The effect of temperature (25 〜200 ℃) on magnetic performance of 33EH sintered NdFeB (/% ：27. 01 Nd

64. 75Fe

0. 35Al

3. 15Dy

1. 56Co

2. 27Cu

0. 90Ga) including residual magnet and magnet loss etc. has been tested and studied. Test results show that with increasing temperature

the residual magnet decreases linearly

at 100℃; the residual magnet decreases by 7. 6% and at 200 X. the residual magnet decreases by 22%. At 25 - 100 °C with increasing the temperature

the open-circuit magnet decreases by about 1%

at 100 ~ 200℃ with increasing the temperature

the open-circuit magnet loss increases dramatically

at 200 ℃ the open-circuit magnet decreases by 44%. The optimum service temperature of 33EH sintered NdFeB permanent magnets is ≤100 °C.