Suppose a dc motor is running at no load. That means no conveyor belt or any other type of gear fitted with the shaft of the motor and the shaft is free to rotate. Now assume the load is put on the shaft by means of conveyor belt or gear etc. After applying the load there may be a change of speed of the motor. The term speed regulation refers to the change in speed of a motor with change in applied load.
The speed regulation is defined as the change in speed when the load on the motor is reduced from rated value to zero, expressed as percent of the rated load speed.
The speed at which the motor rotates when no load is applied to the rotor shaft is referred as no load speed.
The speed, at which the motor rotates when full rated load is applied to the motor shaft, is referred as full load speed.
Now speed regulation of dc motor is referred as the difference of no load speed and full load speed expressed as percentage of full load speed.
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