In a DC motor , an armature rotates inside a magnetic field . The basic working principle of DC motor is based on the fact that whenever a current carrying conductor is placed inside a magnetic field, there will be mechanical force experienced by that conductor . All kinds of DC motors work under this principle. Hence for constructing a DC motor , it is essential to establish a magnetic field. The magnetic field is established by using a magnet. You can use different types of magnets – it may be an electromagnet or it can be a permanent magnet. A Permanent Magnet DC motor (or PMDC motor ) is a type of DC motor that uses a permanent magnet to create the magnetic field required for the operation of a DC motor.
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