Motor

Patent metadata

Field	Value
Publication number	US-10396643-B2
Application number	US-201715825228-A
Country	US
Kind code	B2
Filing date	Nov 29, 2017
Priority date	Nov 30, 2016
Publication date	Aug 27, 2019
Grant date	Aug 27, 2019

Abstract

A motor includes a rotational shaft, a bearing supporting the rotational shaft, a magnet including plural magnetic poles in a circumferential direction, a rotor core disposed inside the magnet, and a magnetic sensor. The magnet includes a projection portion projecting toward a side of the bearing with respect to the rotor core in a direction of the rotational shaft. The magnetic sensor is positioned between the rotor core and the bearing in the direction of the rotational shaft and is positioned inside an inner peripheral surface of the projection portion.

First claim

What is claimed is:

1. A motor comprising:
a rotational shaft;
a bearing supporting the rotational shaft;
a magnet including plural magnetic poles in a circumferential direction;
a rotor core disposed inside the magnet; and
a magnetic sensor, wherein
the magnet includes a projection portion projecting toward a side of the bearing with respect to the rotor core in a direction of the rotational shaft, and
the magnetic sensor is positioned between the rotor core and the bearing in the direction of the rotational shaft and is positioned inside an inner peripheral surface of the projection portion.

2. The motor according to claim 1 , wherein
the rotor core is a magnetic body, and
a detection surface of the magnetic sensor faces the inner peripheral surface of the projection portion.

3. The motor according to claim 2 , wherein
the detection surface of the magnetic sensor is positioned between the projection portion and the rotational shaft.

4. The motor according to claim 3 , wherein
the magnetic sensor is at a position away from an end portion of the projection portion and the bearing in the direction of the rotational shaft.

5. The motor according to claim 4 , wherein
the magnetic sensor detects a magnetic flux in a radial direction of the magnet.

6. The motor according to claim 1 , comprising:
a holder supporting the magnetic sensor; and
a housing accommodating a bracket, the bracket supporting the bearing, wherein
the holder and the bracket are lined in the direction of the rotational shaft.

7. The motor according to claim 6 , wherein
the magnetic sensor includes a terminal unit extending in the direction of the rotational shaft, and
the terminal unit of the magnetic sensor is attached to the holder.

8. The motor according to claim 7 , comprising a conduction terminal to be electrically connected with an exterior, wherein
the conduction terminal is attached to the holder.

9. The motor according to claim 8 , wherein
the holder is formed with a single member.

10. The motor according to claim 7 , comprising
plate-like members including a conductive property, wherein
the plate-like members are electrically connected with the plural terminals, and
the terminal unit of the magnetic sensor includes plural terminals, and
the respective plural plate-like members in the holder are disposed and lined in the direction of the rotational shaft.

Assignees

• Minebea Mitsumi Inc

Inventors

• Suzuki Tomohisa
• Kamogi Yutaka

Classifications

• H02K11/215

  Magnetic effect devices, e.g. Hall-effect or magneto-resistive elements · CPC title

• H02K1/2733

  Annular magnets · CPC title

• H02K5/225

  Terminal boxes or connection arrangements (specially adapted for submersible motors H02K5/132) · CPC title

• H02P6/16

  Circuit arrangements for detecting position · CPC title

• H02K29/12

  using detecting coils {using the machine windings as detecting coil} · CPC title