Contents
What are the electronic methods of speed control for DC motors?
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.
How do you control the speed of a compound motor?
Speed control Methods Speed of compound DC motor can be controlled by changing the applied voltage, resistance of armature, or by changing the flux.
How can PWM be used to control the speed of a dc motor?
PWM (Pulse Width Modulation) One method that is often used for DC motor control using a microcontroller is Pulse Width Modulation (PWM) method. The speed of the electric motor depends on the modulator voltage. The greater the voltage, the faster the rotation of an electric motor.
How is speed control used in DC compound motor?
An increase in controlling resistances reduces the field current with a reduction in flux and an increase in speed. This method of speed control is independent of load on the motor. Power wasted in controlling resistance is very less as field current is a small value. This method of speed control is also used in DC compound motor.
How is the resistance of a DC motor controlled?
Here the controlling resistance is connected directly in series with the supply of the motor as shown in the fig. The power loss in the control resistance of DC series motor can be neglected because this control method is utilized for a large portion of time for reducing the speed under light load condition.
What are the different types of compound DC motors?
There are two major types of compound DC motors depending upon the connections of shunt field winding with the armature winding and series winding. Those two types are: In the case of long shunt compound DC motor, the shunt field winding is connected in parallel with both armature coil winding and the series field winding.
Which is DC generator has soft speed control?
The generator G is driven by a three-phase driving motor which may be an induction motor or asynchronous motor. The combination of ac driving motor and the dc generator is also called the motor-generator (M-G) set. This drive has a soft speed control of dc motor over a wide range in both directions. It has an inherent regenerative braking capacity.