Motor
A motor includes a magnet and a coil. α2=[{(Br2−Br1)/Br1}/(T2−T1)]×100≥−0.10 and α3=[{(Br3−Br1)/Br1}/(T3−T1)]×100≤−0.12 are satisfied. In the magnet, Br1 (mT) is a residual magnetic flux density at T1 (° C.), Br2 (mT) is a residual magnetic flux density at T2 (° C.), and Br3 (mT) is a residual magnetic flux density at T3 (° C.), and α2 (%/° C.) is a temperature coefficient at a target temperature of T2 (° C.) with respect to a reference temperature of T1 (° C.), and α3 (%/° C.) is a temperature coefficient at a target temperature of T3 (° C.) with respect to a reference temperature of T1 (° C.) in conditions of T1=23, T2=60, and T3=180.
1. A motor comprising:
a rotor comprising a rotor iron core, a permanent magnet being embedded in a slot in the rotor iron core; and
a stator separated from the rotor by a space, the stator comprising a stator iron core and a coil, wherein
α2=[{(Br2−Br1)/Br1}/(T2−T1)]×100≥−0.10 and
α3=[{(Br3−Br1)/Br1}/(T3−T1)]×100≤−0.12 are satisfied, where in the magnet,
Br1 (mT) is a residual magnetic flux density at T1 (° C.), Br2 (mT) is a residual magnetic flux density at T2 (° C.), and Br3 (mT) is a residual magnetic flux density at T3 (° C.), and
α2 (%/° C.) is a temperature coefficient at a target temperature of T2 (° C.) with respect to a reference temperature of T1 (° C.), and α3 (%/° C.) is a temperature coefficient at a target temperature of T3 (° C.) with respect to a reference temperature of T1 (° C.) in conditions of T1=23, T2=60, and T3=180.
2. The motor according to claim 1 , wherein Br1≥1300 mT is satisfied.
3. The motor according to claim 2 , wherein Br2≥1250 mT is satisfied.
4. The motor according to claim 3 , wherein Br3≤1100 mT is satisfied.
5. The motor according to claim 1 , wherein
the magnet is an R-T-B based magnet, and
R is one or more rare earth elements, T is one or more transition metal elements, and B is boron.
6. The motor according to claim 2 , wherein
the magnet is an R-T-B based magnet, and
R is one or more rare earth elements, T is one or more transition metal elements, and B is boron.
7. The motor according to claim 3 , wherein
the magnet is an R-T-B based magnet, and
R is one or more rare earth elements, T is one or more transition metal elements, and B is boron.
8. The motor according to claim 4 , wherein
the magnet is an R-T-B based magnet, and
R is one or more rare earth elements, T is one or more transition metal elements, and B is boron.
9. The motor according to claim 5 , wherein
R contains Nd, and
T contains Fe.
10. The motor according to claim 6 , wherein
R contains Nd, and
T contains Fe.
11. The motor according to claim 7 , wherein
R contains Nd, and
T contains Fe.
12. The motor according to claim 8 , wherein
R contains Nd, and
T contains Fe.
13. The motor according to claim 5 , wherein
the R-T-B based magnet contains Si at 0 to 0.4 wt % (including zero), where a whole of the R-T-B based magnet is 100 wt %.
14. The motor according to claim 6 , wherein
the R-T-B based magnet contains Si at 0 to 0.4 wt % (including zero), where a whole of the R-T-B based magnet is 100 wt %.
15. The motor according to claim 7 , wherein
the R-T-B based magnet contains Si at 0 to 0.4 wt % (including zero), where a whole of the R-T-B based magnet is 100 wt %.
16. The motor according to claim 8 , wherein
the R-T-B based magnet contains Si at 0 to 0.4 wt % (including zero), where a whole of the R-T-B based magnet is 100 wt %.
17. The motor according to claim 1 , wherein the motor is an IPM motor.
18. The motor according to claim 2 , wherein the motor is an IPM motor.
19. The motor according to claim 3 , wherein the motor is an IPM motor.
20. The motor according to claim 4 , wherein the motor is an IPM motor.