A DC brushless motor starting protection circuit

Abstract

The invention relates to a motor control system, in particular to a starting protection circuit for a brushless DC motor; it solves the problem that when most of the starting circuits of the existing DC brushless motor directly start the motor, the starting current is too large, which may easily lead to poor operation of the device and cause logic Wrong technical question. A method for starting and protecting a brushless DC motor, comprising the following steps: step 1) setting a short-circuit protection current limit value A and an overload protection current limit value B; step 2) setting a board-level temperature limit value C; step 3) turning on the motor; step 4) Measure the current value on the main road of the brushless DC motor power supply; step 5) collect the current signal, and judge whether the current signal value reaches the short-circuit protection current limit A; step 6) judge whether the current signal value reaches the overload protection current limit value B; step 7) collect the board-level temperature value, and judge whether the temperature value reaches the board-level temperature limit value C. At the same time, the invention also provides a DC brushless motor starting protection circuit.

Description

technical field [0001] The invention relates to a motor control system, in particular to a starting protection circuit for a DC brushless motor. Background technique [0002] A brushless DC motor is a device that converts DC electrical energy into mechanical energy. DC brushless motors are divided into DC brushless motors and DC brushed motors. The emergence of brushless DC motors is based on the development of power switch technology and permanent magnet synchronous technology. Since brushless DC motors use Hall sensors to transmit the position of the rotor, they have no brushes, no interfaces, no noise, and long service life. Most of the DC brushless motors used in the industry are brushless. [0003] There are generally three ways to start a brushless DC motor: the first is step-down starting, which consumes less energy and starts smoothly, but requires special power supply equipment; the second is starting with series resistors in the armature circuit, which consumes m...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the technical problem that most of the existing DC brushless motor starting circuits directly start the motor, because the starting current is too large, it is easy to cause poor operation of the device and cause logic errors, the present invention provides a DC brushless motor starting protection circuit

Images