Driver of brushless electric machine and circuit thereof

Abstract

The invention relates to a driver of a brushless electric machine. The driver of the brushless electric machine comprises a shell body, a control circuit board internally arranged in the shell body, a control output interface formed in the shell body and a power source connecting wire. The control circuit board comprises a power source circuit and an electric machine starting control unit, wherein the electric machine starting control unit comprises a driving circuit and a control single chip microcomputer. The control circuit board further comprises a power type NTC thermistor with negative temperature coefficients, wherein the power type NTC thermistor is connected between the power source circuit and the electric machine starting control unit in series. Therefore, when the brushless electric machine is started, currents are started to pass through the power type NTC thermistor, the power type NTC thermistor restrains the impact (surge) of the currents, only small currents flow into an electric machine winding, damage of devices in the control circuit board is avoided, and the starting of the electric machine is safer. When starting is finished, under the action of the currents, the temperature of the power type NTC thermistor rises, and therefore the resistance value of the power type NTC thermistor is decreased, and the normal currents of the electric machine are not influenced.

Description

Technical field [0001] The present invention relates to the field of brushless motor control, in particular to a brushless motor driver. The control circuit board in the brushless motor driver includes a power NTC thermistor with a negative temperature coefficient. The power NTC thermal resistor The sensitive resistor is connected in series between the power circuit and the motor start control unit. The invention also relates to a safe starting circuit for a brushless motor. The circuit also includes a power NTC thermistor with a negative temperature coefficient. The power NTC thermistor is connected in series between the power supply circuit and the motor starting control unit. Realize the function of controlling the starting current. Background technique [0002] Brushless motors have simple control, low cost, and no carbon powder pollution, and have gradually become the mainstream of the market. However, when the brushless motor is working, the controller is the brushless mo...

AI Technical Summary

Problems solved by technology

[0003] However, this kind of brushless motor has a large current at the moment of starting, which is easy to cause the circuit components to be burned, especially the repeated start of the brushless motor, which causes the current in the controller or the circuit to be too large for many times, and it is easy to burn out parts of the controller. components, or even cause a fire

As a result, brushless motors cannot be effectively used in products

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