What is the frame size of an electric motor?

The frame sizes that are normally associated with industrial fractional horsepower motors are 42, 48, and 56. In this case, each frame size designates a particular shaft height, shaft diameter, and face or base mounting hole pattern.

How do you measure an electric motor frame?

The frame number relates to the “D” dimension (distance from center of shaft to center bottom of mount). For example, in the two-digit 56 frame, the “D” dimension is 31/2”, 56 divided by 16 = 31/2”.

What does frame mean on electric motors?

NEMA (National Electrical Manufacturers Association) frame size refers to mounting only and has no direct bearing on the motor body diameter. In any standard frame number designation there are either two or three numbers. Typical examples of frame numbers 48, 56, 145, and 215.

What does 48Y frame mean?

The Flex-frame motors are usually labeled as 48Y, but will have the distinct pedestal at its base. The Flex is unique because it uses four thin partially threaded screws (known as thru bolts) that are slid the length of the motor through the back end and screwed into the seal plate.

What is a 56 frame motor?

Specifically “Frame” refers to the diameter of the armature in the motor. Although 2 motors may have the same horsepower rating, a 56-Frame motor will be 40% larger. It will also run cooler and last longer.

What is the difference between a 48 frame motor and a 48Y frame motor?

The main difference between a 48 frame and a 56 frame hot tub pump is that the 48 frame has a smaller motor housing and so the 4 through bolts that fasten the wet end to the motor are closer together on the smaller motor.

What is the difference between 48Y and 56Y frame?

The only difference between the 56Y and 48Y is the circumfrence (width) of the motor. They will both mount to the seal plate but the 48Y will need an optional spacer (that comes with the motor) to sit on to make up for the difference in size.

How do you waterproof an electric motor?

The most common, and most effective, methods of waterproofing electric motors include: Specialized casing: Covering an electric motor in a specialized casing is one of the most common ways of creating some protection against water damage. Specialized cases are expensive.

What is a drip proof electric motor?

An open drip proof or ODP motor is a type of motor that typically runs cooler and does not overheat. A benefit to having the motor totally enclosed is that it’s protected from the outside environment, including dust, airborne contaminants, and many weather disturbances such as wind-driven rain.

What size is a 48 frame motor?


Nema Series D H
48 3 11/32 Slot
56 56H 3 1/2 11/32 Slot
143T 145T 3 1/2 11/32
182T 184T 4 1/2 13/32

What is the difference between a 48 and a 48Y frame motor?

The only difference between the 56Y and 48Y frame is the circumference of the motor. They will both mount to the seal plate of the pump.