IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
UP-0959213
(2007-12-18)
|
등록번호 |
US-7764030
(2010-08-13)
|
우선권정보 |
JP-P2007-169032(2007-06-27) |
발명자
/ 주소 |
- Miyajima, Masayasu
- Suzumura, Jun
- Oonishi, Toshiyuki
- Ohata, Katsumi
|
출원인 / 주소 |
- Mitsubishi Electric Corporation
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
1 인용 특허 :
11 |
초록
▼
A control apparatus for a three-phase brushless motor, in which a control circuit includes time interval calculation means (133 in FIG. 4). The time interval calculation means (133) is endowed with at least one time interval calculation mode. In the time interval calculation mode, pluralities of tim
A control apparatus for a three-phase brushless motor, in which a control circuit includes time interval calculation means (133 in FIG. 4). The time interval calculation means (133) is endowed with at least one time interval calculation mode. In the time interval calculation mode, pluralities of time intervals which correspond to an addition section obtained by adding up two or more Q continuous sections are calculated on the basis of two position detection signals which lie at both the ends of the addition section, among position detection signals successively generated. The control circuit determines pluralities of energization switching timings on the basis of the pluralities of time intervals. The control apparatus for the three-phase brushless motor can decrease the deviations of the energization switching timings attributed to the errors of the mounting positions of position sensors or to the errors of the magnetized positions of a rotor, without requiring any complicated adjustment.
대표청구항
▼
What is claimed is: 1. A control device for a three-phase brushless motor, comprising: the three-phase brushless motor in which a plurality of stator coils are arranged around a rotor; a switch circuit which changes-over energizations for the respective stator coils; a position detection signal gen
What is claimed is: 1. A control device for a three-phase brushless motor, comprising: the three-phase brushless motor in which a plurality of stator coils are arranged around a rotor; a switch circuit which changes-over energizations for the respective stator coils; a position detection signal generation device which comprises at least three position sensors and which successively generates position detection signals in correspondence with rotational positions of the rotor; and a control circuit which receives the position detection signals and which calculates a plurality of energization switching timings for the respective stator coils, so as to control said switch circuit, wherein: the position detection signals are successively generated from the at least three sensors, where the position detection signals have sections in between, where each of the sections is an angular interval between two adjacent position detection signals; said control circuit comprises a time interval calculation module which calculates, in a one time interval calculation mode, a plurality of time intervals based on at least two of the position detection signals separated by an addition section obtained by adding at least two contiguous sections; and said control circuit determines the plurality of energization switching timings based on the calculated plurality of time intervals. 2. The control device for the three-phase brushless motor as defined in claim 1, wherein said three-phase brushless motor has the stator coils numbering N, around the rotor, and the addition section is obtained by adding between 2 and 2 N of said contiguous sections. 3. The control device for the three-phase brushless motor as defined in claim 1, wherein in the one-time interval calculation mode, said time interval calculation module calculates the pluralities of time intervals based on two position detection signals which correspond to magnetic flux changes having identical polarities. 4. The control device for the three-phase brushless motor as defined in claim 1, wherein in the one-time interval calculation mode, said time interval calculation module calculates the plurality of time intervals based on another two position detection signals obtained from the same position sensor. 5. The control device for the three-phase brushless motor as defined in claim 1, wherein the time interval calculation module, in another time interval calculation mode different from the one-time interval calculation mode, calculates another plurality of time intervals based on two position detection signals at either end of one section, and said control circuit determines the plurality of energization switching timings based on the another plurality of time intervals. 6. The control device for the three-phase brushless motor as defined in claim 5, wherein said control circuit switches between a first state where said time interval calculation module operates in the one-time interval calculation mode and a second state where said time interval calculation module operates in the another time interval calculation mode, based on a change of magnitude of a rotational speed command for said three-phase brushless motor. 7. The control device for the three-phase brushless motor as defined in claim 5, wherein said control circuit switches between a first state where said time interval calculation module operates in the one-time interval calculation mode and a second state where said time interval calculation module operates in the another time interval calculation mode, based on difference between a rotational speed command for said three-phase brushless motor and an actual rotational speed of said three-phase brushless motor. 8. The control device for the three-phase brushless motor as defined in claim 5, wherein said control circuit switches between a first state where said time interval calculation module operates in the one-time interval calculation mode, and a second state where said time interval calculation module operates in the another time interval calculation mode, based on a change of an average load current of said three-phase brushless motor. 9. The control device for the three-phase brushless motor as defined in claim 1, wherein: at least first two of the plurality of time intervals are calculated based on two position detection signals obtained at an up-slope and at least second two of the plurality of time intervals are calculated based on another two position detection signals obtained at a down slope, the up-slope is when magnetic flux density rises onto N-pole side of edges and wherein the down-slope is when the magnetic flux density lowers onto S-pole side of edges, and the edges are formed between adjacent permanent magnets. 10. The control device for the three-phase brushless motor as defined in claim 9, wherein the first two time intervals are even time intervals and the second two time intervals are odd time intervals. 11. The control device for the three-phase brushless motor as defined in claim 1, wherein the plurality of energization switching timings fluctuates less than 10 degrees. 12. The control device for the three-phase brushless motor as defined in claim 1, wherein said control circuit switches between a first state where said time interval calculation module receives the one-time interval calculation mode in which the addition section is obtained by adding a first predetermined number of contiguous sections and a second state where said time interval calculation module receives another time interval calculation mode in which the addition section is obtained by adding a different number of contiguous sections from the first predetermined number of contiguous sections. 13. A control device for a three-phase brushless motor, comprising: the three-phase brushless motor in which a plurality of stator coils are arranged around a rotor; a switch circuit which changes-over energizations for the respective stator coils; at least three position sensors which generate position detection signals in correspondence with rotation of the rotor, where the position detection signals are generated from the at least three position sensors, the position detection signals are separated by sections, where each of the sections is an angular interval between two adjacent position detection signals; and a control circuit which, calculates, in a one-time interval calculation mode, a plurality of time intervals based on at least two position detection signals separated by an addition section obtained by adding at least two contiguous sections; and which determines a plurality of energization switching timings for the respective stator coils based on the calculated plurality of time intervals.
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