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DC brushless motor starting protection method and circuit

A brushless DC motor and starting protection technology, which is applied in the direction of emergency protection circuit devices, electrical components, starting devices, etc., can solve problems such as logic errors, excessive starting current, and poor operation of devices, and achieve accurate current measurement and control Effect of Reliable, Excellent Common-Mode Rejection Ratio

Active Publication Date: 2019-12-10
XIAN FASHITE AUTOMOBILE TRANSMISSION CO LTD
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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, due to the excessive starting current, it is easy to cause poor operation of the device and lead to logic errors, the present invention provides a DC brushless motor starting protection method and circuit

Method used

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  • DC brushless motor starting protection method and circuit
  • DC brushless motor starting protection method and circuit
  • DC brushless motor starting protection method and circuit

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Embodiment Construction

[0042] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0043] refer to figure 1 , the starting protection method of the brushless DC motor, comprising the following steps:

[0044]Step 1) Set the short-circuit protection current limit A and the overload protection current limit B, where A>B;

[0045] Step 2) setting board-level temperature limit C;

[0046] Step 3) Turn on the motor;

[0047] Step 4) measure the current value on the main road of the brushless DC motor power supply;

[0048] Step 5) collect the current signal obtained in step 4), and compare the current signal with the short-circuit protection current limit value A; if the current signal value is greater than or equal to the short-circuit protection current limit value A, then disconnect the circuit; if the current If the signal value is less than the short-circuit protection current limit value A, then enter step 6);

[0049] ...

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Abstract

The invention relates to a motor control system, in particular to a DC brushless motor starting protection method and circuit. The technical problem that most of existing DC brushless motor starting circuits start motors directly and logic errors can be caused by poor operation of devices due to an excessive starting current is solved. The DC brushless motor starting protection method comprises the following steps: (1) setting a short-circuit protection current limit value A and an overload protection current limit value B; (2) setting a board-level temperature limit value C; (3) starting a motor; (4) measuring a current value on a power supply trunk line of the DC brushless motor; (5) collecting a current signal, and judging whether the value of the current signal reaches the short-circuit protection current limit value A or not; (6) judging whether the value of the current signal reaches the overload protection current limit value B or not, and (7) collecting a board-level temperature value and judging whether the temperature value reaches the board-level temperature limit value C or not. The invention further 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 method and circuit of 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/20H02H7/08H02H7/085
CPCH02H1/0007H02H7/0816H02H7/085H02H7/0852H02P6/20
Inventor 白遴杰王建军马东闯
Owner XIAN FASHITE AUTOMOBILE TRANSMISSION CO LTD
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