Differential Compound Motor

March 21, 2024 Post a Comment

Differential compound motor

If flux produced due to both winding is adding in nature, then it is called cumulative DC generator. If flux produced due to both windings is subtractive in nature, then it is called differential DC generator.

Why differential compound motor is not used in industry?

The differential compound motor has poor torque characteristics because the motor increases the speed with increase in load. so this motor is not suitable for any practical application. On the other hand, the cumulative compound motor has high starting torque characteristic.

What is meant by a cumulative compound motor?

Cumulatively compounded DC motor: A compound wound DC motor is said to be cumulatively compounded when the shunt field flux produced by the shunt winding assists or enhances the effect of main field flux, produced by the series winding.

How do you start a differential compound motor?

In starting a differential compound motor the series field should be short-circuited, as the large starting current passing through the series field may be sufficiently large to overbalance the shunt field ampere-turns and cause the motor to start in the wrong direction.

What is the function of compound motor?

Applications of DC compound motor In shears and punches to provide high starting torque and better speed control for pressure variations. In steel rolling mills due to the requirement of high starting torque and heavy-duty load. In heavy planers due to the very high fluctuation of the load.

What are the 4 types of DC motor?

There are 4 main types of DC motors:

Permanent Magnet DC Motors. The permanent magnet motor uses a permanent magnet to create field flux.
Series DC Motors. In a series DC motor, the field is wound with a few turns of a large wire carrying the full armature current. ...
Shunt DC Motors. ...
Compound DC Motors.

What are the two types of compound motor?

The types of compound excited DC motors are short shunt motor, long shunt motor, differential compound, cumulative compound.

What are the disadvantages of compound motors?

Disadvantages of Compound Motors Operation and maintenance cost of DC motors are expensive. DC motors unable to operate in hazard situation where spark occurs at the brush of the motor. In generally Every DC motor using brushes so the lifetime of such motors is less compared with AC motors.

What are the uses of differential compound motor?

It has high starting torque and has varying speed within limits i.e. it has self-adjustable speed with changing the load. Hence, it is used for driving compressors, pressure blowers, door lifts, circular saws, passenger elevators, freight elevators, etc.

Which type of DC motor is best?

Series wound DC motors are best for applications that require high startup torque, without the need for speed regulation. Like a shunt motor, as a load is applied to a DC series motor, the motor speed decreases, which reduces the back EMF and increases the net voltage.

Which motor is used in lifts?

Both AC and DC types of electric motors are being used in the elevator services. According to different service requirements, there are different types of DC and AC motors are employed.

Where is DC compound motor used?

Compound DC motors offer both high starting torque and good speed control, making compound DC motors suitable for a variety of applications such as business machines, machine tools, agitators, shears, presses, and reciprocating machines.

What is a shunt motor?

A shunt motor is a "winding-field DC motor" that generates magnetic field flux using electromagnets. Its field winding and armature winding are connected in parallel. The shunt motor is configured with a stator of concentrated winding and commutator rotor as shown in the figure.

What is the main characteristic of a differential compound generator?

The differentially compounded dc generator comprises of both shunt and series field windings but their configuration is such that their generated flux cancel each that is contrary to cumulatively compounded generator.

Which motor is used in electric traction?

The DC motor was the mainstay of electric traction drives on electric and diesel-electric locomotives, street-cars/trams and diesel electric drilling rigs for many years. It consists of two parts, a rotating armature and fixed field windings surrounding the rotating armature mounted around a shaft.

What are the applications of differential compound generator?

Applications of Compound DC Generators Cumulative compound generators are used for lighting, power supply purposes and for heavy power services, etc. The differential compound generators are used for arc welding purposes where a large voltage drop and constant current is required.

Where is a compound generator used?

Cumulative compound generators (over compounded) are generally used for lighting, power supply purpose and for heavy power services like railways because of their constant voltage property; these are also used for driving a motor like elevator motor.

How many types of motor are there?

We know there are generally two types of motors, AC motor, and DC motor. AC motors are flexible for speed control and demand low power during start. On the other hand, DC motors are widely used due to its initial cost of low power units is less compared to AC and can be easily installed.

How many types of AC motors are there?

But, AC Motors are classified into two types: Synchronous Motor. Induction Motors.

What is a differential compound generator?

If the two windings are wound in such a direction that the fluxes produced by them oppose each other then the generator is called differential compound generator.