A detection method for brake failure of motor brake system
A technology of motor holding brake and detection method, which is applied in measuring devices, force/torque/work measuring instruments, instruments, etc., can solve the problems of heavy objects falling, closed-loop control of motor holding brakes, lack of feedback information, etc., to ensure safety. , Guarantee the effect of comprehensiveness and security
Active Publication Date: 2020-06-19
清能德创电气技术(北京)有限公司
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Problems solved by technology
However, this digital output circuit belongs to open-loop control and does not perform closed-loop control on the actual state of the motor brake. Because it is not a closed-loop control and lacks corresponding feedback information, the motor brake control circuit in the prior art, or the external brake When the brake auxiliary circuit or the motor brake is abnormal, especially when the brake circuit is abnormal, the servo system will face safety problems (such as heavy objects falling)
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[0014] The present invention is specifically described as follows in conjunction with specific embodiments:
[0015] In the present invention, the method for testing the failure of the motor brake system is as follows: when the servo system needs to be stopped, the servo driver first switches to the speed mode, controls the motor to stop, and after the motor stops, records the current motor torque TL, and then switches When the drive is in torque mode, the torque command value is equal to TL. Then control the motor brake to make it in the braking state, and start the detection timer. Before the detection timer expires, the torque command value is gradually reduced, and at the same time, the change of the position error is recorded in real time, and whether to continue to reduce the torque command value is determined according to the change of the position error, thereby forming a closed-loop control.
[0016] If the position error exceeds the set threshold at a certain moment...
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The invention aims at providing a detection method for a braking failure of a motor band-type brake system. According to the detection method, a motor band-type brake unit is controlled to be in a braking state and a torque instruction value is reduced gradually; a position error change is recorded; if a position error at a certain time exceeds a set threshold, a motor band-type brake failure mark is set and a current position value is recorded; and a driver is switched to be in a position mode and the detection process is completed, so that the motor band-type brake failure position is determined. With the detection method, comprehensiveness of motor band-type brake failure detection as well as security of a load in a detection process is guaranteed.
Description
technical field [0001] The invention relates to the field of servo motors, in particular to the field of detection of a motor brake system. Background technique [0002] Servo motor (servo motor) refers to the engine that controls the operation of mechanical components in the servo system, and is an auxiliary motor indirect transmission device. The servo motor can control the speed and position accuracy very accurately, and can convert the voltage signal into torque and speed to drive the control object. The rotor speed of the servo motor is controlled by the input signal and can respond quickly. In the automatic control system, it is used as an actuator, and has the characteristics of small electromechanical time constant, high linearity, and starting voltage. It can convert the received electrical signal Converted to angular displacement or angular velocity output on the motor shaft. It is divided into two categories: DC and AC servo motors. Its main feature is that ther...
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IPC IPC(8): G01L5/28
CPCG01L5/284
Inventor 刘葵刘波汤小平
Owner 清能德创电气技术(北京)有限公司