Ferrite magnet and isotropic magnet can be substituted by Anisotropic Bonded NdFeB Magnets in the field of micro motor and sensor, because they have higher magnetic properties than MQ(nearly twice higher than MQ). This kind of substitution can not only fulfill miniaturization and weight mitigation, but also increase the performance and lower the cost. At here, we only discuss the application for micro motor.

   Main properties in application of the micro motor

1.Size and weight of motor can be greatly lowered , almost 50% cut

2.Overall cost of the motor can be prominently lowered

3.The performance of motor can be increased a lot.

4.thermal radiation of the motor can be improved,

  and better Temperature Rise can be achieved

  Proposals for motor designing which use Anisotropic Bonded NdFeB Magnet ring instead of ferrite magnet.

1.Surface magnet is adopted, which is good for the motor to generate high torque. Meanwhile, energy consuming can be lowered as well through shrinking air gap.

2.Four phase multi-pole magnetic rings is adopted, therefore, the operation of motor can be more stable and the noise is lower than usual.(pic 1)

  The example for manufacture motor that adopting anisotropic bonded NdFeB magnetic rings to instead of ferrite magnet.
1 、 50W automobile motor （Pic 2 ）
1）Adopting four phase multi-pole anisotropic bonded NdFeB magnetic ring instead of two phase ferrite magnet tile.
2）weight loss 50 ％,size loss 62 ％.
3）moment improve 20 ％，most efficient improve 15 ％.
4）reduce the cost about 10 ％.
5）Application for seat adjustment motor.

motor Size : 45 × L 68 mm
motor weight: 460g
sinter ferrite: 4MGOe
magnet weight： 80g

Pic(2) 50W motor comparison

2 、 120W automobile motor （Pic 3 ）
1）Adopting four phase multi-pole anisotropic bonded NdFeB magnetic ring instead of two phase ferrite magnet tiles.
2）weight loss 70 ％,size loss 59 ％.
3）moment improve 6 ％，most efficient improve 10％.
4）Application for fan and windscreen wiper motor

motor Size : Φ 67 × L 82mm
motor weight: 856g
sinter ferrite: 4MGOe
magnet weight：133g
two phase ferrite magnet tiles

Pic(3) 120W motor comparison

  Example for adopting  anisotropic NdFeB magnetic rings instead of  sinter NdFeB magnet to manufacture motor
1 、BLDC motor with low speed （Pic 4 ）
1）Adopting ten phase multi-pole anisotropic bonded NdFeB magnetic ring instead of 14 pieces sinter NdFeB magnet  tiles + fix  magnet cover
2）If got same moment, reduce the cost about 15％.
3）Application for electric power to control the motor

motor Size : Φ 85 × L 200 mm
sinter NdFeB: 39 MGOe
magnet weight: 100g
sinter NdFeB 14 pieces magnet + fix magnet cover

Pic(4) BLDC motor with low speed comparison

2 、BLDC motor with high speed（Pic5 ）
1）four phase radiation oriented anisotropic bonded NdFeB magnetic ring instead of  4 pieces sinter NdFeB magnet  tiles
2）size loss 41 ％
3）If got same moment, reduce the cost about  20 ％
4）Application for air-conditioning compressor

motor Size : Φ 112 × L 60 mm
sinter NdFeB: 39 MGOe
magnet weight: 84
interior motor with sinter NdFeB

Pic(5) BLDC motor with high speed comparison

Example for adopting  anisotropic NdFeB magnetic ring instead of  isotropic  NdFeB magnet to manufacture motor
1 、high moment motor （Pic 6 ）
1）moment improve  30 ％
2）weight loss 41 ％
3）Application for transmit motor

four phase isotropic  NdFeB
magnet weight:31g

Pic(6) high moment motor comparison

2 、direct-drive motor （Pic 7 ）
1）moment improve 30 ％
2）weight loss49 ％
3）reduce the cost about 10 ％。
4）Application for

four phase isotropic  NdFeB
magnet weight:155g

Pic(7) direct-drive motor comparison