Principle and structure of electric bike hub motor
First, the working principle of the electric bike hub motor
Electric bike hub motor is the motor embedded in the hub, the stator is fixed on the tire, the rotor is fixed on the shaft, a power is fixed rotor relative movement. Electronic commutator (switching circuit) according to the signal of the position sensor, control the stator winding power sequence and time, generate a rotating magnetic field, drive the rotor rotation.
Two, electric bike hub motor structure
1, stator core
The stator core of the electric bike hub motor is a part of the magnetic circuit of the motor, and the stator windings are placed on it. It is generally made of 0.35~ 0.5mm thick silicon steel sheet surface with a layer of insulation layer, laminated. Grooves are evenly distributed in the inner ring of the iron core for embedding stator windings.
2, stator winding
The stator windings are the electrical parts of the motor that are connected to three-phase alternating current and generate a rotating magnetic field. It is connected by three completely same windings with 120° electric Angle and team size arrangement in space. Each coil of these windings is respectively embedded in each slot of the stator according to certain rules to ensure reliable insulation between the conductive part of the windings and the core as well as between the windings themselves.
The base is usually cast iron. The base of large asynchronous motors is generally welded with steel plates. The base of miniature motors is cast aluminum.
4, rotor core
The rotor core of the electric bike hub motor is used as a part of the magnetic circuit of the motor and the rotor winding is placed in the core groove. The material used is the same as the stator, which is made of 0.5mm thick silicon steel sheet and laminated.
5, Rotor winding
The rotor winding of the three-phase asynchronous motor cuts the stator rotating magnetic field to generate the induced electromotive force and current, and forms the electromagnetic torque to make the motor rotate.