Motor having rotor formed by using thermosetting resin
First Claim
Patent Images
1. A motor comprising:
- (a) a rotor including;
a cylindrical magnet including a plurality of poles;
a shaft coaxially situated within said magnet; and
a molded member comprising thermosetting resin, the thermosetting resin includes unsaturated polyester resin whose weight density ratio is not less than 10% and not more than 30%, said molded member located between said cylindrical magnet and said shaft;
(b) a stator facing said rotor.
1 Assignment
0 Petitions
Accused Products
Abstract
A rotor of a motor has a cylindrical magnet coaxially disposed with a shaft. The shaft and the magnet are bonded with thermosetting resin formed by injection molding. Since the molding shrinkage of the thermosetting resin is so small that a high preciseness is achieved in the motor structure. This precision structure can reduce vibration due to unbalance of a rotor. Also, an annealing process, in which a motor is left at a temperature higher than the limit temperature for operating the motor, can be eliminated. As a result, the efficiency of producing the motor can be improved.
41 Citations
12 Claims
-
1. A motor comprising:
-
(a) a rotor including;
a cylindrical magnet including a plurality of poles;
a shaft coaxially situated within said magnet; and
a molded member comprising thermosetting resin, the thermosetting resin includes unsaturated polyester resin whose weight density ratio is not less than 10% and not more than 30%, said molded member located between said cylindrical magnet and said shaft;
(b) a stator facing said rotor.
-
-
2. A motor comprising:
-
(a) a rotor including;
a cylindrical magnet including a plurality of poles;
wherein a ratio of an axial height vs. an inner diameter of said magnet is not less than 0.3, a molded member comprising thermosetting resin, wherein the thermosetting resin includes unsaturated polyester resin whose weight density ratio is not less than 10% and not more than 30%, said molded member located between said cylindrical magnet and said shaft as said cylindrical magnet and shaft extend coaxially to each other;
(b) a stator facing rotor.
-
-
3. A motor comprising:
-
(a) a rotor including;
two cylindrical magnets including a plurality of poles and disposed coaxially with each other;
a spacer having a section contacting with inner walls of said two magnets and a section separating said two magnets, said spacer having a T-shaped cross-section;
a shaft coaxially situated within said magnets and said spacer; and
a molded member comprising thermosetting resin, wherein the thermosetting resin includes unsaturated polyester resin whose weight density ratio is not less than 10% and not more than 30%, said molded member being located between and in contact with said shaft and said magnets as said shaft and magnets extend coaxially to each other;
(b) a stator facing said rotor.
-
-
4. A motor comprising:
-
(a) a rotor including;
a cylindrical magnet including a plurality of poles;
a shaft coaxially situated within said magnet; and
a molded member comprising thermosetting resin, wherein the thermosetting resin includes unsaturated polyester resin whose weight density ratio is not less than 10% and not more than 30%, and thermoplastic resin whose weight ratio with respect to the unsaturated polyester resin is not less than 10% and not more than 30%, said molded member located between said cylindrical magnet and said shaft;
(b) a stator facing said rotor.
-
-
5. A motor comprising:
-
(a) a rotor including;
a cylindrical magnet including a plurality of poles wherein a ratio of an axial height vs. an inner diameter of said magnet is not less than 0.3;
a shaft coaxially situated within said magnet; and
a molded member comprising thermosetting resin, wherein the thermosetting resin includes unsaturated polyester resin whose weight density ratio is not less than 10% and not more than 30%, and thermoplastic resin whose weight ratio with respect to the unsaturated polyester resin is not less than 10% and not more than 30%, said molded member located between said cylindrical magnet and said shaft;
(b) a stator facing said rotor.
-
-
6. A motor comprising:
-
(a) a rotor including;
two cylindrical magnets including a plurality of poles and disposed coaxially with each other;
a spacer having a section contacting with inner walls of said two magnets and a section separating said two magnets, said spacer having a T-shaped cross-section;
a shaft coaxially situated within said magnets and said spacer; and
a molded member comprising thermosetting resin, said molded member being located between and in contact with said shaft and said magnets as said shaft and magnets extend coaxially to each other, wherein the thermosetting resin includes unsaturated polyester resin whose weight density ratio is not less than 10% and not more than 30%, and thermoplastic resin whose weight ratio with respect to the unsaturated polyester resin is not less than 10% and not more than 30%, (b) a stator facing said rotor.
-
-
7. A motor comprising:
-
(a) a rotor including;
a cylindrical magnet including a plurality of poles;
a shaft coaxially situated within said magnet; and
a molded member comprising thermosetting resin, wherein the thermosetting resin includes unsaturated polyester resin whose weight density ratio is not less than 10% and not more than 30%, and glass fiber whose weight density ratio is not less than 5% and not more than 15%, said molded member located between said cylindrical magnet and said shaft;
(b) a stator facing said rotor.
-
-
8. A motor comprising:
-
(a) a rotor including;
a cylindrical magnet including a plurality of poles wherein a ratio of an axial height vs. an inner diameter of said magnet is not less than 0.3;
a shaft coaxially situated within said magnet; and
a molded member comprising thermosetting resin, wherein the thermosetting resin includes unsaturated polyester resin whose weight density ratio is not less than 10% and not more than 30%, and glass fiber whose weight density ratio is not less than 5% and not more than 15%, said molded member located between said cylindrical magnet and said shaft;
(b) a stator facing said rotor.
-
-
9. A motor comprising:
-
(a) a rotor including;
two cylindrical magnets including a plurality of poles and disposed coaxially with each other;
a spacer having a section contacting with inner walls of said two magnets and a section separating said two magnets, said spacer having a T-shaped cross-section;
a shaft coaxially situated within said magnets and said spacer; and
a molded member comprising thermosetting resin, wherein the thermosetting resin includes unsaturated polyester resin whose weight density ratio is not less than 10% and not more than 30%, and glass fiber whose weight density ratio is not less than 5% and not more than 15%, said molded member being located between and in contact with said shaft and said magnets as said shaft and magnets extend coaxially to each other;
(b) a stator facing said rotor.
-
-
10. A motor comprising:
-
(a) a rotor including;
a cylindrical magnet including a plurality of poles;
a shaft coaxially situated within said magnet; and
a molded member comprising thermosetting resin, wherein the thermosetting resin includes thermoplastic resin whose weight density ratio is not less than 10% and not more than 15%, said molded member located between said cylindrical magnet and said shaft;
(b) a stator facing said rotor.
-
-
11. A motor comprising:
-
(a) a rotor including;
a cylindrical magnet including a plurality of poles wherein a ratio of an axial height vs. an inner diameter of said magnet is not less than 0.3;
a shaft coaxially situated within said magnet; and
a molded member comprising thermosetting resin, wherein the thermosetting resin includes thermoplastic resin whose weight density ratio is not less than 10% and not more than 15%, said molded member located between said cylindrical magnet and said shaft;
(b) a stator facing said rotor.
-
-
12. A motor comprising:
-
(a) a rotor including;
two cylindrical magnets including a plurality of poles and disposed coaxially with each other;
a spacer having a section contacting with inner walls of said two magnets and a section separating said two magnets, said spacer having a T-shaped cross-section;
a shaft coaxially situated within said magnets and said spacer; and
a molded member comprising thermosetting resin, wherein the thermosetting resin includes thermoplastic resin whose weight density ratio is not less than 10% and not more than 15%, said molded member being located between and in contact with said shaft and said magnets as said shaft and magnets extend coaxially to each other;
(b) a stator facing said rotor.
-
Specification