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This paper investigates a method of reducing vibration property of a permanent-magnet synchronous motor (PMSM) with dual three-phase windings, especially focusing on carrier harmonic component. Carrier phase shift pulse width modulation (PWM) which makes any difference between PWM carrier phase of 1st winding and 2nd winding, is applied to 24-slot 20-pole PMSM. A tested motor is manufactured and measured...
This paper investigates a method to increase fuel economy of motors for an electric vehicle (EV) traction system. The low-torque region of an EV motor is frequently used in everyday urban driving and in fuel economy measurement. Pulsewidth modulation (PWM) carrier harmonic iron loss accounts for a high percentage of total loss for EV motors in this region. This paper reveals the relationship between...
This research proposes a novel low-voltage inverter-fed motor drive with variable characteristics which is achieved through the individual armature winding current control for the automobile traction motor. The independent armature winding with low-voltage inverters can improve the total efficiency by reducing the converter losses. Furthermore, when the inverters are able to change their connections...
This research proposes a novel low-voltage inverter-fed motor drive with variable characteristics achieved through the individual winding current control for the automobile traction motor. The independent armature winding with low-voltage inverters can improve the total efficiency by reducing the converter losses. Furthermore, the motor can expand the operating range since the inverters are able to...
A traction motor system of electric vehicles (EVs) requires wide torque-speed operation range, high efficiency, and low torque ripple according to its driving point. To achieve the requirements without increasing motor size, a novel variable characteristics motor system is proposed in this paper. A winding structure is studied to reduce unprofitable conductor which makes conduction loss. The developed...
This paper is investigated to increase fuel economy of motor for electric vehicles (EVs) traction system. Low torque region of EV motor is frequently-used point in usual urban driving and in fuel economy measurement. Pulse-width modulation (PWM) carrier harmonic iron loss takes up high percentage for EV motors in this region. This paper reveals the relationship between phase current and carrier harmonic...
An interior permanent magnet synchronous motor experiences large harmonic iron loss in the stator teeth caused by the harmonic magnetomotive forces. In particular, the eddy current loss remarkably increases at high rotational speeds under the flux weakening control. In this paper, a novel suppression control method for the stator iron loss is proposed by utilizing the individual winding current control...
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