4, there are two phases supplying the motor. The majority of single phase indcution machines work by applying two phase currents to the motor (two windings connected to the same supply voltage, with different impedences to create different phase angles for the currents). There are a number of different types of single phase induction machine, which have slightly different approaches to creatingĪ rotating field at starting. However, single phase motors can be made, so there seems to be a contradiction in what Pulsating fields, not rotating fields and pulsating fields do not produce torque. Indicates a problem, single phase supplies produce the cross product of flux densities will be zero, the motor produces no torque. In the diagram above, both the stator and rotor flux densities will act in the y-direction. The voltage induced in the rotor circuits willĬause a current to flow, producing a flux density to oppose change in the stator flux linking theĬircuit. If an ac supply is connected to the stator winding, a pulsating flux density willīe produced, which will link the rotor circuits. The significant difference is, of-course, that there is only aĬonsider the motor schematic shown in Fig. Of a three phase motor: an ac windings is placed on the stator, short-circuited conductors are Single phase induction motors generally have a construction similar to that
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March 2023
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