A synchronous electric motor is distinguished by its rotor spinning at the same rate as the oscillating field which drives it. Another way of saying this is that it has zero slip under usual operating conditions. Contrast this with an induction motor, which must slip in order to produce torque. R0t0r is from efnet ... Induction Motor (IM) is one kind of AC motor where power is supplied to the rotating device by induction. ...
Advantages
Synchronous motors have the following advantages over non-synchronous motors :
Speed is independent of the load, provided an adequate field current is applied.
Accurate control in speed and position using open loop controls, eg. stepper motors.
They will hold their position when a DC current is applied to both the stator and the rotor windings.
Their power factor can be adjusted to unity by using a proper field current relative to the load. A leading (capacitive) P.F. can also be obtained by increasing this current slightly, which can help achieve a better power factor correction for the whole installation.
Their construction allows for increased electrical efficiency when a low speed is required (as in ball mills and similar apparatus).
The top electromagnet (1) is charged, attracting the topmost four teeth of a sprocket. ... The power factor of an AC electric power system is defined as the ratio of the real power to the apparent power, and is a number between 0 and 1. ... Power factor correction (PFC) is a technique of counteracting the undesirable effects of electric loads that create a power factor (p. ... A ball mill, a type of crusher, is a cylindrical device used to grind (or mix) materials like ores, chemicals, ceramics and paints. ...
Synchronousmotors provide rotation at a fixed speed in synchronization with the frequency of the power source, regardless of fluctuation of the load or line voltage.
Synchronous speed is 1800 r/min at 60 Hz.
It is possible to decrease motor rotation by attaching a gearhead.
Synchronousmotors are occasionally used as traction motors; the TGV may be the best-known example of such use.
Closely related in design to three-phase ACsynchronousmotors are stepper motors, where an internal rotor containing permanent magnets or a large iron core with salient poles is controlled by a set of external magnets that are switched electronically.
A linear motor is essentially an electric motor that has been "unrolled" so that instead of producing a torque (rotation), it produces a linear force along its length by setting up a traveling electromagnetic field.
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