AC Motors - Insights

Well, that is a very large question to ask, the new design AC motors would definitely have to match the controlling circuitry and the purpose design for the equipment. Some motors have built in control circuits that are not interchangeable with other equipment uses.

Development of solid state electronic drives like VFD, thyristors, soft starters Development of hybrid vehicle technology, battery technology Development in electromagnetic technology Design and analysis software

Monitoring equipment, motor attachments (types of encoders etc.), drives, more permanent magnet materials

I would say the newest manufacturing companies, as these companies have to compete with other competitors.

Kirloskar Electric Company Limited Siemens

Mitsubishi Electric, Toshiba, ABB, Siemens

Now a days AC motor become more popular as they are simple in construction, relatively low manufacturing costs and less maintenance required. In all industries we can see the application of AC motors. From last few years AC motors are replacing the DC motors in electric traction drives. Below is the list of application of AC motors: In hybrid electrical vehicles like cars, motorcycles In compressors, crushers, pumps, conveyors, cranes, blowers In CNC machines, Lathe machines,etc In power grids In washing machines

As a prime mover for testing AC Generators, Textile Mills, Lathe Machines, Industrial Pumps, Flour Mills, Conveyors, Flame proof Motors in Coal Mines, Oil Mines etc.

Standard DOL and star delta starting for auxiliary and ancillary drive applications. Speed control applications to replace previous DC motor control applications.

Focusing cameras on space vehicles, rotating domes for space exploration, testing nuclear setting devices for nuclear subs, separating virus from blood in centrifuge (300,000 RPM) in AIDS research, test stands for aerospace and automotive applications, poi manufacturing, people moving rides at amusement parks.

The most frequent non-standard use I have made of AC motors is using them for positioning, as cost effective alternatives to servos where absolute highest performance is not required.

Electric cars, go carts, wind generation, and in some cases depending on the design of the motor, small wind turbines.

Don't operate the induction motors under the locked rotor condition. Because under locked condition motor will draw very high in rush current usually 6 to 7 times of full load current. There is a chance of burning the motor and other equipment connected to same supply.

Yes, working for a large FMCG company they ordered the wrong motors for a complete new production line.

I'm sure there have been cases of fire or machinery damage, none come to mind immediately.

For ease of production compatibility it has to be a controller circuit built on the outside of the motor casing that could if necessary be interchangeable to other motors of same horse power and size.

Hazardous area motors to have the ability to add flanges to foot mounted motors without needing to open the motor, thereby potentially invalidating the safety.

Nothing comes quickly to mind. Current generation, high quality VFDs have control algorithms that accommodate most of the issues with AC motors.

Induction motors give the maximum efficiency at 85 to 100% Full load. Hence don't go for an over sized motor. For VFD application motor always prefer Class H insulation rather than Class F. To reduce the starting current effect use starters instead of DOL.

Frame selection and connection position. Beware of Y/delta start characteristics on change over with regard to installed protection devices.

Explain your application to a knowledgeable salesman. Review the load profile, frequency of start and stops, transient loading, etc.

Check the voltage requirement, amount amps required, rpm's and the application that it is used for.

Try to get some brand that can offer spare parts and maintenance advice near from you

Look for quality. Study the cost of energy...It is 97% of the cost of ownership.