Diff between Slip Ring and Squirrel Cage Induction Motor

Welcome to the world of power electronics and motor drives.
I will not lie to you it is hard and your biggest enemy is noise and I am talking about serious electrical noise.

As to a book the best book you can get is:
"Power Electronics: Converters, Applications and Design"
by: N Mohan

Unfortuanatly it is not for sale in N.America. I dunno if you can get it for the "Windies" but if you can it will be your "Bible" Mine is always on my desk at work. It covers everything about power electronics,converters and motors

It has a good section abt machines to give an everview that motor drive engineers need.

A good machine book is:
"Electric Machines"
by: Mulukutla S.Sarma

It is very deep going into machine theory but if you can cope with it it is also very good.


As to Flemmings hand rules they are not used for direct application to motors. They are mainly used for straight wires. and where tHE wound move if you passed current through it in the present of a magnetic field.
Between Flemings and Lenz's laws they give you an instantanious state of a mag system. However, machine move and that state changes. Flamings rule is good to determine which way flux is being generated within a winding. From that just look at teh rotor and picture which way it would turn. - not as hard as it sounds

As to adding slip rings to a squirrel cage 1) you would end up having to put winding onto teh rotor and this goes against using squirrel cage also the induced field in the cage will interact with the field from the rotor winding and at work not turn at best very bad torque ripple.

Yep all slip-ring Induction machine have coils on the rotor so the the electrical power fed to the rotor can produce the rotor field needed for operation

If you want to learn more, please visit our website Wound Rotor Induction Motor Vs Squirrel Cage.

Time:

-10-05    

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For more information, please visit Wound Rotor Induction Motors.

1. The choice of the principle of AC electric motor

In order to accommodate a variety of uses, electric motor manufacturers can produce different types, structure type and 

capacity of three phase asynchronous motor and synchronous motor. In the selection of AC electric motors, to fully consider their characteristics, carefully studied the characteristics of the driven machinery and equipment, select the load characteristics of the motor.

The principle of selecting the ac electric motor is:
1) According to the starting characteristics of the load and operating characteristics, select the most suitable for these characteristics of the motor to meet the production machinery in the process of the various requirements. 2) A motor having a protection class and a cooling method suitable for use in an environment of a place of use should be adapted to the environmental conditions in which the motor is located.
3) Calculate and determine the appropriate motor capacity. Usually designed and manufactured motor, the 75% -100% rated load, the highest efficiency. Therefore, the capacity of the equipment should be the smallest and the difference in the capacity of the selected motor, so that the power of the motor can be fully utilized.
4) select the high reliability, easy to maintain the motor.
5) taking into account the interchangeability, try to choose the standard motor.
6) In order to make the whole system run efficiently, consider the number of poles and the voltage level of the motor.

2. The general steps to buy an AC electric motor can be considered as follows:
1) According to the requirements of the production of mechanical, select the motor type. Such as asynchronous motor include squirrel cage induction motor, slip ring induction motor, variable frequency motor, brake motor.
2) Depending on the power supply, select the motor rated voltage.
3) According to the number of revolutions required by the production machinery and the transmission equipment, select the number of revolutions of the motor.
4) According to the motor and production machinery installation location and place environment, select the motor structure and protection form.
5) According to the load required by the power capacity and the motor running mode, select the rated power of the motor.

In the selection of ac electric motor, to take into account the above factors, and communicate with the electric motor manufacturer to select the most suitable motor.

The principle of selecting the ac electric motor is:1) According to the starting characteristics of the load and operating characteristics, select the most suitable for these characteristics of the motor to meet the production machinery in the process of the various requirements. 2) A motor having a protection class and a cooling method suitable for use in an environment of a place of use should be adapted to the environmental conditions in which the motor is located.3) Calculate and determine the appropriate motor capacity. Usually designed and manufactured motor, the 75% -100% rated load, the highest efficiency. Therefore, the capacity of the equipment should be the smallest and the difference in the capacity of the selected motor, so that the power of the motor can be fully utilized.4) select the high reliability, easy to maintain the motor.5) taking into account the interchangeability, try to choose the standard motor.6) In order to make the whole system run efficiently, consider the number of poles and the voltage level of the motor.2. The general steps to buy an AC electric motor can be considered as follows:1) According to the requirements of the production of mechanical, select the motor type. Such as asynchronous motor include squirrel cage induction motor, slip ring induction motor, variable frequency motor, brake motor.2) Depending on the power supply, select the motor rated voltage.3) According to the number of revolutions required by the production machinery and the transmission equipment, select the number of revolutions of the motor.4) According to the motor and production machinery installation location and place environment, select the motor structure and protection form.5) According to the load required by the power capacity and the motor running mode, select the rated power of the motor.In the selection of ac electric motor, to take into account the above factors, and communicate with the electric motor manufacturer to select the most suitable motor.

If you are looking for more details, kindly visit Hv Electric Motor.