Grade Selection
Balance remanence, intrinsic coercivity, motor operating point and cost. Chinese Y grades and American C grades are listed below.
Arc Ferrite Magnets
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Ningbo Vanguard Technologies Co., Ltd
Cost-effective ceramic magnet segments for fan motors, pump motors, appliances and industrial drives.
Vanguard supports grade selection, curved geometry review, magnetization planning, sample development and production supply. Bare segments, matched pole sets and rotor assembly projects can be reviewed from your drawing and motor requirements.
Request a Drawing Review
Selection Snapshot
Balance remanence, intrinsic coercivity, motor operating point and cost. Chinese Y grades and American C grades are listed below.
Specify outer and inner radii, arc angle, axial length, thickness, chamfers and inspection datums.
Review pole count, pole arc, air gap, back iron and magnetization direction as one magnetic circuit.
Request bare magnets, polarity-sorted pole sets or rotor assembly support. Schedule and quantity are confirmed after review.
Geometry & Magnetization
The curved shape does not define the magnetic direction. State outer radius, inner radius, included angle, axial length and edge treatment on the controlled drawing.
Provide a polarity sketch, pole sequence and quantity per rotor. Material orientation and magnetizing-fixture feasibility are confirmed before release.
Engineering Selection
Select from the working point at the actual magnet temperature and reverse field. Higher remanence alone does not define the best grade.
Evaluate pole coverage, magnet thickness, rotor radius and back iron together for torque, cogging, noise and efficiency.
Define final dimensions, bonding clearance, rotor seating and retention. Ferrite is brittle, so avoid assembly loads that concentrate stress at edges.
Ferrite remanence generally decreases as temperature rises, while coercivity behaves differently from rare-earth magnets. Validate cold-start and hot-running conditions for the chosen grade.
Magnetic Performance
Reference values at 20 °C from the existing Vanguard ferrite grade table. The approved material specification and agreed inspection criteria govern each order.
| Grade | Standard | Br mT | Br kG | Hcb kA/m | Hcb kOe | Hcj kA/m | Hcj kOe | BHmax kJ/m³ | BHmax MGOe |
|---|---|---|---|---|---|---|---|---|---|
| Y8T | Chinese | 200-235 | 2.0-2.35 | 125-160 | 1.57-2.01 | 210-280 | 2.64-3.52 | 6.5-9.5 | 0.8-1.2 |
| Y10T | Chinese | 200-235 | 2.0-2.35 | 128-160 | 1.61-2.01 | 210-280 | 2.64-3.52 | 6.4-9.6 | 0.8-1.2 |
| Y20 | Chinese | 320-380 | 3.2-3.8 | 135-190 | 1.70-2.39 | 140-195 | 1.76-2.45 | 18.0-22.0 | 2.3-2.8 |
| Y22H | Chinese | 310-360 | 3.1-3.6 | 220-250 | 2.76-3.14 | 280-320 | 3.52-4.02 | 20.0-24.0 | 2.5-3.0 |
| Y23 | Chinese | 320-370 | 3.2-3.7 | 170-190 | 2.14-2.39 | 190-230 | 2.39-2.89 | 20.0-25.5 | 2.5-3.2 |
| Y25 | Chinese | 360-400 | 3.6-4.0 | 135-170 | 1.70-2.14 | 140-200 | 1.76-2.51 | 22.5-28.0 | 2.8-3.5 |
| Y26H | Chinese | 360-390 | 3.6-3.9 | 220-250 | 2.76-3.14 | 225-255 | 2.83-3.20 | 23.0-28.0 | 2.9-3.5 |
| Y26H-1 | Chinese | 360-390 | 3.6-3.9 | 200-250 | 2.51-3.14 | 225-255 | 2.83-3.20 | 23.0-28.0 | 2.9-3.5 |
| Y26H-2 | Chinese | 360-380 | 3.6-3.8 | 263-288 | 3.30-3.62 | 318-350 | 4.00-4.40 | 24.0-28.0 | 3.0-3.5 |
| Y27H | Chinese | 370-400 | 3.7-4.0 | 205-250 | 2.58-3.14 | 210-255 | 2.64-3.20 | 25.0-29.0 | 3.1-3.6 |
| Y28 | Chinese | 370-400 | 3.7-4.0 | 175-210 | 2.20-2.64 | 180-220 | 2.26-2.76 | 26.0-30.0 | 3.3-3.8 |
| Y28H-1 | Chinese | 380-400 | 3.8-4.0 | 240-260 | 3.02-3.27 | 250-280 | 3.14-3.52 | 27.0-30.0 | 3.4-3.8 |
| Y28H-2 | Chinese | 360-380 | 3.3-3.8 | 271-295 | 3.41-3.71 | 382-405 | 4.80-5.09 | 26.0-30.0 | 3.3-3.8 |
| Y30 | Chinese | 370-400 | 3.7-4.0 | 175-210 | 2.20-2.64 | 180-220 | 2.26-2.76 | 26.0-30.0 | 3.3-3.8 |
| Y30BH | Chinese | 380-390 | 3.8-3.9 | 223-235 | 2.80-2.95 | 231-245 | 2.90-3.08 | 27.0-30.0 | 3.4-3.8 |
| Y30H-1 | Chinese | 380-400 | 3.8-4.0 | 230-275 | 2.89-3.46 | 235-290 | 2.95-3.64 | 27.0-32.0 | 3.4-4.0 |
| Y30H-2 | Chinese | 395-415 | 3.95-4.15 | 275-300 | 3.46-3.77 | 310-335 | 3.90-4.21 | 27.0-32.5 | 3.4-4.1 |
| Y32 | Chinese | 400-420 | 4.0-4.2 | 160-190 | 2.01-2.39 | 165-195 | 2.07-2.45 | 30.0-33.5 | 3.8-4.2 |
| Y32H-1 | Chinese | 400-420 | 4.0-4.2 | 190-230 | 2.39-2.89 | 230-250 | 2.89-3.14 | 31.5-35.0 | 4.0-4.4 |
| Y32H-2 | Chinese | 400-440 | 4.0-4.4 | 224-240 | 2.81-3.02 | 230-250 | 2.89-3.14 | 31.0-34.0 | 3.9-4.3 |
| Y33 | Chinese | 410-430 | 4.1-4.3 | 220-250 | 2.76-3.14 | 225-255 | 2.83-3.20 | 31.5-35.0 | 4.0-4.4 |
| Y33H | Chinese | 410-430 | 4.1-4.3 | 250-270 | 3.14-3.39 | 250-275 | 3.14-3.46 | 31.5-35.0 | 4.0-4.4 |
| Y34 | Chinese | 420-440 | 4.2-4.4 | 200-230 | 2.51-2.89 | 205-235 | 2.58-2.95 | 32.5-36.0 | 4.1-4.5 |
| Y35 | Chinese | 430-450 | 4.3-4.5 | 215-239 | 2.70-3.00 | 217-241 | 2.73-3.03 | 33.1-38.2 | 4.2-4.8 |
| Y36 | Chinese | 430-450 | 4.3-4.5 | 247-271 | 3.10-3.41 | 250-274 | 3.14-3.44 | 35.1-38.3 | 4.4-4.8 |
| Y38 | Chinese | 440-460 | 4.4-4.6 | 285-305 | 3.58-3.83 | 294-310 | 3.69-3.90 | 36.6-40.6 | 4.6-5.1 |
| Y40 | Chinese | 440-460 | 4.4-4.6 | 330-354 | 4.15-4.45 | 340-360 | 4.27-4.52 | 37.5-41.8 | 4.7-5.3 |
| C1 | American | 230 | 2.3 | 148 | 1.86 | 258 | 3.5 | 8.36 | 1.05 |
| C5 | American | 380 | 3.8 | 191 | 2.4 | 199 | 2.5 | 27 | 3.4 |
| C7 | American | 340 | 3.4 | 258 | 3.23 | 318 | 4.0 | 21.9 | 2.75 |
| C8 / C8A | American | 385 | 3.85 | 235 | 2.95 | 242 | 3.05 | 27.8 | 3.5 |
| C8B | American | 420 | 4.2 | 232 | 2.913 | 236 | 2.96 | 32.8 | 4.12 |
| C9 | American | 380 | 3.8 | 280 | 3.516 | 320 | 4.01 | 26.4 | 3.32 |
| C10 | American | 400 | 4.0 | 280 | 3.52 | 284 | 3.57 | 30.4 | 3.82 |
| C11 | American | 430 | 4.3 | 200 | 2.512 | 204 | 2.56 | 34.4 | 4.32 |
| C12 | American | 400 | 4.0 | 290 | 3.65 | 318 | 4.0 | 32 | 4.0 |
Grade selection: Compare values only under equivalent test conditions. Final performance also depends on material orientation, segment geometry, magnetization, motor air gap and the measurement method.
Material Reference
General reference values for sintered ferrite materials. These values describe the material family and are not part-specific acceptance limits unless separately agreed.
| Parameter | Unit | Typical Value |
|---|---|---|
| Density / ρ | g/cm³ | 4.9-5.1 |
| Vickers Hardness / HV | - | 400-700 |
| Compression Strength | N/mm² | 680-720 |
| Coefficient of Thermal Expansion / α | 10-6/°C | C⊥: 10; C∥: 15 |
| Electrical Resistivity / ρ | mΩ·cm | 1 × 1010 |
| Thermal Conductivity / k | W/(cm·°C) | 0.029 |
| Tensile Strength / σ | Pa | 34 × 106 |
| Modulus of Elasticity / λ | Pa | 1.8 × 1011 |
| Flexural Strength / σ | Pa | 62 × 106 |
| Compression Strength | Pa | 895 × 106 |
| Poisson's Ratio / ν | - | 0.28 |
Orientation notation: C∥ and C⊥ indicate directions parallel and perpendicular to the material orientation axis. Confirm test methods when a physical property is used as a design or acceptance requirement.
Drawing Definition
The ranges below are catalogue references from the existing page. Minimum and maximum values cannot be combined independently; tooling, pressing direction, radius ratio, angle, thickness and axial length are reviewed together.
| Dimension | Reference Minimum | Reference Maximum | Drawing Requirement |
|---|---|---|---|
| Outer Radius (R) | 5 mm | 200 mm | Define datum and inspection method |
| Inner Radius (r) | 3 mm | 195 mm | Coordinate with R and thickness |
| Arc Angle | 15° | 180° | Define angle and edge condition |
| Axial Length (L) | 5 mm | 300 mm | Review pressing and grinding route |
| Thickness (R-r) | 2 mm | 25 mm | Confirm whether radii are concentric |
Final tolerances are quoted by feature after geometry, tooling, grinding stock and inspection access are reviewed. Do not infer a universal tight tolerance from a catalogue range.
Application Fit
Cost-effective segments for household, HVAC and light-industrial air-moving equipment where stable production and corrosion resistance are important.
Suitable for many enclosed pump motor designs. The magnet itself resists corrosion, but the complete rotor, adhesive and steel components still need environmental review.
Support repeat-volume motors for appliances, actuators and general machinery with drawing-controlled pole sets and magnetic sorting.
Review pole geometry, temperature, reverse field, rotor retention and balance according to the actual machine duty.
Production Support
Align powder preparation, orientation, pressing and sintering with the approved grade and geometry.
Inspect radii, angle, axial length, thickness, chamfers and agreed chip limits using defined datums.
Confirm polarity, grade properties, surface flux or rotor-set matching under an agreed measurement setup.
Define polarity marking, pole-set packing, lot identification, inspection reports and protective handling.
Project Workflow
Technical Questions
No. Remanence, intrinsic coercivity, motor geometry, temperature, demagnetizing field and cost must be considered together.
No. Arc describes the shape. Material orientation, magnetization direction and polarity must be specified separately with a drawing or sketch.
Ferrite generally has good corrosion resistance and is commonly supplied uncoated. A coating or marking may still be considered for identification, cleanliness, bonding or project-specific exposure.
Yes, matched pole sets and rotor assembly projects can be reviewed. Include rotor geometry, adhesive or retention, pole sequence, balance and inspection requirements.
Define probe type, location, air distance, fixture, temperature and polarity. A flux value without a controlled measurement setup is not reliably comparable.
Geometry, tooling, grade availability, magnetizing fixtures, inspection scope and quantity determine the quotation. Send sample demand and forecast volume for review.
Send your drawing and motor operating conditions for an arc ferrite magnet review.
