# Asynchronous Machine Measurement

Per-unit measurement from asynchronous machine

Machines

## Description

The Asynchronous Machine Measurement block outputs a per-unit measurement associated with a connected Asynchronous Machine Squirrel Cage or Asynchronous Machine Wound Rotor block. The input of the Asynchronous Machine Measurement block connects to the `pu` output port of the asynchronous machine block.

You set the Output parameter to a per-unit measurement associated with the asynchronous machine. Based on the value you select, the Asynchronous Machine Measurement block:

• Directly outputs the value of an element in the input signal vector

• Calculates the per-unit measurement by using values of elements in the input signal vector in mathematical expressions

The Asynchronous Machine Measurement block outputs a per-unit measurement from the asynchronous machine according to the output value expressions in the table. For example, when you set Output to ```Stator d-axis voltage```, the block directly outputs the value of the `pu_vds` element in the input signal vector. However, when you set Output to `Slip`, the block calculates the slip value by subtracting the value of the `pu_velocity` element from 1.

Output Parameter SettingOutput Value Expression

Electrical torque

pu_torque

Rotor velocity

pu_velocity

Stator d-axis voltage

pu_vds

Stator q-axis voltage

pu_vqs

Stator zero-sequence voltage

pu_v0s

Stator d-axis current

pu_ids

Stator q-axis current

pu_iqs

Stator zero-sequence current

pu_i0s

Slip

1-pu_velocity

Apparent power

$\sqrt{pu_P{t}^{2}+pu_Q{t}^{2}}$

Real power

pu_Pt = (pu_vds*pu_ids) + (pu_vqs*pu_iqs) + 2(pu_v0s*pu_i0s)

Reactive power

pu_Qt = (pu_vqs*pu_ids) – (pu_vds*pu_iqs)

Terminal voltage

$\sqrt{pu_vd{s}^{2}+pu_vq{s}^{2}}$

Terminal current

$\sqrt{pu_id{s}^{2}+pu_iq{s}^{2}}$

power_factor_angle = atan2(pu_Qt, pu_Pt)

Power factor

cos(power_factor_angle)

## Parameters

Output

Per-unit measurement from asynchronous machine. The default value is `Electrical torque`.

## Ports

The block has the following ports:

`pu`

Physical signal vector port associated with per-unit measurements from a connected asynchronous machine. The vector elements are:

• pu_torque

• pu_velocity

• pu_vds

• pu_vqs

• pu_v0s

• pu_ids

• pu_iqs

• pu_i0s

`o`

Per-unit measurement output port.