The controlling of armature resistance controls the voltage drop across the armature. With this method, the speed of the DC motor can control. This method also uses a variable resistor in series with the armature.
Which method is not used for speed control of dc motor?
4. Which of the following is not the method of speed control in DC series motor? Explanation: Diverter means adding a variable resistance in parallel with field winding.
Which of the following method is used to control motor speed control?
Explanation: In field control method we change the flux produced by machine with the help of field current. If applied voltage is changed, definitely speed will change. By adding resistance in series with armature voltage of the armature can be varied to change the speed.
What are the speed control methods of induction and DC motor?
The speed controls of three phase induction motor from rotor side are further classified as: Adding external resistance on rotor side. Cascade control method. Injecting slip frequency emf into rotor side.
What is a speed control?
Definition of speed control
: equipment designed to operate automatically under certain conditions to keep the speed of a railroad train within a predetermined rate.
What are the methods of speed control of DC shunt motor?
Speed control of Shunt motor
- Flux control method. It is already explained above that the speed of a dc motor is inversely proportional to the flux per pole. …
- Armature control method. …
- Voltage Control Method. …
- Flux control method. …
- Variable resistance in series with armature. …
- Series-parallel control.
Which of the following is speed control method of DC motor Mcq?
DC Motor Speed Control MCQ Question 4 Detailed Solution
Ward-Leonard method of speed control is achieved by varying the applied voltage to the armature. Hence it is basically an armature voltage control method.
What is the another name for Rheostatic control method?
External resistance with armature resistance Ra (AKA Rheostatic Control Method). Flux per pole Φ (AKA Flux Control Method).
Which method is used to obtain speed control above rated speed?
Speed control of DC Shunt Motor
The flux of DC motor can be varied by varying Ish (shunt field current), with a rheostat in series with shunt field. As Ish in shunt motors is relatively small, Cu losses are also small. Thus this method is efficient for DC shunt motors. This method gives speeds above rated speed.
What are speed control methods of induction motor?
Speed Control Methods of Induction Motor:
- Control From Stator Side:
- Control From Rotor Side:
- Speed Control by frequency variation:
- Speed Control By Pole Changing:
- Speed control by varying Supply voltage:
- Speed control by varying Rotor Resistance:
- Speed control by injected EMF:
- Speed control by Cascade Connection:
What is speed control of induction motor?
By Injecting EMF In Rotor Circuit
Speed control of induction motor is done in this method by injecting a particular voltage in the rotor diagram. The injected voltage (emf) needs to have an equal frequency with the slip frequency. However, there is no limitation for the phase of that emf.
Which method of speed control is used for DC shunt motor to obtain speed below rated speed?
In a DC shunt motor, flux is constant. So, the back emf is directly proportional to speed. We can control the speed by increasing armature resistance. This method gives only below base speeds.
Why do we control speed of dc motor?
DC Motors plays an important role in energy conversion process. It is a machine which converts electrical energy into mechanical energy. In mechanical system, speed varies with number of task so speed control is necessary to do mechanical work in a proper way. It makes motor to operate easily.
What are 3 types of motor controls?
There are four basic motor controller and drive types: AC, DC, servo, and stepper, each having an input power type modified to the desired output function to match with an application.
Which is speed control circuit?
The above circuit uses a 4/2 manually operated dc valve to operate a double acting cylinder. Here two sets of metering valves with check valve are used which control the flow of air going to the cylinder. The speed control is achieved by controlling the air coming out from the cylinder.