In the following article, we will discuss the different types of electric motors such as AC, DC and special types of motors etc. An electrical motor is mainly classified into three types. The AC electric motor converts AC (Alternating Current) electrical energy into mechanical energy.

The following are dimensional size charts for standard electric motor NEMA standard frames and configuration. Standardized motor dimensions are established by the National Electrical Manufacturers Association (NEMA) - are tabulated below and apply to all base-mounted motors listed herein that carry a NEMA frame designation

Drawings represent standard TEFC general purpose motors Refer Data Section 502 for various models, OPEN or TEFC *D im e ns oa rf c ly. Leader in Energy Efficient Industrial Electric Motors and Drives NEMAKeyseat NEMAKeyseat Shaft DimensionsShaft Dimensions (U)(R) (S)(U) (R)(S) 3/8 21/64 FLAT 1-7/8 1-19/32 1/2 1/2 29/64 FLAT 2-1/8 1-27/32 1/2

The motors can be classified by considerations such as power source type, construction, application, and type of speed output. Some different types of electric motors differ in how the conductors and the field are arranged.

Knowing how to read the information on a motor nameplate will allow you to identify performance characteristics and applications of a motor, as well as potentially solve unexpected performance issues. NEMA requires the following information on a nameplate (although more info may be included)