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NdFeB Magnet Applied In Planar Rotor Assembly

NdFeB (neodymium-iron-boron) magnet is the third-generation permanent magnet, which has high magnetic energy product, good coercivity, and good temperature stability. Due to its excellent properties, the NdFeB magnet has been widely used in various fields, such as aerospace, automobile transmission systems, medical equipment, and so on. In this article, we will introduce the application of NdFeB magnet in the planar rotor assembly, analyze its advantages and disadvantages, discuss its performance grades and surface treatment requirements, and illustrate the advantages of Zhejiang Zhongke Magnetic Industry Co., Ltd. in manufacturing NdFeB magnets for Planar rotor assembly.

Application of NdFeB Magnet in Planar Rotor Assembly

Planar rotor assembly, also known as pancake motor, is a kind of electrical motor which has the rotor and stator arranged in a Planar configuration. It is widely used in aerospace, automobile transmission systems, and other areas where high power density and low volume are required. As an essential part of the Planar rotor assembly, the NdFeB magnet is mainly used in the rotor. The rotor consists of a hub, a magnetic core, and NdFeB magnets. The NdFeB magnets are arranged in a circle around the hub with their north and south poles alternating. When the stator generates a rotating magnetic field, the NdFeB magnets on the rotor are forced to rotate, driving the motor to work.

Advantages and Disadvantages of NdFeB Magnet in Planar Rotor Assembly

Advantages:

1. High magnetic energy product: NdFeB magnet has the highest magnetic energy product among all types of permanent magnets, which can reach up to 52 MGOe (mega-gauss-oersted).

2. Good coercivity: NdFeB magnet has a high intrinsic coercivity, which can maintain its magnetic properties even at high temperatures.

3. Good temperature stability: NdFeB magnet has good resistance to demagnetization at high temperatures, which makes it suitable for high-temperature environments.

4. High power density: NdFeB magnet has a high magnetic energy product and a small volume, which can provide high power per unit volume.

Disadvantages:

1. Poor corrosion resistance: NdFeB magnet is prone to corrosion in humid and acidic environments, which may cause its magnetic properties to deteriorate.

2. Fragile: The NdFeB magnet is brittle and easy to break under impact or pressure.

3. Sensitive to temperature changes: NdFeB magnet's magnetic properties may change with temperature, which requires careful temperature control during use.

Performance Grades and Surface Treatment Requirements of NdFeB Magnet

Performance Grades:

NdFeB magnet is classified into five grades based on its magnetic properties: N, M, H, SH, and UH. The higher the grade, the higher the magnetic energy product and the better the performance.

Characteristics Of Sintered NdFeB Magnet Under 23℃+/-2℃
Performance	Remanence Induction Intensity (Br)		Magnetic Coercive Force (Hcb)		Intrinsic Coercivity (Hcj)		Maximum Energy Product		Squareness Factors	Maximum Working Temperature
Performance	Remanence Induction Intensity (Br)		Magnetic Coercive Force (Hcb)		Intrinsic Coercivity (Hcj)		(BH)max		(Hk/Hcj)	Tw L/D = 0.7
Grade	Min		Min		Min		Range		Min
Grade	T	kGs	kA/m	kOe	kA/m	kOe	kA/m³	MGOe	%	°c
N28ZH	1.04	10.4	772	9.7	3184	40	207~239	26~30	90	250
N44AH	1.3	13	971	12.2	2786	35	326~358	41~45	90	230
N42AH	1.29	12.9	963	12.1	2786	35	318~350	40~44	90	230
N40AH	1.26	12.6	939	11.8	2786	35	302~334	38~42	90	230
N35AH	1.17	11.7	868	10.9	2786	35	263~295	33~37	90	230
N30AH	1.08	10.8	804	10.1	2786	35	223~255	28~32	90	230
N42TH	1.29	12.9	957	11.8	2627	33	318 ~ 342	43 ~ 46	90	220
N40TH	1.26	12.6	930	11.5	2627	33	302 ~ 326	40 ~ 43	90	220
N38TH	1.23	12.3	910	11.1	2627	33	287 ~ 310	38 ~ 41	90	220
N35TH	1.18	11.8	876	11	2786	35	263 ~ 287	36 ~ 39	90	220
N33TH	1.13	11.3	844	10.6	2786	35	247 ~ 270	33 ~ 36	90	220
N30TH	1.1	11	796	10	2786	35	223 ~ 247	31 ~ 33	90	220
N28TH	1.05	10.5	756	9.5	2786	35	207 ~ 230	25 ~ 29	90	220
N45EH	1.33	13.3	995	12.5	2308	29	342 ~ 366	45 ~ 49	90	200
N42EH	1.29	12.9	957	11.8	2308	29	318 ~ 342	43 ~ 46	90	200
N40EH	1.26	12.6	930	11.5	2388	30	302 ~ 326	40 ~ 43	90	200
N38EH	1.23	12.3	910	11.1	2388	30	287 ~ 310	38 ~ 41	90	200
N35EH	1.18	11.8	876	11	2388	30	263 ~ 287	36 ~ 39	90	200
N33EH	1.13	11.3	844	10.6	2388	30	247 ~ 270	33 ~ 36	90	200
N30EH	1.1	11	796	10	2388	30	223 ~ 247	31 ~ 33	90	200
N28EH	1.05	10.5	756	9.5	2388	30	207 ~ 230	25 ~ 29	90	200
N52UH	1.42	14.2	1018	12.8	1911	24	390 ~ 422	49 ~ 53	90	180
N50UH	1.39	13.9	1018	12.8	1911	24	374 ~ 406	47 ~ 51	90	180
N48UH	1.37	13.7	1018	12.8	1911	24	358 ~ 390	45 ~ 49	90	180
N45UH	1.33	13.3	995	12.5	1911	24	342 ~ 366	45 ~ 49	90	180
N42UH	1.29	12.9	957	11.8	1990	25	318 ~ 342	43 ~ 46	90	180
N40UH	1.26	12.6	930	11.5	1990	25	302 ~ 326	40 ~ 43	90	180
N38UH	1.23	12.3	910	11.1	1990	25	287 ~ 310	38 ~ 41	90	180
N35UH	1.18	11.8	876	11	1990	25	263 ~ 287	36 ~ 39	90	180
N33UH	1.13	11.3	844	10.6	1990	25	247 ~ 270	33 ~ 36	90	180
N30UH	1.1	11	796	10	1990	25	223 ~ 247	31 ~ 33	90	180
N28UH	1.05	10.5	756	9.5	1990	25	207 ~ 230	28 ~ 31	90	180
N52SH	1.42	14.2	1018	12.8	1512	19	390 ~ 422	49 ~ 53	90	150
N50SH	1.39	13.9	1018	12.8	1512	19	374 ~ 406	47 ~ 51	90	150
N48SH	1.37	13.7	1018	12.8	1512	19	358 ~ 390	45 ~ 49	90	150
N45SH	1.33	13.3	995	12.5	1592	20	342 ~ 366	45 ~ 49	90	150
N42SH	1.29	12.9	957	11.8	1592	20	318 ~ 342	43 ~ 46	90	150
N40SH	1.26	12.6	930	11.5	1592	20	302 ~ 326	40 ~ 43	90	150
N38SH	1.23	12.3	910	11.1	1592	20	287 ~ 310	38 ~ 41	90	150
N35SH	1.18	11.8	876	11	1592	20	263 ~ 287	36 ~ 39	90	150
N33SH	1.13	11.3	844	10.6	1592	20	247 ~ 270	33 ~ 36	90	150
N30SH	1.1	11	796	10	1592	20	223 ~ 247	31 ~ 33	90	150
N28SH	1.05	10.5	756	9.5	1592	20	207 ~ 230	28 ~ 31	95	150
N55H	1.45	14.5	1035	13	1274	16	406 ~ 438	53 ~ 56	95	120
N52H	1.42	14.2	1035	13	1274	16	390 ~ 422	49 ~ 53	95	120
N50H	1.39	13.9	1035	13	1274	16	374 ~ 406	47 ~ 51	95	120
N48H	1.37	13.7	1018	12.8	1274	16	358 ~ 390	45 ~ 49	95	120
N45H	1.33	13.3	995	12.5	1353	17	342 ~ 366	45 ~ 49	95	120
N42H	1.29	12.9	957	12	1353	17	318 ~ 342	43 ~ 46	95	120
N40H	1.26	12.6	930	117	1353	17	302 ~ 326	40 ~ 43	95	120
N38H	1.23	12.3	910	11.4	1353	17	287 ~ 310	38 ~ 41	95	120
N35H	1.18	11.8	876	11	1353	17	263 ~ 287	36 ~ 39	95	120
N33H	1.13	11.3	844	10.6	1353	17	247 ~ 270	33 ~ 36	95	120
N30H	1.1	11	796	10	1353	17	223 ~ 247	31 ~ 33	95	120
N28H	1.05	10.5	756	9.5	1353	17	207 ~ 230	28 ~ 31	95	120
N55M	1.45	14.5	995	12.5	1035	13	406 ~ 438	51 ~ 55	95	100
N52M	1.42	14.2	995	12.5	1035	13	390 ~ 422	49 ~ 53	95	100
N50M	1.39	13.9	1035	13	1114	14	374 ~ 406	47 ~ 51	95	100
N48M	1.37	13.7	1012	12.7	1114	14	358 ~ 390	45 ~ 49	95	100
N45M	1.33	13.3	971	12.2	1114	14	342 ~ 366	43 ~ 46	95	100
N42M	1.29	12.9	938	11.8	1114	14	318 ~ 342	40 ~ 43	95	100
N40M	1.26	12.6	910	11.4	1114	14	302 ~ 326	38 ~ 41	95	100
N38M	1.23	12.3	876	11	1114	14	287 ~ 310	36 ~ 39	95	100
N35M	1.18	11.8	860	10.8	1114	14	263 ~ 287	33 ~ 36	95	100
N33M	1.13	11.3	796	10	1114	14	247 ~ 270	31 ~ 33	95	100
N30M	1.1	11	796	10	1114	14	223 ~ 247	28 ~ 31	95	100
N28M	1.05	10.5	756	9.5	1114	14	207 ~ 230	26 ~ 29	95	100
N55	1.45	14.5	836	10.5	875	11	406 ~ 438	51 ~ 55	95	80
N54	1.45	14.5	836	10.5	876	11	406 ~ 438	51 ~ 55	95	80
N52	1.42	14.2	860	10.8	960	12	390 ~ 422	49 ~ 53	95	80
N50	1.39	13.9	860	10.8	960	12	374 ~ 406	47 ~ 51	95	80
N48	1.37	13.7	860	10.8	960	12	358 ~ 390	45 ~ 49	95	80
N45	1.33	13.3	836	10.5	960	12	342 ~ 366	43 ~ 46	95	80
N42	1.29	12.9	836	10.5	960	12	318 ~ 342	40 ~ 43	95	80
N40	1.26	12.6	836	10.5	960	12	302 ~ 326	38 ~ 41	95	80
N38	1.23	12.3	836	10.5	960	12	287 ~ 310	36 ~ 39	95	80
N35	1.18	11.8	836	10.5	960	12	263 ~ 287	33 ~ 36	95	80
N33	1.13	11.3	796	10	960	12	247 ~ 270	31 ~ 34	95	80

Surface Treatment Requirement

NdFeB magnet needs surface treatment to protect it from corrosion and improve its mechanical properties. The most common surface treatments are electroplating electroless plating, and organic coating. Electroplating can provide a dense and uniform coating to the magnet surface, while electroless plating can penetrate into the magnet surface to form a strong coating layer. The organic coating is a kind of paint or resin coating that can provide good protection against corrosion.

Type Of Coating		Thickness	Exterior	Corrosion Resistance					Remark
Type Of Coating		Thickness	Exterior	PCT	Salt Spray	Humidity and Temperature	Acid/Alkali	Oil	Remark
Zn(White Zn)	√	≥5μm	Blue white	——	★★	★★★	——	★
Zn(Color-plated Zn)	√	≥5μm	Iridescent	——	★★★	★★★★	——	★
Ni+Cu+Ni	√	≥15μm	Silver White	★★★	★★★★	★★★★★	★★★	★★★
Ni+Cu+Ni+Sn		≥15μm	Silver White	★★★★	★★★★	★★★★★	——	——	Excellent Eelding Performance
Chemic Ni	√	≥5μm	Silver White	★★★★	★★★★★	★★★★★	★★★	★★★
Epoxy	√	≥12μm	Black or Gray	★★★	★★★★★	★★★★★	★★★★★	★★★★	Poor Wear Resistance
Passivated	√	≤2μm	Black or Gray	——	——	★★★	——	★★★
Al		≥3μm	Silver Gray	★★★★	★★★	★★★★	——	★★★	High Binding Force
Al+Epoxy		≥15μm	Black or Gray	★★★★★	★★★★★	★★★★★	★★★★★	★★★★★	Poor Wear Resistance
Zn+Al		≥10μm	Silver White or Silver Gray	★★★★★	★★★★★	★★★★★	——	★★★★★
Everluber		≥5μm	Golden	★★★★	★★★★	★★★★★	★★★★★	★★★★
Teflon		≥5μm	Black	★★	★★★	★★★★★	★★★★★	★★★	Good Wear Resistance

Advantages of Zhejiang Zhongke Magnetic Industry Co., Ltd. in Manufacturing NdFeB Magnet for Planar Rotor Assembly

1. Advanced production technology: Zhejiang Zhongke Magnetic Industry Co., Ltd. has invested heavily in research and development of production technology, and has formed a complete production line from the production of raw materials to the finished product.

2. High-quality raw materials: Zhejiang Zhongke Magnetic Industry Co., Ltd. uses high-quality raw materials to ensure the consistency and stability of the magnetic properties of NdFeB magnets.

3. Strict quality control: Zhejiang Zhongke Magnetic Industry Co., Ltd. has a strict quality control system to ensure the quality of the products. From inspection of raw materials, production process control, and final inspection of the finished products, Zhejiang Zhongke Magnetic Industry Co., Ltd. has established a complete quality control system to ensure that each product meets customer requirements.

4. Professional technical team: Zhejiang Zhongke Magnetic Industry Co., Ltd. has a professional technical team that can provide customers with customized solutions for different applications.

NdFeB magnet has excellent magnetic properties and is widely used in Planar rotor assembly for aerospace, automobile transmission systems, and other applications. Although it has some disadvantages, such as poor corrosion resistance and brittleness, NdFeB magnet's advantages, such as high magnetic energy product and high power density, make it an ideal choice for many applications. To ensure the quality of the NdFeB magnet, it is necessary to pay attention to its performance grades and surface treatment requirements. Zhejiang Zhongke Magnetic Industry Co., Ltd. has advantages in manufacturing NdFeB magnets for Planar rotor assembly due to its advanced production technology, high-quality raw materials, strict quality control, and professional technical team. Warmly welcome customers from all over the world to send inquiries to us if related to magnets.