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The main difficulty with PSC motors comes with repairs. In many designs, either the capacitor or secondary winding must be removed to service the start winding. When turning a PSC motor on, it may be possible to simply reconnect it, but when it fails, there is no way to repair it. Additionally, as the magnetic field is inherent to each component physically connected to one of the windings, there may not be a way to replace the motor without doing a complete overhaul of the wiring, which could result in fire hazard or interference with mechanical operation. While PSC motors are not uncommon today, they have mainly been limited to cases where the weight of a PSC motor and motor drive is less than the weight of a motor that requires a different motor shaft rotation.
A permanent split-phase (PSP) electric motor is a motor made up of two, more or less equally sized, phases which connect together via a switch. We split the phase windings permitting the switching from one phase (during one period) to another, for example, reversing direction or changing speed. By designing one winding of the motor's sine-wave bridge as a start winding and the other as a run winding, it is possible to make a three-winding motor share a single rotor.
However, the main disadvantage of this design is that the motor has no start winding, which means that it cannot be started with ordinary utility power, and the motor requires the application of a high voltage electrical supply which may be difficult to find. Another disadvantage is that the motor is not normally reversible, and requires a separate starter as a special application. d2c66b5586