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Brushless motor and method for manufacturing brushless motor

A brushless motor, iron core technology, applied in the manufacture of motor generators, stator/rotor bodies, electric components, etc., can solve problems such as inability to suppress, deterioration of cogging torque characteristics, etc.

Active Publication Date: 2013-11-13
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in the brushless motor as described above, the cogging torque caused by the teeth (slots) of the stator and the number of poles of the rotor can be reduced, but the precision (manufacturing Deterioration of the cogging torque characteristics caused by the deviation of the shape of each tooth)

Method used

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  • Brushless motor and method for manufacturing brushless motor
  • Brushless motor and method for manufacturing brushless motor
  • Brushless motor and method for manufacturing brushless motor

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Embodiment Construction

[0027] Below, according to Figure 1 to Figure 9 An embodiment in which the present invention is embodied as an inner rotor type brushless motor will be described.

[0028] like figure 1 As shown, the housing 2 as a fixing part of the brushless motor 1 has: a cylindrical case 3 formed in a cylindrical shape with a bottom; and a front end plate 4 which connects the front end of the cylindrical case 3 ( figure 1 The opening is closed. In addition, at the rear end of the cylindrical housing 3 ( figure 1 The circuit storage box 5 is attached, and the circuit storage box 5 stores power circuits such as circuit boards.

[0029] A stator 6 is fixed to the inner peripheral surface of the cylindrical case 3 . The stator 6 includes a stator core 7 .

[0030] like Figure 2A , 2B As shown, the stator core 7 includes a plurality of core sheets 11 to 16 stacked in the axial direction. Each of the plurality of core pieces 11 to 16 is composed of an electrical steel sheet as a pla...

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PUM

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Abstract

A brushless motor includes a stator and a rotor. The stator includes an m number of slots spaced apart from one another by a slot angular interval k in a circumferential direction. The rotor includes n magnetic poles. The stator core includes a plurality of core sheets stacked with circumferential positions shifted from one another by a first angle. The first angle is a product of one of a plurality of values of j and the slot angular interval k. The plurality of values of j are values that satisfy (i×n)<(least common multiple of n and m) but do not satisfy (i×n×j×(360 / m))=(360×N), where i, j, and N are natural numbers.

Description

technical field [0001] The invention relates to a brushless motor and a method for manufacturing the brushless motor. Background technique [0002] Conventionally, there is a brushless motor with a so-called skew structure, which is provided with a plurality of stator cores which are divided along the axial direction of the brushless motor and arranged to be shifted from each other in the circumferential direction. A brushless motor with a skew structure can reduce cogging torque (see, for example, Japanese Patent Application Laid-Open No. 2-254954). [0003] However, in the brushless motor as described above, the cogging torque caused by the teeth (slots) of the stator and the number of poles of the rotor can be reduced, but the precision (manufacturing When the deviation of the shape of each tooth) causes the deterioration of the cogging torque characteristics. SUMMARY OF THE INVENTION [0004] An object of the present invention is to provide a brushless motor and a me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K29/03H02K15/02H02K1/16H02K1/27
CPCH02K15/02H02K1/16H02K15/024H02K1/2746H02K1/27H02K2213/03Y10T29/49009
Inventor 堀住伦太郎铃木工
Owner DENSO CORP