the following steps: Step S1: Using the orthogonal transformation matrix T 5 The five-phase input current i of the motor sA ~i sE transform to alpha 1 beta 1 -α 3 beta 3 In the stationary coordinate system, the fundamental wave current i is obtained sα1 i sβ1 , the third harmonic current i sα3 i sβ3 , α 1 beta 1 and alpha 3 beta 3 are the fundamental and third harmonic stationary coordinate systems, respectively;

[0091]

[0092]

[0093] Among them, i sz Be the zero-sequence current, α=72°; Since the research object of the present invention is a five-phase symmetrical winding permanent magnet synchronous motor,

[0094] And connect the stator windings in a star shape, so t...

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Abstract

The invention provides a direct torque control method of high load capacity of a five-phase permanent magnetic synchronous motor, and aims to a five-phase symmetrical winding permanent magnetic synchronous motor. Stator windings are connected into a star shape; counter electromotive force of the stator windings of the five-phase permanent magnetic synchronous motor contains a high proportion of third harmonic; the voltage vector is outputted by a five-phase inverter; at the same time, a direct control strategy of a double electromagnetic toque and a stator flux linage is structured in a fundamental harmonic plane and a third harmonic plane; and simultaneously, a maximum torque algorithm of each ampere is structured by using a salient-pole phenomenon of the motor, so as to continuously refresh the amplitude value of the stator flux linage on the two planes. The control method reduces the current peak of the stator winding, structures the maximum torque control algorithm of each ampere of the salient-pole type five-phase permanent magnetic synchronous motor, and utilizes the maximum torque control algorithm to update the amplitude value of the stator flux linage on the fundamental harmonic plane and the third harmonic plane; further, the load capability of the motor is enhanced; and the current of the stator winding is reduced.

Description

technical field [0001] The invention belongs to the technical field of motor control, and in particular relates to a direct torque control method with high load capacity of a five-phase permanent magnet synchronous motor. Background technique [0002] The multi-phase permanent magnet synchronous motor drive system has the advantages of multi-degree-of-freedom control, so its drive system has high operational reliability. Even if the motor winding is out of phase or the inverter bridge arm is faulty, the fault-tolerant operation of the motor can still be realized with the help of the remaining control degrees of freedom. . Due to the use of permanent magnets for excitation, all the current flowing into the stator winding can be active components, thereby realizing high power factor operation on the stator side of the motor. Therefore, the multi-phase permanent magnet synchronous motor has unique application advantages in occasions requiring high reliability and high power fa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/30H02P27/12H02P6/28
CPCH02P6/28H02P21/30H02P27/12H02P2205/01H02P2207/05
Inventor 周扬忠闫震钟天云
Owner FUZHOU UNIV
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