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Brushless direct current motor counter electromotive force phase point detecting method

A technology of brushed DC motor and counter electromotive force, which is applied in the direction of electronically commutated motor control, electronic commutator, electrical components, etc., can solve the problems of high cost and short freewheeling time, and achieve low cost, high detection reliability, The effect of improving safety and reliability

Inactive Publication Date: 2013-07-03
ANHUI ZHONGJIA ZHIRUI TECH
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AI Technical Summary

Problems solved by technology

But this method is not suitable for motors with small armature inductance, the freewheeling time is too short, an external comparator is required, and the cost is too high

Method used

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  • Brushless direct current motor counter electromotive force phase point detecting method
  • Brushless direct current motor counter electromotive force phase point detecting method
  • Brushless direct current motor counter electromotive force phase point detecting method

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Embodiment Construction

[0018] see Figure 1 to Figure 4 , the brushless DC motor counter electromotive force commutation point detection method, including the following four steps:

[0019] Step 1: Connect the three stator windings of the motor to the control power supply Apply voltage to the three stator windings of the motor so that after each commutation one winding is connected to the positive pole of the control power supply and the second winding is connected to the control power supply and the third is in a de-energized state; that is, the current flows in from the winding connected to the positive pole of the power supply, flows out from the winding connected to the negative pole of the power supply, the third winding is in a de-energized state, and only two of the three phases of the motor A voltage is applied to the phase;

[0020] Step 2: Detect the ground terminal voltages Va, Vb and Vc of the three stator windings, and the counter electromotive force E=(Va+Vb+Vc)-3Vdc / 2; where, Vdc is ...

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Abstract

The invention discloses a brushless direct current motor counter electromotive force phase point detecting method. The method comprises the following steps of: connecting three stator windings of a motor onto a control power supply to apply a voltage to the three stator windings of the motor to ensure that one winding is connected to the positive electrode of the control power supply after the reversing is carried out every time; connecting a second winding to the negative electrode of the control power supply; ensuring that a third winding is in a power-losing state; detecting voltages Va, Vb and Vc at the grounding ends of the three stator windings to ensure that the counter electromotive force E is equal to (Va+Vb+Vc)-3Vd<c / 2>; judging a zero crossing point of the counter electromotive force of a brushless direct current motor according to the change of the positive electrode and the negative electrode of the counter electromotive force; and delaying an electric angle of 30 degrees from the zero crossing point of the counter electromotive force of the brushless direct current motor to obtain a phase change point. The brushless direct current motor counter electromotive force phase point detecting method has the advantages of low cost and high detection reliability, an external comparator is not needed, and the safety reliability of operation of the motor is improved.

Description

technical field [0001] The invention relates to a method for detecting a commutation point of a counter electromotive force of a brushless direct current motor. Background technique [0002] Brushless motors overcome the shortcomings of brushed motors such as complex structure, noise, sparks and difficult maintenance, and are widely used for their advantages of simple structure, reliable operation, high efficiency and energy saving, and easy control. When the brushless DC motor is running, it needs the position signal of the rotor to control the commutation of the power tube in the inverter, so as to realize the synchronous operation of the stator magnetic field and the rotor. According to the method of obtaining the rotor position signal, brushless motors can be divided into two types: position sensorless and position sensor. Because the position sensor is not only complicated to install, but also has high hardware costs, the sensor itself has defects such as insufficient a...

Claims

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Application Information

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IPC IPC(8): H02P6/18H02P6/182
Inventor 徐鸿王泰宇杨来坡
Owner ANHUI ZHONGJIA ZHIRUI TECH
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