Why thyristors are not preferred now a days for chopper fed DC drives?
Since it requires commutation circuit, thyristors are not preferred now a days for chopper fed DC drives. The commutation circuit is complex for chopper circuits.
What is function of a free wheeling diode in a phase controlled rectifier?
What causes poor input power factor in phase controlled DC drives?
The input power factor in the phase controlled rectifier is low when the output voltage is less than the maximum, that is when the firing angle is large. When the firing angle increases, the converter draws more lagging reactive power. So the input power is low.
What are the advantages of three-phase drives over single phase drives?
What are the various control strategies for varying duty cycle of the chopper
What are the different methods of speed control of induction motors?
What are the advantages in operation of choppers at high frequency?
The operation at a high frequency improves motor performance by reducing current ripple and eliminating discontinuous conduction.
What is step angle in stepper motor?
Step angle is defined as the angle through which the stepper motor shaft rotates for each command pulse. It is denoted beta.
What is stepper motor?
A stepper motor is a digital actuator whose input is in the form of programmed energization of the stator windings and whose output is in the form of discrete angular rotation.
What is slewing in stepper motor?
A stepper motor operates at high speeds is called as slewing.
Define resolution in stepper motor?
It is defined as the number of steps needed to complete one revolution of the rotor shaft.
Resolution = No of steps/ Revolution
State some applications of stepper motor?
What are the advantages and disadvantages of the stepper motor?
Advantages
Disadvantages:
What are the different types of stepping motors?
What are the different modes of excitation in a stepper motor?
What is meant by half-step operation?
It is the alternate one-phase on and 2-phase on mode operation.
Here, the rotor rotate an each angle is half of the full step angle.
What is meant by full-step operation?
What is meant by micro stepping in stepper motor?
What is the main application of the micro stepping VR stepper motor?
What are the advantages and disadvantages of VR stepper motor?
Advantages:
Disadvantages
What is a multi-stack VR stepper motor?
Micro stepping of VR stepper motor can be achieved by using multistack VR stepper motor.
It has 3 separate magnetically isolated sections or stacks. Here the stator and rotor teeths are equal.
What are the advantages and disadvantages of permanent magnet stepper motor?
Advantages
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