Motor Design

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While designing, you will have to consider all aspects of speed and performance for both motor and generator.

How big is your motor consider with the generator size. Usually generator 2 x motor rate kW

Dear Sir,

Please read " Performance and Design of A.C. Machines"-by Mr.M.G.Say

which was my Bible during my engg. days & even now for any doubts.

Manroop.Chennai.

How can you design a motor if YOU do not know the speed . . the torque . . . and the power you need?

Go to school and learn a few things . . .

Oleh

Dear Sir, reading your issue I think You want to size an engine to drive a genset. If so, I going to share this information with You. Ususally for any application, this is my point, when someone is intending to size the right engine, looks for the operating speed of the driven equipment (generator) to set the driver speed (engine). Generators comes from factory rated at certain frecuency, 50 or 60 Hz, and first of all, to select the engine, You must understand that the engine will run at certain speed according to the frecuency; 1,500 or 3,000 rpm for 50 Hz, and 1,800 rpm or 3,600 for 60 Hz. After this, You must choose the right power for the engine, in the way to cover the generators' output power; some fellow give You an idea how to do it before. Besides some other considerations should be done: Height over sea level, temperature, and relative humidity in site where You might installed your engine.

First and foremost is the power out put required in KW or HP.Then the speed and whether it is constant or variable.Ambient temperature,environment, Starting current allowed, Permitted temp rise, method of starting DOL, VFD, SS or others.Like this there are other factors.Once you decide the rating and speed the torque 9Full load) is fixed,Max torque required , Starting and accelerating under lower voltages (in India we have to have motors start and accelerate at 80% of the rated voltage,etc.It is diificult to cover all aspects.As suggested say is a good back.There are many other books like motor hand book by Smeaton and so on.Now mostly soft ware is used.Apart from electrical aspects mechanical aspects also have an impact on the design.like whether is direct coupled opr through belt,Vibrations limit, driven equipment,etc.