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This paper proposes a quick PMSM torque ripple reduction method caused by current sensor offsets. The proposed method consists of two novel offset compensation methods without any motor parameters. The first method estimates the current sensor offsets from output voltage references. Meanwhile, the second method estimates the current sensor offsets from detected output currents. By selecting the compensation...
This paper proposes novel V/f control for interior permanent-magnet synchronous motors (IPMSMs) in order to achieve maximum torque per ampere (MTPA) control without motor parameters such as dq-axis inductance and flux linkage of a permanent magnet. The V/f control does not require either information of a rotor position or the motor parameters in order to construct the control system. However, the...
Offset error of a motor-current sensor varies during motor drive and increases torque ripple. To maintain torque at a high quality, on-line methods for compensating that offset error are required. Accordingly, two methods for compensating offset error by using the DC-voltage components included in phase-voltage commands are proposed and evaluated by experiments and simulation respectively. The evaluation...
This paper introduces performance of a power leveling system with a 3.0-MJ, 2900-r/min of flywheel energy storage for multiple parallel operations. In terms of cost reduction and improvement efficiency, this system uses low cost ball bearings at the low speed. Moreover, the system is composed by not a large capacity flywheel but many flywheels with small energy capacity but the cost reduction of the...
This paper presents a method for reducing a motor torque ripple resulting from a motor phase current sensor offset error for motor drive applications such as a hybrid electric vehicle. The proposed method estimates the motor phase current sensor offset error on the basis of the direct voltage value included in the voltage source inverter output voltage reference value calculated by a discrete Fourier...
This paper evaluates total loss of an induction motor and a permanent magnetic motor drive system applying two various modulation strategies on each motor, which are the PWM operation and the six-step operation. At first, the loss analysis is implemented based on the theoretical model of an inverter and an induction motor. As a result, when the leakage inductance is less than 25%, the PWM drive should...
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