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 does motor frame size mean?
There are many motors of the same horsepower built in different frames. 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.
What information do we get from motor frame size?
The Frame Size Designation provides information about the motor frame size, the mounting type, and the dimensions according to the NEMA standard. NEMA has assigned a series of standardized numbers and letters to describe the various dimensions and mounting types of common motor frames.
What is frame size of induction motor?
In fractional horsepower motors the frame sizes are two digits and represent the shaft height of the motor from the bottom of the base in sixteenths of an inch. For example, a 56-frame motor would have a shaft height (“D” dimension) of 56/16 of an inch, or 3.5 inches.
What is a 56 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 3½”, 56 divided by 16 = 3½”.
What is meant by frame size?
Frame size generally refers to frame height, the length of the seat tube from the bottom bracket (crank bearing) to the top tube. … Also, frames are measured differently. Some companies measure from the center of the bottom bracket to the center of the top tube/seat tube junction.
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 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. Because of the different motor sizes, you will need to adjust the relative heights of pump and motor so that they line up properly if you mix the frames.
What is a JM motor frame?
JM (Short) Shaft Extension
With a JM shaft extension, the distance from the inboard motor bearing to the seal face is shorter than with a JP shaft.
What is short time rating of motor?
A short time rating of an electric motor can be defined as the extrapolated overload rating of the motor which it can supply for the specified short time without getting overheated. Now a days the machines are being designed and manufactured for short duration having sufficient overload torque capability.
Why are motors rated in horsepower?
At the other hand, Motor has fixed Power factor, i.e. motor has defined power factor (p.f) and the rating has been mentioned in kW on Motor nameplate data table. That’s why we are rated Motor in kW or HP (kilowatts/ Horsepower) instead of kVA.
What is SF on electric motor?
Motor Service Factor (SF) is the percentage of overloading the motor can handle for short periods when operating normally within the correct voltage tolerances.
What are 4 common types of motor enclosures?
The most common types of enclosures are:
- Open Drip Proof (ODP) …
- Weather Protected (WP1 / WP2) …
- Totally Enclosed Fan Cooled (TEFC) …
- Totally Enclosed Non-Ventilated (TENV) …
- Totally Enclosed Air Over (TEAO) …
- Totally Enclosed Forced Ventilated (TEFV) …
- XP (Explosion Proof)
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 is a NEMA frame 56 motor shaft diameter?
NEMA electrical motor frame dimensions
|NEMA Frame Designation||Frame Dimensions (inches)|