---
name: "clarkeinv"
section: "9"
platform: "linux"
package: "linuxcnc-uspace"
version: "1:2.9.4-2+deb13u1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/clarkeinv"
---

# clarkeinv(9)

Inverse Clarke transform

## NAME

clarkeinv - Inverse Clarke transform

## SYNOPSIS

**loadrt clarkeinv \[count=*N*\|names=*name1*\[,*name2...*\]\]**

## DESCRIPTION

The inverse Clarke transform can be used rotate a  vector quantity and then translate it from Cartesian coordinate system to a three phase system (three components 120 degrees apart).

## FUNCTIONS

- **clarkeinv.***N* (requires a floating-point thread)

  ## PINS

- **clarkeinv.*N*.x float in**

  - **clarkeinv.*N*.y float in**

  cartesian components of input

- **clarkeinv.*N*.h float in**

  homopolar component of input (usually zero)

- **clarkeinv.*N*.theta float in**

  rotation angle: 0.00 to 1.00 = 0 to 360 degrees

- **clarkeinv.*N*.a float out**

  - **clarkeinv.*N*.b float out**

  - **clarkeinv.*N*.c float out**

  three phase output vector

## SEE ALSO

[**clarke2**(9)](/clarke2/9.md) and [**clarke3**(9)](/clarke3/9.md) for the forward transform.

## AUTHOR

John Kasunich

## LICENSE

GPL