# How do you read motor frame size?

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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 3½”, 56 divided by 16 = 3½”. For the “D” dimension of a three-digit frame number, consider only the first two digits and use the divisor 4.

## How do you measure a motor frame size?

Just divide the first two digits by four. Thus, a 405 frame (original, U frame, or T frame) has a shaft height of 40 divided by 4, or 10 in. Although no direct inch measurement relates to it, the third digit of three-digit frame sizes is an indication of the motor body’s length.

## What is motor frame size?

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.

## What is a 56 motor frame?

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 56 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 a 180 frame motor?

A motor’s frame size is a reference to the size of the mounting footprint, shaft diameter, and shaft length. These motors are all frame size 180. In terms of mounting, these motors can replace each other and other motors with the same frame size.

## What size is a 48 frame motor?

Electrical motors NEMA frame dimensions.

NEMA Frame Designation Frame Dimensions (inches)
D E
42 2 5/8 1 3/4
42C 2 5/8 1 3/4
48 3 2 1/8

## What is the frame number on a electric motor?

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 3½”, 56 divided by 16 = 3½”.

## How do you read a motor nameplate?

The RPM listed on the nameplate is the shaft speed for the motor. The speed of the motor is directly related to the frequency of the line voltage and the number of poles in the motor. At 60 Hz, a 4 pole motor will rotate at approximately 1800 RPM (7200/4 poles).

## What does TC mean on motor frame?

Three-Phase Cast Iron T-Frame. TC-Frame (C-Face) TEFC Motors – Three-Phase Industrial Duty – 1 to 100 hp.

## What is a 184 frame motor?

A motor’s frame size is a reference to the size of the mounting footprint, shaft diameter, and shaft length. These motors are all frame size 184. In terms of mounting, these motors can replace each other and other motors with the same frame size.

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## Can I replace a 48 frame spa pump with a 56 frame?

The 48 and 56 barrel sizes are interchangeable as long as the frame shape matches (see below). To switch from 48 to 56 or vice versa requires a simple adjustment to the motor stand.

## What does NEMA 34 mean?

NEMA (National Electrical Manufacturers Association) 34 is a stepper motor with a 3.4×3.4 inch faceplate and 1.8° step angle. Each phase draws 4.0 A, allowing for a holding torque of 42 kg-cm. NEMA 34 Stepper motor is generally used in Printers, CNC machine, Linear actuators and hard drives.

## What does frame mean on a pump?

The “frame” means where do the bolts fit that attach the wet end to the motor. Most of the time you can find the frame listed on the label as either 48 or 56. Often with an F indicating that is the “frame” size. If you cannot find an indication of frame size you can measure between the thru-bolts on the pump.

## Are hot tub pumps interchangeable?

Most spas will be the same size for both the intake and outtake pipe, but double check just in case. Most spa pumps use 1.5” or 2” plumbing fittings. With all this information in hand, you should be able to select a new hot tub pump as a replacement.