What are the methods of speed control of DC shunt motor?

What are the methods of speed control of DC shunt motor?

Thus, there are three general methods of speed control of D.C. Motors.

• Resistance variation in the armature circuit: This method is called armature resistance control or Rheostat control.
• Variation of field flux Ф This method is called field flux control.
• Variation of the applied voltage.

What are the two basic methods of speed control of DC motor?

Thus, the speed of a DC motor can control in three ways: By varying the flux, and by varying the current through field winding. By varying the armature voltage, and the armature resistance. Through the supply voltage.

Which method of speed control is used for DC shunt motor to obtain speed below rated speed?

This set of DC Machines Multiple Choice Questions & Answers (MCQs) focuses on “Speed Control Using Field Control of Shunt Motor”. Explanation: Speed of the DC motor is directly proportional to the back emf and inversely proportional to the flux produced by field.

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?

Explanation: DC series motor at no load condition gives infinite speed ideally. Practically it will damage all the armature circuit. Thus, as the load is reduced speed of the motor will go on increasing rapidly. So, speed control is very poor in series motor.

What are the advantages of DC shunt motor?

Advantages of Dc shunt motor:

• The power supply of the DC motor is any way cheap.
• Shunt would motor able to runs at a predetermined speed.
• The speed of a dc shunt motor is sufficiently constant.
• Direct current machines can use for heavy industrial applications where the torque and speed wider range.