# Your question: How do you size a motor?

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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 sizing a motor?

Motor Sizing Motor sizing refers to the process of picking the correct motor for a given load. … If a motor is too small for an application it may not have sufficient torque to start the load and run it up to the correct speed.

## 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 calculate motor power?

By taking the voltage and multiplying it by the associated current, the power can be determined. A watt (W) is a unit of power defined as one Joule per second. For a DC source the calculation is simply the voltage times the current: W = V x A.

## How do you calculate motor load capacity?

When calculating motor loads, you need to know how to convert a motor’s current rating (given in amps) to a VA rating. To do this, multiply the motor’s nameplate amperage by the supply voltage.

## 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 I choose a motor and gearbox?

Basics of Gearbox Selection

1. Service Factor. Before sizing an application, the customer should determine the service factor. …
2. Ambient Temperature and Environment. …
4. Output Style or Mechanism. …
5. Output Shaft or Hollow Bore Size. …
6. Housing Styles.

## How do you calculate engine requirements?

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.

## How do I choose an engine horsepower?

Determining actual motor horsepower

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

## What is the rpm of 1 hp motor?

1 HP Single Phase Electric Motor, For Industrial, Speed: 1440 Rpm.

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## What is the torque of a motor?

Torque: The torque output of a motor is the amount of rotational force that the motor develops. The torque of a small electric motor is commonly measured in either inch pounds (in-lbs), Newton meters (N-m) or other directly converted units of measure.

## How do you find the KW of a motor?

Multiply the motor voltage by the full-load current. The result is in watts. Divide watts by 1,000 to give kilowatts. For example, 230 volts x 20 amps = 4,600 watts; 4,600 watts divided by 1000 = 4.6 kilowatts.