# ANSI/IEEE Three-phase induction motor with series excitation form Canonical URL: https://eloragrid.ai/symbols/ansi-three-phase-induction-motor-with-series-excitation Publisher: Elora Grid Updated: 2026-10-28 Lookup label: HMO1M3 Drawing use: SLD, Schematic Reference families: IEEE / ANSI, Manufacturer ## Symbol convention Convention: IEEE / ANSI Form: 3 Phase Asynchro Motor with Series Excitation Autodesk IEEE Symbol Preview: 3 Phase Motors, block HMO1M3. Matching functional counterpart linked separately. Independently drawn educational geometry; not a certified IEEE glyph or database identifier. Related representation: [Three-phase induction motor with series excitation](https://eloragrid.ai/symbols/iec-three-phase-induction-motor-with-series-excitation) IEEE-library form of three-phase induction motor with series excitation: this representation identifies the publisher's asynchronous motor form with series excitation. ## In plain English ### What does ANSI/IEEE Three-phase induction motor with series excitation form mean? This reference locates three-phase induction motor with series excitation in Autodesk's IEEE-oriented 3 phase motors family. This representation identifies the publisher's asynchronous motor form with series excitation. The public library uses HMO1M3 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 Document stator, excitation and any associated control connections separately. The reference form does not identify a conventional squirrel-cage motor without an excitation circuit. Document stator, excitation and any associated control connections separately. The reference form does not identify a conventional squirrel-cage motor without an excitation circuit. 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 induction motor with series excitation: this representation identifies the publisher's asynchronous motor form with series excitation. The reference form does not identify a conventional squirrel-cage motor without an excitation circuit. ### 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 induction motor with series excitation in Autodesk's IEEE-oriented 3 phase motors family. This representation identifies the publisher's asynchronous motor form with series excitation. The public library uses HMO1M3 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. Document stator, excitation and any associated control connections separately. The reference form does not identify a conventional squirrel-cage motor without an excitation circuit. Document stator, excitation and any associated control connections separately. The reference form does not identify a conventional squirrel-cage motor without an excitation circuit. 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 - Document stator, excitation and any associated control connections separately. - The reference form does not identify a conventional squirrel-cage motor without an excitation circuit. ## Information to show or reference - Identify the associated device, circuit or diagram boundary. - Document stator, excitation and any associated control connections separately. - Cross-reference the equipment data, terminal mapping or operating-state legend needed to interpret the form. ## Important distinction The reference form does not identify a conventional squirrel-cage motor without an excitation circuit. ## Facts - Convention evidence: Autodesk IEEE Symbol Preview: 3 Phase Motors; published form: 3 Phase Asynchro Motor with Series Excitation. - Public vendor block: HMO1M3. Vendor library token, not an IEEE symbol number. - Information added: Document stator, excitation and any associated control connections separately. - Preview: Independent educational concept; consult the publisher and applicable standard for the exact graphic - 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 HMO1M3 as 3 Phase Asynchro Motor with Series Excitation. 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.