PMT-NPV100X70 300 A Inductor Design Review

PMT-NPV100X70 300 A inductor engineering structure rendering — Engineering structure rendering — not a production photograph.

Status: design review / validation prototype. The 28-turn drawing contains calculations. A separate PMT-NPV100X70-300A pulse test report is published below, but its association with this drawing is unverified. Neither record establishes production release, customer approval or delivery history.

PMT-NPV100X70-300A: DPG-10 Pulse Test Report

PMC-TR-20260828-01 · Public revision P1 · Tested 2026-08-28 · n = 1

Measured with a DPG-10 pulse inductance (saturation) tester. The large-signal pulse method records incremental inductance Linc against instantaneous current: 100 V pulse, 320 A peak and 796 µs pulse width.

Test current	Measured Linc	Relative to 15 A
15 A	180 µH	100%
100 A	173 µH	96.1%
200 A	163 µH	90.6%
300 A	139 µH	77.2%
320 A	107 µH	59.4%

The 300 A test point is 139 µH, or 77.2% retention; the 320 A point is 107 µH. This single-sample report includes no DCR, temperature-rise or dielectric test. It does not establish a continuous 300 A rating. Pulse-method Linc is not directly equivalent to a small-signal LCR reading with DC bias.

Download PMT-NPV100X70-300A Test Report (CN/EN · 2 pages)

Relationship to the design drawing: the report identifies PMT-NPV100X70-300A but does not state a 28-turn construction or drawing revision. It is a separate model-family test record, not verification of the calculated PMT-NPV100X70-300A-28T-IND V1.0 values. Sample-to-drawing traceability, hot-condition DVP and production release remain open.

Published Design Scope

Part numberPMT-NPV100X70-300A-28T-IND

System configurationTwo independent 28-turn inductors are required per system

Core conceptPOCO NPV-40-I FeSi, zero functional-gap mating surfaces

Mechanical envelopeApproximately 100 × 70 × 160 mm per inductor concept

Operating review point16 kHz, single-circuit +300 A DC bias

Cooling inputForced-air cooling is required for the calculated copper-loss case

Calculated Values and Boundaries

Item	Published value	Evidence status
Zero-bias inductance, L0	Approximately 338 µH	Calculated; single-circuit DC-bias model
Inductance at +300 A, nominal	Approximately 158 µH	Calculated; not measured
Inductance at +300 A, worst case	At least 137 µH	Calculated with material tolerance and temperature derating
DCR at 100 °C	Approximately 4.4 mΩ	Calculated from MLT estimate; not measured
Copper loss	177 W at 200 Arms / 399 W at 300 A peak	Calculated; cooling and waveform dependent

Validation Gate Status — 28-Turn Design Drawing

Gate	Required evidence	Status
Input confirmation	Confirm 300 A circuit current, 16 kHz carrier and acceptance of measured NPV-40-I material curve	Open
Calculation / FEA	Predict loaded inductance and center-leg flux density over temperature	Calculation included
A-sample at 25 °C	Measure L at +300 A and record temperature rise or abnormal noise	Not provided
Hot-condition DVP	Verify hot loaded inductance, hi-pot and temperature rise	Not provided
Production control	Approved control plan including L0, DCR, L at +300 A and hot-condition data	Not released

What This Evidence Does Not Prove

The design drawing does not prove measured performance of the 28-turn construction, a 120 µH production rating, universal temperature rise, reliability lifetime, customer approval, delivery history or production release. Those conclusions require the named prototype, the approved test conditions and signed project records.

English Design-Review Drawing

Four-page A4 landscape PDF translated and formatted for international engineering review. The calculation, measurement and release boundaries are repeated on the document.

Download PMT-NPV100X70 PDF Send Project Parameters

Engineering contact: +86 13267069291 · [email protected]

PMT-NPV100X70 300 A DC-Bias Inductor Reference