Inverter Drive for Doubly Salient Reluctance Motor: Its Fundamental Behaviour, Linear Analysis and Cost Implications

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Inverter Drive for Doubly Salient Reluctance Motor: Its Fundamental Behaviour, Linear Analysis and Cost Implications

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© The Institution of Electrical Engineers
Published

A variable-speed drive using a doubly salient variable reluctance motor, because of its ability to operate efficiently from unidirectional winding currents, enables the number of main switching devices in the inverter to be halved, yielding a very economical brushless drive. The drive is analysed using a linear model for the motor, yielding phase-current waveforms which enable an economical design for the thyristor inverter and provide guidance for a motor design which will optimise the performance/cost ratio of the drive as a whole. A control strategy for firing and turning off the inverter thyristors at appropriate rotor angles for a traction application also emerges from the analysis. Experimental waveforms exhibit shapes similar to those predicted, and the results of this analysis have been of great value in designing such a drive for a battery vehicle.

Inspec keywords: reluctance motors; thyristor applications; electric drives; invertors

Other keywords: traction; control strategy; motor design; firing; battery vehicle; thyristor invertor; linear analysis; invertor drive; switching devices; doubly salient variable reluctance motor

Subjects: Power electronics, supply and supervisory circuits; Drives; Synchronous machines

References

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