# ANSI/IEEE Three-phase synchronous motor form Canonical URL: https://eloragrid.ai/symbols/ansi-three-phase-synchronous-motor Publisher: Elora Grid Updated: 2026-10-28 Lookup label: M 3PH SYNC Drawing use: SLD, Schematic Reference families: IEEE / ANSI, Manufacturer ## Symbol convention Convention: IEEE / ANSI Form: 3 Phase Synchronous AC Motor Autodesk IEEE Symbol Preview: 3 Phase Motors, block HMO1M17. Matching functional counterpart linked separately. Independently drawn educational geometry; not a certified IEEE glyph or database identifier. Related representation: [Three-phase synchronous motor](https://eloragrid.ai/symbols/three-phase-synchronous-motor) IEEE-library form of three-phase synchronous motor: a synchronous motor operates with a documented synchronous relationship to the electrical supply. ## In plain English ### What does ANSI/IEEE Three-phase synchronous motor form mean? This reference locates three-phase synchronous motor in Autodesk's IEEE-oriented 3 phase motors family. A synchronous motor operates with a documented synchronous relationship to the electrical supply. Its excitation arrangement and starting/control system require device-specific information. The public library uses HMO1M17 for its horizontal representation; this is a vendor block name, not an IEEE standards symbol number. ### A simple example Trace each winding, supply and accessible neutral through the complete machine or transformer connection diagram. Keep the phase arrangement, terminal labels and any clock notation attached to the device; neither the convention label nor this educational outline supplies its ratings. ### What the drawings help you do Identify any field or excitation supply separately from the main stator circuit. Synchronous operation is different from an induction motor's operating principle. The linked functional counterpart explains the same operating role in its own drawing context; agreement of every detailed convention mark is not asserted. ### This particular reference IEEE-library form of three-phase synchronous motor: a synchronous motor operates with a documented synchronous relationship to the electrical supply. Synchronous operation is different from an induction motor's operating principle. ### Terms - Winding: A coil of conductor inside an electrical machine or transformer. - Phase: One of the related AC waveforms in a power system. - Terminal: An identified point where a conductor connects. Concept diagram: Identify the device and form → Read the connections and state → Check the equipment reference A guide to reading this reference. The original symbol illustration and its drawing notes appear below; these boxes are not a wiring diagram. - [Autodesk IEEE Symbol Preview — 3 Phase Motors](https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-392101FD-A88C-4BAC-96CD-1C676094C262.htm) ## What it represents This reference locates three-phase synchronous motor in Autodesk's IEEE-oriented 3 phase motors family. A synchronous motor operates with a documented synchronous relationship to the electrical supply. Its excitation arrangement and starting/control system require device-specific information. The public library uses HMO1M17 for its horizontal representation; this is a vendor block name, not an IEEE standards symbol number. Trace each winding, supply and accessible neutral through the complete machine or transformer connection diagram. Keep the phase arrangement, terminal labels and any clock notation attached to the device; neither the convention label nor this educational outline supplies its ratings. Identify any field or excitation supply separately from the main stator circuit. Synchronous operation is different from an induction motor's operating principle. The linked functional counterpart explains the same operating role in its own drawing context; agreement of every detailed convention mark is not asserted. ## How to read it - Identify any field or excitation supply separately from the main stator circuit. - The preview is an original explanation of this function. Match the actual drawing convention to its legend and the selected equipment documentation. ## Information to show or reference - State motor rating - Show excitation reference - Link starting and protection circuits ## Important distinction Synchronous operation is different from an induction motor's operating principle. ## Facts - Convention evidence: Autodesk IEEE Symbol Preview: 3 Phase Motors; published form: 3 Phase Synchronous AC Motor. - Public vendor block: HMO1M17. Vendor library token, not an IEEE symbol number. - Drawing role: Rotating or linear load - Identifier status: The short label is a functional lookup label, not an assigned IEC or IEEE symbol number. Any separately listed Autodesk code is a verified vendor block name. - Artwork scope: Original educational geometry. Exact standard graphics, product ratings and terminal pinouts 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. Public IEEE-oriented 3 Phase Motors table explicitly lists HMO1M17 as 3 Phase Synchronous AC Motor. This supports the vendor convention context, not reproduction of the publisher graphic. ## 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.