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Doubly fed synchronous motors use independently-excited multiphase AC electromagnets for both rotor and stator. [2] Synchronous and induction motors are the most widely used AC motors. Synchronous motors rotate at a rate locked to the line frequency since they do not rely on induction to produce the rotor's magnetic field.
Present interest in AC synchronous ceramic superconducting machines is in larger machines like the generators used in utility and ship power plants and the motors used in ship propulsion. American Superconductor and Northrop Grumman created and demonstrated a 36.5 MW ceramic superconductor ship propulsion motor.
In an industrial plant, synchronous motors can be used to supply some of the reactive power required by induction motors. This improves the plant power factor and reduces the reactive current required from the grid. A synchronous condenser provides stepless automatic power-factor correction with the ability to produce up to 150% additional vars.
In the asynchronous category, we have induction motors, while the synchronous group contains permanent-magnet and current-excited motors. Induction motors have been around since the 19th century.
Synchronous motors are occasionally used as traction motors; the TGV may be the best-known example of such use. Huge numbers of three phase synchronous motors are now fitted to electric cars [citation needed]. They have a neodymium or other rare-earth permanent magnet. One use for this type of motor is its use in a power factor correction scheme.
For cost reasons synchronous linear motors rarely use commutators, so the rotor often contains permanent magnets, or soft iron. Examples include coilguns and the motors used on some maglev systems, as well as many other linear motors. In high precision industrial automation linear motors are typically configured with a magnet stator and a ...
A brushless DC electric motor (BLDC), also known as an electronically commutated motor, is a synchronous motor using a direct current (DC) electric power supply. It uses an electronic controller to switch DC currents to the motor windings producing magnetic fields that effectively rotate in space and which the permanent magnet rotor follows.
An industrial electric motor . An electric motor is a machine that converts electrical energy into mechanical energy.Most electric motors operate through the interaction between the motor's magnetic field and electric current in a wire winding to generate force in the form of torque applied on the motor's shaft.