# ANSI/IEEE Series-excited DC motor form Canonical URL: https://eloragrid.ai/symbols/ansi-series-excited-dc-motor Publisher: Elora Grid Updated: 2026-10-28 Lookup label: M DC SERIES Drawing use: SLD, Schematic Reference families: IEEE / ANSI, Manufacturer ## Symbol convention Convention: IEEE / ANSI Form: DC Motor - Series Excitation Autodesk IEEE Symbol Preview: DC Motors, block HMO1M7. Matching functional counterpart linked separately. Independently drawn educational geometry; not a certified IEEE glyph or database identifier. Related representation: [Series-excited DC motor](https://eloragrid.ai/symbols/series-excited-dc-motor) IEEE-library form of series-excited dc motor: a series-excited DC motor connects its documented field winding in series with the armature circuit. ## In plain English ### What does ANSI/IEEE Series-excited DC motor form mean? This reference locates series-excited dc motor in Autodesk's IEEE-oriented dc motors family. A series-excited DC motor connects its documented field winding in series with the armature circuit. Both winding and armature terminals need to remain identifiable in expanded schematics. The public library uses HMO1M7 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 Follow the field current through the armature path. A series field and a shunt field have different circuit connections. 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 series-excited dc motor: a series-excited DC motor connects its documented field winding in series with the armature circuit. A series field and a shunt field have different circuit connections. ### Terms - DC: Direct current: electricity flowing in one direction. - Winding: A coil of conductor inside an electrical machine or transformer. - Phase: One of the related AC waveforms in a power system. 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 — DC Motors](https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-6A65D995-18BC-4A3C-A34E-C6BB276E8410.htm) ## What it represents This reference locates series-excited dc motor in Autodesk's IEEE-oriented dc motors family. A series-excited DC motor connects its documented field winding in series with the armature circuit. Both winding and armature terminals need to remain identifiable in expanded schematics. The public library uses HMO1M7 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. Follow the field current through the armature path. A series field and a shunt field have different circuit connections. 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 - Follow the field current through the armature path. - 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 - Show series field connection - Identify armature terminals - Reference starting/control arrangement ## Important distinction A series field and a shunt field have different circuit connections. ## Facts - Convention evidence: Autodesk IEEE Symbol Preview: DC Motors; published form: DC Motor - Series Excitation. - Public vendor block: HMO1M7. 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 — DC Motors](https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-6A65D995-18BC-4A3C-A34E-C6BB276E8410.htm) — Autodesk. Public IEEE-oriented DC Motors table explicitly lists HMO1M7 as DC Motor - 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.