Motor structure for variable counter electromotive force

Patent metadata

Field	Value
Publication number	US-10050504-B2
Application number	US-201514959645-A
Country	US
Kind code	B2
Filing date	Dec 4, 2015
Priority date	Jun 15, 2015
Publication date	Aug 14, 2018
Grant date	Aug 14, 2018

Abstract

A motor structure for varying a counter electromotive force is provided. The motor structure includes a rotor that is fixed annularly and concentrically to a radially outside from an exterior circumferential surface of a shaft of an electric motor and has a permanent magnet, and a stator that has coils positioned on the interior side of a motor housing and on the concentrically exterior side with the permanent magnet of the rotor. Further, the coils are positioned spaced apart from each other at predetermined intervals. A drive unit moves the stator in the axial direction of the shaft to vary the interlinkage flux, by varying an area that the magnetic flux of the permanent magnet of the rotor passes through the coils of the stator.

First claim

What is claimed is:

1. A method of varying a counter electromotive force in a motor, comprising:
fixing a rotor annularly and concentrically to radially outside from an exterior circumferential surface of a shaft of an electric motor and having a permanent magnet;
positioning a stator having coils on the interior side of a motor housing and on the concentrically exterior side with the permanent magnet of the rotor and positioned to be spaced apart from each other at predetermined intervals; and
operating a drive unit configured to move the stator in the axial direction of the shaft to vary the interlinkage flux, by adjusting an area that the magnetic flux of the permanent magnet of the rotor passes through the coils of the stator,
wherein a slide distance of the stator by the drive unit is variably adjusted to decrease by an inverse proportionality the interlinkage area in response to an increase in rotational speed of the motor so as to reduce occurrence of counter electromotive force of the motor.

2. The method of claim 1 , wherein the stator is fixed to a cylindrical stator support portion slidably disposed in the axial direction of the shaft by the drive unit on the interior surface of the housing.

3. The method of claim 2 , wherein the drive unit is configured actuate the cylindrical stator support portion to slide by hydraulic pressure.

4. The method of claim 3 , wherein an end portion of the cylindrical stator support portion is formed as a piston the hydraulic pressure is supplied to and discharged from a cylinder unit formed within the housing by a hydraulic pump operated by a controller, and the piston slides in the axial direction of the shaft.

5. The method of claim 2 , wherein the drive unit is configured to actuate the cylindrical stator support portion to slide by a motor.

6. The method of claim 5 , wherein the drive unit forms a gear unit in an output shaft of the motor configured to be rotated y the controller and is coupled to the cylindrical stator support portion, rotates in a loosening and tightening direction based on the normal and reverse rotation of the gear unit of the motor output shaft, and moves forward and backward in the axial direction of the shaft.

7. The method of claim 6 , wherein the gear unit of the motor is screwed to a threaded portion formed on an interior surface of the end portion of the stator support portion.

8. The method of claim 6 , wherein the gear unit of the motor is coupled to an interior surface of the end portion of the stator support portion.

Assignees

• Hyundai Motor Co Ltd

Inventors

• Yim Jeong Bin
• Jeon Jae Hwa
• Han Dea Woong
• Lee Sang Kyu

Classifications

• H02K21/024 Primary

  Radial air gap machines · CPC title

• H02K21/14 Primary

  with magnets rotating within the armatures · CPC title

• H02K21/028

  by modifying the magnetic circuit within the field or the armature, e.g. by using shunts, by adjusting the magnets position, by vectorial combination of field or armature sections · CPC title