Permanent magnet dc motors employ a permanent magnet instead of stationary field winding (as with the case of some other types of dc motors) for producing the required magnetic flux. These stationary magnets are normally fixed to the outer shell of the motor as illustrated in Figure 1.0.
The constructional features of permanent magnet dc motor are illustrated in Figure 1.0 below.
As shown in the figure above, the cylindrical steel stator supporting the stationary magnets also provides return path for magnetic flux as it is made up of magnetic material.
The armature (or rotor) consists of slots of windings, commutator segments and brushes same as those in conventional dc motors. The stator is having some structure having cylindrical shell of uniform thickness which is magnetized in radial direction.
The equivalent circuit of a permanent magnet dc motor is shown below:
This motor typically run on 6 V, 12 V, or 24 V dc supply. Because of the interaction between flux produced by permanent magnets and the current produced by the armature, torque is produced.
Related: DC Shunt Motor Speed Control
Recommended: The Ultimate Guide to Electrical Maintenance
Also read: AC vs DC Power & Motors – Differences and Benefits
Related: Electrical Motors
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