# ANSI/IEEE wound-rotor induction motor symbol

Canonical URL: https://eloragrid.ai/symbols/ansi-wound-rotor-induction-motor
Publisher: Elora Grid
Updated: 2026-10-14
Lookup label: M WR
Drawing use: SLD, Schematic
Reference families: IEEE / ANSI, Manufacturer

## Symbol convention

Convention: IEEE / ANSI
Form: Autodesk IEEE-oriented 3 Phase Motors functional form
Autodesk explicitly publishes this block under IEEE Symbol Preview. The counterpart is the matching functional concept; no equivalence of every detailed standard graphic is asserted.
Related representation: [Wound-rotor induction motor](https://eloragrid.ai/symbols/wound-rotor-induction-motor)

IEEE-oriented graphical reference for wound-rotor induction motor, with public vendor evidence and drawing-reading notes.

## What it represents

The wound-rotor motor form identifies a machine with a separately documented rotor circuit. The rotor connections and associated control or starting equipment remain distinct from the stator's three-phase supply.
This is a convention-specific lookup based on the publisher's IEEE-labelled preview. The geometry here is independently drawn to explain the connection or operation; it is not a certified reproduction of the standard graphic.

## How to read it

- Trace stator and rotor circuits independently.
- Read the selected library and the project legend together. A vendor block identifier is meaningful within its named library and is not a universal standard-symbol code.

## Information to show or reference

- Identify stator terminals
- Show rotor connections
- Reference starting/control circuit

## Important distinction

A wound-rotor machine differs electrically from a cage-rotor motor without accessible rotor terminals.

## Facts

- Convention evidence: Autodesk IEEE Symbol Preview — 3 Phase Motors
- Public vendor block name: HMO1M4 (Autodesk identifier; not an IEEE symbol number)
- Standards context: IEEE/ANSI 315-1975 covers diagram graphics. IEEE lists this edition as Inactive-Reserved.
- Artwork scope: Original functional illustration; exact standard glyph and compliance are not certified

## Public references

- [Autodesk IEEE Symbol Preview — 3 Phase Motors](https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-392101FD-A88C-4BAC-96CD-1C676094C262.htm) — Autodesk. Exact public IEEE-oriented category page verifying the component name and vendor block identifier.
- [IEEE/ANSI 315-1975: graphic symbols for electrical and electronics diagrams](https://standards.ieee.org/ieee/315/515/) — IEEE Standards Association. Graphic-symbol standards context and official status; not a source of reproduced artwork.

## Graphic scope

Independent original educational concept illustration by Elora Grid. Not a certified standards graphic or manufacturer footprint. Unitless; not to scale. Original artwork licence: https://creativecommons.org/licenses/by/4.0/. Publisher material is linked only.