# ASM Scalar Control

Asynchronous machine V/f control

• Library:
• Simscape / Power Systems / Simscape Components / Control / ASM Control

## Description

The ASM Scalar Control block implements an asynchronous machine (ASM) scalar, that is V/f or V/Hz, control structure. The diagram shows the open-loop V/f control structure that the block implements.

### Equations

The ASM Scalar Control block computes the magnitude of the stator voltage based on the reference frequency, ${f}_{s}^{*}$, as:

`${V}_{s}^{*}=\left(\frac{{V}_{n}-{V}_{min}}{{f}_{n}-{f}_{min}}\right){f}_{s}^{*},$`
where:

• Vn is the rated voltage.

• Vmin is the minimum voltage.

• fn is the rated electrical frequency.

• fmin is the minimum frequency.

The voltage components in the stationary reference frame are:

`${V}_{\alpha }={V}_{s}^{*}\text{cos}\left(2\pi {f}_{s}^{*}t\right)$`
and
`${V}_{\beta }={V}_{s}^{*}\text{sin}\left(2\pi {f}_{s}^{*}t\right).$`

The block obtains Vabc from Vα and Vβ by using an inverse Clarke transformation.

## Ports

### Input

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Reference electrical frequency.

Example: Example

Data Types: `single` | `double`

### Output

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Reference phase voltages.

Example: Example

Data Types: `single` | `double`

## Parameters

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Nominal frequency.

Nominal voltage.

Lower bound for the voltage.

Time interval between samples. If the block is inside a triggered subsystem, inherit the sample time by setting this parameter to `-1`. If this block is in a continuous variable-step model, specify the sample time explicitly. For more information, see What Is Sample Time? (Simulink) and Specify Sample Time (Simulink).