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Electric motor

A technology of motors and brushes, which is applied in the field of motors, can solve problems such as destroying magnetic balance, and achieve the effects of improving product life, balancing circuits, and inhibiting wear

Active Publication Date: 2009-12-16
MITSUBA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, on the X-region side and the γ-region side of the axis M, the number of coils through which the current flows is not equal, and the magnetic balance is broken, which causes vibration and noise.

Method used

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  • Electric motor
  • Electric motor
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] figure 1 It is a partial sectional side view showing the structure of the motor according to Embodiment 1 of the present invention. Motor 1 is used as the driving source of the car wiper device, such as figure 1 As shown, the armature 3 is configured to be freely rotatable in a bottomed cylindrical motor case 2 . A pair of permanent magnets 4 are fixed on the inner peripheral surface of the casing 2 along the circumferential direction. With this permanent magnet 4, the motor 1 is constituted as 2 poles.

[0043] The armature 3 is composed of an armature core 6 fixed to the rotation shaft 5 and an armature coil 7 wound onto the armature core 6 . The armature core 6 is formed by stacking a plurality of annular metal plates 8 . On the outer peripheral portion of the metal plate 8, a plurality of (12 in this embodiment) teeth 9 (see image 3 ). By fitting a plurality of metal plates 8 on the rotating shaft 5 in a non-rotating manner, ant trench-shaped grooves 11 can...

Embodiment 2

[0063] Next, the case where the armature coil is used as the full-pitch winding will be described as Embodiment 2 of the present invention. Figure 8 is a developed view showing the winding state of the armature coil in the motor according to Embodiment 2 of the present invention, Figure 9 illustrate Figure 8 The winding position of the armature coil in the motor. The overall structure of the motor is figure 1 The same as the above, the description is omitted. In addition, in the following embodiments, the same components as those in Embodiment 1 are partly assigned the same reference numerals and their descriptions are omitted.

[0064] Such as Figure 8 As shown, for example, one end of the armature coil in Embodiment 2 is wound from the No. 3 commutator segment 14C, and the winding 12 in the riser wound on the No. A coil 7A1 is formed between the slot 11a between the teeth 9 and the slot 11g between the sixth and seventh teeth 9 . The coil 7A1 is wound a number of ...

Embodiment 3

[0069] Next, an example of coil winding when the number of winding turns is an odd number will be described as Embodiment 3 of the present invention. When the number of turns of the winding is an odd number (2n+1), in the foregoing embodiment, the number of turns of one of the first and second coils is increased by one to obtain (n, n+1). But in this way, the number of turns of the first and second coils is different. In order to make the number of winding turns an even number, the relationship between the first and second coils is not completely symmetrical. Figure 4 The improvement effect shown is sometimes weakened.

[0070] For this reason, the present inventors studied a winding method that can obtain the desired improvement effect even when the number of winding turns is an odd number. As a result, through Figure 10The winding method shown achieves a balanced winding even when the number of winding turns is odd. Figure 10 is the expanded diagram of this winding. S...

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Abstract

For motors with low-speed, high-speed and common brushes, the armature coils are symmetrically arranged corresponding to the arrangement of low-speed and high-speed brushes, so as to improve its durability and reduce its vibration and noise.

Description

technical field [0001] The present invention relates to a motor mounted on a vehicle, etc., and particularly to a motor having high-speed brushes and low-speed brushes used in a drive source such as a wiper device. Background technique [0002] Generally, as a drive source of a wiper device mounted on a vehicle such as an automobile, a motor with brushes (hereinafter may be abbreviated as a motor as appropriate) is often used. This type of motor has a structure in which a rotatable armature around which an armature coil is wound is provided inside a cylindrical yoke with magnets mounted on the inner peripheral surface. The armature has an armature iron core which is externally embedded and fixed on the rotating shaft. Many long slots are formed in the axial direction on the armature core. Coils are wound around the slots at regular intervals to form a plurality of coils. The coil is connected to the commutator segment mounted on the same rotation. The commutator piece is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02K23/00H02K23/20H02K23/34
CPCH02K23/34H02K23/20
Inventor 川岛义亲熊谷俊司
Owner MITSUBA CORP