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Neodymium Block Magnet

Description:

Applications of NdFeB Block-Magnetic separators, linear actuators, microphone assemblies, servo motors, DC motors (automotive starters), computer rigid disc drives, printers and speakers, magnetic assemblies, magnetic tumblers, magnetic machines, science projects and many more unimaginable applications.

The use of neodymium iron boron (NdFeB) magnets in electric vehicle (EV) hub motors has become quite common. These highly powerful and efficient rare earth magnets are used in the wheel hub motors of electric vehicles to provide efficient propulsion. Amongst the diverse shapes of NdFeB magnets, square or rectangular magnets are preferred for wheel hub motors.

Square NdFeB magnets are commonly used in electric vehicle wheel hub motors due to their high magnetic strength and durability. These magnets are required to provide strong magnetic force to generate the required torque and enable efficient power transfer to the wheels. Square-shaped magnets offer a higher magnetic flux density than round or cylindrical-shaped ones, resulting in greater torque and better acceleration of the motor.

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Size Chart
Performance Parameters
Surface Coating
Magnetization Direction

Product Name	Size Type	Machinable Dimensions (Can Be Classified According To Size), With Tolerances
Neodymium Block Magnet	L/W	1、0.2mm<L/W≤5.00mm，Tolerances±0.02mm
		2、5.0mm<L/W≤20.0mm，Tolerances±0.03mm
		3、20.0mm<L/W≤85.0mm，Tolerances±0.04mm
	H	1、0.2mm<H≤3.00mm，Tolerances±0.02mm
		2、3.00mm<H≤10.0mm，Tolerances±0.03mm
		3、H>10.0mm，Tolerances±0.05mm
	Flatness	1、L×W≤25.0mm²，Flatness±0.02mm
		2、25.0mm²<L×W≤400.0mm²，Flatness±0.03mm
		3、400.0mm²<L×W<5600.0mm²，Flatness±0.05mm
	Parallelism	1、0.20mm<L/W≤5.00mm，Parallelism±0.02mm
		2、5.00mm<L/W≤30.0mm，Parallelism±0.03mm
		3、30.0mm<L/W≤75.0mm，Parallelism±0.05mm
		4、L/W>75.0mm，Parallelism±0.10mm
	C Angle
		C≥0.1mm






	R Angle
		R≥0.1mm

Advantages of Square NdFeB Magnets

1. High Magnetic Strength:

Square NdFeB magnets are known for their high magnetic strength, which makes them an excellent choice for EV wheel hub motors. They have a maximum energy product (BHmax) that is five times greater than that of ferrite magnets. This high magnetic strength enables better torque and acceleration of the motor, thereby improving the overall performance of the EV.

2. Efficient Power Transfer:
The use of square NdFeB magnets also improves the efficiency of the EV motor since they generate less eddy current than other types of magnets. This is because the square shape allows for a more even distribution of the magnetic field, leading to less power loss due to eddy currents.

3. Compact Size:
Square NdFeB magnets are also preferred for EV wheel hub motors because of their compact size. This enables them to be easily integrated into the wheel hub without increasing the size or weight of the motor. In addition, this also allows for a more compact design of the EV, which is highly desirable for urban driving conditions.

Disadvantages of Square NdFeB Magnets

1. High Cost:

Despite their numerous advantages, one major disadvantage of square NdFeB magnets is their high cost compared to other types of magnets. This high cost is due to the complex manufacturing process and the high price of rare earth materials.

2. Low Operating Temperature:
Square NdFeB magnets have a relatively low operating temperature range of around 80°C. This means that they need to be treated with care during operation to avoid overheating and demagnetization, which can cause reduced performance and even motor failure.

Zhejiang Zhongke Magnetic Industry Co., Ltd., a leading manufacturer of NdFeB magnets in China, excels in manufacturing square-shaped NdFeB magnets due to its advanced technology and strict quality control. Advantages of Zhejiang Zhongke Magnetic Industry Co., Ltd. in Manufacturing Square NdFeB Magnets:

1. Advanced Technology:
Zhejiang Zhongke Magnetic Industry Co., Ltd. has invested in advanced technology for the manufacture of NdFeB magnets, which ensures the precision and consistency of the magnets. This technology improves the efficiency, magnetic strength, and durability of the magnets, making them ideal for use in EV wheel hub motors.

2. Strict Quality Control:
Zhejiang Zhongke Magnetic Industry Co., Ltd. has a sophisticated quality control system that ensures that each batch of magnets meets all the required technical specifications. This system includes the use of advanced testing equipment and conducting rigorous quality tests at every stage of production.

3. Customized Magnets:
Zhejiang Zhongke Magnetic Industry Co., Ltd. can also provide customized magnets for specific applications. This allows customers to get the exact magnet specifications that they require, ensuring top performance and quality.

Square NdFeB magnets are key components in electric vehicle wheel hub motors. While they offer numerous advantages such as high magnetic strength, efficient power transfer, and compact size, they also have some disadvantages like high cost and low operating temperature. Zhejiang Zhongke Magnetic Industry Co., Ltd. excels in manufacturing square NdFeB magnets due to its advanced technology and strict quality control, making them an ideal choice for use in EV wheel hub motors.

Sintered NdFeB Magnet Inspection Standards
GRADE Performance grade	Residual Magnetic Induction Intensity (Br)		Magnetic Coercivity (HCB)		Intrinsic Coercivity (HCJ)		Maximum Magnetic Energy Product (BH)max		Maximum Operating Temperature Tw L/D = 0.7
	Minimum Value		Minimum Value		Minimum Value		Range		Maximum Operating Temperature Tw L/D = 0.7
	T	kGs	kA/m	kOe	kA/m	kOe	kA/m³	MGOe	°c
N28ZH	1.04	10.4	772	9.7	3184	40	207 ~ 230	26 ~ 29	250
N44AH	1.3	13	971	12.2	2786	35	326~358	41~45	230
N42AH	1.29	12.9	963	12.1	2786	35	318 ~ 342	40 ~ 43	230
N40AH	1.26	12.6	939	11.8	2786	35	302 ~ 326	38 ~ 41	230
N35AH	1.17	11.7	868	10.9	2786	35	263 ~ 287	33 ~ 36	230
N30AH	1.08	10.8	804	10.1	2786	35	223 ~ 247	28 ~ 31	230
N42TH	1.29	12.9	957	11.8	2627	33	318 ~ 342	40 ~ 43	220
N40TH	1.26	12.6	930	11.5	2627	33	302 ~ 326	38 ~ 41	220
N38TH	1.23	12.3	910	11.1	2627	33	287 ~ 310	36 ~ 39	220
N35TH	1.18	11.8	876	11	2786	35	263 ~ 287	33 ~ 36	220
N33TH	1.13	11.3	844	10.6	2786	35	247 ~ 270	31 ~ 33	220
N30TH	1.1	11	796	10	2786	35	223 ~ 247	28 ~ 31	220
N28TH	1.05	10.5	756	9.5	2786	35	207 ~ 230	26 ~ 29	220
N45EH	1.33	13.3	995	12.5	2308	29	342 ~ 366	43 ~ 46	200
N42EH	1.29	12.9	957	11.8	2308	29	318 ~ 342	40 ~ 43	200
N40EH	1.26	12.6	930	11.5	2388	30	302 ~ 326	38 ~ 41	200
N38EH	1.23	12.3	910	11.1	2388	30	287 ~ 310	36 ~ 39	200
N35EH	1.18	11.8	876	11	2388	30	263 ~ 287	33 ~ 36	200
N33EH	1.13	11.3	844	10.6	2388	30	247 ~ 270	31 ~ 33	200
N30EH	1.1	11	796	10	2388	30	223 ~ 247	28 ~ 31	200
N28EH	1.05	10.5	756	9.5	2388	30	207 ~ 230	26 ~ 29	200
N52UH	1.42	14.2	1018	12.8	1911	24	390 ~ 422	49 ~ 53	180
N50UH	1.39	13.9	1018	12.8	1911	24	374 ~ 406	47 ~ 51	180
N48UH	1.37	13.7	1018	12.8	1911	24	358 ~ 390	45 ~ 49	180
N45UH	1.33	13.3	995	12.5	1911	24	342 ~ 366	43 ~ 46	180
N42UH	1.29	12.9	957	11.8	1990	25	318 ~ 342	40 ~ 43	180
N40UH	1.26	12.6	930	11.5	1990	25	302 ~ 326	38 ~ 41	180
N38UH	1.23	12.3	910	11.1	1990	25	287 ~ 310	36 ~ 39	180
N35UH	1.18	11.8	876	11	1990	25	263 ~ 287	33 ~ 36	180
N33UH	1.13	11.3	844	10.6	1990	25	247 ~ 270	31 ~ 33	180
N30UH	1.1	11	796	10	1990	25	223 ~ 247	28 ~ 31	180
N28UH	1.05	10.5	756	9.5	1990	25	207 ~ 230	26 ~ 29	180
N52SH	1.42	14.2	1018	12.8	1512	19	390 ~ 422	49 ~ 53	150
N50SH	1.39	13.9	1018	12.8	1512	19	374 ~ 406	47 ~ 51	150
N48SH	1.37	13.7	1018	12.8	1512	19	358 ~ 390	45 ~ 49	150
N45SH	1.33	13.3	995	12.5	1592	20	342 ~ 366	43 ~ 46	150
N42SH	1.29	12.9	957	11.8	1592	20	318 ~ 342	40 ~ 43	150
N40SH	1.26	12.6	930	11.5	1592	20	302 ~ 326	38 ~ 41	150
N38SH	1.23	12.3	910	11.1	1592	20	287 ~ 310	36 ~ 39	150
N35SH	1.18	11.8	876	11	1592	20	263 ~ 287	33 ~ 36	150
N33SH	1.13	11.3	844	10.6	1592	20	247 ~ 270	31 ~ 33	150
N30SH	1.1	11	796	10	1592	20	223 ~ 247	28 ~ 31	150
N28SH	1.05	10.5	756	9.5	1592	20	207 ~ 230	26 ~ 29	150
N55H	1.45	14.5	1035	13	1274	16	406 ~ 438	51 ~ 55	120
N52H	1.42	14.2	1035	13	1274	16	390 ~ 422	49 ~ 53	120
N50H	1.39	13.9	1035	13	1274	16	374 ~ 406	47 ~ 51	120
N48H	1.37	13.7	1018	12.8	1274	16	358 ~ 390	45 ~ 49	120
N45H	1.33	13.3	995	12.5	1353	17	342 ~ 366	43 ~ 46	120
N42H	1.29	12.9	957	12	1353	17	318 ~ 342	40 ~ 43	120
N40H	1.26	12.6	930	117	1353	17	302 ~ 326	38 ~ 41	120
N38H	1.23	12.3	910	11.4	1353	17	287 ~ 310	36 ~ 39	120
N35H	1.18	11.8	876	11	1353	17	263 ~ 287	36 ~ 39	120
N33H	1.13	11.3	844	10.6	1353	17	247 ~ 270	33 ~ 36	120
N30H	1.1	11	796	10	1353	17	223 ~ 247	31 ~ 33	120
N28H	1.05	10.5	756	9.5	1353	17	207 ~ 230	28 ~ 31	120
N55M	1.45	14.5	995	12.5	1035	13	406 ~ 438	51 ~ 55	100
N52M	1.42	14.2	995	12.5	1035	13	390 ~ 422	49 ~ 53	100
N50M	1.39	13.9	1035	13	1114	14	374 ~ 406	47 ~ 51	100
N48M	1.37	13.7	1012	12.7	1114	14	358 ~ 390	45 ~ 49	100
N45M	1.33	13.3	971	12.2	1114	14	342 ~ 366	43 ~ 46	100
N42M	1.29	12.9	938	11.8	1114	14	318 ~ 342	40 ~ 43	100
N40M	1.26	12.6	910	11.4	1114	14	302 ~ 326	38 ~ 41	100
N38M	1.23	12.3	876	11	1114	14	287 ~ 310	36 ~ 39	100
N35M	1.18	11.8	860	10.8	1114	14	263 ~ 287	33 ~ 36	100
N33M	1.13	11.3	796	10	1114	14	247 ~ 270	31 ~ 33	100
N30M	1.1	11	796	10	1114	14	223 ~ 247	28 ~ 31	100
N28M	1.05	10.5	756	9.5	1114	14	207 ~ 230	26 ~ 29	100
N55	1.45	14.5	836	10.5	875	11	406 ~ 438	51 ~ 55	80
N54	1.45	14.4	836	10.5	876	11	406 ~ 430	51 ~ 54	80
N52	1.42	14.2	860	10.8	960	12	390 ~ 422	49 ~ 53	80
N50	1.39	13.9	860	10.8	960	12	374 ~ 406	47 ~ 51	80
N48	1.37	13.7	860	10.8	960	12	358 ~ 390	45 ~ 49	80
N45	1.33	13.3	836	10.5	960	12	342 ~ 366	43 ~ 46	80
N42	1.29	12.9	836	10.5	960	12	318 ~ 342	40 ~ 43	80
N40	1.26	12.6	836	10.5	960	12	302 ~ 326	38 ~ 41	80
N38	1.23	12.3	836	10.5	960	12	287 ~ 310	36 ~ 39	80
N35	1.18	11.8	836	10.5	960	12	263 ~ 287	33 ~ 36	80
N33	1.13	11.3	796	10	960	12	247 ~ 270	31 ~ 34	80
N30	1.08	10.8	804	10.1	876	11	223 ~ 255	28 ~ 32	60
N30C	1.08	10.8	804	10.1	716	9	223 ~ 255	28 ~ 32	60
N28	1.04	10.4	772	9.7	557	7	207 ~ 230	28 ~ 31	60

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


Disc Axial	Disc Diametrical	Cylinder Axial	Cylinder Diametrical

Ring Axial	Ring Diametrical	Ring Cylinder Axial	Ring Cylinder Diametrical

Block-Rectangle Thickness	Block-Rectangle Length

Arc Width	Arc Height	Arc Diametrical	Arc Diametrical

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Sintered NdFeB Permanent Magnetic Materials

Zhejiang Zhongke Magnetic Industry Co., Ltd is leading strong Neodymium Block Magnet manufacturers and suppliers in China, The company's current production process of sintered NdFeB permanent magnet materials can be divided into two parts: the blank process (also known as the "front process" in the industry) and the finished product process (also known as the "post process" in the industry): the blank process is the praseodymium Neodymium metal, pure iron, ferroboron and other raw materials are used to make NdFeB blanks; the finished product process is to process NdFeB blanks by mechanical processing and surface treatment to obtain NdFeB magnets. We also OEM/ODM custom sintered Supper strong NdFeB Neodymium Block Magnet. The specific production process flow chart is as follows:

Raw Material Ratio

Mix solid raw materials such as praseodymium and neodymium metals, pure iron, and ferroboron in proportion.
Smelting

The mixed raw materials are smelted through the smelting furnace, and then the quick-setting thin strip alloy sheet is formed by stripping.
Crushing Powder

The rapid-setting thin strip alloy flakes are crushed into coarse alloy powder through the secondary crushing furnace, and then fine alloy powder is made into alloy powder through jet milling.
Press Molding

Under the protection of nitrogen, the powder is made into a compact by pressing.
Vacuum Sinter

The compact is heated to a high temperature in a sintering furnace in a vacuum environment and then subjected to aging heat treatment to form a NdFeB blank.
Mechanical Processing

Use professional equipment to process the blank according to the specific requirements of the order for shape and size, including grinding, wire cutting, slicing, punching, etc.
Diffusion Of Grain Boundaries

Cover the surface of the magnet with heavy rare earth metal or compound, and diffuse the heavy rare earth element into the interior of the sintered NdFeB magnet by heating
Surface Treatment

In order to meet the performance requirements of wear resistance and corrosion resistance, mechanical grinding and electrochemical treatment are carried out on the surface of the magnet.
Magnetizing

According to the needs of the order, magnetize the magnet in the magnetic field using a magnetizer.
Inspection and Packaging

According to the requirements of the order, the magnetic properties, appearance, size, corrosion resistance and other properties of the magnets are inspected, and the packaging and storage can only be carried out after passing the inspection.

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Production Advantages

Zhongke is committed to becoming a world-renowned supplier of permanent magnet material application solutions in the field of new generation consumer electronics and energy-saving home appliances. Welcome to visit our NdFeB Block Magnet factory in China.

Milling Process

The company applies technologies such as casting columnar crystal growth control technology, grain refinement and micro-optimization technology, etc., and is committed to improving the consistency of powder and giving full play to the performance potential of rare earth. By improving the smelting microstructure, applying fine-grain technology, and optimizing the mixing process, etc., significantly improving the performance of NdFeB magnets.
Forming And Sintering Process

The company has applied and improved low-oxygen magnet preparation technology and cold isostatic pressing technology, so that NdFeB magnets are in a low-oxygen state during the pressing process, and the preparation of molding blanks is continuously optimized, which effectively reduces the loss of rare earth. The application of low-temperature sintering heat treatment technology has further improved the sintering process. Adjusting the temperature to a suitable state can give full play to the performance of the formula. The representative products are high-performance N55 magnets prepared by low-oxygen technology and N38UH magnets produced by near-net molding technology.
Processing Technology

In order to pursue the accurate precision of customer customization, the company applies high-performance ultra-thin small special-shaped permanent magnet preparation technology to carry out high-efficiency and low-loss precision machining of NdFeB blanks, breaking through the technical bottleneck of high-performance thin and small magnet processing difficulty, and Strictly control product appearance defects through intelligent image appearance automatic inspection technology to improve inspection efficiency and accuracy.

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NdFeB Block Magnets Suppliers

Product category

Custom Forms

Neodymium Block Magnet

Description:

Related products

Sintered NdFeB Permanent Magnetic Materials

Raw Material Ratio

Smelting

Crushing Powder

Press Molding

Vacuum Sinter

Mechanical Processing

Diffusion Of Grain Boundaries

Surface Treatment

Magnetizing

Inspection and Packaging

Production Advantages

Milling Process

Forming And Sintering Process

Processing Technology

Certificate

News and Event

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