Factors Affecting of an Ac Induction Motor Design

Factors Affecting the Design of an

Ac Electric Induction Motor1

Author: Baljeet

Factors affecting the Design of an ac electric induction motor

Design of an ac electric motor is directly affected by the length of the air gap. Ampere Conductors value also affects the design of an ac electric motor.

The value of average flux density over the air gap of an ac electric motor also affects the design of an ac electric motor. The size or dimensions of an ac electric motor depend upon the speed of an ac electric motor. It can also be said that the volume of active parts of an ac electric motor varies inversely as the speed of an ac electric motor. The value of output co-efficient is directly responsible for the dimensions of an ac electric motor. In other words the volume of active parts of an ac electric motor is inversely proportional to the value of output co-efficient of the ac electric motor.

The total flux around the armature (or stator of an ac electric motor) periphery at the air gap is called the total magnetic loading. While total electric loading is the total number of ampere conductors around the armature (or stator of an ac electric motor) periphery. Since the output coefficient of an ac electric motor is proportional to the product of specific magnetic and specific electric loading of an ac electric motor, we conclude that the size and hence the cost of ac electric motor decreases if increased values of specific magnetic and electric loading are used. The flux density in iron parts of an ac electric motor is directly proportional to the average flux density in the air gap of the ac electric motor. In a well designed ac electric motor the maximum density occurs in the teeth of the ac electric motor and therefore let us relate the flux density in the teeth with flux density in the air gap of ac electric motor.

The magnetizing current of an ac electric motor is directly proportional to the mmf required to force the flux through the air gap and the parts of the ac electric motor. The mmf required for the air gap of an ac electric motor is directly proportional to the gap flux density i.e. the specific magnetic loading of an ac electric motor. The consideration of magnetizing current is very important in ac electric induction motor(s) as an increased value of magnetizing current means of a low operating power factor of ac electric motor. Therefore specific magnetic loading in the case of ac electric induction motor(s) is lower than that in dc electric motor(s).

The core loss in any part of the magnetic circuit of an ac electric motor is directly proportional to the flux density for which the ac electric motor is going to be designed. Thus a large value of specific magnetic loading in an ac electric motor indicates an increased core loss in ac electric motor and consequently a decreased efficiency of ac electric motor and an increased temperature rise of ac electric motor. In case of high frequency ac electric motor, specific magnetic loading must be reduced in order to get lower iron losses in ac electric motor so that reasonable values of efficiency may be maintained in an ac electric motor. The maxmium temperature rise of an ac electric motor is determined by the type of insulation material used in the ac electric motor. If the cooling co-efficient of the ac electric motor is small, a high value of specific loading may be used in the ac electric motor.

About the Author:

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. http://www.softbitonline.com/ ac electric motor

Article Source: http://www.articlesbase.com/business-articles/factors-affecting-the-design-of-an-ac-electric-induction-motor1-222242.html

Factors affecting the speed-torque characteristics of an Induction motor :

The speed-torque characteristics are affected by various factors like applied voltage, R2’ and frequency.

(a) Applied voltage : We know that T µ V2. Thus not only the stationary torque but also the torque under running conditions changes with change in supply voltage.

(b) Supply frequency : The major effect of change in supply frequency is on motor speed. The starting torque is reduced with increase in frequency.

(c) Rotor resistance : The maximum torque produced does not depend on R2’. However, with increase in R2’, the starting torque increases. The slip at which Tmax is reached increases too which means that Tmax is obtained at lower motor speeds
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AC Induction Motor Design Software

Electric Motor Design Software
AC Induction

FEATURES
- Microsoft ® Windows™ based program
- Analysis tool used in design of Poly Phase and Single Phase Motors,
including Capacitor Start, PSC and Split Phase
- Computes all relevant motor parameters
- Allows printing of inputs, outputs & graphs
- Multi-window tasking
- Important constants built into program
- Variable definitions instantly available on screen
- Reduces development cycle time and cost
- Instantly check effects of design change
- Maximizes material usage
- On-line design tips
- Reduce number of prototype iterations

more

Ac Electric Motor Design – Software1

Author: Baljeet

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.

Values you need to enter at the start

When you start designing a squirrel cage ac electric motor, certain preliminary values are required to be fed to the software to give the out put parameters. So you need to enter - capacity of motor in hp / kw, poles, supply voltage, rpm, frequency and certain more that the software will ask you at the time of start.

About The Software

The software has been developed keeping in mind to give our design engineers and professionals more flexibility while they are designing a squirrel cage ac electric motor. This window based software is very much user friendly. It gives you numerical, pictorial and graphical out puts to easily understand various design data values. It is flexible enough so that you can change any output design data value as per your requirement and get the changed values instantly, without affecting the final design and performance of motor. Its worth buying as it saves time, energy, gives more accurate results in shortest time, data comparison easy.

Factors affecting the Design of an ac electric induction motor

"An electric motor converts electrical energy into rotating mechanical energy or an electric motor is a machine that converts electrical energy into rotating mechanical energy. AC electric motor works on the principle of electro - magnetic induction".

Who Should Buy?

Every professional linked with motor design, QC, production, purchase, maintenance, repairer & re-builders, training professionals, engineering students, end users of electric motors must posses this motor design software.

Price v/s Benefits

This software is developed for the engineers with an aim to get high productivity and easy to learn features, with full documentation that includes extensive information on machine theory and design. Motor design with this simulation is interactive and fast. However, this software does not do the engineer's job. It is simply a specialized calculating tool to assist the design engineers with initial sizing and preliminary design of a motor by providing a simple intuitive interface and quick simulation.

About the Author:

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. http://www.softbitonline.com/ Power transformer design

Article Source: http://www.articlesbase.com/business-articles/ac-electric-motor-design-software1-222240.html