Electromagnets with adjacent groups of electromagnets having different switching phases

• US 4,754,207 A
• Filed: 09/23/1986
• Issued: 06/28/1988
• Est. Priority Date: 04/16/1984
• Status: Expired due to Term

• Current Assignee: Andreas Grundl, Gotz Heidelberg
• Original Assignee: Andreas Grundl, Gotz Heidelberg
• Inventors: Heidelberg, Gotz, Grundl, Andreas
• Primary Examiner(s): Ro, Bentsu
• Application Number:
  US06/910,788
• Time in Patent Office: 644 Days
• Field of Search: 318/138, 318/254, 310/145, 310/185
• US Class Current: 318/400.41
• CPC Class Codes: H02K 29/06 with position sensing devices H02K29/03 takes precedence
• CPC Class Codes: H02K 29/08 using magnetic effect devices, e.g. Hall-plates, magneto-resistors H02K29/12 takes precedence
• CPC Class Codes: H02K 41/031 of the permanent magnet type

Abstract

A rotatory electromotor having a stator with stator poles and a rotor with rotor poles, permanent magnets being provided for the stator poles or for the rotor poles and electromagnets for the poles not provided with the permanent magnets, electronic switching means being provided for switching electromagnets in accordance with the relative positions of the electromagnets and permanent magnets in each case, and the permanent magnets and the electromagnets being arranged in such a way that only some of the electromagnets of the electromotor can be simultaneously switched in each case. Several adjacent electromagnets form a group of electromagnets belonging to one phase, this group cooperating with a number of permanent magnets located opposite, and adjacent groups of electromagnets belong to different phases.

Claims

1. A rotary electromotor having a stator with stator poles and a rotor with rotor poles, electromagnets operatively connected to the stator poles and permanent magnets operatively connected to the rotor poles, and electronic switching means operatively connected to the electromagnets for switching the electromagnets in dependency of the relative position of the stator and the rotor, the improvement comprising:

said stator poles being arranged in groups, with the pole distances between the stator poles belonging to a common group being substantially equal and substantially corresponding to the pole distance between the rotor poles;

said stator pole groups comprising end stator poles having no winding;

said switching means operatively connected to the groups of electromagnets for switching simultaneously the electromagnets within each group, and adjacent groups thereof at differing times.

2. An electromotor according to claim 1 wherein the stator pole groups have alternate stator poles having no windings.

3. An electromotor according to claim 2 wherein the stator pole groups each consist of three stator poles.

4. An electromotor according to claim 2 wherein the stator pole groups each consist of five stator poles.

5. An electromotor according to claim 1 wherein a plurality of electronic switching means is provided, each associated to one of the stator pole groups and controlled by a common means for detecting the relative position of the rotor poles to the stator pole group.

6. An electromotor according to claim 1 wherein the electronic switching means includes a plurality of electronic subswitching means per stator pole group, said plurality of electronic subswitching means being controlled by a common sensor means for detecting the relative position of the rotor poles to the stator pole group.

7. A rotary electromotor having a stator with stator poles and a rotor with rotor poles, electromagnets operatively connected to the stator poles and permanent magnets operatively connected to the rotor poles, and electronic switching means oepratively connected to the electromagnets for switching the electromagnets in dependency of the relative positions of the stator and the rotor, the improvement comprising:

said stator poles being arranged in groups, each group having a plurality of stator poles forming an electromagnetic circuit, with the pole distances between the stator poles belonging to a common group being substantially equal and substantially corresponding to the pole distances between the rotor poles;

said groups of electromagnets being spaced with respect to each other for forming transition points between the groups, the pole distance between the transition point forming electromagnets differing from the pole distance between the rotor poles;

said electronic switching means operatively connected to the groups of electromagnets for switching simultaneously the electromagnets within each group, and adjacent groups thereof at differing times;

said plurality of stator poles forming an electromagnetic circuit disconnected between groups at their transition points for disconnecting the electromagnetic circuit at the transition points thereby reducing substantially the disturbing reactions occurring between adjacent electromagnet groups being switched at different times; and

said stator pole groups having end stator poles with no windings.

8. An electromotor according to claim 7 wherein alternate stator poles within the stator pole groups have no windings.

9. An electromotor according to claim 8 wherein the stator pole groups each consist of three stator poles.

10. An electromotor according to claim 8 wherein the stator pole groups each consist of five stator poles.

11. A rotary electromotor having a stator with stator poles and a rotor with rotor poles, electromagnets operatively connected to the stator poles and permanent magnets operatively connected to the rotor poles, and electronic switching means operatively connected to the electromagnets for switching the electromagnets in dependency of the relative positions of the stator and the rotor, the improvement comprising:

said stator poles being arranged in groups, each group having a plurality of stator poles forming an electromagnetic circuit with the pole distances between the stator poles belonging to a common group being substantially equal and substantially corresponding to the pole distance between the rotor poles;

said groups of electromagnets being spaced with respect to each other for forming transition points between the groups, the pole distance between the transition point forming electromagnets differing from the pole distance between the rotor poles;

said electronic switching means operatively connected to the groups of electromagnets for switching simultaneously the electromagnets within each group, and adjacent groups thereof at differing times;

said plurality of stator poles forming an electromagnetic circuit disconnected between groups at their transition points for disconnecting the electromagnetic circuit at the transition points thereby reducing substantially the disturbing reactions occurring between adjacent electromagnet groups being switched at different times; and

said stator pole groups having end stator poles with less winding than the adjacent stator poles of the respective group.

12. A rotary electromotor having a stator with stator poles and a rotor with rotor poles, electromagnets operatively connected to the stator poles and permanent magnets operatively connected to the rotor poles, and electronic switching means operatively connected to the electromagnets for switching the electromagnets in dependency of the relative positions of the stator and the rotor, the improvement comprising:

said stator poles being arranged in groups, each group having a plurality of stator poles forming an electromagnetic circuit with the pole distances between the stator poles belonging to a common group being substantially equal and substantially corresponding to the pole distances between the rotor poles;

said groups of electromagnets being spaced with respect to each other for forming transition points between the groups, the pole distance between the transition point forming electromagnets differing from the pole distance between the rotor poles;

said electronic switching means operatively connected to the groups of electromagnets for switching simultaneously the electromagnets within each group, and adjacent groups thereof at differing times;

said plurality of stator poles forming an electromagnetic circuit disconnected between groups at their transition points for disconneting the electromagnetic circuit at the transition points thereby reducing substantially the disturbing reactions occurring between adjacent electromagnet groups being switched at different times; and

wherein the electronic switching means includes a plurality of electronic subswitching means per stator pole group, said plurality of electronic subswitching means being controlled by a common sensor means for detecting the relative position of the rotor poles to the stator pole group.

13. A rotary electromotor comprising:

a stator with stator poles and a rotor with rotor poles, electgromagnets and permanent magnets selectively connected to the stator and rotor poles;

switching means operatively connected to the electromagnets for switching the electromagnets in dependency of the relative positions of the stator and the rotor;

said stator poles being arranged in groups, each group having a plurality of stator poles forming an electrogmagnetic circuit, with the pole distances between the stator poles belonging to a common group being substantially equal and substantially corresponding to the pole distances between the rotor poles;

said groups of electromagnets being spaced with respect to each other for forming transition points between the groups, the pole distance between the transition point forming electromagnets differing from the pole distance between the rotor poles;

said switching means operatively connected to the groups of electromagnets for switching simultaneously the electromagnets within each group and adjacent groups thereof at differing times;

said plurality of poles forming the electromagnetic circuits being disconnected between groups at their transition points for disconnecting the electromagnetic circuit at the transition points; and

said group of poles forming the electromagnetic circuits having windings with end poles having less winding than the adjacent poles of the respective group.