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Drive motor for the gearless driving of a two-wheeler

A technology for driving motors and two-wheelers, applied in electromechanical devices, electric components, magnetic circuit rotating parts, etc., can solve the problems of reducing driving torque, limiting the maximum rotation speed of activities, and difficulty in running electric motors.

Active Publication Date: 2015-10-21
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As soon as the voltage induced in the stator phases via the rotation of the rotor reaches the maximum phase voltage that can be supplied via the operating voltage source and the drive line, the drive torque is reduced and thus the maximum possible rotational speed is limited
[0005] Furthermore, the lack of saliency in the rotor makes it difficult to operate electric motors with sensorless rotor position detection, since only in the case of electric motors with pronounced saliency is it possible to Connect an inductor to obtain rotor position information without additional physical sensors

Method used

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  • Drive motor for the gearless driving of a two-wheeler
  • Drive motor for the gearless driving of a two-wheeler
  • Drive motor for the gearless driving of a two-wheeler

Examples

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Embodiment Construction

[0026] figure 1 A schematic cross-sectional view of a section of an electric motor 1 is shown as a drive motor for a gearless drive of the rear wheels of a two-wheeled vehicle. The cross section is transverse to the axial direction.

[0027] The electric motor 1 is an electronically commutated external rotor motor having a rotor means 2 as an outer rotor and a stator means 3 as an inner stator.

[0028] The rotor mechanism 2 is designed in the form of a ring or a cylinder and is mounted rotatably about a rear wheel axle of a two-wheeled vehicle. The rotor mechanism 2 is constructed with permanent magnets 21 between which rotor poles 22 are arranged. The permanent magnets 21 have a tangential polarization direction, so that the magnetic poles bear against radially running sides of the rotor poles 22 . The rotor poles 22 are closed at their radially outer ends essentially flush with the radially outer ends of the permanent magnets 21 , so that they form an essentially circula...

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Abstract

The invention relates to a drive motor (1) for a drive wheel of a two-wheeler, comprising: - a circular cylindrical rotor arrangement (2) which is in the form of an outer rotor and has rotor poles (22) and permanent magnets (21); and -a stator arrangement (3) which is in the form of an inner stator and has stator teeth (31) and controllable stator coils (32); the permanent magnets (22) of the rotor arrangement (2) being arranged in such a way that the rotor arrangement (2) has saliency.

Description

technical field [0001] The invention relates to an electric motor for application on the rear hub of a two-wheeled vehicle, the electric motor having an external rotor connected to the rim. Background technique [0002] Electrically driven two-wheelers are usually powered by gearless hub motors in the rear wheels. The electric motor is preferably in the form of a brushless, electronically commutated electric motor, a so-called PMSM motor. [0003] Such electric motors have a shaft-fixed, internal stator arrangement with a relatively high number of slots, usually more than 51. The rotor of the electric motor is fixedly connected to the rim of the rear wheel and generally has an outer ring with permanent magnets, in particular rare-earth permanent magnets, with a high number of poles, mounted on a return ring. [0004] Such a structural form is unfavorable, because the rotor has almost no obvious saliency (English saliency), that is, the virtual inductance L d and L q The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K1/27H02K7/18H02K21/22
CPCH02K21/22H02K1/2786H02K7/1846H02K1/2791
Inventor S.A.埃文斯J-L.奥吉尔N.马丁
Owner ROBERT BOSCH GMBH