Magnetic noise from on-board electric motor
نویسندگان
چکیده
Maxwell pressure is the cause of stator deflection at the origin of acoustic noise radiated by stator. That is why precise determination of air-gap radial flux density Bg is of prime importance. It could be obtained by finite element method, semi numerical or totally analytic method with computation of magneto motive force and permeance. Slot number, pole pair number and PWM affecting acoustic behavior must be included in flux density computation. The vibratory and acoustic behaviour of a variable-speed induction machine due to Maxwell forces is detailed and validated by experimental results on several motors.
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