Motor with RPM pickup via a hall sensor

• US 6,127,752 A
• Filed: 10/07/1998
• Issued: 10/03/2000
• Est. Priority Date: 03/12/1997
• Status: Expired due to Fees

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Wiesler, Martin
• Primary Examiner(s): Ramirez, Nestor
• Assistant Examiner(s): Mullins, Burt
• Application Number:
  US09/155,847
• Time in Patent Office: 727 Days
• Field of Search: 310/68 B, 310/DIG. 3, 310/DIG. 6, 310/238, 310/239, 310/71
• US Class Current: 310/68.00B
• CPC Class Codes: B60J 7/0573 power driven arrangements, e.g. electrical
• CPC Class Codes: G01P 3/487 delivered by rotating magnets
• CPC Class Codes: H02K 11/21 Devices for sensing speed or position, or actuated thereby specially adapted for machines having non-mechanical commutating devices H02K29/06, H02K29/14
• CPC Class Codes: H02K 11/215 Magnetic effect devices, e.g. Hall-effect or magneto-resistive elements
• CPC Class Codes: H02K 2205/06 Machines characterised by means for keeping the brushes in a retracted position during assembly
• CPC Class Codes: H02K 2211/03 Machines characterised by circuit boards, e.g. pcb
• 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: H02K 5/225 Terminal boxes or connection arrangements specially adapted for submersible motors H02K5/132
• CPC Class Codes: H02K 7/1166 comprising worm and worm-wheel structural association with bearings specially adapted for worm gear drives H02K7/081
• CPC Class Codes: Y10S 310/03 Hall effect generators and converters
• CPC Class Codes: Y10S 310/06 Printed-circuit motors and components

Abstract

The invention is based on an electrically operated motor, having a shaft with a magnet rotor body, the RPM of the shaft can be picked up by a Hall sensor disposed on a circuit board. The circuit board is embodied with soldered pins or contact shoes and is integrated into a component of the motor, and that contacts, supply and signal lines for the circuit board are injected and/or plugged into the component of the motor.

Claims

1. An electrically operated motor, comprising a rotatable shaft (1) with a magnet rotor body (2), the RPM of said shaft is detected by a Hall sensor (3) disposed on a circuit board (4), the circuit board (4) is embodied with soldered pins (5) which are disposed on the circuit board (4) and are integrated into a brush holder (7) of the motor, and contacts (8), power supply lines and signal lines (9) for the circuit board (1) are fixed by at least one fastening injection and plugged into the brush holder (7) of the motor.

2. The motor of claim 1, in which the brush holder (7) and a bearing cap (12) are one piece.

3. The motor of claim 1, in which the power supply lines and signal lines (9) of the circuit board (4) terminate in a plug (11), which is molded onto the brush holder (7) of the motor.

4. The motor of claim 3, in which the brush holder (7) and a bearing cap (12) are one piece.

5. The motor of claim 3, in which the Hall sensor (3) is disposed with slight play in a radial direction relative to the magnet rotor body (2).

6. The motor of claim 3, in which the Hall sensor (3) is oriented parallel to an axis (15) to the shaft.

7. The motor of claim 3, in which the Hall sensor (3) is mounted on the circuit board (4) by a surface mounting device.

8. The motor of claim 3, in which the magnet rotor body (2) includes a magnet (16) containing neodymium.

9. The motor of claim 3, in which the magnet rotor body (2) includes a plastic carrier (17) with a ring magnet (16) sprayed onto the plastic carrier.

10. The motor of claim 3, in which the magnet rotor body (2) is fixed on the shaft (1) by a press fit (18).

11. The motor of claim 3, in which the magnet rotor body (2) is disposed upstream and in which the magnet rotor body (2) is disposed between a bearing (23) of the rotatable shaft (1) and the brushes (13) of the brush holder (7) and has a chamfer (14) which is used as a thrust cone for the brushes.

12. The motor of claim 1, in which the magnet rotor body (2) is disposed upstream and in which the magnet rotor body (2) is disposed between a bearing (23) of the rotatable shaft (1) and the brushes (13) of the brush holder (7) and has a chamfer (14) used as a thrust cone for the brushes.

13. The motor of claim 1, in which the Hall sensor (3) is disposed with slight play in a radial direction relative to the magnet rotor body (2).

14. The motor of claim 1, in which the Hall sensor (3) is oriented parallel to an axis (15) of the shaft.

15. The motor of claim 1, in which the Hall sensor (3) is mounted on the circuit board (4) by a surface mounting device process.

16. The motor of claim 1, in which the magnet rotor body (2) includes a magnet (16) containing neodymium.

17. The motor of claim 1, in which the magnet rotor body (2) includes a plastic carrier (17) with a ring magnet (16) sprayed onto the plastic carrier.

18. The motor of claim 1, in which the magnet rotor body (2) is fixed on the shaft (1) by a press fit (18).

19. The motor of claim 18, in which only the plastic carrier (17) has a press fit.

20. The motor of claim 19, in which the plastic carrier (17) has an internal bore (19) which widens conically so that the internal bore has at least two diameters (27, 28) and the magnet (16) is disposed on the plastic carrier (17) on one side, in which a first diameter (27) is larger than a second diameter (28) on a face end side (21).

21. The motor of claim 20, in which a tension of the press fit (18) of the plastic carrier (17) to the shaft (1) is great enough so that the carrier is not lifted by fluctuations in an operating temperature.

22. The motor of claim 20, in which a tension of the press fit (18) of the plastic carrier 17 to the shaft (1) is great enough so that the carrier is not lifted by fluctuations in an operating temperature.

23. An electrically operated motor, comprising a rotatable shaft (1) with a magnet rotor body (2), the RPM of said shaft is detected by a Hall sensor (3) disposed on a circuit board (4), the circuit board (4) is embodied with contact shoes (6) which are disposed on the circuit board and are integrated into a brush holder (7) of the motor, and contacts (8), supply lines and signal lines (9) for the circuit board (1) are fixed by at least one fastening injection and plugged into the brush holder (7) of the motor.

24. The motor of claim 23, in which the brush holder (7) and a bearing cap (12) are one piece.

25. The motor of claim 23, in which the magnet rotor body (2) is disposed upstream and in which the magnet rotor body (2) is disposed between a bearing (23) of the rotatable shaft (1) and the brushes (13) of the brush holder (7) and has a chamfer (14) used as a thrust cone for the brushes.

26. The motor of claim 23, in which the Hall sensor (3) is disposed with slight play in a radial direction relative to the magnet rotor body (2).

27. The motor of claim 23, in which the Hall sensor (3) is oriented parallel to an axis (15) of the shaft.

28. The motor of claim 23, in which the Hall sensor (3) is mounted on the circuit board (4) by a surface mounted device.

29. The motor of claim 23, in which the magnet rotor body (2) includes a magnet (16) containing neodymium.

30. The motor of claim 23, in which the magnet rotor body (2) includes a plastic carrier (17) with a ring magnet (16) sprayed onto the plastic carrier.

31. The motor of claim 23, in which the magnet rotor body (2) is fixed on the shaft (1) by a press fit (18).

32. The motor of claim 31, in which only the plastic carrier (17) has a press fit.

33. The motor of claim 32, in which the plastic carrier (17) has an internal bore (19) which widens conically so that the internal bore has at least two diameters (27, 28) and the magnet (16) is disposed on the plastic carrier (17) on one side, in which a first diameter (27) is larger than a second diameter (28) on a face end side (21).

34. The motor of claim 23, in which the power supply and signal lines (9) of the circuit board (4) terminate in a plug (11), which is molded onto the brush holder (7) of the motor.

35. The motor of claim 34, in which the brush holder (7) and a bearing cap (12) are one piece.

36. The motor of claim 34, in which the magnet rotor body (2) is disposed upstream and in which the magnet rotor body (2) is disposed between a bearing (23) of the rotatable shaft (1) and the brushes (13) of the brush holder (7) and has a chamfer (14) which is used as a thrust cone for the brushes.

37. The motor of claim 34, in which the Hall sensor (3) is disposed with slight play in a radial direction relative to the magnet rotor body (2).

38. The motor of claim 34, in which the Hall sensor (3) is oriented parallel to an axis (15) of the shaft.

39. The motor of claim 34, in which the Hall sensor (3) is mounted on the circuit board (4) by a surface mounted device.

40. The motor of claim 34, in which the magnet rotor body (2) includes a magnet (16) containing neodymium.

41. The motor of claim 34, in which the magnet rotor body (2) includes a plastic carrier (17) with a ring magnet (16) sprayed onto the plastic carrier.

42. The motor of claim 34, in which the magnet rotor body (2) is fixed on the shaft (1) by a press fit (18).