Radially Oriented NdFeB Ring Magnets

Radially oriented NdFeB ring magnets provide advanced solutions to high performance motors. Using radially oriented ring magnets instead of arc/segment magnets, it can achieve more uniform magnetic flux density distribution, reduce motor noise, and make assembly/installation more convenient and reliable. Since radially oriented NdFeB ring magnets production requires custom tools, product development cost in the early stage is high (a set of tools for a prototype cost $1000-10000). They are mainly used in servo motors, EPS motors and magnetic couplings, etc.

single pole radially oriented ring magnet — single pole ring magnet

multi pole radially oriented ndfeb ring magnet — multi-pole ring magnet

Radially Oriented NdFeB Ring Magnets’ Magnetic Chracteristics

Magnet Grade	Max. Energy Product (BH)max		Residual Induction Br		Coercive Force Hcb		Intrinsic Coercivity Hcj		Max. Operating Temp.^[1]



	MGOe	kJ/m³	kGs	T	kOe	kA/m	kOe	kA/m	°C	°F
Sintered NdFeB Magnets
N30	28-31	223-247	10.8-11.3	1.08-1.13	≥10.0	≥796	≥12	≥955	80	176
N33	31-34	247-271	11.3-11.8	1.13-1.18	≥10.5	≥836	≥12	≥955	80	176
N35	33-36	263-286	11.7-12.2	1.17-1.22	≥10.8	≥859	≥12	≥955	80	176
N38	36-39	286-310	12.2-12.6	1.22-1.26	≥11.2	≥891	≥12	≥955	80	176
N40	38-41	302-326	12.4-12.9	1.24-1.29	≥11.4	≥907	≥12	≥955	80	176
N42	40-43	318-342	12.8-13.2	1.28-1.32	≥11.4	≥907	≥12	≥955	80	176
N45	43-46	342-366	13.2-13.7	1.32-1.37	≥11.6	≥923	≥12	≥955	80	176
N30M	28-31	223-247	10.8-11.3	1.08-1.13	≥10.0	≥796	≥14	≥1114	100	212
N33M	31-34	247-271	11.3-11.8	1.13-1.18	≥10.5	≥836	≥14	≥1114	100	212
N35M	33-36	263-286	11.7-12.2	1.17-1.22	≥10.9	≥867	≥14	≥1114	100	212
N38M	36-39	286-310	12.2-12.6	1.22-1.26	≥11.3	≥899	≥14	≥1114	100	212
N40M	38-41	302-326	12.4-12.9	1.24-1.29	≥11.6	≥923	≥14	≥1114	100	212
N42M	40-43	318-342	12.8-13.2	1.28-1.32	≥12.0	≥955	≥14	≥1114	100	212
N45M	43-46	342-366	13.2-13.7	1.32-1.37	≥12.5	≥995	≥14	≥1114	100	212
N30H	28-31	223-247	10.8-11.3	1.08-1.13	≥10.0	≥796	≥17	≥1353	120	248
N33H	31-34	247-271	11.3-11.8	1.13-1.18	≥10.5	≥836	≥17	≥1353	120	248
N35H	33-36	263-286	11.7-12.2	1.17-1.22	≥10.9	≥867	≥17	≥1353	120	248
N38H	36-39	286-310	12.2-12.6	1.22-1.26	≥11.3	≥899	≥17	≥1353	120	248
N40H	38-41	302-326	12.4-12.9	1.24-1.29	≥11.6	≥923	≥17	≥1353	120	248
N42H	40-43	318-342	12.8-13.2	1.28-1.32	≥12.0	≥955	≥17	≥1353	120	248
N30SH	28-31	223-247	10.8-11.3	1.08-1.13	≥10.0	≥796	≥20	≥1592	150	302
N33SH	31-34	247-271	11.3-11.8	1.13-1.18	≥10.5	≥836	≥20	≥1592	150	302
N35SH	33-36	263-286	11.7-12.2	1.17-1.22	≥10.9	≥867	≥20	≥1592	150	302
N38SH	36-39	286-310	12.2-12.6	1.22-1.26	≥11.3	≥899	≥20	≥1592	150	302
N40SH	38-41	302-326	12.4-12.9	1.24-1.29	≥11.6	≥923	≥20	≥1592	150	302
N42SH	40-43	318-342	12.8-13.2	1.28-1.32	≥12.0	≥955	≥20	≥1592	150	302
N30UH	28-31	223-247	10.8-11.3	1.08-1.13	≥10.2	≥812	≥25	≥1990	180	356
N33UH	31-34	247-271	11.3-11.8	1.13-1.18	≥10.7	≥851	≥25	≥1990	180	356
N35UH	33-36	263-286	11.7-12.2	1.17-1.22	≥11.1	≥883	≥25	≥1990	180	356
N38UH	36-39	286-310	12.2-12.6	1.22-1.26	≥11.5	≥915	≥25	≥1990	180	356
Bonded NdFeB Magnets
BN5	4.8-5.5	38-44	4.8-5.5	0.48-0.55	3.2-4.0	255-318	5-8	398-637	160	320
BN6	5.9-6.8	47-54	5.3-6.0	0.53-0.60	3.7-4.6	295-366	6-9	478-716	160	320
BN7	7.0-8.0	56-64	5.8-6.5	0.58-0.65	4.4-5.2	350-414	6-9	478-716	160	320
BN8	7.8-8.8	62-70	6.2-6.8	0.62-0.68	5.0-5.8	398-462	8-10	637-796	160	320
BN8H	7.5-8.5	60-68	6.0-6.6	0.60-0.66	4.8-5.8	382-462	10-13	796-1035	180	356
BN9	8.6-9.3	68-74	6.3-6.9	0.63-0.69	5.0-5.8	398-462	8-10	637-796	160	320
BN10	9.0-9.7	72-77	6.5-7.1	0.65-0.71	5.2-6.0	414-478	8-10	637-796	160	320
BN10H	8.8-9.5	70-76	6.2-6.8	0.62-0.68	5.4-6.0	430-478	11-14	875-1115	180	356
BN11	9.8-10.5	78-84	6.7-7.3	0.67-0.73	5.3-6.0	422-478	8-11	637-875	160	320
BN12	10.0-11.0	80-88	7.0-7.6	0.70-0.76	5.5-6.5	438-517	8-11	637-875	160	320

[1] Maximum operating temperature is strongly related to the load line/Pc (permeance coefficient) and operating environment of a NdFeB magnet.
* The values in this sheet are for reference only, radially oriented NdFeB ring magnets can be tailored as per customers’ specific requirements.