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Rotating electrical machine and electric power steering system using the same

A technology of rotating electrical machines and electric drives, applied in electric steering mechanisms, synchronous motors with stationary armatures and rotating magnets, electromechanical devices, etc. Problems such as the stator slot fullness ratio of the motor, to achieve the effects of high torque ripple, reduced cogging torque, and high torque

Inactive Publication Date: 2014-04-02
HITACHI AUTOMOTIVE SYST LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, EPS motors require high rotational speed-torque characteristics (N-T characteristics), and cannot cope with high-speed rotation areas unless the number of coil turns is reduced.
Moreover, the requirement for high torque is also high, and driving under high current is required, so the wire diameter of the coil needs to be increased
However, the rigidity of the magnet wire in the coil with a large wire diameter increases, and it is difficult to improve the slot fill factor in the stator slot of the motor

Method used

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  • Rotating electrical machine and electric power steering system using the same
  • Rotating electrical machine and electric power steering system using the same
  • Rotating electrical machine and electric power steering system using the same

Examples

Experimental program
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Embodiment 1

[0035] The first embodiment of the present invention will be described. First, use figure 1 ~3 explains the operation principle related to the electric power steering of this embodiment. The electric power steering system of this embodiment has: an on-vehicle power supply; a control device that converts DC power supplied from the on-vehicle power supply via wiring into multi-phase AC power, and controls the output thereof according to torque applied to the steering wheel; and An electric power steering motor that is driven by AC power supplied from the control device and outputs steering assist torque, wherein the electric power steering motor has: a frame; a stator fixed to the frame; The rotor arranged opposite to the stator has a stator core and multi-phase stator coils incorporated in the stator core. The stator core is composed of an annular core yoke (back core) and a radial It consists of a plurality of protruding tooth cores, a groove is formed between adjacent tooth...

Embodiment 2

[0053] use Figure 7 A second embodiment of the present invention will be described. Figure 7 (a) shows the assembled state of the stator core 200, the bobbin 300, and the stator coil 400. Here, the stator coil 400 adopts a square wire or a flat wire. Square or flat wires are suitable for winding stator coils neatly, and can be expected to improve the slot fill factor. In addition, compared with the round wire, the coil is not easy to move in the slot after winding, and it is also more convenient to manufacture. Figure 7 (b) is a diagram showing continuous winding of adjacent in-phase coils. Here too, the stator coil is continuously wound around two teeth from the winding start end 401 until the winding end 402 is reached. Also, similarly to the first embodiment, when the number of turns of one coil is n, the number of turns of the adjacent same-phase coil is an integer number more than n turns or an integer number less than n turns. In addition, it is more preferable t...

Embodiment 3

[0055] use Figure 8 Embodiment 3 of the present invention will be described. Figure 8 (a) shows the assembled state of the stator core 200, the bobbin 300, and the stator coil 400. Figure 8 (b) is a diagram showing continuous winding of adjacent in-phase coils. The stator coil starts to wind from the winding starting end 401. After winding n turns, it spans to the adjacent teeth, and continuously winds m turns on the adjacent teeth in the opposite direction of winding, where m is more than n turns 0.5 turns or 0.5 turns less than n turns. where n and m are integer values. In this way, the space of the slot can be effectively used, the fullness of the slot can be improved, and the degree of freedom of design can be improved. As in the first and second embodiments, since fine selection of the number of turns is possible, the degree of freedom in design can be greatly improved. In addition, in this case, since the winding start end and the winding end protrude opposite to...

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Abstract

The invention relates to a permanent magnet motor which aims to increase slot filling factor and design freedom in a motor for low voltage and large torque. A rotating electrical machine of the invention is characterized in that: in a concentrated winding motor having the combination of the number of poles and the number of slots of 10:12 or 14:12, the numbers of coil turns of adjacent same-phase coils are different.

Description

technical field [0001] The present invention relates to a rotating electrical machine and an electric power steering (electric power steering) device using the rotating electrical machine. Background technique [0002] The installation rate of electric power steering (EPS) has risen sharply due to electrification-based replacement of hydraulic pressure and the introduction of hybrid electric vehicles (HEV) and electric vehicles (EV). In vehicle-mounted auxiliary mechanisms represented by electric power steering motors, the vehicle-mounted battery (for example, 12V) serves as an energy supply source, and drives under low-voltage conditions. However, EPS motors require high speed-torque characteristics (N-T characteristics), and cannot cope with high-speed rotation unless the number of coil turns is reduced. Moreover, the requirement for high torque is also high, and driving under high current is required, so the wire diameter of the coil needs to be increased. However, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K21/16H02K1/16H02K1/27B62D5/04
CPCH02K3/00H02K3/28H02K21/16H02K2213/03H02K29/03Y02T10/641
Inventor 岩崎则久北村正司金泽宏至川崎省三
Owner HITACHI AUTOMOTIVE SYST LTD
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