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At load operation, suspension control of bearingless motors are became unstable by interference of the motor flux. Therefore, it is necessary to decoupling compensation for stable magnetic levitation. Conventionally, perform the parameter identification test of suspension force by attaching a special jig to bearingless motors. However, conventional method restricted in the shape of the rotor. The...
In the automotive industry, a reduction in CO2 and low fuel consumption is required from the view of environment. According to such demand, electric vehicle using an inverter fed motor is developed and diffused. However, partial discharge is generated between motor winding, when the higher voltage is applied to the winding. Thereby, it may induce a fatal breakdown in the cover insulating. Judging...
Since the space charge accumulation sometimes enhances the electric field in an insulating material, it can be thought as a reason of unexpected PD (partial discharge) generation. Therefore, measurements of the space charge in the insulating layer of the winding are required. The space charge accumulation in the insulating material is usually carried out using the PEA (pulsed electro-acoustic) method...
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