Motor power-off brake system and method

Abstract

A motor power-off brake system and method are used for solving the problem that surge is caused by switching operation of an existing motor power-off brake to damage a motor coil winding. The brake system comprises a power supply; a driving circuit electrically connected with the power supply; a motor coil electrically connected with the driving circuit; a voltage sensing module electrically connected with the power supply and used for measuring the voltage of the power supply and generating a monitoring voltage value; and a control module electrically connected with the driving circuit and the voltage sensing module and used for receiving the monitoring voltage value. The control module judges that the power supply is about to be powered off according to the monitoring voltage value, a control signal is generated through the control module, the driving circuit and the motor coil are switched to form an open circuit and the open circuit is maintained for a period of time, and the driving circuit and the motor coil are switched to form a closed loop.

Description

technical field [0001] The invention relates to a method for protecting a power system, in particular to a motor power-off braking system and method for preventing damage to circuit components caused by surges. Background technique [0002] In the power system, the switching surge (Switching Surge) caused by the switching operation is the instantaneous voltage wave or instantaneous current wave caused by the energy storage components (inductance and capacitance) in the circuit at the moment of cutting off or turning on the circuit. The surge usually only exists in the circuit for a few microseconds (microsecond, μs, that is, one millionth of a second), and the amplitude of the surge is often tens or hundreds of times of the normal amplitude. Therefore, the instantaneous high Energy impact will cause circuit overload, and it is too late for general circuit protection components to respond. [0003] Generally, the coil windings and coupling cores of motors contain insulating ...

AI Technical Summary

Problems solved by technology

[0003] Generally, the coil winding and coupling iron core of the motor include insulating components. When the motor is powered off and brakes to stop and a switching surge occurs, the high voltage or current exceeding the motor specification may damage the insulating component on the component, resulting in a short circuit of the coil winding.

Therefore, the motor repeatedly starts and stops switching and receives surge interference for a long time, which will cause damage to the coil winding of the motor and reduce the service life of the circuit components

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