Motor overcurrent protection circuit with anti-blocking and protection current linearly increasing with output power
An overcurrent protection circuit, linear increase technology, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve problems such as speed reduction, motor load increase, safety accidents, etc.
Pending Publication Date: 2018-11-16
GUIZHOU AEROSPACE LINQUAN MOTOR CO LTD
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Problems solved by technology
However, in the use of brushless DC motors, the load of the motor increases and the speed decreases due to bearing failure and clogging of excess objects. Since the output power remains constant and the commutation current of the windings increases, the filter capacitor of the busbar will bear the ripple beyond its limit. Wave current, causing the bus filter capacitor to overheat and burst, and cause a safety accident
Method used
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Embodiment
[0056] Example: Take a certain type of brushless motor and controller of the company as a prototype, fix the motor on the supporting tooling, apply the rated load to start the motor, and then reduce the resistance of the load resistance to the short-circuit load resistance, the motor speed, the operating current And the output power decreases linearly at the same time. Due to the reduction of power, the ripple current of the bus filter capacitor decreases together, the capacitor works stably, and the problem of overheating and bursting no longer occurs.
[0057] In order to verify the locked-rotor protection performance of the circuit, fix the motor on a rigid bracket, install a torque rod on the motor shaft, and push the torque rod on the table in a clockwise direction from the shaft extension end, and turn on the power to ensure that the motor works for a long time. In the locked rotor condition, the locked rotor current of the brushless motor and the controller is 6.3A, and ...
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The invention provides a motor overcurrent protection circuit with anti-blocking and protection current linearly increasing with output power, which comprises a PWM control circuit, a driving circuit,an inverter circuit, an overcurrent comparison circuit, a filter circuit, a blocking and rotational speed weighted composite processing circuit, a filter isolation processing circuit, a rotational speed detection circuit and an isolation processing circuit. The invention can reliably protect the power device and the motor under the condition that the motor is blocked for a long time and the motorload is abnormally increased, and the circuit linearly adjusts the current protection comparison value of the controller by collecting the motor speed and the input value set by the blocking, so thatthe curve of the current protection value linearly increasing with the motor speed is a straight line.
Description
technical field [0001] The invention relates to a motor overcurrent protection circuit which is anti-blocking and whose protection current increases linearly with the output power. Background technique [0002] The overcurrent protection of the existing brushless DC motor is to select 1.3 to 1.5 times the rated operating current as the overcurrent protection value. When the current exceeds the protection value, the output is turned off to keep the motor operating current constant and protect the motor. This protection method It can effectively protect the motor from overloading during normal operation of the motor. However, in the use of brushless DC motors, the load of the motor increases and the speed decreases due to bearing failure and clogging of excess objects. Since the output power remains constant and the commutation current of the windings increases, the filter capacitor of the busbar will bear the ripple beyond its limit. The wave current will cause the bus filte...
Claims
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Login to View More IPC IPC(8): H02H7/085
CPCH02H7/085
Inventor 郑浩何苗郑自伟曾庆军夏雍
Owner GUIZHOU AEROSPACE LINQUAN MOTOR CO LTD