BULK AMORPHOUS METAL MAGNETIC COMPONENTS FOR ELECTRIC MOTORS

• US 20020074885A1
• Filed: 11/06/1998
• Published: 06/20/2002
• Est. Priority Date: 11/06/1998
• Status: Active Grant

• Current Assignee: Nicholas John Decristofaro, Peter Joseph Stamatis
• Original Assignee: Alliedsignal Inc. (Honeywell International Inc.)
• Inventors: STAMATIS, PETER JOSEPH, DECRISTOFARO, NICHOLAS JOHN
• Granted Patent: US 6,420,813 B1
• Time in Patent Office: Days
• US Class Current: 310/152
• CPC Class Codes: H01F 1/15333 containing nanocrystallites, e.g. obtained by annealing
• CPC Class Codes: H02K 1/02 characterised by the magnetic material
• CPC Class Codes: H02K 1/06 characterised by the shape, form or construction

Abstract

A high efficiency electric motor has a generally polyhedrally shaped bulk amorphous metal magnetic component in which a plurality of layers of amorphous metal strips are laminated together to form a generally three-dimensional part having the shape of a polyhedron. The bulk amorphous metal magnetic component may include an arcuate surface, and preferably includes two arcuate surfaces that are disposed opposite to each other. The magnetic component is operable at frequencies ranging from between approximately 60 Hz and 20,000 Hz and exhibits (i) a core-loss of less than or approximately equal to 1 watt-per-kilogram of amorphous metal material when operated at a frequency of approximately 60 Hz and at a flux density of approximately 1.4 Tesla (T); (ii) a core-loss of less than or approximately equal to 20 watts-per-kilogram of amorphous metal material when operated at a frequency of approximately 1000 Hz and at a flux density of approximately 1.4 T and (iii) a core-loss of less than or approximately equal to 70 watt-per-kilogram of amorphous metal material when operated at a frequency of approximately 20,000 Hz and at a flux density of approximately 0.30T. Performance characteristics of the bulk amorphous metal magnetic component of the present invention are significantly better when compared to silicon-steel components operated over the same frequency range.

Claims

1. An electric motor having at least one bulk amorphous metal magnetic component comprising a plurality of substantially similarly shaped layers of amorphous metal strips laminated together to form a polyhedrally shaped part.

2. An electric motor as recited by claim 1, wherein each of said amorphous metal strips having a composition defined essentially by the formula:

M_70-85 Y_5-20 Z_0-20, subscripts in atom percent, where “

M”

is at least one of Fe, Ni and Co, “

Y”

is at least one of B, C and P, and “

Z”

is at least one of Si, Al and Ge;

with the provisos that (i) up to 10 atom percent of component “

M”

can be replaced with at least one of the metallic species Ti, V, Cr, Mn, Cu, Zr, Nb, Mo, Ta and W, and (ii) up to 10 atom percent of components (Y+Z) can be replaced by at least one of the non-metallic species In, Sn, Sb and Pb.

3. An electric motor as recited by claim 2, wherein each of said strips has a composition defined essentially by the formula Fe₈₀B₁₁Si₉.

4. An electric motor as recited by claim 2, wherein said bulk amorphous metal magnetic component comprises a part of a stator of said electric motor.

5. An electric motor as recited by claim 2, wherein said bulk amorphous metal magnetic component comprises a stator of said electric motor.

6. An electric motor as recited by claim 2, wherein said bulk amorphous metal magnetic component comprises a part of a rotor of said electric motor.

7. An electric motor as recited by claim 2, wherein said bulk amorphous metal magnetic component comprises a rotor of said electric motor.

8. An electric motor as recited by claim 2, wherein said amorphous metal magnetic component comprises a rotor and a stator of said electric motor.

9. An electric motor as recited by claim 1, wherein said bulk amorphous metal magnetic component a core-loss of less than or approximately equal to 1 watt-per-kilogram of amorphous metal material when operated at a frequency of approximately 60 Hz and a flux density of approximately 1.4T.

10. An electric motor as recited by claim 1, wherein said bulk amorphous metal magnetic component a core-loss of less than or approximately equal to 20 watts-per-kilogram of amorphous metal material when operated at a frequency of approximately 1000 Hz and a flux density of approximately 1.4T.

11. An electric motor as recited by claim 1, wherein said bulk amorphous metal magnetic component a core-loss of less than or approximately equal to 70 watts-per-kilogram of amorphous metal material when operated at a frequency of approximately 20,000 Hz and a flux density of approximately 0.30T.

13. An electric motor as recited by claim 12, wherein said magnetic component is a stator.

15. An electric motor as recited by claim 12, wherein said magnetic component is a rotor.

16. An electric motor as recited by claim 12, wherein said motor comprises a member selected from the group consisting of squirrel cage motors, reluctance synchronous motors and switched reluctance motors.

17. An electric motor as recited by claim 13, wherein said motor comprises a member selected from the group consisting of variable reluctance motors, eddy current motors, squirrel cage motors, reluctance synchronous motors and switched reluctance motors.

18. An electric motor as recited by claim 14, wherein said motor comprises a member selected from the group consisting of squirrel cage motors, reluctance synchronous motors and switched reluctance motors.

12. In an electric motor, at least one bulk amorphous metal magnetic component comprising a plurality of substantially similarly shaped layers of amorphous metal strips laminated together to form a polyhedrally shaped part.