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Safe and reliable starting control method of sensorless brushless DC motor

A brushless DC motor and sensor technology, applied in the fields of brushless DC motor start-up control, industry, and aerospace control, can solve the problems of lack of implementation process and failure of theoretical guidance, and achieve the effect of easy detection.

Active Publication Date: 2018-02-23
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the principle is simple, the implementation process lacks theoretical guidance and is prone to failure due to parameter perturbation, so the application of sensorless BLDC motors in the low speed range is limited by these shortcomings

Method used

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  • Safe and reliable starting control method of sensorless brushless DC motor
  • Safe and reliable starting control method of sensorless brushless DC motor
  • Safe and reliable starting control method of sensorless brushless DC motor

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Embodiment Construction

[0052] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0053] like figure 1 As shown, in the specific implementation process, the specific implementation steps of a safe and reliable sensorless brushless DC motor start-up control method of the present invention are as follows:

[0054] (1) Calculate the minimum current value injected for reliable positioning in the pre-positioning stage and complete the pre-positioning. The minimum starting current to ensure the reliable positioning of the rotor by the two-step pre-positioning method can be calculated by the following formula

[0055]

[0056] After the current value is calculated according to the actual motor parameters, the pre-positioning position is set, and the positioning operation is completed through a two-step pre-positioning method.

[0057] (2) Inject acceleration current

[0058] After the pre-positioning is completed, start the l...

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Abstract

The invention relates to a safe and reliable starting control method of a sensorless brushless DC motor. A minimum current value which is required to be injected by a two-step pre-positioning method is obtained by analyzing a relation between a preset current and an instantaneous position of a pre-positioning stage, a zero-crossing point is detected according to linear voltage difference after pre-positioning is ended, a zero-crossing point of a counter potential of a motor within a first commutation zone can be measured by injecting an appropriate acceleration current, and smooth commutationis further ensured; and by the method, the motor can be directly transitioned to a self-synchronization stage from the pre-positioning stage.

Description

technical field [0001] The invention relates to the technical field of start-up control of a brushless DC motor, in particular to a safe and reliable start-up control method of a sensorless brushless DC motor, which is applicable to the fields of industrial and aerospace control and realizes start-up of a sensorless brushless DC motor. Background technique [0002] Brushless DC motors are widely used in industrial production, aerospace and military fields due to their high power density, high efficiency, high torque inertia ratio, and compact structure. Traditional brushless DC motors require position sensors to provide rotor position information to achieve accurate commutation control. However, the installation of position sensors not only increases equipment costs, but also puts forward higher requirements for the daily maintenance of the motor, and also reduces Overall system stability and reliability. In order to avoid the above adverse effects, position sensorless moto...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/20H02P6/182
Inventor 周新秀陈曦周咏平
Owner BEIHANG UNIV