How is chopper used in speed control of DC motor?
How is chopper used in speed control of DC motor?
One of the popular methods of speed control of DC motor is using chopper. Chopper is a device that gives variable DC output from applied fixed DC input. It simply chops fixed DC and generates variable DC.
What are three speed control methods for separately excited DC?
There are three main ways to achieve speed regulation in series DC motors–flux control, voltage control, and armature resistance control.
- Flux Control Method.
- Voltage Regulation Method.
- Armature Resistance Control Method.
How speed of the DC drive can be controlled using chopper?
Speed can be controlled from below and up to rated speed . The firing circuit of chopper receives signal from controller and variable voltage is given to the armature of dc motor according to the desired speed . There are two controllers we are using here one is speed controller and other is current controller.
What is a separately excited DC motor?
A separately excited dc motor is a motor whose field circuit is supplied from a separate constant-voltage power supply, while a shunt dc motor is a motor whose field circuit gets its power directly across the armature terminals of the motor.
What is chopper control of DC motor?
A dc chopper is a high speed on/off semiconductor switch that connects the load to and disconnects it from the supply and produces a chopped load voltage from a constant input supply voltage.
How does a DC chopper work?
DC chopper works on DC voltage. They work as a step up and step down transformers on DC voltage. They can convert the steady constant DC voltage to a higher value or lower value based on their type. DC choppers are more efficient, speed and optimized devices.
What is the name of the speed control method of DC motor?
Armature Control Method With this method, the speed of the DC motor can control. This method also uses a variable resistor in series with the armature.
Which mode is used for speed control of DC motor?
The speed control of DC Motor using both PI and Sliding mode controllers is studied and the results are compared. The simulation results show that Sliding mode controller is superior than PI for speed control of DC motor. Since the SMC is robust in presence of disturbances, the desired speed is perfectly tracked.
What is the advantage of separately excited DC motor?
Separately excited DC generators have many advantages over self-excited DC generators. It can operate in stable condition with any field excitation and gives wide range of output voltage. The main disadvantage of these kinds of generators is that it is very expensive of providing a separate excitation source.
How to control speed of DC motor with Chopper?
One of the popular methods of speed control of DC motor is using chopper. Chopper is a device that gives variable DC output from applied fixed DC input. It simply chops fixed DC and generates variable DC. Let us first understand how it generates variable DC. As shown in figure the chopper supplies fixed DC voltage to motor.
How to control the speed of a separately excited DC motor?
Speed control techniques in separately excited dc motor By varying the armature voltage for below rated speed. By varying field flux should to achieve speed above the rated speed.
What is the function of DC motor speed control?
It connects source to load and disconnect the load from source at a fast speed [4] 1-2- Basic idea : The basic principle behind DC motor speed control is that the output speed of DC motor can be varied by controlling armature voltage for speed below and up to rated speed keeping field voltage constant.
What is the function of the chopper in DC Circuit?
The chopper converts the fixed DC voltage to variable DC voltage. Self-commutated devices (directly on or off devices via gate) like MOSFET, IGBT, power transistors, GTO and IGCT are used for making choppers because they can be commutated by low power control signal and do not need commutation circuit.