WO1998044615B1 - Electronically commutated pole-changing motor - Google Patents
Electronically commutated pole-changing motorInfo
- Publication number
- WO1998044615B1 WO1998044615B1 PCT/US1998/006136 US9806136W WO9844615B1 WO 1998044615 B1 WO1998044615 B1 WO 1998044615B1 US 9806136 W US9806136 W US 9806136W WO 9844615 B1 WO9844615 B1 WO 9844615B1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- rotor
- control circuit
- motor
- electric motor
- pole
- Prior art date
Links
- 239000004020 conductor Substances 0.000 claims abstract 4
- 230000000295 complement Effects 0.000 claims 1
Abstract
Methods and devices are provided for varying the number of poles on a rotor of an electrical motor by providing the rotor of the motor with a conductor control circuit which can control characteristics of the magnetic field generated by the rotor. Examples of modifiable characteristics include polarity, field distribution, and field strength.
Claims
1. An electric motor comprising
a rotor having
at least one electrical rotor conductor; and
a rotor control circuit;
wherein the rotor control circuit communicates at least one signal to the at least one rotor conductor to establish and control at least two magnetic poles;
wherein the total number of magnetic poles established can be varied among at least N values wherein N is at least 3.
2. The motor of claim 1 wherein any two adjacent magnetic poles have approximately equal magnitudes, but opposite polarities.
3. The motor of claim 1 wherein N is at least 6.
4. The motor of claim 1 wherein the rotor control circuit communicates the at least one signal to the at least one rotor conductor in response to a rotor input signal.
5. The motor of claim 1 further comprising a stator having a stator control circuit which is used to keep the current number of effective poles on the stator equal to the current number of effective poles on the rotor.
6. An electric motor comprising a rotor having
a rotor control circuit;
the rotor control circuit
positioned on the rotor and
capable of electronically altering the pole configuration of the rotor among at least N different configurations wherein N is at least 3 and each pole configuration has a different number of effective magnetic poles.
7. The electric motor of claim 7 wherein each pole has a coil associated with it and each coil has a switching circuit associated with it such that each switching circuit can change the polarity of the associated pole by reversing the direction of flow of a current through the coil.
8. The electric motor of claim 8 wherein each of the P switching circuits is configured as an H bridge.
9. The electric motor of claim 8 wherein each of the P switching circuits comprises a complementary pair of switching transistors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU67831/98A AU6783198A (en) | 1997-03-28 | 1998-03-27 | Electronically commutated pole-changing motor |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US4213097P | 1997-03-28 | 1997-03-28 | |
| US60/042,130 | 1997-03-28 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO1998044615A1 WO1998044615A1 (en) | 1998-10-08 |
| WO1998044615B1 true WO1998044615B1 (en) | 1998-11-26 |
Family
ID=21920203
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/US1998/006136 WO1998044615A1 (en) | 1997-03-28 | 1998-03-27 | Electronically commutated pole-changing motor |
Country Status (2)
| Country | Link |
|---|---|
| AU (1) | AU6783198A (en) |
| WO (1) | WO1998044615A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102011077456A1 (en) * | 2011-06-14 | 2012-12-20 | Siemens Aktiengesellschaft | Synchronous machine with HTS rotor |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| USRE18811E (en) * | 1929-06-21 | 1933-05-02 | Multispeed synchronous dynamo-electric machine | |
| US4477760A (en) * | 1983-03-24 | 1984-10-16 | Westinghouse Electric Corp. | Continuous pole amplitude modulated electric machines |
| IT1191814B (en) * | 1986-06-27 | 1988-03-23 | Brown Boveri Tecnomasio Ital | SWITCHING CIRCUIT OF THE NUMBER OF POLES ON THE SYNCHRONOUS MACHINE ROTOR USING ROTARY DIODES |
| US5736829A (en) * | 1994-08-02 | 1998-04-07 | Performance Controls, Inc. | High-speed constant-horsepower motor |
-
1998
- 1998-03-27 WO PCT/US1998/006136 patent/WO1998044615A1/en active Application Filing
- 1998-03-27 AU AU67831/98A patent/AU6783198A/en not_active Abandoned
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