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. So as duty cycle is varied by varying on and off time of chopper, the speed of motor can be varied.

How can the speed of a DC motor be controlled?

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 DC chopper is suitable for speed control of DC motor in both the directions?

Insulated Gate Bipolar Transistor (IGBT)
The Insulated Gate Bipolar Transistor (IGBT) is used for speed control of DC motor which is very smooth in operation. The chopper circuit is designed by Insulated Gate Bipolar Transistor (IGBT) to control the speed of DC motor in both direction.

What are the applications of chopper controlled DC drives?

Chopper circuits are used in multiple applications, including: Switched mode power supplies, including DC to DC converters. Speed controllers for DC motors. Driving brushless DC torque motors or stepper motors in actuators.

What are the advantages of DC chopper?

Advantages of dc chopper

• High efficiency.
• Regeneration.
• Flexibility in control.
• Lightweight.
• Small size.
• Quick response.
• Fast dynamic response.
• Smooth acceleration.

What is the principle of chopper?

Principle of Operation For all type of chopper circuit, the output voltage value is controlled by periodic closing and opening of the switches used in the circuit. The chopper can be viewed as an ON/OFF switch that can rapidly connect or disconnect the source to load connection.

Why do we need to control the speed of a 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 the applications of dc motor?

Application of DC Series motor

• Cranes.
• Air compressor.
• Lifts.
• Elevators.
• Winching system.
• Electric traction.
• Hair drier.
• Vacuum cleaner and in speed regulation application.

What is the speed of dc motor?

DC controls adjust speed by varying the voltage sent to the motor (this differs from AC motor controls which adjust the line frequency to the motor). Typical no load or synchronous speeds for an AC fractional horsepower motor are 1800 or 3600 rpm, and 1000-5000 rpm for DC fractional hp motors.

What are the advantages and disadvantages of DC chopper?

➨Switching converters are prone to noise. ➨They are expensive. ➨Choppers are inadequate due to unsteady voltage and current supply. ➨Disadvantages of fly-back type: More EMI due to gap, More ripple current, More input/output capacitance, higher losses etc.

What are the applications of chopper?

Applications of Choppers:

• They are used for DC motor control (battery-supplied vehicles), solar energy conversion and wind energy conversion.
• Choppers are used in electric cars, airplanes and spaceships, where onboard-regulated DC power supplies are required.

How is speed control done with a 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.

How is a chopper used in DC motor?

Application of chopper in DC Motor 1) For regenerative braking of DC motor 2) Power control or motoring control 3) Choppers are used in electric cars, airplanes and spaceships, where onboard-regulated DC power supplies are required. 11. Simulation Result The simulink model of speed control of DC motor is shown in figure 4.

How to control the speed of a DC motor?

Abstract The speed of a d.c. motor is given by relationship N= ( V- Ia Ra)/kΦ Speed of dc motor can be varied by following methods  Armature voltage control (for below base speed)  Field flux control (for above base speed)  Armature resistance control Here, we are using armature voltage control method for speed control.

When to use closed loop DC motor controller?

The controller used in a closed loop model of DC motor provides a very easy and common technique of keeping motor speed at any desired set-point speed under changing load conditions. This controller can also be used to keep the speed at the set-point value when the set-point is ramping up or down at a defined rate.