OPTIMIZED ELECTRIC MOTOR WITH NARROW TEETH

• US 20150263572A1
• Filed: 07/30/2013
• Published: 09/17/2015
• Est. Priority Date: 08/01/2012
• Status: Active Grant

• Current Assignee: Moving Magnet Technologies
• Original Assignee: Moving Magnet Technologies
• Inventors: Biwersi, Stphane, Hyppias, Arnaud, Tavernier, Stphane
• Granted Patent: US 10,164,486 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H02K 1/141 consisting of C-shaped cores
• CPC Class Codes: H02K 1/146 consisting of a generally annular yoke with salient poles
• CPC Class Codes: H02K 1/148 Sectional cores H02K1/141 takes precedence
• CPC Class Codes: H02K 1/2706 Inner rotors
• CPC Class Codes: H02K 1/2795 the rotor consisting of two or more circumferentially positioned magnets
• CPC Class Codes: H02K 2213/03 Machines characterised by numerical values, ranges, mathematical expressions or similar information
• CPC Class Codes: H02K 29/03 with a magnetic circuit specially adapted for avoiding torque ripples or self-starting problems
• CPC Class Codes: H02K 7/116 with gears

Abstract

The present disclosure relates to a mono- or polyphase electric motor including a stator carrying at least three coils and consisting of 12×N straight teeth extending radially, N being an integer greater than or equal to 1, and of an equal peak divergence alpha, measured at their end from the centre of the motor, and a rotor exhibiting P pairs of magnetized poles such that P=5+2×R, P being a non-multiple of three, R being an integer greater than or equal to 0, alpha lying between 360°(12×N)/3 and 360°(12×N)/2.

Claims

1. A mono- or multiphase electric motor comprising a stator carrying at least three coils and 12×

N straight teeth extending radially, with N being an integer greater than or equal to 1, and of an equal peak divergence alpha, measured at their ends from the centre of the motor, and a rotor having P pairs of magnetized poles such that P=5×

2+R, where P is a non-multiple of three, with R being an integer greater than or equal to 0, and alpha being between 360°

/(12×

N)/3 and 360°

/(12×

N)/2.

2. An electric motor according to claim 1, wherein alpha is between 360°

/(12×

N)/3 and 360°

/(12×

N)/2.1.

3. An electric motor according to claim 1, wherein one tooth out of two carries a coil.

4. An electric motor according to claim 1, wherein all of the teeth carry coils.

5. An electric motor according to claim 1, wherein the coils are three in number, are installed on teeth spaced by 60°

and generally distributed over a tooth pitch (theta) of less than or equal to 120°

.

6. An electric motor according to claim 1, wherein the P pairs of poles on the rotor are magnetized radially.

7. An electric motor according to claim 1, wherein the P pairs of poles on the rotor are magnetised axially.

8. An electric motor according to claim 1, wherein the stator is formed by a stack of two types of different metal plates with the adjacent stator teeth being in contact on the first type of metal plate by saturable magnetic necks.

9. An electric motor according to claim 1, wherein at least one ferromagnetic ring is in the air gap between the teeth of the stator and the magnetic rotor.

10. An electric motor according to claim 1, wherein the stator comprises two types of metal plates forming a recess adapted to receive a ferromagnetic ring.

11. An electric motor according to claim 1, wherein the stator has an outer ring positioned after the winding of the teeth so as to provide the closing of the magnetic circuit.

12. An electric motor according to claim 1, wherein it has 5 pairs of magnetic poles and 12 radial teeth and, the peak divergence of which measured at the ends of alpha teeth is equal to 13°

, with one tooth out of two being surrounded by an electric coil, with two coils spaced by a mechanical 180°

round the centre of the motor forming an electric phase and the assembly of 6 coils forming a three-phase motor.

13. An electric motor according to claim 12, wherein the teeth which do not carry the coils have a bore in the portion flaring to form a peripheral belt.

14. A geared motor comprising a motor comprising:

a stator carrying at least three coils and 12×

N straight teeth extending radially, with N being an integer greater than or equal to 1, and of an equal peak divergence alpha, measured at their ends from the centre of the motor, and a rotor having P pairs of magnetized poles such that P=5×

2+R, where P is a non-multiple of three, with R being an integer greater than or equal to 0, and alpha being between 360°

/(12×

N)/3 and 360°

/(12×

N)/2;

a motion mechanical transformation set;

a shaft at the output of the transformation set; and

an elastic return system positioned upstream or downstream of the mechanical transformation set.