Cover plate for an electric motor and an electric motor

• US 6,724,122 B2
• Filed: 12/12/2002
• Issued: 04/20/2004
• Est. Priority Date: 12/12/2001
• Status: Expired due to Fees

• Current Assignee: Valeo Motoren Und Aktuatoren GmbH
• Original Assignee: Valeo Motoren Und Aktuatoren GmbH
• Inventors: Schmidt, Harald, Helmich, Johannes, Baeskow, Werner, Frey, Ronald
• Primary Examiner(s): Ponomarenko, Nicholas
• Assistant Examiner(s): Mohandesi, Iraj A.
• Application Number:
  US10/318,974
• Publication Number:
  US 20030107293A1
• Time in Patent Office: 495 Days
• Field of Search: 310/239, 310/68.R, 324/545
• US Class Current: 310/238
• CPC Class Codes: H02K 11/026 Suppressors associated with brushes, brush holders or their supports
• CPC Class Codes: H02K 11/215 Magnetic effect devices, e.g. Hall-effect or magneto-resistive elements
• CPC Class Codes: H02K 11/25 Devices for sensing temperature, or actuated thereby
• CPC Class Codes: H02K 11/33 Drive circuits, e.g. power electronics H02K11/38 takes precedence
• CPC Class Codes: H02K 23/66 Structural association with auxiliary electric devices influencing the characteristic of, or controlling, the machine, e.g. with impedances or switches
• CPC Class Codes: H02K 5/148 Slidably supported brushes
• CPC Class Codes: Y10T 74/19828 Worm

Abstract

A cover plate for an electric motor which has a brush array and interference suppression devices has additional electronic components mounted directly on the cover to determine the speed of the electric motor and for diagnosis. Contact with the interference suppression devices and the additional electronic components is achieved through electrical conductors which are located directly on the cover plate. Flexible use of the electric motor is ensured through the high temperature stability of the cover plate.

Claims

1. A cover plate for an electric motor, comprising:

a brush array;

at least one interference suppression device; and

at least one additional electronic component is earned on the cover plate, the at least one additional electronic component including temperature-sensitive means for providing a temperature-dependant signal for pulse-width modulated control of the electric motor.

2. The cover plate from claim 1, wherein electrical conductors for contacting at least one of the brush array the at least one interference suppression device are one of mounted directly on and integrated into the cover plate.

3. The cover plate of claim 1, wherein electrical conductors for contacting the at least one additional electronic component are carried on the cover plate.

4. The cover plate of claim 1, wherein at least one encoder for determining the speed of the electric motor is carried on the cover plate.

5. The cover plate of claim 4, wherein the at least one encoder is configured as a Hall generator.

6. The cover plate of claim 4, wherein the at least one encoder is mounted so that output signals from the encoder have a phase shift, from which the rotational direction of the electric motor can be determined.

11. The cover plate of claim 1, wherein the temperature stability of the cover plate with the at least one additional electronic component is higher than 160°

C.

13. An electric motor having a cover plate according to claim 1.

18. The cover plate according to claim 1 wherein the temperature-sensitive means comprises a thermistor.

19. The cover plate according to claim 1, further comprising:

a diagnostic circuit for detecting a short circuit in a signal output of an encoder carried on the cover plate.

20. The cover plate according to claim 19 wherein the encoder configured as a Hall generator.

7. A cover plate for an electric motor, comprising:

a brush array;

at least one interference suppression device; and

at least one additional electronic component carried on the cover plate;

wherein the at least one additional electronic component forms a diagnostic circuit.

10. The cover plate of claim 7, wherein a temperature sensor is carried on the cover plate.

12. The cover plate of claim 10, wherein a signal from the temperature sensor is adapted for activating an electric motor.

14. An electric motor having a cover plate according to claim 7.

15. The cover plate of claim 7, wherein the temperature stability of the cover plate with the at least one additional electronic component is higher than 160°

C.

16. The cover plate of claim 7, wherein at least one encoder for determining the speed of the electric motor is carried on the cover plate.

17. The cover plate of claim 16, wherein the at least one encoder is configured as a Hall generator.

8. A cover plate for an electric motor, comprising:

a brush array;

at least one interference suppression device; and

at least one additional electronic component carried on the cover plate;

wherein the at least one additional electronic component forms a diagnostic circuit; and

wherein the diagnostic circuit has at least one voltage divider, where a first node of the voltage divider is connected to a first reference potential in the diagnostic circuit, and a second node of the voltage divider is connected to a second reference potential of the diagnostic circuit.

9. The cover plate of claim 8, wherein a signal output from an encoder is connected to a third node of the voltage divider, and wherein a signal line is connected to a fourth node of the voltage divider.