In This Article
Key Takeaways
- ◆Robot production announcements do not establish actual magnet orders or a named platform’s bill of materials.
- ◆Derive magnet quantity and duty from the intended actuator design.
- ◆Select the grade using the actual hot demagnetization curves, the magnetic circuit working point and the worst opposing field. A suffix is a nominal material class, not a guaranteed motor temperature limit or a chemical recipe. Mainrich’s sintered NdFeB range is N30 to N56, with no AH grades. The top grade depends on the temperature series: N56, N54M, N52H, N52SH, N50UH and N45EH. Grades up to N52SH can be made without a Chinese export licence, so we offer those first; UH and EH grades need a licence, applied for per order. Confirm the grade, suffix, geometry and production route for each drawing. This summary does not offer every combination; grades outside it in educational examples are not Mainrich supply offers.
- ◆Qualify samples from the intended manufacturing route before assigning volume.
- ◆Grade suffixes and F/N/D series labels do not establish composition or export clearance. Classify the actual item and transaction with the exporter, including the parties, end use and route. See the export-control guide.
From platform target to component demand
A public robot production target is not a shipped-unit total, a purchase order or a qualified magnet demand forecast. The earlier named-platform volume and magnet-content estimates have been removed. Build the requirement from the actual actuator bill of materials, spare allowance and programme schedule.
Start with the actuator
Identify motor topology, gear ratio, torque-speed duty, cooling and feedback system. Separate the torque-producing magnets from any encoder magnets. A named humanoid platform may use several actuator designs; do not infer one ring construction or grade for all joints.
Grade and geometry
Select the grade using the actual hot demagnetization curves, the magnetic circuit working point and the worst opposing field. A suffix is a nominal material class, not a guaranteed motor temperature limit or a chemical recipe. Mainrich’s sintered NdFeB range is N30 to N56, with no AH grades. The top grade depends on the temperature series: N56, N54M, N52H, N52SH, N50UH and N45EH.
Grades up to N52SH can be made without a Chinese export licence, so we offer those first; UH and EH grades need a licence, applied for per order. Confirm the grade, suffix, geometry and production route for each drawing. This summary does not offer every combination; grades outside it in educational examples are not Mainrich supply offers.
The radial-ring TDS, Rev A of 31 July 2026, states OD 20 to 75 mm, ID 15 to 68 mm, wall 2 to 7 mm and height 5 to 50 mm, with ±0.05 mm standard dimensional tolerance within the qualified route. These limits are not freely combinable. Confirm the drawing, grade, pole pattern and individual features before quotation.
The separate integrated-Halbach route states ±0.02 mm on critical features, subject to feature and drawing confirmation.
Material alternatives
The reported N45H magnetic comparison and the separate historical 50H Dy-reduction example have different scopes. See the GBD evidence and limitations. Finished-part savings require a quotation and qualification of the proposed route. Test the proposed alloy and processing route against the same hot magnetic and dimensional requirements.
Qualification records
Agree measurement positions, fixture conditions, traceability and change control. Check the current certificate for the actual manufacturing entity, address and activity. Agree PPAP level and required reports for the order; a network relationship does not certify every plant or assembly. Ask for evidence on the proposed route rather than a generic customer list.
Export and order planning
Grade suffixes and F/N/D series labels do not establish composition or export clearance. Classify the actual item and transaction with the exporter, including the parties, end use and route. See the export-control guide. Agree tooling, sample quantity, inspection and production milestones in the quotation.
Export release depends on any required authorization. No standard prototype quantity or fixed delivery interval is promised here.
Frequently Asked Questions
Which magnet grade does a named humanoid use?
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This article does not establish a platform bill of materials. Obtain the actual actuator specification or a dated primary technical disclosure.
What grade should my actuator use?
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Select the grade using the actual hot demagnetization curves, the magnetic circuit working point and the worst opposing field. A suffix is a nominal material class, not a guaranteed motor temperature limit or a chemical recipe. Mainrich’s sintered NdFeB range is N30 to N56, with no AH grades. The top grade depends on the temperature series: N56, N54M, N52H, N52SH, N50UH and N45EH. Grades up to N52SH can be made without a Chinese export licence, so we offer those first; UH and EH grades need a licence, applied for per order. Confirm the grade, suffix, geometry and production route for each drawing. This summary does not offer every combination; grades outside it in educational examples are not Mainrich supply offers.
Can I infer demand from a robot production target?
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Use confirmed programme requirements and the actual magnet count. An announced production target is not an order.
Does a Chinese manufacturer automatically have export clearance?
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Grade suffixes and F/N/D series labels do not establish composition or export clearance. Classify the actual item and transaction with the exporter, including the parties, end use and route. See the export-control guide.
What evidence should I request?
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Check the current certificate for the actual manufacturing entity, address and activity. Agree PPAP level and required reports for the order; a network relationship does not certify every plant or assembly.
Send the actuator drawing, duty cycle, planned quantities and qualification requirements for a supply review.
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