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Rotator Of Rotational Electric Machine

A technology for rotating electrical machines and rotors, applied in steering mechanisms, power steering mechanisms, electromechanical devices, etc., can solve problems such as deterioration of controllability, vibration, etc., and achieve the effect of avoiding the increase of cogging torque and torque ripple

Active Publication Date: 2015-05-27
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, controllability deteriorates, and vibration

Method used

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  • Rotator Of Rotational Electric Machine
  • Rotator Of Rotational Electric Machine
  • Rotator Of Rotational Electric Machine

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0020] figure 1 A rotor is shown, which is applied to the electric motor 10 as a rotating electrical machine. The electric motor 10 is used as a driving force source of a vehicle electric power steering device.

[0021] (overall structure)

[0022] First, refer to figure 1 and 2 The overall structure of the motor 10 will now be described. The motor 10 is a three-phase circuit brushless motor. The electric motor 10 has a housing 20 , a stator 30 , a shaft 40 and a rotor 50 . The housing 20 has a cylindrical case 21 , a first cover 22 closing one end of the cylindrical case 21 , and a second cover 23 closing the other end of the cylindrical case 21 . Each of the first cover 22 and the second cover 23 has a bearing 24, 25 at its central portion.

[0023] The stator 30 is an armature of the electric motor 10 , and the stator 30 has a stator core 31 and a winding 32 . The stator core 31 forms a cylindrical yoke 33 fixed to the inner wall of the cylindrical case 21 , and a p...

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PUM

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Abstract

A rotor core has a regular decagon base portion in its cross section relative to a shaft center and ten convex portions each of which is located between each angle of the regular decagon base portion. Each convex portion has a first convex curve having a single curvature radius. Each permanent magnet is a curved plate and has a concave curve and a second convex curve. Each permanent magnet is provided so that the concave curve adheres on the first convex curve. When each permanent magnet moves in circumferential direction relative to the rotor core, the concave curve slides on the first convex curve of the rotor core. A position of the smallest gap clearance between the second convex curve and the stator does not change. A magnetic-flux-strength maximum position is not changed easily.

Description

technical field [0001] This disclosure relates to rotors for rotating electric machines. Background technique [0002] In the technical field of rotating electrical machines, it is required to reduce the amount of rare material forming permanent magnets. Generally, the rotor has ring-shaped permanent magnets. In order to reduce the amount of permanent magnets, it can be arranged that a plurality of permanent magnets are circumferentially arranged. Compared with ring-shaped permanent magnets, the amount of permanent magnets can be reduced. [0003] When multiple permanent magnets are arranged circumferentially, it is important that each permanent magnet is properly secured to the core. For example, JP-2012-249354A describes fixing a flat surface of a permanent magnet on a flat surface of an iron core. The protrusions of the iron core meet the grooves of the permanent magnet. [0004] However, in JP-2012-249354A, in order for the protrusion of the iron core to contact the...

Claims

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Application Information

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IPC IPC(8): H02K1/27
CPCB62D5/0403H02K1/278H02K29/03
Inventor 谷口真
Owner DENSO CORP