What are the factors which influence the speed of the shunt motor?
The above equation shows that the speed depends upon the supply voltage V, the armature circuit resistance Ra, and the field flux Ф, which is produced by the field current. In practice, the variation of these three factors is used for speed control.
What are the ways of changing varying the speed of DC shunt motors?
Thus, the speed of a DC motor can be controlled in three ways: By varying the supply voltage. By varying the flux, and by varying the current through the field winding. By varying the armature voltage, and by varying the armature resistance.
How speed of the DC shunt motor can be increased *?
How speed of the DC shunt motor can be increased? Explanation: For a constant load, load current will remain constant. Decreasing armature current will help in increasing speed for DC shunt motor.
What affects the speed of a motor?
The rotating speed of an electric motor depends on two factors: its physical construction, and the frequency (Hz) of the voltage supply.
How do you increase motor speed?
Increasing the speed can be achieved by increasing the supply frequency as the speed and frequency are directly proportional; however, there are two constraints. The first is the saturation of the magnetic circuit, but this issue can be significantly avoided by keeping the V/f ratio constant.
What is the minimum speed limit of DC shunt motor?
Two adjustable-speed dc shunt motors have maximum speeds of 1800 r/min and minimum speeds of 500 r/min. Speed adjustment is obtained by field-rheostat control. Motor A drives a load requiring constant power over the speed range; motor B drives one requiring constant torque.
What will happen if excitation of DC shunt motor is changed?
If the excitation or field current is changed, the armature current changes, and back emf also will be changed accordingly and hence power will remain constant.
Which motor has the poorest speed control?
1. Which of the following DC motor has the poorest speed control? Explanation: DC series motor at no load condition gives infinite speed ideally. Practically it will damage all the armature circuit.