layered permanent magnet

Overview

Layered Permanent magnet is a new construction of permanent magnet, which has been designed by motor engineer.

Ningbo Ankey magnet Co Ltd has manufactured ordinarly NdFeB Layered permanent magnets for 8 years, annual production capacity is 100000PCS .

Layered Permanent magnets are widely used in axial flux motor, EV/HEV traction motor, transverse flux motor, wind turbine generator, servo motor, torque motor, high speed motor etc.

NdFeB magnet is a strongest commercial permanent magnet which made from an alloy of neodymium ,iron, boron ,copper, aluminum etc . In virtue of their light weight , high magnetic strength ,the consistency of their magnetization and workability shape , NdFeB magnet have become a popular choice for a wide variety of applications, such as servo motor , gearless traction machines, permanent magnet synchronous motor , loudspeakers, permanent magnet synchronous generator , wheel motor etc .
After twenty years strive and equipped with advanced production machines and testing machines, Our NdFeB magnet has bellows properties:

Higher Magnetic performance
Our company has continuous mass production Of N52, N50M, 48H, 45SH, 40UH,40EH etc , But our technical engineer has not stop to develop new method for improved magnetic properties
Higher Uniformity
Through scientific technological regulations, we strictly manage the Br, Hcj, (BH)max and other magnetic property parameters of the magnets that are produced continuously, which ultimately ensure the high uniformity of our products’ performance.
Higher anti-corrosion
We use PCT to do the 480 hours (20 days) under the conditions of coating, 120centigrade’s high temperature, 2.2bar’s high pressure and 100%’s high humidity, the result is the surface of magnet without any yellow macula
Higher adhesive force
Glue magnet’s adhesive force are one of the key indexes to when choose the NdFeB magnet for motor and generator and electron market . We have introduce free surface energy > 60mN/M
Higher dimensional accuracy
Has established sophisticated production lines to meet the clients need for customization and capable of producing Higher dimensional accuracy. Best tolerance is +-/0.02MM and flatness is lower than 0.02MM .
Lower weight lost
We use HAST to do the 480 hours aging experiment under the conditions of non-coating, high temperature, high pressure and high humidity, the level of the loss weight can reach below 0.8 mg/cm2.
Lower magnetic attenuation
The magnet’s irreversible loss of flux is also very important thing need to consideration when your choose the magnet. we test the magnet At 120 X 5 hours situation of different batch magnet to repeat do on condition that high temperature to do demagnetize test .
Lower rare dysprosium used
In response to high prices and supply risks for dysprosium , our technical engineer has developed new magnet which used without any dysprosium for below N35-N52, N35M-N48M,N35H-N48H N33SH-N40SH magnet and used less dysprosium for 35EH .

magnetic Properties and demagnetized curve

Grade	Residual Indusction		Coercive Force		Intrinsic Coercive Force		Max Energy product		temp coefficient		Max working temperature
	（Br）		( HCb)		( HCj)		(BH)Max		20 – max WT		PC=2.17
	KGs	T	KOe	KA/m	KOe	KA/m	MGOe	KJ/m³	%/℃(Br)	%/℃(HCj)	℃
N35	11.7-12.2	1.17-1.22	≥10.9	≥868	≥12	≥955	33-36	263-287	0.12	0.76	80
N38	12.2-12.5	1.22-1.25	≥11.3	≥899	≥12	≥955	36-39	287-310	0.12	0.76	80
N40	12.5-12.8	1.25-1.28	≥11.4	≥907	≥12	≥955	38-41	302-326	0.12	0.76	80
N42	12.8-13.2	1.28-1.32	≥11.5	≥915	≥12	≥955	40-43	318-342	0.12	0.76	80
N45	13.2-13.8	1.32-1.38	≥11.6	≥923	≥12	≥955	43-46	342-366	0.12	0.76	80
N45-F	13.2-13.8	1.32-1.38	≥11.6	≥923	≥12	≥955	43-46	342-366	0.12	0.76	80
N48	13.8-14.2	1.38-1.42	≥11.6	≥923	≥12	≥955	46-49	366-390	0.12	0.76	80
N48-F	13.8-14.2	1.38-1.42	≥11.6	≥923	≥12	≥955	46-49	366-390	0.12	0.76	80
N50	14.0-14.5	1.40-1.45	≥11.4	≥907	≥12	≥955	48-51	382-406	0.12	0.80	80
N50-F	14.0-14.5	1.40-1.45	≥11.4	≥907	≥12	≥955	48-51	382-406	0.12	0.80	80
N52	14.3-14.8	1.43-1.48	≥11.4	≥907	≥12	≥955	50-53	398-422	0.12	0.80	80
N52-F	14.3-14.8	1.43-1.48	≥11.4	≥907	≥12	≥955	50-53	398-422	0.12	0.80	80
N54	14.5-15.1	1.45-1.51	≥11.4	≥868	≥12	≥955	52-55	414-438	0.12	0.80	80
N54-F	14.5-15.1	1.45-1.51	≥11.4	≥868	≥12	≥955	52-55	414-438	0.12	0.80	80
N33M	11.2-11.7	1.12-1.17	≥10.7	≥852	≥14	≥1114	31-34	247-271	0.115	0.70	100
N35M	11.7-12.2	1.17-1.22	≥10.9	≥868	≥14	≥1114	33-36	263-287	0.115	0.70	100
N38M	12.2-12.5	1.22-1.25	≥11.3	≥899	≥14	≥1114	36-39	287-310	0.115	0.70	100
N40M	12.5-12.8	1.25-1.28	≥11.6	≥923	≥14	≥1114	38-41	302-326	0.115	0.70	100
N42M	12.8-13.2	1.28-1.32	≥12.0	≥955	≥14	≥1114	40-43	318-342	0.115	0.70	100
N42M-F	12.8-13.2	1.28-1.32	≥12.0	≥955	≥14	≥1114	40-43	318-342	0.115	0.70	100
N45M	13.2-13.8	1.32-1.38	≥12.5	≥995	≥14	≥1114	43-46	342-366	0.115	0.70	100
N45M-F	13.2-13.8	1.32-1.38	≥12.5	≥995	≥14	≥1114	43-46	342-366	0.115	0.70	100
N48M	13.8-14.2	1.38-1.42	≥12.9	≥1027	≥14	≥1114	46-49	366-390	0.115	0.70	100
N48M-F	13.8-14.2	1.38-1.42	≥12.9	≥1027	≥14	≥1114	46-49	366-390	0.115	0.70	100
N50M	14.0-14.5	1.40-1.45	≥13.0	≥1033	≥14	≥1114	48-51	382-406	0.115	0.70	100
N50M-F	14.0-14.4	1.40-1.44	≥13.0	≥1033	≥14	≥1114	48-51	382-406	0.115	0.70	100
N52M	14.3-14.8	1.43-1.48	≥13.2	≥1050	≥14	≥1114	50-53	398-422	0.115	0.70	100
N52M-F	14.3-14.8	1.43-1.48	≥13.2	≥1050	≥14	≥1114	50-53	398-422	0.115	0.70	100
N30H	10.8-11.2	1.08-1.12	≥10.3	≥820	≥17	≥1353	28-31	223-247	-0.115	-0.620	120
N33H	11.2-11.7	1.12-1.17	≥10.7	≥852	≥17	≥1353	31-34	247-271	-0.115	-0.620	120
N35H	11.7-12.2	1.17-1.22	≥10.9	≥868	≥17	≥1353	33-36	263-287	-0.115	-0.620	120
N35H-F	11.7-12.2	1.17-1.22	≥10.9	≥868	≥17	≥1353	33-36	263-287	-0.115	-0.620	120
N38H	12.2-12.5	1.22-1.25	≥11.3	≥899	≥17	≥1353	36-39	287-310	-0.115	-0.620	120
N38H-F	12.2-12.5	1.22-1.25	≥11.3	≥899	≥17	≥1353	36-39	287-310	-0.115	-0.620	120
N40H	12.5-12.8	1.25-1.28	≥11.6	≥923	≥17	≥1353	38-41	302-326	-0.115	-0.620	120
N40H-F	12.5-12.8	1.25-1.28	≥11.6	≥923	≥17	≥1353	38-41	302-326	-0.115	-0.620	120
N42H	12.8-13.2	1.28-1.32	≥12.0	≥955	≥17	≥1353	40-43	318-342	-0.115	-0.620	120
N42H-F	12.8-13.2	1.28-1.32	≥12.0	≥955	≥17	≥1353	40-43	318-342	-0.115	-0.620	120
N45H	13.2-13.8	1.32-1.38	≥12.5	≥995	≥17	≥1353	43-46	342-366	-0.115	-0.620	120
N45H-F	13.2-13.8	1.32-1.38	≥12.5	≥995	≥17	≥1353	43-46	342-366	-0.115	-0.620	120
N48H	13.8-14.2	1.38-1.42	≥12.9	≥1027	≥17	≥1353	46-49	366-390	-0.115	-0.620	120
N48H-F	13.8-14.2	1.38-1.42	≥12.9	≥1027	≥17	≥1353	46-49	366-390	-0.115	-0.620	120
N50H	14.0-14.5	1.40-1.45	≥13.0	≥1033	≥16.5	≥1314	48-51	382-406	-0.115	-0.660	120
N50H-G	14.0-14.4	1.40-1.44	≥13.0	≥1033	≥16.5	≥1314	48-51	382-406	-0.115	-0.660	120
N52H-G	14.3-14.8	1.43-1.48	≥13.2	≥1050	≥16.5	≥1314	50-53	398-422	-0.115	-0.660	120
N30SH	10.8-11.2	1.08-1.12	≥10.3	≥820	≥20	≥1592	28-31	223-247	-0.115	-0.550	150
N33SH	11.2-11.7	1.12-1.17	≥10.7	≥852	≥20	≥1592	31-34	247-271	-0.115	-0.550	150
N35SH	11.7-12.2	1.17-1.22	≥11.0	≥876	≥20	≥1592	33-36	263-287	-0.115	-0.550	150
N35SH-F	11.7-12.2	1.17-1.22	≥11.0	≥876	≥20	≥1592	33-36	263-287	-0.115	-0.550	150
N38SH	12.2-12.5	1.22-1.25	≥11.4	≥907	≥20	≥1592	36-39	287-310	-0.115	-0.550	150
N38SH-F	12.2-12.5	1.22-1.25	≥11.4	≥907	≥20	≥1592	36-39	287-310	-0.115	-0.550	150
N40SH	12.5-12.8	1.25-1.28	≥11.9	≥947	≥20	≥1592	38-41	302-326	-0.115	-0.550	150
N40SH-F	12.5-12.8	1.25-1.28	≥11.9	≥947	≥20	≥1592	38-41	302-326	-0.115	-0.550	150
N42SH	12.8-13.2	1.28-1.32	≥12.4	≥987	≥20	≥1592	40-43	318-342	-0.115	-0.550	150
N42SH-F	12.8-13.2	1.28-1.32	≥12.4	≥987	≥20	≥1592	40-43	318-342	-0.115	-0.550	150
N45SH	13.2-13.8	1.32-1.38	≥12.6	≥1003	≥20	≥1592	43-46	342-366	-0.115	-0.550	150
N45SH-G	13.2-13.8	1.32-1.38	≥12.6	≥1003	≥20	≥1592	43-46	342-366	-0.115	-0.550	150
N48SH	13.8-14.2	1.38-1.42	≥12.9	≥1027	≥20	≥1592	46-49	366-390	-0.115	-0.550	150
N48SH-G	13.8-14.2	1.38-1.42	≥12.9	≥1027	≥20	≥1592	46-49	366-390	-0.115	-0.550	150
N50SH-G	14.0-14.5	1.40-1.45	≥13.0	≥1033	≥20	≥1592	48-51	382-406	-0.115	-0.550	150
N30UH	10.8-11.2	1.08-1.12	≥10.3	≥820	≥25	≥1990	28-31	223-247	-0.110	-0.465	180
N30UH-G	10.8-11.2	1.08-1.12	≥10.3	≥820	≥25	≥1990	28-31	223-247	-0.110	-0.465	180
N33UH	11.2-11.7	1.12-1.17	≥10.7	≥852	≥25	≥1990	31-34	247-271	-0.110	-0.465	180
N33UH-G	11.2-11.7	1.12-1.17	≥10.7	≥852	≥25	≥1990	31-34	247-271	-0.110	-0.465	180
N35UH	11.7-12.2	1.17-1.22	≥11.0	≥876	≥25	≥1990	33-36	263-287	-0.110	-0.465	180
N35UH-G	11.7-12.2	1.17-1.22	≥11.0	≥876	≥25	≥1990	33-36	263-287	-0.110	-0.465	180
N38UH	12.2-12.5	1.22-1.25	≥11.4	≥907	≥25	≥1990	36-39	287-310	-0.110	-0.465	180
N38UH-G	12.2-12.5	1.22-1.25	≥11.4	≥907	≥25	≥1990	36-39	287-310	-0.110	-0.465	180
N40UH	12.5-12.8	1.25-1.28	≥11.9	≥947	≥25	≥1990	38-41	302-326	-0.110	-0.465	180
N40UH-G	12.5-12.8	1.25-1.28	≥11.9	≥947	≥25	≥1990	38-41	302-326	-0.110	-0.465	180
N42UH	12.8-13.2	1.28-1.32	≥12.4	≥987	≥25	≥1990	40-43	318-342	-0.110	-0.465	180
N42UH-G	12.8-13.2	1.28-1.32	≥12.4	≥987	≥25	≥1990	40-43	318-342	-0.110	-0.465	180
N45UH	13.2-13.8	1.32-1.38	≥12.6	≥1003	≥25	≥1990	43-46	342-366	-0.110	-0.465	180
N45UH-G	13.2-13.8	1.32-1.38	≥12.6	≥1003	≥25	≥1990	43-46	342-366	-0.110	-0.465	180
N48UH-G	13.8-14.2	1.38-1.42	≥12.9	≥1027	≥25	≥1990	46-49	366-390	-0.110	-0.465	180
N30EH	10.8-11.3	1.08-1.13	≥10.2	≥812	≥30	≥2388	28-31	223-247	-0.105	-0.420	200
N30EH-G	10.8-11.3	1.08-1.13	≥10.2	≥812	≥30	≥2388	28-31	223-247	-0.105	-0.420	200
N33EH	11.3-11.7	1.13-1.17	≥10.5	≥836	≥30	≥2388	31-34	247-271	-0.105	-0.420	200
N33EH-G	11.3-11.7	1.13-1.17	≥10.5	≥836	≥30	≥2388	31-34	247-271	-0.105	-0.420	200
N35EH	11.7-12.2	1.17-1.22	≥11.0	≥876	≥30	≥2388	33-36	263-287	-0.105	-0.420	200
N35EH-G	11.7-12.2	1.17-1.22	≥11.0	≥876	≥30	≥2388	33-36	263-287	-0.105	-0.420	200
N38EH	12.2-12.5	1.22-1.25	≥11.4	≥907	≥30	≥2388	36-39	287-310	-0.105	-0.420	200
N38EH-G	12.2-12.5	1.22-1.25	≥11.4	≥907	≥30	≥2388	36-39	287-310	-0.105	-0.420	200
N40EH	12.5-12.8	1.25-1.28	≥11.9	≥947	≥30	≥2388	38-41	302-326	-0.105	-0.420	200
N40EH-G	12.5-12.8	1.25-1.28	≥11.9	≥947	≥30	≥2388	38-41	302-326	-0.105	-0.420	200
N42EH-G	12.8-13.2	1.28-1.32	≥12.4	≥987	≥30	≥2388	40-43	318-342	-0.105	-0.420	200
Note: The above –mentioned data of magnetic properties and physical properties are given at 20°C±2°C. Test sample is polished dia 10 X 7 without chamfering and plating. max WT = Max work Temperature
Note: The max working temperature of magnet is changeable due to length-diameter ration, coating thickness and working environment factors, Normal It is tested the inevitable loss of magnetic force is less than 5% .
Note: G Seriers (N54H-G / N52SH-G) is produced by Grain boundary diffusion process technology, It only suits for finished magnet＇s magnetization direction is less than 6MM.
Note: F Seriers (N54H-F / N52SH-F) is produced by without heavy rare earth process technology .

manufacturing capability

manufacturable size

Shape	Schematic Diagram	Range	Economic Dimensions
Block		L ≤ 250 MM W≤ 250 MM H≤ 60 MM L/W ≤ 20 L/H ≤ 20	L ≤ 100 MM W≤ 50 MM H≤ 50 MM L/W ≤ 5 L/H ≤ 5
Disc		D ≤ 250 MM H≤ 50 MM D/H ≤ 20	D ≤ 150 MM H≤ 40 MM D/H ≤ 15
Ring		OD ≤ 250 MM ID ≥ 0.8 MM (OD-ID) / 2 ≥ 1.0MM ID/OD ≤ 0.8 H≤ 50 MM	OD ≤ 150 MM ID ≥ 2 MM (OD-ID) / 2 ≥ 2.0MM ID/OD ≤ 0.6 H≤ 40 MM
Bread		L ≤ 250 MM W≤ 150 MM H≤ 60 MM L/H ≤ 20	L ≤ 100 MM W≤ 50 MM H≤ 40 MM L/H ≤ 10
Arc		L ≤ 250 MM W≤ 250 MM 1.5 MM ≥ H ≤ 60 MM T≤ 50 MM L/H ≤ 10 A ≤ 180	L ≤ 200 MM W≤ 200 MM 1.5 MM ≥ H ≤ 60 MM T≤ 40 MM L/H ≤ 5 A ≤ 90
sector		W ≤ 200 MM H≤ 80 MM T≤ 50 MM W/H ≤ 5 W/T ≤ 30	W ≤ 100 MM H≤ 80 MM T≤ 50 MM W/H ≤ 3 W/T ≤ 30
trapezium		W1 ≤ 180 MM W2 ≤ 150 MM H≤ 150 MM T≤ 50 MM W1/T ≤ 30 W2/T ≤ 20	W1 ≤ 100 MM W2 ≤ 80 MM H≤ 60 MM T≤ 40 MM W1/T ≤ 20 W2/T ≤ 10

manufacturable precision

Sharp	Disk, Ring, Block, Arc, ball, sphere, Heteromorphism Unit: mm
Dimension range	OD	ID	L	W	T	Planar	Parallel	Perpendicular	Columnar	Concentricity
≤5	±0.03	±0.05	±0.04	±0.04	±0.04	0.02	0.03	0.03	0.02	0.04
5＜and≤10	±0.04	±0.04	±0.04	±0.04	±0.03	0.02	0.04	0.05	0.02	0.05
10＜and≤20	±0.05	±0.05	±0.05	±0.05	±0.04	0.03	0.05	0.08	0.03	0.10
20＜and≤30	±0.05	±0.06	±0.06	±0.06	±0.05	0.04	0.05	0.10	0.03	0.15
30＜and≤40	±0.06	±0.07	±0.06	±0.06	±0.05	0.05	0.08	0.20	0.04	0.20
40＜and≤50	±0.06	±0.07	±0.06	±0.06	±0.05	0.05	0.08	0.20	0.04	0.20
50＜and≤60	±0.08	±0.08	±0.10	±0.10	±0.08	0.05	0.10	0.25	0.05	0.20
60＜and≤100	±0.10	±0.10	±0.10	±0.10	±0.10	0.06	0.10	0.30	0.06	0.20
100＜and≤250	±0.20	±0.10	±0.10	±0.10	±0.10	0.09	0.10	0.30	0.06	0.20

manufacturable Coating

Coating materials	Thickness of Coating layer	Physical properties	Max work Temperature	PCT	SST
Passvation	0-02μm	Colorless or light gray layer	—	—	—
Zn	8-15μm	Layer color: blue and white,. Coating layer is compact, stable and homogeneous.	≤160℃	—	＞24hr
Colur ZN	10-15μm		≤160℃	—	＞24hr
Ni＋Sn	10-30μm		≤160℃	＞48hr	＞96hr
Ni	15-30μm	Homogeneous and Light yellow layer.	≤200℃	＞24hr	＞48hr
Double Ni( Ni+Cu+Ni)	20-30μm		≤200℃	＞48hr	＞96hr
Electroless NI	20-30μm		≤200℃	＞48hr	＞96hr
Al Spraying	6-20μm	dark silver, silver white layer with certain luster.	≤200℃	＞48hr	＞288hr
IVD Al	10-30μm	dark silver, silver white layer with certain luster.	≤400℃	＞48hr	＞288hr
Epoxy	10-20μm	black, gray layer with certain luster.	≤200℃	＞48hr	＞96hr
Ni+Cu+epoxy	15-30μm		≤200℃	＞72hr	＞96hr
Zn+expory	15-25μm		≤200℃	＞72Hr	＞96hr
Zintek	10-30μm	black, gray layer with certain luster.	≤200℃	＞200Hr	＞800hr
Zintek+epoxy	20-30μm	black, gray layer with certain luster.	≤200℃	＞200Hr	＞1500hr