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A sensorless commutation method for electrically excited doubly salient pole motors based on neutral point

A technology of electric excitation doubly salient poles and neutral point voltage, which can be used in winding excitation motor control, electronic commutation motor control, electronic commutator and other directions, and can solve problems such as difficulty in application

Active Publication Date: 2021-03-02
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] Purpose of the invention: Aiming at the problem that the existing electric excitation double salient pole motor sensorless control method is difficult to apply to the low speed to medium high speed full speed operating range, the present invention proposes a neutral point based electric excitation double salient pole motor sensorless commutation method

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  • A sensorless commutation method for electrically excited doubly salient pole motors based on neutral point
  • A sensorless commutation method for electrically excited doubly salient pole motors based on neutral point
  • A sensorless commutation method for electrically excited doubly salient pole motors based on neutral point

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Embodiment 1

[0041] refer to Figure 4 and Figure 5 , this embodiment provides a position sensorless commutation method for an electrically excited doubly salient pole motor based on a neutral point, which specifically includes the following steps:

[0042] Step S1: Reference figure 1 and figure 2 , sampling the neutral point voltage u of the motor when the power tube of the full-bridge converter is turned on n . details as follows:

[0043] The neutral point voltage of the motor is sampled at the midpoint of the power tube turn-on period of the three-phase full-bridge converter. If the switching period of the power tube is T and the duty ratio is D, then in each switching period Sampling the neutral point voltage of the motor at all times, such as figure 2 shown.

[0044] Step S2: Set the motor neutral point voltage u n The characteristic quantity u used for position sensorless commutation control is obtained by calculating the difference with the midpoint voltage of the busba...

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Abstract

The invention discloses an electro-magnetic doubly salient motor sensorless commutation control method based on neutral point voltage sampling. The method comprises the following steps: S1, sampling the neutral point voltage un of an electro-magnetic doubly salient motor at the moment when a power tube is turned on; S2, calculating the difference between the neutral point voltage un obtained by sampling and a bus midpoint voltage to obtain a sensorless commutation control characteristic quantity us; and S3, comparing the commutation control characteristic quantity us with a commutation threshold Ucom to judge a sector where a rotor is located, and determining the current energized phase of the motor. Sensorless commutation control of the electro-magnetic doubly salient motor is realized bysampling the neutral point voltage of the motor, the neutral point voltage is insensitive to the rotating speed of the motor, and the method can be applied to a full rotating speed domain from low speed to medium and high speed.

Description

technical field [0001] The invention relates to the technical field of motor control, in particular to a position sensorless commutation method for an electric excitation double salient pole motor based on a neutral point. Background technique [0002] As a new type of brushless reluctance motor, electrically excited double salient pole motor has the advantages of reliable structure, convenient control, and high fault tolerance performance. The electric excitation double salient pole motor needs to commutate according to the rotor position during the electric operation stage. The installation of the mechanical position sensor in the traditional system brings the problems of increased system volume and reduced reliability. The study of phase control method has important research significance. [0003] At present, the existing research adopts different position sensorless control strategies according to the operating speed range of the motor. In the medium and high speed stag...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P6/32H02P6/18
CPCH02P6/188H02P6/32
Inventor 周兴伟张犁吴峰
Owner HOHAI UNIV