Driving device for electric bicycle

Abstract

The invention discloses a driving device for an electric bicycle. The driving device comprises a rotor assembly, a stator assembly, a commutator, an electric brush and a power source. The rotor assembly comprises a rim and rotor windings arranged in the circumferential direction of the rim. The stator assembly comprises two sets of magnets arranged on the two sides of the rim. The magnets are fixed to a frame through supporting frames. The rotor windings are arranged between the two sets of magnets, and gaps are formed between the rotor windings and the two sets of magnets. The commutator is arranged on the rim and connected with the rotor windings, the electric brush is fixedly arranged on the frame through a support and connected with the power source, and the electric brush is matched with the commutator. Torque in the rim is very large, operating efficiency is remarkably improved, and auxiliary climbing performance is good. Compared with an existing driving system, the number of the adopted magnets is reduced, cost is greatly reduced, and high practicality is achieved.

Description

technical field [0001] The invention relates to the field of power-assisted bicycles, in particular to a driving device for an electric bicycle. Background technique [0002] Rotating motors are widely used in electric bicycles and electric vehicles. Vehicles that often use these motors have large rim radii in order to overcome leverage. The torque must be increased through the deceleration device to make the vehicle run normally. This design not only increases the weight of the vehicle, but also creates more mechanical friction, which makes the mechanical efficiency worse. In recent years, a gearless hub motor has become popular. This hub motor uses an outer rotor permanent magnet brushless synchronous motor. The motor stator is fixed on the axle and cannot rotate, and the magnetic steel is fixed on the rim so that the motor rotor and the rim are combined. For one, that is, the rotor is also the rim, though this booster device has saved the speed reduction device, which h...

AI Technical Summary

Problems solved by technology

But this design also results in a bulky drive wheel and very heavy weight

[0003] The name of the patent is: a drive system for linear motor-driven wheels, which enables the rim to realize the function of the motor rotor, greatly reducing the weight and volume. Although the energy loss caused by the transmission device is reduced, a large number of magnets are used, resulting in manufacturing cost is too high

The ironless solution adopted by it realizes non-resistance gliding, but the magnetic field strength at the stator winding is low, resulting in low motor efficiency and low practicability

Images