Braking apparatus having function of detecting brake actuation and release faults

Patent metadata

Field	Value
Publication number	US-10027259-B2
Application number	US-201615217089-A
Country	US
Kind code	B2
Filing date	Jul 22, 2016
Priority date	Jul 31, 2015
Publication date	Jul 17, 2018
Grant date	Jul 17, 2018

Abstract

A braking apparatus according to one embodiment of the present invention is a braking apparatus for use in an electrical motor, and comprises a braking unit which locks the electrical motor in position, a voltage detection unit which detects a voltage applied to the braking unit, and an observing unit which recognizes a voltage variation pattern and, based on the voltage variation pattern, observes the released and actuated states of the braking unit.

First claim

The invention claimed is:

1. A braking apparatus for use in an electrical motor, comprising:
a braking unit for keeping position of the electrical motor;
a voltage detection unit positioned between the braking unit and a power supply controlled by a power switch, the voltage detection unit for detecting a voltage applied to the braking unit by the power supply; and
an observing unit for recognizing variation patterns of the voltage, and based on the variation patterns of the voltage, observing released and actuated states of the braking unit, by identifying:
a broken wire between the voltage detection unit and the power supply based on a first pattern of the variation patterns in the detected voltage, the first pattern includes: 1) either a voltage increase or an unchanged voltage when the brake is released, or 2) an unchanged voltage when the brake is actuated,
a broken wire between the voltage detection unit and the braking unit based on a second pattern of the variation patterns in the detected voltage, the second pattern includes either a voltage increase when the brake is released, or a voltage decrease when the brake is actuated, and
a fused state of the power switch based on a third pattern of the variation patterns in the detected voltage, the third pattern includes: 1) either a voltage increase or an unchanged positive voltage when the brake is released, or 2) an unchanged positive voltage when the brake is actuated.

2. The braking apparatus according to claim 1 , wherein a fault is detected in the releasing or actuation of the braking unit, the observing unit localizes a fault site based on the variation pattern of the voltage.

3. The braking apparatus according to claim 1 , wherein the voltage detection unit converts the voltage into a detectable signal.

Assignees

• Fanuc Corp

Inventors

• Ono Katsuya
• Tamaki Takeshi

Classifications

• H02K2213/06

  Machines characterised by the presence of fail safe, back up, redundant or other similar emergency arrangements · CPC title

• F16D1/00

  Couplings for rigidly connecting two coaxial shafts or other movable machine elements (attachment of wheels to axles for railway carriages B60B; for attachment of cranks to their shafts F16C3/10) · CPC title

• H02K11/20

  for measuring, monitoring, testing, protecting or switching (rectifiers H02K11/04; power electronics H02K11/33) · CPC title

• H02P3/08 Primary

  for stopping or slowing a DC motor · CPC title

• H02P3/06 Primary

  for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter · CPC title