# What are the different sizes of electric motors?

## What are the different sizes of electric motors?

Motors come in different horsepower categories, including: fractional motors (1/20th HP to 1 HP), integral horsepower motors (1 HP to 400 HP), and large motors (100 HP to 50,000 HP). RPM ratings include 3600 RPM (2 pole), 1800 RPM (4 pole), and 1200 RPM (6 pole).

### How do you size a motor?

Divide the motor speed by the required speed and round down to get a starting gear ratio. Then divide the required torque by the gear ratio to find the newly required torque. This will help you narrow the choices down to a few select motors.

#### What is the frame size of an electric 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.

How do I know what size electric motor to buy?

To determine the technical specifications, it will be necessary to determine the power, torque and speed of the motor. In order to determine the size, you must know how much space the motor will take up and how it is mounted (i.e.how it will be fixed in the system).

What are the 4 main motor types?

There are four basic motor controller and drive types: AC, DC, servo, and stepper, each having an input power type modified to the desired output function to match with an application.

## What are examples of electric motors?

Some of the most common electric motors used today include:

• AC Brushless Motors. AC brushless motors are some of the most popular in motion control.
• DC Brushed Motors. In a DC brushed motor, brush orientation on the stator determines current flow.
• DC Brushless Motors.
• Direct Drive.
• Linear Motors.
• Servo Motors.
• Stepper Motors.

### How do you size a motor controller?

The size of the conductor is determined by taking the largest FLC of the motors and multiplying it by 1.25 (430.24), and then adding the FLC of all other motors in the group: (27A×1.25)+14A=48A. Per 110.14(C) and Table 310.16, you would use an 8 AWG conductor rated 50A at 75°C.

#### What size is a 48 frame motor?

NEMA T FRAME DIMENSIONS

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

How do you find an electric motor?

The most accurate method to find a replacement motor is to cross-reference the manufacturer’s part number or model number from the motor itself. This number is usually found on the nameplate (label) of the motor along with the other nameplate data, such as horsepower, volts, etc.