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Real-time correction system and method for commutation phase of sensorless brushless DC motor

A brush DC motor, real-time correction technology, applied in the direction of electronic commutation motor control, control system, electrical components, etc., to achieve the effect of stable operation

Inactive Publication Date: 2017-02-22
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the above problems, the present invention overcomes the problem of commutation phase correction of the existing DC brushless motor, and proposes a real-time correction system and method for the commutation phase of the brushless DC motor without a position sensor

Method used

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  • Real-time correction system and method for commutation phase of sensorless brushless DC motor
  • Real-time correction system and method for commutation phase of sensorless brushless DC motor
  • Real-time correction system and method for commutation phase of sensorless brushless DC motor

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Embodiment 1

[0077] In this embodiment, an interior permanent magnet brushless DC motor is used for illustration. Brushless DC motor, Bmshless DC Motor, referred to as BLDCM.

[0078] Taking the detection of the A-phase terminal voltage as an example to illustrate the commutation phase correction method of the position sensorless DC brushless motor.

[0079] like figure 1 Shown is the circuit diagram of the three-phase full-bridge drive control circuit brushless DC motor, and the armature winding of the stator of the three-phase full-bridge drive brushless DC motor adopts a star connection structure. The three-phase full-bridge drive control circuit is controlled by two-two conduction mode, which means that the brushless DC motor has two-phase windings conducting at any time, and the other phase winding is in a suspended state, then the power switch Tubes VT1-VT6 have six switch combination states. The phases are commutated every 60° electrical angle, and one power switch tube is switch...

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Abstract

The invention discloses a real-time correction system and method for a commutation phase of a sensorless brushless DC motor. A set of winding terminal voltage component voltage detection circuit is added to a drive circuit adopting complementary type PWM control on the basis of a traditional back electromotive force sensorless detection circuit; corresponding output voltage of a turn-off phase component voltage detection circuit is sampled at a middle moment tx of each on state of the brushless motor; whether an on state commutation phase is leading or lagging can be judged according to the voltage; and the on state commutation phase is taken as a feedback signal corrected by the commutation phase and closed-loop regulation of the commutation phase is completed through PI regulation, so that optimal commutation of the brushless motor at any rotating speed and in any load condition is ensured and sensorless stable operation of the brushless motor is achieved.

Description

technical field [0001] The invention belongs to the technical field of brushless direct current motor control, and in particular relates to a real-time correction system and method for commutation phase of a brushless direct current motor without a position sensor. Background technique [0002] The permanent magnet brushless motor has the advantages of simple structure, high power density, and easy control. It is the first choice for high-speed motor design. Its control system mostly uses position sensors to detect the rotor position, but the existence of position sensors reduces the reliability of the motor and increases the volume of the motor. And the cost limits the application of this type of motor. In recent years, with the development of position sensorless technology, the application of position sensorless high-speed permanent magnet brushless motors has gradually increased. There are many methods for detecting the rotor position of position sensorless brushless DC m...

Claims

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Application Information

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IPC IPC(8): H02P6/185
CPCH02P6/188
Inventor 王兴华赵树刚盛跃龙李光友雷艳华
Owner SHANDONG UNIV
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