Abstract
Nowadays, more and more electric machines are demanded to operate under wide ranges of speed and load conditions. This paper deals with the operating performance enhancing method for doubly salient electromagnetic machine (DSEM) under light load condition. With the finding that the power loss can be decreased with reduced field current, and there's regulated space for the distribution of field current and armature current under light load condition. A novel control method with field current inner loop and speed outer loop is proposed for DSEM, the system driving efficiency is desired to be improved. Meanwhile, the cogging torque which is a main ripple source of DSEM torque can be decreased with the reduced filed current, so the output torque performance can be enhanced as well. In addition, the armature reaction of the proposed control method is researched, and the influence on the filed current control during commutation process is theoretically analyzed. The experiments on a 12/8-pole DSEM validate the correctness and flexibility of the proposed control method.
Highlights
With the wide application of machine in various fields, more and more machines are demanded to operate under wide ranges of speed and load conditions, and some of them are even in non-rated working state for long-term, such as electric vehicle, wind power generation motor, photovoltaic powered watering pumps and et al [1]–[3]
THE PROPOSED DOUBLE CLOSED LOOP CONTROL To deal with the problems of power loss and torque ripple caused by the traditional field current control method under light load condition, this paper proposes a novel double
It’s seen the armature current is controlled to the rated value 15A, and the speed of doubly salient electromagnetic machine (DSEM) can be regulated by adjusting the field current, which is the output of the speed control loop
Summary
With the wide application of machine in various fields, more and more machines are demanded to operate under wide ranges of speed and load conditions, and some of them are even in non-rated working state for long-term, such as electric vehicle, wind power generation motor, photovoltaic powered watering pumps and et al [1]–[3]. THE PROPOSED DOUBLE CLOSED LOOP CONTROL To deal with the problems of power loss and torque ripple caused by the traditional field current control method under light load condition, this paper proposes a novel double. What’s more, the back EMFs get smaller because of the decrease of field current, the commutation process is can be shortened due to the increase of phase current changing rates, so the commutation ripple is desired to be suppressed especially for high speed condition, contributing to the output torque performance enhancement as well. Because of the experimental condition limitation, the system starting efficiency is evaluated according to the DC link current idc comparison under the circumstances of constant DC bus voltage, same load resistance and motor speed
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