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Electric Motor (Permanent Magnet DC )
A Permanent Magnet DC Motor (PMDC Motor) uses permanent magnets instead of electromagnets to generate the magnetic field needed for its operation.
In PMDC motors, the armature rotates due to a mechanical force induced by the magnetic field when current flows through its windings, according to Fleming’s left-hand rule. The PMDC motor features a simple design with a stator that houses permanent magnets and an armature with windings and a commutator. PMDC motors are efficient and cost-effective as they require no external power for field excitation and have fewer parts, making them compact. These motors are ideal for low-power applications where complex speed controls are unnecessary, such as in toys ,commonly used as a starter motor in automobiles, windshield wipers, washers, blowers used in heaters and air conditioners ,computer disc drives and in many more.
The advantages of a PMDC motor are:
- No need of field excitation arrangement.
- No input power in consumed for excitation which improve efficiency of DC motor.
- No field coil hence space for field coil is saved which reduces the overall size of the motor.
- Cheaper and economical for fractional kW rated applications.
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