Synchronous Motor with Silicon Steel Salient Poles Rotor and All Coils Placed on The Stator

Paper #:
  • 2017-01-1606

  • 2017-03-28
Synchronous motors are used in electric and hybrid cars as power drivers. The most often they are used with excitation by using super strong permanent magnets designed with rare earth elements technology. This permanent magnets are expensive. Excitation with permanent magnets do not allows change value of the motor flux excitation during the motor operation and do not allows the power factor control, which is one of the important property of synchronous motors. It is known, that synchronous motors have very high efficiency. Also, synchronous motors keeps constant rotor speed under external mechanical load. The regular synchronous motors, with electro magnet rotor on silicon steel cores, have rings and brushes for connection rotor coil excitation to direct current (DC) voltage source. This arrangement with rings and brushes decrease motors reliability and demands regular maintenance. In this paper, we consider a new design of synchronous motor with salient poles rotor and all coils placed on the stator. In this design, it is used laminated silicon steel rotor which is more chipper than with use super strong permanent magnets. This design of machine eliminates copper rings on the rotor and brushes, and eliminates disadvantages involved by this arrangement. In earlier publication, authors considered the opportunity realization of synchronous mode operation in the machine with salient pole rotor and DC stator excitation. Now, we consider the new synchronous mode operation with individual DC excitation each of the alternative current (AC) winding for realization one, two, and three phase synchronous machines. The more attention in analyses and design we take to one phase motor operation because it is the base for design poly phase synchronous machines. Synchronous machines do not produced starting torque. So, we consider one case of starting the new designed synchronous motor based on idea of induction machine operation. Another method is based on the principle operation of the direct current (DC) machine. Prototypes of synchronous motors were designed as one phase, two, and three phase motors. Results of test these prototype machines confirms the main useful properties of synchronous machines.
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