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1-2 Components of a Motor Nidec Corporation Universal motors also lend themselves to electronic speed control and, as such, are a choice for devices such as domestic washing machines. The motor can agitate the drum by switching the field winding with respect to the armature. The BLDC motor's characteristic trapezoidal counter-electromotive force waveform is derived partly from the stator windings being evenly distributed, and partly from the placement of the rotor's permanent magnets. In that design, the rotor fits inside a magnetically soft cylinder that can serve as the motor housing, and provides a return path for the flux. An advantage is that AC power may be used on motors that specifically have high starting torque and compact design if high running speeds are used. Such motors are used in devices that are not heavily used, and have high starting-torque demands. Household blenders that advertise many speeds typically combine a field coil with several taps and a diode...