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Motor stators, electric motors and power tools

A motor stator and stator slot technology, which is applied in the field of electric tools and motor stators, to achieve a large power output range, improve torque efficiency, and improve efficiency

Active Publication Date: 2020-07-10
BOSCH POWER TOOLS CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Another issue to consider in the design of an AC motor is the armature reaction

Method used

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  • Motor stators, electric motors and power tools
  • Motor stators, electric motors and power tools
  • Motor stators, electric motors and power tools

Examples

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Embodiment Construction

[0031] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Those skilled in the art will appreciate that these descriptions are only descriptive and exemplary, and should not be construed as limiting the protection scope of the present invention.

[0032] First of all, it should be noted that the orientation terms such as top, bottom, upward, and downward mentioned in this article are defined relative to the directions in each drawing, and they are relative concepts, and therefore can be defined according to their It varies with different positions and different practical states. Accordingly, these or other directional terms should not be construed as limiting terms.

[0033] In addition, it should also be noted that for any single technical feature described or implied in the embodiments herein, or any single technical feature shown or implied in the drawings, these technical features (or their equival...

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Abstract

The invention relates to a motor stator. The motor stator is provided with at least two magnetic poles and at least two stator coils at a rotor turn-in side and a rotor turn-out side, wherein each magnetic pole is provided with a pole body, a yoke, a pole shoe and two stator slots; the yoke includes a rotor turn-in side yoke and a rotor turn-out side yoke; the pole shoe includes a rotor turn-in side pole arc, a rotor turn-out side pole arc, and a pole shoe surface being opposite to the rotor; the pole shoe surface is provided with symmetric arc cross sections; the stator slots are arranged between the rotor turn-in side yoke and the rotor turn-in side pole arc, and between the rotor turn-out side yoke and the rotor turn-out side pole arc; the stator coils are arranged in the stator slots; and on the radial cross section, the center line of the pole body deviates from the center line of the pole shoe surface to the rotor turn-in side parallelly. The motor stator can improve the efficiency of the stator coils, the power / mass ratio of the motor, and the torque efficiency, and can enable the motor having the same size to have a greater power output range.

Description

technical field [0001] The present invention relates to the field of electrical machine components, and more particularly, to an electrical machine stator with an asymmetrical slot, yoke and pole configuration. The invention also relates to a motor including the motor stator and an electric tool including the motor. Background technique [0002] A motor is often provided in a power tool, typically an AC general-purpose motor. AC general purpose motors generally comprise at least two stator poles with an annular yoke structure forming a symmetrical geometry. The stator coils are located in stator slots or wire slots around the magnetic poles. When energized, the stator coils are energized together with the stator poles to generate an electromagnetic field, which drives the rotor to generate electromagnetic torque. [0003] In motor design, the area of ​​the stator slot or wire slot is determined according to the expected motor output power and the expected rotor output tor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02K1/14
CPCH02K1/146H02K2213/03
Inventor 吴庆明方承志
Owner BOSCH POWER TOOLS CHINA
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