Brake diagnosis device and brake diagnosis method

Patent metadata

Field	Value
Publication number	US-2016156288-A1
Application number	US-201514952841-A
Country	US
Kind code	A1
Filing date	Nov 25, 2015
Priority date	Nov 28, 2014
Publication date	Jun 2, 2016
Grant date	—

Abstract

This disclosure discloses a brake diagnosis device configured to diagnose a brake of a motor with a brake. The brake diagnosis device includes a brake control part, a diagnosis part, and a signal output part. The brake control part is configured to actuate or release the brake. The diagnosis part is configured to diagnose a presence or absence of an abnormality of the brake while the brake is actuated by the brake control part. The signal output part is configured to output a signal related to a brake abnormality after the brake is released by the brake control part in a case that the diagnosis part diagnoses the brake as having an abnormality.

First claim

What is claimed is:

1 . A brake diagnosis device comprising:
a brake control part configured to actuate or release a brake of a motor with the brake; a diagnosis part configured to diagnose a presence or absence of an abnormality of the brake while the brake is actuated by the brake control part; and a signal output part configured to output a signal related to a brake abnormality after the brake is released by the brake control part in a case that the diagnosis part diagnoses the brake as having an abnormality.

2 . The brake diagnosis device according to claim 1 , wherein:
the brake control part releases the brake when the diagnosis part diagnoses that the brake has an abnormality.

3 . The brake diagnosis device according to claim 2 , wherein:
the diagnosis part includes: a calculating part configured to calculate, based on a detection position input from a position detector configured to detect a motor position of the motor, a movement amount of the motor position from a diagnosis start position; and a determination part configured to compare the movement amount calculated by the calculation part with a threshold value and to determine the presence or absence of an abnormality of the brake.

4 . The brake diagnosis device according to claim 3 , further comprising:
a position control part configured to generate a velocity command based on a position command and the detection position; and a position command output part configured to output to the position control part a first position command for moving the motor position by a predetermined amount from the diagnosis start position while the brake is actuated by the brake control part.

5 . The brake diagnosis device according to claim 4 , further comprising:
a speed control part configured to generate a torque command based on the velocity command and a detection speed based on the detection position; and a torque limitation part configured to start torque limitation for limiting a command torque of the torque command to a torque limitation value or less in a case that the position command output part starts outputting the first position command, and to cancel the torque limitation in a case that the position command output part stops outputting the first position command.

6 . The brake diagnosis device according to claim 5 , wherein:
the position command output part stops the output of the first position command in a case that the diagnosis part diagnoses the brake as having an abnormality during output of the first position command.

7 . The brake diagnosis device according to claim 6 , wherein:
after the output of the first position command is stopped and the brake control part releases the brake, the position command output part outputs to the position control part a second position command for returning the motor position to the diagnosis start position.

8 . The brake diagnosis device according to claim 7 , wherein:
the signal output part outputs the signal related to a brake abnormality when the detection position reaches the diagnosis start position.

9 . The brake diagnosis device according to claim 8 , further comprising:
a timer part configured to count a time elapsed from a time point of actuation of the brake by the brake control part, and the position command output part starts outputting the first position command when the timer part has counted the elapse of the first waiting time.

10 . The brake diagnosis device according to claim 9 , wherein:
the timer part counts a time elapsed from a time point of release of the brake B by the brake control part, and the position command output part starts outputting the second position command when the timer part has counted the elapse of a second waiting time.

11 . A brake diagnosis method comprising:
actuating a brake of a motor with the brake, diagnosing a presence or absence of an abnormality of the brake in an actuated state of the brake, releasing the brake in a case that the brake is diagnosed as having an abnormality, and outputting a signal related to a brake abnormality after release of the brake.

12 . A brake diagnosis device comprising:
means for actuating a brake of a motor with the brake, means for diagnosing a presence or absence of an abnormality of the brake in an actuated state of the brake, means for releasing the brake in a case that the brake is diagnosed as having an abnormality, and means for shifting the motor with the brake to normal operation after release of the brake.

Assignees

• Yaskawa Denki Seisakusho Kk

Inventors

• Sawamura Mitsujiro
• Watanabe Junichi
• Horimai Daichi

Classifications

• H02P3/04 Primary

  Means for stopping or slowing by a separate brake, e.g. friction brake or eddy-current brake · CPC title

• B25J19/0004

  Braking devices (brakes in general F16D) · CPC title

• G01M13/00 Primary

  Testing of machine parts · CPC title

• F16D2055/0058

  Fully lined, i.e. braking surface extending over the entire disc circumference · CPC title

• H02P3/00

  Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters (stopping of synchronous motors with electronic commutators H02P6/24; stopping dynamo-electric motors rotating step by step H02P8/24; vector control H02P21/00) · CPC title