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Analysis of the Causes of Electric Bicycle Motor Vibration

Update:23 Oct 2018
Summary:

Nowadays, Electric Bicycle Motor are widely used in var […]

Nowadays, Electric Bicycle Motor are widely used in various industries, such as some electric bicycles, but in use, there will be some problems, such as vibration, which will directly lead to loose internal lines and then will not work properly. In general, the reasons are still quite a lot.

Electric bicycle motor vibration causes:

1. Power supply: Three-phase voltage is unbalanced, and three-phase motor is out of phase. Stator aspect: the stator core becomes elliptical, eccentric, loose; the stator winding breaks, grounds breakdown, turn-to-turn short circuit, wiring error, stator three-phase current imbalance. Rotor failure: the rotor core becomes elliptical, eccentric, and loose. The rotor cage strip is welded to the end ring, the rotor cage strip is broken, the winding is wrong, and the brush is in poor contact.

2. The electric bicycle motor mix causes vibration. Motor vibration is often caused by uneven air gap, causing single-sided electromagnetic pulling force, and the single-sided electromagnetic pulling force further increases the air gap. This electromechanical mixing acts as motor vibration.

The electric bicycle motor is axially synchronized. Due to the gravity or installation level of the rotor itself and the magnetic center is not right, the electromagnetic pulling force caused by the axial movement of the motor causes the motor vibration to increase. In severe cases, the shaft is ground and the bearing temperature is increased. Rapidly rising.

3. Mechanical causes vibration. Electric bicycle motor itself: rotor imbalance, shaft bending, slip ring deformation, stator and rotor air gap uneven, stator and rotor magnetic center are inconsistent, bearing failure, poor foundation installation, mechanical mechanism strength is insufficient, resonance, ground screw loose The motor fan is damaged.

The coupling is damaged, the coupling is poorly connected, the coupling is not centered, the load is mechanically unbalanced, and the system is resonant. The linkage part of the shaft system is misaligned, the center line does not coincide, and the centering is incorrect. The cause of this failure is mainly caused by poor alignment and improper installation during the installation process. There is also a case where some of the center lines of the interlocking parts are coincident in the cold state, but after a period of operation, the center line is broken due to the deformation of the rotor fulcrum and the foundation, thereby generating vibration.

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