Ac Electric Motor Frame Size

The mystery of motor frame size primer on two speed motors.

Ac electric motor frame size.

Size 56 frame motors are the largest of the fractional horsepower rated motors are may actually be found in horsepower ratings up to 3 hp and in some rare cases 5 hp. 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 mystery of motor frame size introduction industrial electric motors have been available for nearly a century. Another important achievement has been the standardization of motors by the national.

Cage 3 phase induction motors lower than 1000v and smaller than 315 frame size can safely run continuously at the speed in the table below. For this type of frame you will have to get clarification on dimensions from the motor oem. Dimension v is shaft length available for coupling pinion or pulley hub this is a minimum value. By nema definition two digit frame numbers are fractional frames even though 1 hp or.

For the squirrel cage 3 phase induction motors of 1000v or lower. Now you do have to be careful in regard to medium voltage or high voltage motor frame sizes as these are not regulated like the nema frames. Base of 56hz frame motors has holes and slots to match nema 56 56h 143t and 145t mounting dimensions. Therefore a size 48 frame motor will have a shaft height of 48 16 3 inches.

A 56 sized frame motor would have a shaft height of 3 1 2 inches. Electrical induction motors synchronous speed the speed at which an induction motor operates depends on the input power. Electrical electrical units amps and electrical wiring wire gauge and awg electrical formulas and motors. In that time there have been a great many changes.

Please refer to the large ac motor chart or to the specifi c motor drawings for l449t dimensions. Keyseat dimensions frame 42 48 56 56h 143t 145t 182 184 182t 184t 213 215 213t 215t 254u 256u 254t 256t 284u 286u 284t 286t 284ts 286ts 324u 326u 324t 326t 324ts 326ts 364u 365u 364t 365t 364ts 365ts 404u 405u 404t 405t 404ts 405ts 444u. Nema motor dimensions reference chart. Certain nema 56z frame motors have 1 2 x 1 1 2 long shaft with 3 64 flat.

And use the divisor 4. In frame number 145 for example the first two digits divided by the constant 4 is equal to the d dimension 14 divided by 4 3. 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. Similarly the d dimension of a 213 frame motor is 5 21 divided by 4 5.

One of the most obvious has been the ability to pack more horsepower in a smaller physical size. Frame size 2 pole 4 pole 6 pole 100 5200 3600 2400 112 5200 3600 2400 132 4500 2700 2400 160 4500 2700 2400. Baldor electric company p o. Electric motor efficiency calculate electric motor efficiency.

In that time there have been a great many changes. Industrial electric motors have been available for nearly a century.