What are the factors that control the speed of a dc motor? Describe Ward-Leonard system to control the speed of a dc motor
The speed of a motor is given by the relation. Where, R a = armature circuit resistance. So, the factors that control the speed of a dc motor are (i) flux/pole, Φ (ii) Resistance R a of armature circuit (iii) Applied voltage V Ward-Leonard system The Ward-Leonard system uses the armature control method of lowering the speed without the use of series resistors. A generator is used solely to supply the motor armature with the required voltage. The output of a separately excited generator is connected to the armature of the variable-speed motor. The motor is also separately excited. Varying the setting of the generator field rheostat changes the output voltage of the generator. The output of the gene...