Factors Affecting The Design Of An Ac Electric Induction Motor 3
By Baljeet
Factors affecting the Design of an ac electric induction motor
AC Electric Motor Design - Software
Softbit presents an easy way to design LT, 3 ph, TEFC, squirrel cage ac electric motors with the help of "AC Electric Motor Design Software". You just need to enter a few preliminary inputs and click a button. What you get is an output "Design Sheet" containing more than 100 output parameters required to build an ac squirrel cage electric motor. You can start to design from a small fractional horse power ac electric motor to a 200 hp ac electric motor using this design software. Higher hp modules are also available on request. You have the options to change any of the values from output design data to match your specifications and need. With the change in any of these values, the remaining parameters change automatically, without affecting the output design and performance of the motor.

What you can Change
You can change any parameter from the design data sheet like no. of slots, type of cage, material of cage conductor (Al or Cu), length of stator, bore of stator, core type / material, rotor dimensions, stator length, shaft diameter, shaft length, supply voltage etc.,. to get a better and most suited design for your requirement. Accordingly motor winding data will also change.

Why to change the output parameter
What ever results you get through this design software are as per calculations done using the formulae used to design a squirrel cage ac electric induction motor. Now suppose you get a rotor diameter as X and rotor length as Y but the job and place do not permit you to use these dimensions of rotor or say motor then you just change the value of either X or Y to best suit your requirement and all the related output parameters will change automatically. So you can customize the design as per yours, your client's or job's requirement.

A rotor of an ac electric motor designed with a high value of current density results in high starting torque and a lower efficiency for the ac electric motor. The current density of rotor bars of an ac electric motor may be taken between 4 to 7 A/mm sq. The flux density in the rotor core of an ac electric motor is generally equal to the stator core density of ac electric motor. The total losses in an ac electric motor are equal to the sum of total copper losses in ac electric motor, iron losses in ac electric motor, friction losses in ac electric motor and wind-age losses in ac electric motor. A small value of leakage reactance of ac electric motor means that the power factor of the ac electric motor is good.

The high starting torque of ac electric induction motor can be achieved by either using double cage rotor in ac electric motor or deep bar rotor in an ac electric motor. Design of shaft of an ac electric motor. The shaft of an ac electric motor must be strong enough throughout its section to withstand all loads causing residual strain. The diameter of shaft of ac electric motor in the bearings is less than the diameter under the armature of ac electric motor. Plain bearings are used for horizontal shaft ac electric motor and thrust bearings are used for vertical shaft ac electric motor.

Softbit provides CAD/CAM software packages for Electrical Machine Design, Industrial Automation products such as Remote Data Logger. Company aims to satisfy the current and future needs of its valued clients. We strive for customer’s satisfaction; our aim is technology dedication & continual improvements. www.softbitonline.com/ Power transformer design