Which chopper is used for motoring operation of dc motor?
The step-up chopper can be employed for regenerative braking of dc motors even at low operating speeds. Let V represent the motor armature voltage and Va the dc source voltage in Fig.
Which chopper is used for combined motoring and braking?
Thyristor chopper can also be used for electrio-braking of such drives, giving a combination of regenerative braking and resistive braking.
Which of the following chopper circuit is preferred for motoring operation of dc motor load?
Two Quadrant Chopper
For regenerative braking and motoring these type of chopper configuration is used. We will always get a positive output voltage V0 as the freewheeling diode FD is present across the load. When the chopper CH1 is on the current flows from source to load. The inductor stores energy.
Which chopper is also called as motoring chopper?
Hence Vo is zero and Io is positive. In type-A chopper it is seen that average value of Vo and Io is always positive. This is also called step down chopper as average value of Vo is less than the input voltage. This type of chopper is suitable for motoring operation.
What is a chopper?
A chopper is a type of custom motorcycle which emerged in California in the late 1950s. A chopper employs radically modified steering angles and lengthened forks for a stretched-out appearance. They can be built from an original motorcycle which is modified (“chopped”) or built from scratch.
Why the DC motor cost is higher than the AC motor by?
The rotor design is probably the most important factor in making the DC motor more expensive. If the DC motor stator has permanent magnets, that could make it more expensive or not depending on the magnet material. There are many more manufacturers making AC motors and many more AC motors used at 1000 kW.
What is class E chopper?
A four quadrant chopper is a chopper which can operated in all the four quadrants. The power can flow either from source to load or load to source in this chopper. … This type of chopper is also known as Class-E or Type-E chopper.
What is a VFD brake chopper?
Typically, a braking circuit (sometimes known as the “chopper” circuit) is controlled by the drive and consists of a power transistor and resistor(s) that are connected across the drive’s DC bus.
Which condition is true for a type D chopper?
This set of Power Electronics Multiple Choice Questions & Answers (MCQs) focuses on “Type D Chopper”. Explanation: It is a two quadrant (I and IV) type B chopper as load current is always positive but the voltage can be positive or negative. Explanation: It is a two quadrant (I and IV) type B chopper.
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.
What are the applications of DC chopper?
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.
- Class D electronic amplifiers.
- Switched capacitor filters.
- Variable-frequency drives.
What are the types of DC chopper?
Types of Chopper Circuits
- Type A Chopper or First–Quadrant Chopper.
- Type B Chopper or Second-Quadrant Chopper.
- Type -C chopper or Two-quadrant type-A Chopper.
- Type D Chopper or Two-Quadrant Type –B Chopper.
- Type –E chopper or the Fourth-Quadrant Chopper.
What are the advantages of DC chopper?
Advantages of dc chopper
- High efficiency.
- Flexibility in control.
- Small size.
- Quick response.
- Fast dynamic response.
- Smooth acceleration.
What is meant by step up chopper?
Step-up chopper is a static device whose average output DC voltage is greater than its input DC voltage. … In step-down chopper, the average value of output voltage stepped down i.e. it is less than its input voltage.
How many types of choppers are there?
There are two types of chopper, namely, Step-up and Step-down chopper.