Wedge NdFeB Magnets

Description

Product Overview

Wedge NdFeB magnets, also known as wedge-shaped neodymium magnets, are high-performance rare earth permanent magnets designed for compact rotor slots, axial-flux motor segments and customized magnetic circuits. Their inclined or tapered geometry helps improve space utilization, rotor fit and magnetic field distribution while retaining the high energy density and coercivity of sintered NdFeB material.

Ningbo Vanguard Technologies supplies wedge magnets across the full grade family — from standard N-grade through M, H, SH, UH, and EH high-temperature series — enabling precise performance matching for each motor operating environment. All pieces undergo full magnetic testing, dimensional inspection, and salt-spray or HAST corrosion evaluation before shipment.

Whether you need a standard catalogue geometry or a fully custom wedge profile, Vanguard can provide sample shipment within 10–15 days and mass-production support for rotor assembly or bare-magnet supply.

Quick View

Wedge NdFeB Magnet Selection Snapshot

N35-N55

Available Grade Range

Standard, M, H, SH, UH and EH series for compact motor and generator designs.

80-200 °C

Temperature Class

Grade selection can be matched to rotor temperature, speed and demagnetization margin.

Angle Fit

Key Geometry Control

Arc length, wedge angle, thickness, bevel, chamfer and slot tolerance are customizable.

10-15 Days

Prototype Sample Lead Time

Fast sampling after drawing, grade, coating and magnetization direction are confirmed.

Temperature Grade Guide

N Series

80 °C

M Series

100 °C

H Series

120 °C

SH Series

150 °C

UH / EH

180-200 °C

Application Demand Focus

Axial Flux Motors

Slot fit

EV Drive Motors

Thermal margin

Generators

Coercivity

Robot Joints

Torque density

Medical Motors

Stability

1Drawing ReviewAngle, arc, thickness, tolerance

2Magnetic MatchBr, Hcj, BHmax, temperature

3Coating PlanNiCuNi, epoxy, Zn, passivation

4MagnetizationAxial, radial, segment direction

5InspectionFlux, polarity, size, coating

Industries Served

Key Applications

axial flux motors

By conforming to the disc‑type rotor structure, wedge magnets improve magnetic flux utilization, reduce cogging torque and torque ripple, and enhance overall motor efficiency and power density. Their segmented, wedge form also helps limit eddy current losses, improves thermal management, and supports precise assembly in high‑speed, high‑torque applications.

high efficiency motors

Custom wedge NdFeB magnets for permanent magnet synchronous motors (PMSM), synchronous motors and high-speed motors; the wedge shape fits tightly with the motor rotor core, optimizing the air gap magnetic field, reducing energy loss and improving motor efficiency and power density. They are widely used in new energy vehicle (BEV/PHEV) drive motors, industrial high-power motors and high-speed spindle motors.

Generators

High-coercivity wedge NdFeB magnets for wind power generators, hydroelectric generators and small portable generators; the wedge design adapts to the rotor structure of generators, withstands high centrifugal force during high-speed rotation, ensures stable magnetic performance and improves power generation efficiency. Especially suitable for direct-drive wind power generators that require compact structure and high magnetic energy.

Medical Equipment motors

Precision wedge NdFeB magnets for medical equipment motors (such as medical pumps, surgical robot motors); the compact wedge shape fits the small internal structure of medical equipment, with low magnetic leakage and stable magnetic performance, avoiding interference with medical detection signals and ensuring the safety and precision of medical equipment.

Robot Joint Motors

Compact high-torque wedge NdFeB magnets for robot joint motors, robotic arm drive motors and humanoid robot servo motors; the customized wedge shape fits the compact rotor structure of robot motors, with tight dimensional tolerance and optimized magnetic field distribution, ensuring precise torque output and smooth operation.

energy storage motors

Low-loss wedge NdFeB magnets for energy storage converter motors and energy management system motors; the wedge design adapts to the compact structure of energy storage equipment, optimizes magnetic field utilization, reduces energy loss, and improves the efficiency and stability of energy storage systems.

Magnetic Performance

Grade & Magnetic Properties

Standard grades for wedge NdFeB magnets. All values at 20 °C. Values are typical; exact grade selection is confirmed per application.

Grade	Remanence		Coercivity		Intrinsic Coercivity		Max. Energy Product		Temp. Coefficient (α)		Max. Working Temperature °C (L/D=0.7)
	Br		Hcb		Hcj		(BH)max		αBr (%/°C)	αHcj (%/°C)
	T	kGs	kA/m	kOe	kA/m	kOe	kJ/m³	MGOe	αBr (%/°C)	αHcj (%/°C)
N30	1.08–1.13	10.8–11.3	≥798	≥10.0	≥955	≥12	223–247	28–31	−0.12	−0.76	80
N33	1.13–1.17	11.3–11.7	≥836	≥10.5	≥955	≥12	247–271	31–34	−0.12	−0.76	80
N35	1.17–1.22	11.7–12.2	≥868	≥10.9	≥955	≥12	263–287	33–36	−0.12	−0.76	80
N38	1.22–1.25	12.2–12.5	≥899	≥11.3	≥955	≥12	287–310	36–39	−0.12	−0.76	80
N40	1.25–1.28	12.5–12.8	≥907	≥11.4	≥955	≥12	302–326	38–41	−0.12	−0.76	80
N42	1.28–1.32	12.8–13.2	≥915	≥11.5	≥955	≥12	318–342	40–43	−0.12	−0.76	80
N45	1.32–1.38	13.2–13.8	≥923	≥11.6	≥955	≥12	342–366	43–46	−0.12	−0.76	80
N48	1.38–1.42	13.8–14.2	≥923	≥11.6	≥955	≥12	366–390	46–49	−0.12	−0.76	80
N50	1.40–1.45	14.0–14.5	≥796	≥10.0	≥876	≥11	382–406	48–51	−0.12	−0.76	80
N52	1.43–1.48	14.3–14.8	≥796	≥10.0	≥876	≥11	398–422	50–53	−0.12	−0.76	80
N55	1.46–1.52	14.6–15.2	≥796	≥10.0	≥876	≥11	414–430	52–54	−0.12	−0.76	80
N35M	1.17–1.22	11.7–12.2	≥868	≥10.9	≥1114	≥14	263–287	33–36	−0.12	−0.68	100
N38M	1.22–1.25	12.2–12.5	≥899	≥11.3	≥1114	≥14	287–310	36–39	−0.12	−0.68	100
N40M	1.25–1.28	12.5–12.8	≥923	≥11.6	≥1114	≥14	302–326	38–41	−0.12	−0.68	100
N42M	1.28–1.32	12.8–13.2	≥955	≥12.0	≥1114	≥14	318–342	40–43	−0.12	−0.68	100
N45M	1.32–1.38	13.2–13.8	≥995	≥12.5	≥1114	≥14	342–366	43–46	−0.12	−0.68	100
N48M	1.37–1.43	13.7–14.3	≥1027	≥12.9	≥1114	≥14	366–390	46–49	−0.12	−0.68	100
N50M	1.40–1.45	14.0–14.5	≥1033	≥13.0	≥1114	≥14	382–406	48–51	−0.12	−0.68	100
N52M	1.43–1.48	14.3–14.8	≥1050	≥13.2	≥1114	≥14	398–422	50–53	−0.12	−0.68	100
N54M	1.45–1.50	14.5–15.0	≥1051	≥13.2	≥1114	≥14	414–438	52–55	−0.12	−0.68	100
N35H	1.17–1.22	11.7–12.2	≥868	≥10.9	≥1353	≥17	263–287	33–36	−0.12	−0.66	120
N38H	1.22–1.25	12.2–12.5	≥899	≥11.3	≥1353	≥17	287–310	36–39	−0.12	−0.66	120
N40H	1.25–1.28	12.5–12.8	≥923	≥11.6	≥1353	≥17	302–326	38–41	−0.12	−0.66	120
N42H	1.28–1.32	12.8–13.2	≥955	≥12.0	≥1353	≥17	318–342	40–43	−0.12	−0.66	120
N45H	1.32–1.36	13.2–13.6	≥963	≥12.1	≥1353	≥17	342–366	43–46	−0.12	−0.66	120
N48H	1.37–1.43	13.7–14.3	≥995	≥12.5	≥1353	≥17	366–390	46–49	−0.12	−0.66	120
N50H	1.40–1.45	14.0–14.5	≥1011	≥12.7	≥1353	≥17	382–406	48–51	−0.12	−0.66	120
N52H	1.43–1.48	14.3–14.8	≥1027	≥12.9	≥1353	≥17	398–422	50–53	−0.12	−0.66	120
N35SH	1.17–1.22	11.7–12.2	≥876	≥11.0	≥1592	≥20	263–287	33–36	−0.11	−0.56	150
N38SH	1.22–1.25	12.2–12.5	≥907	≥11.4	≥1592	≥20	287–310	36–39	−0.11	−0.56	150
N40SH	1.25–1.28	12.5–12.8	≥939	≥11.8	≥1592	≥20	302–326	38–41	−0.11	−0.56	150
N42SH	1.28–1.32	12.8–13.2	≥987	≥12.4	≥1592	≥20	318–342	40–43	−0.11	−0.56	150
N45SH	1.32–1.38	13.2–13.8	≥1003	≥12.6	≥1592	≥20	342–366	43–46	−0.11	−0.56	150
N48SH	1.37–1.43	13.7–14.3	≥1027	≥12.9	≥1592	≥20	366–390	46–49	−0.11	−0.56	150
N50SH	1.40–1.45	14.0–14.5	≥1003	≥12.6	≥1592	≥20	382–406	48–51	−0.11	−0.56	150
N30UH	1.08–1.13	10.8–11.3	≥812	≥10.2	≥1990	≥25	223–247	28–31	−0.10	−0.50	180
N33UH	1.13–1.17	11.3–11.7	≥852	≥10.7	≥1990	≥25	247–271	31–34	−0.10	−0.50	180
N35UH	1.17–1.22	11.7–12.2	≥860	≥10.8	≥1990	≥25	263–287	33–36	−0.10	−0.50	180
N38UH	1.22–1.25	12.2–12.5	≥876	≥11.0	≥1990	≥25	287–310	36–39	−0.10	−0.50	180
N40UH	1.25–1.28	12.5–12.8	≥899	≥11.3	≥1990	≥25	302–326	38–41	−0.10	−0.50	180
N42UH	1.28–1.32	12.8–13.2	≥899	≥11.3	≥1990	≥25	318–342	40–43	−0.10	−0.50	180
N45UH	1.32–1.36	13.2–13.6	≥908	≥11.4	≥1990	≥25	342–366	43–46	−0.10	−0.50	180
N48UH	1.37–1.43	13.7–14.3	≥908	≥11.4	≥1990	≥25	366–390	46–49	−0.10	−0.50	180
N28EH	1.04–1.08	10.4–10.8	≥780	≥9.8	≥2388	≥30	207–231	26–29	−0.10	−0.45	200
N30EH	1.08–1.13	10.8–11.3	≥812	≥10.2	≥2388	≥30	223–247	28–31	−0.10	−0.45	200
N33EH	1.13–1.17	11.3–11.7	≥836	≥10.5	≥2388	≥30	247–271	31–34	−0.10	−0.45	200
N35EH	1.17–1.22	11.7–12.2	≥876	≥11.0	≥2388	≥30	263–287	33–36	−0.10	−0.45	200
N38EH	1.22–1.25	12.2–12.5	≥899	≥11.3	≥2388	≥30	287–310	36–39	−0.10	−0.45	200
N40EH	1.25–1.28	12.5–12.8	≥899	≥11.3	≥2388	≥30	302–326	38–41	−0.10	−0.45	200
N42EH	1.28–1.32	12.8–13.2	≥899	≥11.3	≥2388	≥30	318–342	40–43	−0.10	−0.45	200
N45EH	1.32–1.36	13.2–13.6	≥899	≥11.3	≥2388	≥30	342–366	43–46	−0.10	−0.45	200
N28AH	1.04–1.08	10.4–10.8	≥787	≥9.9	≥2786	≥35	207–231	26–29	−0.10	−0.45	230
N30AH	1.08–1.13	10.8–11.3	≥819	≥10.3	≥2786	≥35	223–247	28–31	−0.10	−0.45	230
N33AH	1.13–1.17	11.3–11.7	≥843	≥10.6	≥2786	≥35	247–271	31–34	−0.10	−0.45	230
N35AH	1.17–1.22	11.7–12.2	≥876	≥11.0	≥2786	≥35	263–287	33–36	−0.10	−0.45	230
N38AH	1.22–1.25	12.2–12.5	≥899	≥11.3	≥2786	≥35	287–310	36–39	−0.10	−0.45	230

Typical Physical Properties (All Sintered NdFeB Grades)

Parameter	Unit	Reference Value	Parameter	Unit	Reference Value
Curie Temperature	°C	310 ~ 400	Thermal Conductivity	W/m·°C	8 ~ 10
Density	g/cm³	7.4 ~ 7.7	Young's Modulus	GPa	150 ~ 200
Vickers Hardness	HV	500 ~ 700	Electrical Resistivity (C∥)	μΩ·m	1.4 ~ 1.6
Recoil Permeability	—	1.02 ~ 1.08	Electrical Resistivity (C⊥)	μΩ·m	1.2 ~ 1.4
Compressive Strength	MPa	1000 ~ 1100	Coeff. of Thermal Expansion (C∥)	10⁻⁶/°C	4 ~ 9
Flexural Strength	MPa	150 ~ 400	Coeff. of Thermal Expansion (C⊥)	10⁻⁶/°C	−2 ~ 0

Magnetization Orientations Available

Surface Treatment

Coating & Plating Options

NdFeB is susceptible to oxidation without adequate surface protection. Vanguard specifies and verifies the following coating systems per IEC 60068 and ASTM B117 salt-spray standards.

Ni·Cu·Ni Triple Layer

Industry standard for clean, low-humidity environments. Bright silver finish.

Dimension Capability

Wedge magnets are defined by outer radius (R), inner radius (r), arc angle (θ), and axial length (L). Standard tolerance is ± 0.05 mm on all dimensions; tight-tolerance ± 0.03 mm available on request. Skewed and twisted configurations supported for cogging-torque reduction.

Dimension	Minimum	Maximum	Standard Tol.
Outer Radius (R)	5 mm	200 mm	± 0.05 mm
Inner Radius (r)	3 mm	195 mm	± 0.05 mm
Arc Angle (θ)	15°	180°	± 0.2°
Axial Length (L)	2 mm	150 mm	± 0.05 mm
Thickness (t = R–r)	2 mm	50 mm	± 0.05 mm

Engineering Selection

How to Specify Wedge NdFeB Magnets

Wedge magnets are usually designed around the magnetic circuit and rotor slot geometry. Vanguard reviews pole arc, wedge angle, inner and outer radius, axial length, magnetization direction, working temperature and assembly method before confirming the grade and coating system.

Magnetic circuit fit: The wedge angle, arc length and thickness distribution should match the rotor or stator geometry to improve air-gap flux density and reduce local saturation.

Thermal and demagnetization margin: SH, UH and EH grades are recommended for compact high-speed motors, axial-flux motors and generator rotors exposed to higher temperature or reverse-field stress.

Assembly reliability: Chamfer, bonding gap, coating thickness, polarity marking and rotor balance requirements should be defined early to reduce chipping and assembly variation.

Custom Capability

Available Custom Features

Item	Options	Typical Purpose
Geometry	Wedge segment, tapered block, skewed wedge, stepped wedge	Fit axial-flux rotors, compact motor slots and custom generator structures.
Magnetization	Through-thickness, radial, parallel, paired polarity, matched flux set	Optimize torque output, reduce ripple and support segmented rotor assembly.
Edge Treatment	Chamfer, radius, deburring, grinding mark control	Reduce chipping during bonding, handling and high-speed rotor assembly.
Surface Protection	NiCuNi, Zn, epoxy, NiCuNi + epoxy, phosphating	Improve corrosion resistance according to humidity, salt spray and temperature.

Manufacturing Process

From Powder to Finished Wedge Magnet

Production starts with alloy preparation, hydrogen decrepitation, jet milling and magnetic-field alignment. The sintered blanks are aged, sliced, profile-ground to the required wedge angle and radius, then coated, magnetized, inspected and packed according to the approved drawing.

For motor and generator projects, Vanguard can supply matched sets by pole, polarity marking, balanced packing sequence and inspection data suitable for rotor bonding or automated assembly.

Quality Assurance

Inspection & Validation

Magnetic testing: Br, Hcb, Hcj, (BH)max, surface flux, flux linkage, polarity and magnetization direction verification.

Dimensional control: Inner radius, outer radius, wedge angle, arc length, axial length, thickness, chamfer and appearance inspection.

Coating verification: Thickness, adhesion, salt spray, humidity resistance and thermal shock testing according to coating type.

Documentation: Material certificate, inspection report, RoHS/REACH declaration and lot traceability records are available for shipment release.

Request a Quote

Information Needed for Fast Quotation

To speed up engineering review, please send a 2D/3D drawing or list the key specifications below. If your project is still in design stage, Vanguard can help compare grade, coating and magnetization options before tooling.

Inner radius, outer radius, wedge angle, arc length, axial length and tolerance
Material grade or target Br/Hcj, plus maximum working temperature
Magnetization direction, polarity marking and required surface flux if available
Coating type, salt-spray requirement, adhesive process and operating environment
Sample quantity, annual volume, packing sequence and target delivery schedule

Support

Frequently Asked Questions

How do I choose between M, H, SH, and UH grades for my motor?

Grade selection depends on the maximum winding temperature your motor will experience. M-grade (≤100 °C) suits most industrial servo applications; H-grade (≤120 °C) is standard for EV auxiliary motors; SH (≤150 °C) and UH (≤180 °C) are specified for EV traction drives and high-ambient industrial use. We recommend providing your thermal simulation data so we can confirm the correct grade.

What is the minimum order quantity for custom wedge magnets?

For custom geometry, samples can be arranged from as few as 50–200 pieces. Mass-production MOQ is typically 1000–10000 pieces per specification, though this is flexible depending on magnet size and grade. Contact us to discuss your project volume.

Can you supply wedge magnets already assembled into a rotor?

Yes. Vanguard provides integrated rotor assembly services — including magnet bonding, balancing, and shaft press-fitting — as part of our Magnetic Systems product line. We can supply bare wedge magnets or complete rotor sub-assemblies depending on your manufacturing flow.

Do you provide material certifications and test reports?

Full material certificates (chemical composition, magnetic test data, coating thickness, salt-spray results) are provided with each shipment as standard. ROHS, REACH, and conflict-mineral declarations are available on request.

What is the lead time for wedge NdFeB magnets?

Prototype samples: 10–15 working days. Mass-production orders: 25–35 working days depending on grade, coating, and quantity. Rush sampling may be available — please inquire.

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Wedge NdFeB Magnets

Description

Wedge NdFeB Magnets

Wedge NdFeB Magnet Selection Snapshot

Key Applications

Grade & Magnetic Properties

Coating & Plating Options

Dimension Capability

How to Specify Wedge NdFeB Magnets

Available Custom Features

From Powder to Finished Wedge Magnet

Inspection & Validation

Information Needed for Fast Quotation

Frequently Asked Questions

Get in Touch with Us

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