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Use this formula to estimate motor horsepower: Horsepower (hp) = Voltage x Amerage x % EFF x power factor x 1.73/746. (Refer to diagram below for details.)

## How do I choose the right motor?

Consider an application’s purpose and which current it uses to select the appropriate type of motor. An application’s specifications such as voltage, current, torque, and velocity will determine which motor is most appropriate so be sure to pay attention to its requirements.

## How do I know what size electric motor I need?

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.

## How do you size a motor?

Motor running current and voltage values should be measured and recorded on a routine basis as part of a preventive maintenance program. Use this formula to estimate motor horsepower: Horsepower (hp) = Voltage x Amerage x % EFF x power factor x 1.73/746.

## How do I choose a motor for my load?

A constant or variable torque and horsepower will be required for the industrial motor depending on the type of load the motor is driving. The size of the load, the required speed, and acceleration/deceleration—particularly if it’s fast and/or frequent—will define the torque and horsepower that is required.

## 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).

## What is the code for sizing the conductors for a single motor?

Branch-circuit conductors that serve a single motor must have an ampacity of not less than 125% of the motor’s FLC as listed in Tables 430.147 through 430.150 [430.6(A)]. You must select the conductor size from Table 310.16 according to the terminal temperature rating (60°C or 75°C) of the equipment [110.14(C)].

## How do you select a motor based on torque?

To calculate load torque, multiply the force (F) by the distance away from the rotational axis, which is the radius of the pulley (r). If the mass of the load (blue box) is 20 Newtons, and the radius of the pulley is 5 cm away, then the required torque for the application is 20 N x 0.05 m = 1 Nm.

## What does motor size mean?

What does engine size mean? Engine size may also be referred to as ‘engine capacity’ or ‘engine displacement’ and is the measurement of the total volume of the cylinders in the engine. The bigger the engine size, the more space there is for air and fuel inside it.

## What size breaker do I need for a 15 hp motor?

Full Load Current: Three Phase AC Motors

Motor Horsepower | Size Breaker | |
---|---|---|

10 | 230V 460V | 50 30 |

15 | 230V 460V | 70 40 |

20 | 230V 460V | 100 50 |

25 | 230V 460V | 100 50 |

## What are the different types of motors?

Types of Electric Motors

- 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 motor power rating is selected?

Continuous duty and variable load

the duty cycle is closely related to temperature and is generally taken to include the environmental factors also. v The rating of a machine can be determined from heating considerations. v However the motor so selected should be checked for its overload capacity and starting torque.