CIRCUIT ARRANGEMENT FOR AN ELECTROMAGNETIC HOLDING BRAKE

• US 20170063259A1
• Filed: 08/11/2016
• Published: 03/02/2017
• Est. Priority Date: 08/28/2015
• Status: Active Grant

• Current Assignee: Dr. Johannes Heidenhain GmbH
• Original Assignee: Dr. Johannes Heidenhain GmbH
• Inventors: Schoenlinner, Markus, von Le Suire, Christian
• Granted Patent: US 9,847,741 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: B60T 13/04 by spring or weight fluid released B60T13/10
• CPC Class Codes: B60T 13/743 with a spring accumulator
• CPC Class Codes: B60T 13/748 acting on electro-magnetic brakes combined with fluid-pressure brake systems B60T13/667
• CPC Class Codes: F16D 2121/14 Mechanical
• CPC Class Codes: F16D 2121/22 for releasing a normally applied brake
• CPC Class Codes: F16D 65/18 adapted for drawing members together , e.g. for disc brakes
• CPC Class Codes: F16D 65/186 with full-face force-applying member, e.g. annular
• CPC Class Codes: H02P 29/00 Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors arrangements for starting electric motors H02P1/00; arrangements for stopping or slowing electric motors H02P3/00; control of motors that can be connected to two or more different electric power supplies H02P4/00; regulating or controlling the speed or torque of two or more electric motors H02P5/00; vector control H02P21/00
• CPC Class Codes: H02P 3/04 Means for stopping or slowing by a separate brake, e.g. friction brake or eddy-current brake
• CPC Class Codes: Y02T 10/72 Electric energy management in electromobility

Abstract

A circuit arrangement is configured to supply an electromagnetic holding brake of an electric motor with an operating voltage for releasing the holding brake, and a voltage that is reduced relative to the operating voltage for holding the holding brake in the released position. The operating voltage is supplied from a higher-level control system disposed separately from the motor and the holding brake. The circuit arrangement is disposed in or on the motor or in or on the holding brake and includes a voltage regulator adapted to regulate, independently of the operating voltage, the reduced voltage to a fixed value after the holding brake is released.

Claims

1. A circuit arrangement configured to supply an electromagnetic holding brake of an electric motor with an operating voltage for releasing the holding brake, and a voltage that is reduced relative to the operating voltage for holding the holding brake in the released position, wherein the operating voltage is supplied from a higher-level control system disposed separately from the motor and the holding brake, and wherein the circuit arrangement is disposed in or on the motor or in or on the holding brake and includes a voltage regulator adapted to regulate, independently of the operating voltage, the reduced voltage to a fixed value after the holding brake is released.

2. The circuit arrangement as recited in claim 1, wherein the circuit arrangement includes a comparator configured to compare a reference voltage with a voltage that is tapped from the holding brake and made available via a voltage divider, and to produce at an output a pulse-width modulated signal capable of controlling a switching element via which the operating voltage is applied to the holding brake in a clocked manner so as to produce, on average, the holding voltage.

3. The circuit arrangement as recited in claim 2, wherein the voltage tapped from the holding brake is converted to a triangular voltage by a smoothing capacitor.

4. The circuit arrangement as recited in claim 2, wherein the output of the comparator is coupled back to the reference voltage.

5. The circuit arrangement as recited in claim 2, wherein the reference voltage is derived from the operating voltage via a Zener diode.

6. The circuit arrangement as recited in claim 2, wherein the comparator is connected, at an input for the tapped voltage, to a starting capacitor in such a way that the pulse-width modulated signal is not emitted at the output of the comparator until the starting capacitor is sufficiently charged, and wherein, as a result, the holding brake is initially supplied with the full amount of the operating voltage after the operating voltage is applied to the circuit arrangement, the starting capacitor being dimensioned such that an amount of time required to be sufficiently charged is sufficient to release the holding brake.

7. The circuit arrangement as recited in claim 6, further comprising a discharge diode configured to discharge the starting capacitor in a state in which no operating voltage is applied to the circuit arrangement.

8. The circuit arrangement as recited in claim 1, wherein the circuit arrangement uses the higher potential of the operating voltage as a reference potential, and wherein the switching element is configured as an n-channel MOSFET connecting a negative terminal of the holding brake to the lower potential of the operating voltage.

9. The circuit arrangement as recited in claim 1, further comprising a free-wheeling switching element configured to block a free-wheeling current through the holding brake in a state in which no operating voltage is applied to the circuit arrangement.

10. The circuit arrangement as recited in claim 9, further comprising a suppressor diode connected in parallel with the free-wheeling switching element.