Enter the mass of the object, the velocity of the raise motion, and the efficiency of the hoist into the calculator to determine the power.

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## Hoist Motor Power Formula

The following equation is used to calculate the Hoist Motor Power.

HMP = m*g*V / N

- Where HMP is the hoist motor power (watts or joules/s)
- m is the mass (kg)
- g is the acceleration due to gravity (9.81 m/s^2)
- V is the velocity of the raising motion (m/s)
- N is the efficiency of the hoist (i.e. efficiency loss due to gears)
- This is typically around 60% = .60

## What is Hoist Motor Power?

Definition:

A hoist motor power is the required amount of power output that a hoist motor must be able to produce in order to raise an object of a given mass at a specific velocity.

## How to Calculate Hoist Motor Power?

Example Problem:

The following example outlines the steps and information needed to calculate Hoist Motor Power.

First, determine the mass of the object. In this example, the mass of the object is 10kg.

Next, determine the velocity of the raising motion. In this case, the object needs to be raised at .25 m/s.

Next, determine the efficiency of the hoist. For this problem, the efficiency is 65% = .65.

Finally, calculate the motor power required using the formula above:

HMP = m*g*V / N

HMP = 10*9.81*.25 / .65

HMP = 37.73 Joules/second