Electric Motors
Axial-Flux Motor
An axial-flux motor routes magnetic flux along the shaft axis, creating a short, disc-shaped package.
EV Dictionary: Electric Motors
Browse electric vehicle terms and definitions related to Electric Motors. 21 terms
Electric Motors
Back Electromotive Force (Back-EMF)
Back-EMF is the voltage a spinning motor generates in opposition to the voltage driving it.
Electric Motors
Cogging Torque
Cogging torque is position-dependent torque caused by rotor magnets interacting with stator teeth and slots.
Electric Motors
Distributed, Concentrated, and Hairpin Windings
How distributed, concentrated, and hairpin winding terms describe different motor choices.
Electric Motors
Field Weakening
Field weakening limits effective motor flux at high speed so back-EMF stays within inverter voltage.
Electric Motors
Field-Oriented Control (FOC)
FOC separates motor-current components so controllers can regulate torque and magnetic flux precisely.
Electric Motors
In-Wheel Motor
An in-wheel motor places traction torque production at or inside a driven wheel.
Electric Motors
Inverter
An EV traction inverter converts battery DC into controlled motor current and manages regenerative power flow.
Electric Motors
Motor Air Gap
The motor air gap is the working clearance between the stator and rotor.
Electric Motors
Permanent-Magnet Demagnetization
Permanent-magnet demagnetization reduces rotor flux reversibly or irreversibly under heat and opposing fields.
Electric Motors
Permanent-Magnet Motor
A permanent-magnet motor uses magnets to provide part or all of its magnetic field.
Electric Motors
Permanent-Magnet Synchronous Motor (PMSM)
A PMSM uses rotor magnets that turn in step with the stator field to produce EV traction.
Electric Motors
Radial-Flux Motor
A radial-flux motor sends magnetic flux across a cylindrical air gap.
Electric Motors
Reluctance Motors (SynRM, SRM, and PM-Assisted)
Reluctance motors use directional magnetic opposition to produce rotor torque.
Electric Motors
Rotor
The rotor is the rotating electromagnetic part that transfers motor torque to the shaft.
Electric Motors
Rotor Cage and Slip in Induction Motors
How the rotor cage and speed difference called slip produce induction-motor torque.
Electric Motors
Rotor Saliency
Rotor saliency is a directional difference in magnetic reluctance within the rotor.
Electric Motors
Shaft Voltage, Common-Mode Voltage, and Bearing Currents
Common-mode switching can create shaft voltage and bearing currents that threaten motor-bearing life.
Electric Motors
Stator
The stator is the stationary active part that creates a motor's controlled magnetic field.
Electric Motors
Torque Ripple
Torque ripple is the periodic variation of a motor's instantaneous torque around its requested level.
Electric Motors
Wound-Rotor Synchronous Motor (WRSM/EESM)
A WRSM or EESM uses electrically excited rotor windings instead of permanent magnets in an EV traction motor.