Sensor for motor

Patent metadata

Field	Value
Publication number	US-9857202-B2
Application number	US-201615159193-A
Country	US
Kind code	B2
Filing date	May 19, 2016
Priority date	May 28, 2015
Publication date	Jan 2, 2018
Grant date	Jan 2, 2018

Abstract

A sensor for motor includes: a detected plate mounted to a rotating shaft of a motor, the detected plate including a plurality of rod-shaped portions having different lengths from one another, the plurality of rod-shaped portions radially projecting from the rotating shaft; a detecting member configured to output a signal having a waveform that changes according to the rod-shaped portions passing through a front of the detecting member; and a movable member that holds the detecting member.

First claim

What is claimed is:

1. A sensor for motor comprising:
a detected plate mounted to a rotating shaft of a motor, the detected plate including a plurality of rod-shaped portions having different lengths from one another, the plurality of rod-shaped portions radially projecting from the rotating shaft, the plurality of rod-shaped portions rotating with the rotating shaft about an axis of the rotating shaft;
a detecting member configured to output a signal having a waveform that changes according to the rod-shaped portions passing through a front of the detecting member; and
a movable member that holds the detecting member,
wherein when the plurality of rod-shaped portions rotates with the rotating shaft about the axis of the rotating shaft, at least one of the plurality of rod-shaped portions pass through the front of the detecting member.

2. The sensor for motor according to claim 1 , wherein
the movable member moves such that a count of the rod-shaped portions passing through the front of the detecting member is changeable.

3. The sensor for motor according to claim 1 , further comprising
a ring-shaped permanent magnet mounted to the rotating shaft to overlap the detected plate, wherein
the detected plate is formed of an electromagnetic steel plate, and
the detecting member is a Hall element configured to magnetically detect a passing of the rod-shaped portion of the detected plate.

4. The sensor for motor according to claim 2 , further comprising
a ring-shaped permanent magnet mounted to the rotating shaft to overlap the detected plate, wherein
the detected plate is formed of an electromagnetic steel plate, and
the detecting member is a Hall element configured to magnetically detect a passing of the rod-shaped portion of the detected plate.

5. The sensor for motor according to claim 1 , wherein
the movable member is a cover member mounted to a housing of the motor to cover the detected plate.

6. The sensor for motor according to claim 2 , wherein
the movable member is a cover member mounted to a housing of the motor to cover the detected plate.

7. The sensor for motor according to claim 3 , wherein
the movable member is a cover member mounted to a housing of the motor to cover the detected plate.

8. The sensor for motor according to claim 4 , wherein
the movable member is a cover member mounted to a housing of the motor to cover the detected plate.

9. The sensor for motor according to claim 5 , wherein
the movable member has an elongated hole-shaped slit, the movable member being screwed to the housing through the slit.

10. The sensor for motor according to claim 6 , wherein
the movable member has an elongated hole-shaped slit, the movable member being screwed to the housing through the slit.

11. The sensor for motor according to claim 7 , wherein
the movable member has an elongated hole-shaped slit, the movable member being screwed to the housing through the slit.

12. The sensor for motor according to claim 8 , wherein
the movable member has an elongated hole-shaped slit, the movable member being screwed to the housing through the slit.

13. The sensor for motor according to claim 1 , wherein the detecting member is disposed in a direction of the rotating shaft.

14. The sensor for motor according to claim 1 , wherein the movable member vertically moves such that the movable member is away of the rotating shaft.

15. The sensor for motor according to claim 1 , wherein the movable member moves in a direction perpendicular to an axis of the rotating shaft.

16. The sensor for motor according to claim 1 , wherein the detecting member magnetically detects the passing of at least one of the plurality of the rod-shaped portions.

17. The sensor for motor according to claim 1 , wherein the detecting member is a Hall element that magnetically detects the passing of at least one of the plurality of the rod-shaped portions.

18. The sensor for motor according to claim 1 , wherein the detecting member magnetically detects a change in a magnetic field.

19. The sensor for motor according to claim 18 , wherein the waveform changes according to the change in the magnetic field.

20. A sensor for motor comprising:
a detected plate mounted to a rotating shaft of a motor, the detected plate including a plurality of rod-shaped portions having different lengths from one another, the plurality of rod-shaped portions radially projecting from the rotating shaft, the plurality of rod-shaped portions rotating with the rotating shaft about an axis of the rotating shaft;
a detecting member configured to output a signal having a waveform of a magnetic field that changes according to the rod-shaped portions passing through a front of the detecting member; and
a movable member that holds the detecting member,
wherein when the plurality of rod-shaped portions rotates with the rotating shaft about the axis of the rotating shaft, at least one of the plurality of rod-shaped portions pass through the front of the detecting member.

Assignees

• Sanyo Electric Co

Inventors

• Seki Takayoshi

Classifications

• G01D5/145 Primary

  influenced by the relative movement between the Hall device and magnetic fields (see G01R33/06) · CPC title