What are the dimensions of the frame of an electrical motor?
Electrical Motors - Frame Dimensions Dimensions of electrical motor frames according NEMA 1984 are indicated below: 1 in (inch) = 25.4 mm 1 inch = 25.4 mm
What is the difference between a 48 and 56 frame motor?
The derivation of the two digit frame number is based on the shaft height in sixteenths of an inch. You can figure that a 48 frame motor will have a shaft height of 48 divided by 16 or 3 inches. Similarly, a 56 frame motor would have a shaft height of 3-1/2 inches. The largest of the current fractional horsepower
How much current does an induction motor draw when starting?
The starting or locked-rotor current is about 6.5 times the rated current. Depending on the design, today’s induction motors draw six to eight times rated current when starting. This motor is rated for continuous operation, meaning it can run 24 hours per day.
What is fractional horsepower on a motor?
FRACTIONAL HORSEPOWER MOTORS The term “fractional horsepower” is used to cover those frame sizes having two digit designations as opposed to the three digit designations that are found in Tables 1 and 2. The frame sizes that are normally associated with industrial fractional horsepower motors are 42, 48, and 56.
What is meant by frame size of induction motor?
The frame size of a motor defines its mechanical interface to attached actuators. Motors of the same frame size can have different power, torque etc. but feature the same geometrical properties. The length of the motor housing is not affected by the frame size.
What is frame size?
Body frame size is determined by a person's wrist circumference in relation to their height. For example, a man whose height is over 5' 5" and wrist is 6" would fall into the small-boned category.
What is the difference between 48 Frame and 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 56 frame electric 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 56. In terms of mounting, these motors can replace each other and other motors with the same frame size.
What is frame size of motor?
The frame sizes normally associated with 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. In these motors, specific frame assignments do not relate to horsepower and speed.
What is my frame size?
To know your body frame size, you should: Convert your height into inches; 6 feet is 72 inches. Divide your height measurement in inches by your wrist circumference measurement; the result should be 13. A body frame size index of 13, in men and women, indicates a small body frame.
What is a 56 frame size?
NEMA FRAMED*H(dia.)563 1/211/32 slot56H3 1/211/32 slot56HZ3 1/2**664 1/813/32 slot37 more rows
What is a 48 frame?
The derivation of the two digit frame number is based on the shaft height in sixteenths of an inch. You can figure that a 48 frame motor will have a shaft height of 48 divided by 16 or 3 inches. Similarly, a 56 frame motor would have a shaft height of 3-1/2 inches.
What is a 48 motor frame?
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 48. In terms of mounting, these motors can replace each other and other motors with the same frame size.
What does 56J frame mean?
The J suffix relates to a motor with a face mount for jet pumps and in the case of a 56J motor frame the distance from the mounting location shoulder outer face to the shaft end is 2 7/16". Also, the shaft end is threaded on this type.
What does the T mean in a motor frame size?
The letter T in a frame size tells you frame number that has been standardized by NEMA so that horsepower, speed, and certain dimensions will be the same for all motors with that frame size. These dimensions include the shaft diameter, shaft height, shaft length, mounting-base dimensions and bolt-hole sizes.
What is NEMA 23 frame size?
Step motors are categorized by NEMA frame size, such as "size 11" or "size 23" or “size 34”. Generally speaking, a size 11 step motor means the mounting face of the motor is 1.1 inches square; A size 23 step motor is 2.3 inches square; A size 34 step motor is 3.4 inches square, etc.
How do you measure a frame?
All frames are measured using the inside dimensions, height and width. So if you have a 30x40cm image, you need to order a 30x40cm frame. IIt's common to assume the dimensions relate to the outer edges.
What size is A4 frame?
Standard Metric 'A' picture frame sizes'A' SizeMillimetres (mm)InchesA2420 x 594 mm16.5" x 23.4"A3297 x 420 mm11.7" x 16.5"A4210 x 297 mm8.3" x 11.7"A5148 x 210 mm5.8" x 8.3"8 more rows
Is 8x10 a standard frame size?
Standard Photo Sizes in the USA (in inches) For example, if you're looking for a frame for a 4x6 inches picture and choose a frame with a 2-in wide molding, the outer dimensions of the frame will be 6x8 inches. Traditionally, the most common frame sizes have been 4x6, 5x7 and 8x10.
Is 12x16 A standard frame size?
We consider a 12x16 frame a standard size, which means it's available in all of our series.
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 is frame size in 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 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 is a 184 frame motor?
Sort & Filter. 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.
How do you determine engine 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 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 48 and 48Y frame?
The only difference between the 56Y and 48Y frame is the circumference of the motor. … 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.
Drip Proof
The NEMA definition for this type of enclosure is “a drip-proof machine is an open machine in which the ventilating openings are so constructed that successful operation is not interfered with when drops of liquid or solid particles strike or enter the enclosure at any angle from 0 to 15 degrees downward from the vertical.” In the drip-proof motor, the cooling air is drawn into the motor from the outside and comes into direct contact with the winding, rotor, and all other internal parts of the motor.
Totally Enclosed
A totally enclosed motor is designed to prevent the free exchange of air between the inside and the outside of the motor housing, but not sufficiently tight to be termed airtight. When the motor is equipped with an integral fan that blows air over the exterior surface of the frame, the motor is classed as being TOTALLY ENCLOSED FAN-COOLED (TEFC).
Totally Enclosed Fan Cooled
Cooling of TEFC motors takes place due to a continuous flow of air over the outside surface of the motor. The motor’s surface is usually ribbed to obtain additional surface area for heat dissipation. The airflow is produced by a fan that is mounted on the shaft at the front of the motor.
Space Heaters
Space heaters can also be installed inside the motor enclosure to heat the inside air and maintain an internal temperature above the ambient dew point. This assures that cooling air will not condense and produce moisture inside the motor. Space heaters available for motors are the wrap-around type.
Rotating Shaft Seals
Special protection is provided at the point where the motor shaft passes through the bearing housing in the form of an external flinger. This flinger keeps water, dust and other foreign matter out of the motor that might enter the motor along the shaft. All motors are furnished with a rotating neoprene flinger or machined metal labyrinth seal.
Sealed Leads
Additional protection against moisture is provided by a neoprene seal through which each motor lead wire is brought out of the motor frame to the terminal box. This is a standard feature for all TECO-Westinghouse motors.
Explosion Proof
The Standard explosion proof motor is to be used in all hazardous atmospheres listed under the following classifications:
What is a T on a motor?from hecoinc.com
These are commonly noted as a “T” on the nameplate. For example, if you have a 324T frame motor, every manufacture of motor will have the same shaft diameter, shaft length and bolt hole mounting dimensions, but be warned, your physical size of the motor may differ. There are other common letter suffixes that are also standard.
What does the suffix "S" mean on a motor?from hecoinc.com
“C” or “D” let you know that there is a flange on the drive end of the motor, or the “S” indicates that the motor has a short shaft.
What are the dimensions of a frame number?
In any standard frame number designation there are either two or three numbers. Typical examples of frame numbers are 48, 56, 145, and 215. The frame number relates to the “D” dimension (distance from center of shaft to center bottom of mount). For a two digit frame divide the frame number by 16 to arrive at this dimension. 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. 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 = 3½”. Similarly, the “D” dimension of a 213 frame motor is 5¼”, 21 divided by 4 = 5¼”.
What is a J frame motor?
J This designation is used with 56 frame motors and indicates that the motor is made for jet pump service with a threaded stainless steel shaft and standard 56C face.
What does NEMA mean in horsepower?
NEMA Frame/Shaft Sizes. Frame numbers are not intended to indicate electrical characteristics such as horsepower. However, as a frame number becomes higher, so in general does the physical size of the motor and the horsepower. There are many motors of the same horsepower built in different frames. NEMA (National Electrical Manufacturers ...
What is a two digit frame number?
By NEMA definition, two—digit frame numbers are fractional frames even though 1 HP or larger motors may be built in them. Three-digit frame numbers are by definition integral frames. Refer to NEMA Standard Dimension Chart and variations below.
What is a short shaft motor?
Short shaft motors have shaft dimensions that are smaller than the shafts associated with the normal frame size. Short shaft motors are designed to be directly coupled to a load through a flexible coupling (Love-Joy, etc.). They are not designed for use in belt drive applications.
What year is the T frame?
T indicates that the motor is of the 1964 and later T frame vintage.
What is a JP motor?
JP Similar to the JM style of motor having a special shaft, the JP motor was originally designed for a packing type of seal. The motor also has a C face.
Why is torque important in induction motors?
The torque is important because many loads are sized by the torque they require , rather than the horsepower.
How much current does a motor draw when starting?
The starting or locked-rotor current is about 6.5 times the rated current. Depending on the design, today’s induction motors draw six to eight times rated current when starting.
What is the NEMA code for a locked rotor?
From the nameplate, the NEMA code letter is G. From Table 2.For code G the expected locked rotor kVA is 5.6 to 6.29 kVA/HP. assuming the worst case, the locked-rotor (starting) apparent power can be calculated:
How many kVA does a 50 HP motor need?
This 50 HP motor requires 48.6 kVA when operating at rated conditions.
What does 50 HP mean?
This is the amount of power the motor is capable of delivering at the shaft on a continuous basis without exceeding its rated temperature. The example nameplate shows 50 HP. This does not mean the motor actually delivers 50 HP, however. The actual load will determine the power out of the motor. If the motor is fully loaded, the input to the motor will be larger than the rated horsepower, because the motor has losses.
What is the NEMA frame size?
NEMA defines standard frame sizes. This name-plate shows a frame size 326T. The frame size provides a standard for details such as the location of mounting holes, a height of the shaft above the mounting plate, etc. This allows motors from different manufacturers to be used in the same location.
What can be used to calculate apparent power requirement for a motor?
Rated voltage and current can be used to calculate the apparent power requirement for the motor, as shown by Example 1.
What does frame size mean on a motor?from bigelectricmotors.com
However, as a frame number becomes higher, so in general does the physical size of the motor and the horsepower. 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.
How many mounting holes are there in a 56H motor?from hecoinc.com
H: designated 56H motors have two sets of 2F mounting holes, 3 in. and 5 in.
What is standard duty motor?from hecoinc.com
Standard duty or general purpose motors are most often ODP or TEFC motors and are manufactured to meet NEMA premium efficiency regulations. These motors will most likely have either ball bearings or roller bearings if they are intended for an application with a belted high radial load.
What is a NEMA stepper motor?from omc-stepperonline.com
NEMA stepper motor sizes depend on the frame size of the stepper motor. NEMA means the standards set by “National Electrical Manufacturers Association”, which is comprised of 560 major electrical manufacturers in the United States, primarily consisting of manufacturers of equipment and devices for power generation, transmission, distribution, ...
What is the slip of a NEMA motor?from hecoinc.com
NEMA Class A motors have a maximum 5% slip with a high to medium starting current, normal locked rotor torque, and normal breakdown torque. These characteristics make them well suited for a wide vareity of applications and they are often found powering fans and pumps.
What is the maximum slip of a NEMA Class C motor?from hecoinc.com
NEMA Class C motors have a maximum 5% slip, low starting current, high locked rotor torque and a normal breakdown torque. They work well with conveyors and positive displacement pumps that require a high starting torque and high inertia at startup.
What does the letter T mean on a motor?from hecoinc.com
The letter T in a frame size (which we will talk about in a moment) tells you that the frame number has been standardized so that specifications such as horsepower, speed, and certain key dimensions will be the same for all motors with that frame size. The key dimensions will normally include things such as the shaft diameter, height, and length as well as mounting-base dimensions and bolt-hole sizes. You can also use the frame size to refer to tables of NEMA frame assignments to find out other specifications such as speed and power.
