GEAR MOTOR INCLUDING A COMPACT MULTIPLE-PHASE ELECTRIC MOTOR

• US 20110031824A1
• Filed: 07/11/2008
• Published: 02/10/2011
• Est. Priority Date: 07/24/2007
• Status: Active Grant

• Current Assignee: Moving Magnet Technologies
• Original Assignee: Moving Magnet Technologies
• Inventors: Prudham, Daniel
• Granted Patent: US 8,339,003 B2
• Time in Patent Office: Days
• US Class Current: 310/48
• CPC Class Codes: H02K 1/146 consisting of a generally annular yoke with salient poles
• CPC Class Codes: H02K 21/14 with magnets rotating within the armatures
• CPC Class Codes: H02K 2211/03 Machines characterised by circuit boards, e.g. pcb
• CPC Class Codes: H02K 7/1163 where at least two gears have non-parallel axes without having orbital motion
• CPC Class Codes: H02K 7/1166 comprising worm and worm-wheel structural association with bearings specially adapted for worm gear drives H02K7/081

Abstract

The invention relates to a gear motor including a multiple-phase electric motor formed by a stator portion excited by electric coils and by a rotor having N pairs of poles radially magnetised in alternating directions, the stator portion including two angular sectors alpha-1 and alpha-2 with respective radii R1 and R2, comprising wide teeth and narrow teeth radially extending from an annular crown, characterised in that the wide teeth have a width higher than or equal to twice the width of the narrow teeth, in that the notch width is higher than the width of a narrow tooth, in that the angular sector alpha-1 is lower than 220° and includes all the coils, and in that the ratio R1/R2 ranges from 1.2 to 2.

Claims

1. Gear motor including a multiphase electric motor formed by a stator portion excited by electric coils and by a rotor having N pairs of poles radially magnetized in alternating directions, the stator portion including two angular sectors alpha-1 and alpha-2, with respective radii R1 and R2, comprising wide teeth and narrow teeth extending radially from an annular crown, characterized in that the wide teeth have a width greater than or equal to twice the narrow teeth width, in that the notch width is greater than a narrow tooth width, in that the angular sector alpha-1 is less than 220°

and includes all the coils, and in that the R1/R2 ratio ranges from 1.2 et 2.

2. Electrical gear motor according to claim 1, wherein the electrical motor is triphasic and the stator portion is activated by at least three electrical coils.

3. Electrical gear motor according to claim 1 or 2, wherein N is equal to 5 or to 7, and wherein the stator portion of the engine presents 6 wide teeth and 6 narrow teeth, and is activated by 3 coils placed at 60°

from one another.

4. Electrical gear motor according to one of claim 1 or 2, including elements for detecting position located in angular sector alpha 2, and acting with the frontal extremity of the rotor.

5. Electrical gear motor according to one of claim 1 or 2, wherein the wheel of the first reduction level is contained in the height of the coil.

6. Electrical gear motor according to claim 3, including elements for detecting position located in angular sector alpha 2, and acting with the frontal extremity of the rotor.

7. Electrical gear motor according to claim 3, wherein the wheel of the first reduction level is contained in the height of the coil.

8. Electrical gear motor according to claim 4, wherein the wheel of the first reduction level is contained in the height of the coil.

9. Electrical gear motor according to claim 6, wherein the wheel of the first reduction level is contained in the height of the coil.