How we can control the speed of DC motor using chopper?
Chopper can be used as a converter to control the speed of separately excited DC motor. The speed control can be achieved above or below the rated speed. Controller receives the signal from the chopper firing circuit and then the chopper gives variable voltage to the armature of the motor for achieving desired speed.
How the speed of DC series motor can be controlled by means of DC chopper?
The speed control of DC series motor by using chopper is shown in the figure A. This speed control is achieved through constant frequency control or variable frequency control. When chopper CH is switched on, the DC motor gets input supply voltage Vdc.
Which DC chopper is suitable for speed control of DC motor in both the directions?
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.
How can a separately excited DC motor be controlled using a chopper?
The speed of Separately Excited DC motor is controlled to a maximum of its rated speed using chopper as a converter. The speed controller used is Proportional Integral type which reduces steady state error and provides fast control. The parameters of the speed controller have been designed using control system theory.
What are the advantages in using chopper for speed control of DC motors?
A chopper is a static power electronic device which changes stable dc input voltage to a adjustable dc voltage. chopper is used to step down or step up the stable dc input voltage. Chopper systems offer high efficiency, regeneration facility, smooth control, and faster response.
How can a step up chopper be used for the regenerative braking of DC motor?
During regenerative braking mode, the chopper is gated so that the motor armature is short circuited through the chopper. When chopper is turned off, freewheeling diode DFW, is turned on and the energy stored in inductance La is returned to the supply source (provided the source is receptive).
Which of the following methods are used to control the speed of DC motors is?
Speed adjustment of a DC series motor by armature control may be done by: Armature Resistance Control Method. Shunted Armature Control Method. Armature Terminal Voltage Control.
Why we use chopper controlled drive?
A chopper is a device that converts fixed DC input to a variable DC output voltage directly. Essentially, a chopper is an electronic switch that is used to interrupt one signal under the control of another.
Which of the following chopper is used in regenerative braking of DC motors *?
Class B Chopper is used for regenerative braking of dc motor.
What are the switching devices used in chopper?
The devices used in Choppers are IGBT, Power MOSFET, etc. (for lower power application) and SCR or Thyristor (for high power application).
Which of the following chopper is used in regenerative braking of DC motors?
A DC chopper is used in regenerative breaking mode of a dc series motor. The dc supply is 800 V, the duty cycle is 60%. The average value of armature current is 100 A. It is continuous and ripple free.
What is the need of speed control in 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.