# Rotational Power Sensor

Measure average or instantaneous rotational power

**Library:**Simscape / Driveline / Sensors

## Description

The Rotational Power Sensor block measures the rotational
power change between ports **R** and **C**. The
physical signal output can be an instantaneous or averaged value depending on what you
select for the **Measurement type** parameter.

When you set:

**Measurement type**to`Instantaneous power`

, the instantaneous power is the product of the current angular velocity and torque. Use this setting to analyze peak power transmission and identify heavily loaded components.**Measurement type**to`Average power over a specified period`

, the time-averaged power is the integral of the instantaneous power over one sample period, divided by that period. For simulation times smaller than the sample period, the average power is zero. The power output is constant for each sample period.**Measurement type**to`Average power over a vibration`

, the average vibration power is the integral of the power over one vibration period, divided by that period. The vibration period is the time between two consecutive crossings from negative to positive velocity values. If the vibration has a variable frequency, the averaging period can change. For simulation times smaller than the vibration period, the average power is zero. The power output is constant for each vibration period.**Measurement type**to`Average power over a revolution`

, the average revolution power is the integral of the instantaneous power over one revolution period, divided by that period. The revolution period is defined as the time between two consecutive crossings of zero angular position. If the revolution has a variable frequency, the averaging period can change. For simulation times smaller than the revolution period, the average power is zero. The power output is constant for each revolution period.

## Ports

### Physical Signal

### Conserving

## Parameters

## Model Examples

## Extended Capabilities

## See Also

**Introduced in R2013a**