Custom AFPM motor programs for compact high-torque electric drives where axial length, torque density, and thermal path matter more than commodity radial-flux availability.
| Metric | Typical Range | Why It Matters |
|---|---|---|
| Torque density target | 1.5 - 3.5 N·m/kg (Continuous) | AFPM value is strongest when torque per package depth is the main design constraint. |
| Axial package length | 35mm - 120mm active length | The axial length limit determines whether single-stator, dual-rotor, or custom housing work is viable. |
| Thermal path | Class H (180°C) or Class N (200°C) Stator | Continuous torque depends on how quickly copper and rotor heat can leave the compact package. |
The following physical and electrical parameters define the baseline envelope for this product family. Final values are governed by the specific winding and cooling configuration chosen during the RFQ process.
| Parameter | Planning Range | Notes |
|---|---|---|
| Torque (Continuous / Peak) | Project-specific after duty-cycle and cooling review | Peak limits depend on inverter phase current; continuous depends on thermal path. |
| Motor Constant (KV) | Winding dependent target set during electrical review | Adjusted via turn count to match target bus voltage and speed. |
| Electrical Interface | DC bus voltage, phase current, pole pairs, resistance, and inductance set per winding | Needed to match inverter limits, back EMF margin, and controller tuning. |
| Physical Dimensions | Project-specific OD, axial length, shaft, and flange envelope | Scalable by stator segmentation and single vs. dual-rotor topology. |
| Feedback / Brake Options | Hall sensors, encoder, resolver, temperature sensors, or holding brake review | Selected against control loop bandwidth, safety behavior, and integration space. |
| Cooling Methods | Natural Air, Forced Air, Liquid Jacket, Oil | Selection determines continuous power rating and environmental sealing. |
| Mass / Rotor Inertia | Project-specific after rotor disk, magnet carrier, shaft, and housing freeze | Required for acceleration estimates, balancing scope, and mechanical safety review. |
| IP Rating | Project-specific IP target after housing and seal review | Air-cooled and liquid or oil-cooled packages require different sealing validation. |
Use these checkpoints to turn a product-family discussion into a controlled sample and pilot-lot plan. The exact record set depends on the drawing, winding, rotor, cooling, and acceptance scope.
| Stage | Control Point | Buyer Evidence |
|---|---|---|
| RFQ freeze | Peak and continuous torque, target speed range, duty cycle, and overload window; Available axial length, outer diameter, shaft, flange, and mounting constraints | Revisioned RFQ, package envelope, torque-speed target, and CTQ list. |
| Manufacturing prep | Torque-speed curve, DC bus voltage, current limit, and cooling assumptions; Airgap control, rotor stiffness, magnet retention, and axial load management | Material route, winding target, rotor or magnet retention method, and fixture plan. |
| Sample validation | Torque density target, Axial package length | Resistance, hipot, no-load/back EMF, runout, balance, torque-speed, or thermal records as applicable. |
| Pilot handoff | Airgap tolerance stack causes torque loss or rub risk; Continuous torque is overestimated from peak torque | Lot traceability, change record, packaging approval, and outgoing inspection rhythm. |
Baseline parameter matrices, STEP files, and PDF datasheets may be shared after RFQ context is confirmed. Torque-speed maps and back EMF charts depend on the selected winding, cooling path, and validation scope.
No. AFPM is strongest when axial length and torque density dominate the design. Radial-flux motors may still be better for high-speed commodity platforms.
Yes, but the first review still needs package envelope, voltage, cooling assumption, and controller limits to avoid a misleading estimate.
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Please include application, peak/continuous torque, speed range, voltage/current limit, outer diameter, axial length, cooling method, quantity, and drawings or reference samples.
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Share torque-speed, package, cooling, and sample quantity in the first message.
