Patent US5317242A successfully refreshed from Google Patents.
US5317242A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Motor-driving circuit and wire-bonding apparatus
Assignee: Toshiba Corp
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Filing: 1991-11-15
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Granted: 1994-05-31
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Expires: 2011-11-15
Abstract
Abstract A motor-driving circuit is used for driving a motor which is of a type including a rotor whose rotating shaft has a permanent magnet used for generating magnetic flux, and an armature having three-phase windings wound around an iron core to form Y-connection windings. The motor-driving circuit includes a circuit for short-circuiting two of the three leads extending from the Y-connection windings, a rotational position detector for detecting a rotational position of the motor, and a control circuit for causing an exciting an exciting current to flow between the short-circuited leads and the remaining lead, in such a manner that the rotational position detected by the rotational position-detecting means is moved to a designated rotational position which is corresponding to an external input which is within a narrow angular range.
Inventors
- 👤 Noriyasu Kashima
- 👤 Mutsumi Suematsu
- 👤 Kazumi Ohtani
- 👤 Koichiro Atsumi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:21
CPC Classifications
H; H10; H10W; H10W72/00; H10W72/071; H10W72/075; H02; H02P; H02P6/00; H02P6/24; H10W72/0711; H10W72/50; H10W72/07141; H10W72/07173; H10W72/07521; H10W72/07531; H10W72/07532; H10W72/07533; H10W72/531; H10W72/536; H10W72/5363; H10W72/551; H10W72/552; H10W90/00; H10W90/701; H10W90/751; H10W90/756
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
155 words
A motor-driving circuit for driving a motor including; a rotor having a rotatable shaft with a permanent magnet attached thereto for generating magnetic flux; and a stator including an iron core, three-phase windings wound around their on core to form Y-connection windings, and three leads connected to and extending from the windings; said motor-driving circuit comprising: short-circuiting means for short-circuiting two of the three leads to each other; rotational position-detecting means for detecting a rotational position of the motor and outputting current position information; and control means for supplying an exciting current to the short-circuit leads and the remaining lead to control the shaft of the rotor to move to a designated rotational position within a narrow angular range, said exciting current having a value corresponding to a difference between the current position information from the rotational position-detecting means and externally input positional information which represents the designated rotational position within the narrow angular range.
Claim 2
Dependent Claim
155 words
A motor-driving circuit for driving a motor including; a rotor having a rotatable shaft with a permanent magnet attached thereto for generating magnetic flux; and a stator including an iron core, three-phase windings wound around their on core to form Y-connection windings, and three leads connected to and extending from the windings; said motor-driving circuit comprising: short-circuiting means for short-circuiting two of the three leads to each other; rotational position-detecting means for detecting a rotational position of the motor and outputting current position information; and control means for supplying an exciting current to the short-circuit leads and the remaining lead to control the shaft of the rotor to move to a designated rotational position within a narrow angular range, said exciting current having a value corresponding to a difference between the current position information from the rotational position-detecting means and externally input positional information which represents the designated rotational position within the narrow angular range.
Claim 3
Dependent Claim
20 words
A motor-driving circuit according to claim 1, wherein said short-circuiting means includes a short-circuiting line for short-circuiting the two leads.
Claim 4
Dependent Claim
23 words
A motor-driving circuit according to claim 1, wherein said rotational position-detecting means includes a rotary encoder coupled to the shaft of the motor.
Claim 5
Dependent Claim
22 words
A motor-driving circuit according to claim 1, wherein said rotational position-detecting means includes a resolver coupled to the shaft of the motor.
Claim 6
Dependent Claim
131 words
A motor-driving circuit according to claim 1, wherein said control means comprises: position control means for comparing the externally input positional information with the current position information from the rotational position-detecting means, and for outputting a reference signal corresponding to a difference between the current position information and the designated rotational position; position-to-speed conversion means for converting the current position information from the rotational position-detecting means into a speed signal; speed control means for comparing the reference signal output form the position control means with the speed signal obtained by the position-to-speed conversion means, and for outputting a current signal and the speed signal; and current control means for supplying the motor with a d.c. exciting current having a value corresponding to the current signal output by the speed control means.
Claim 7
Dependent Claim
28 words
A motor-driving circuit according to claim 1, wherein said control means receives positional information representing a position which is within the narrow angular range of 0° to ±5°.
Claim 8
Dependent Claim
28 words
A motor-driving circuit according to claim 1, wherein said motor is rotated within the narrow angular range of 0° to ±5° under the control of said control means.
Claim 9
Dependent Claim
136 words
A motor-driving circuit for driving a motor including; a rotor having a rotatable shaft with a permanent magnet attached thereto and used for generating magnetic flux; a stator including an iron core, three-phase windings wound around the iron core to form Δ-connection windings, and three leads connected to and extending from the windings; said motor-driving circuit comprising: rotational position-detecting means for detecting a rotational position of the motor and outputting current position information; and control means connected to only two of the three leads for supplying an exciting current to the Δ-connection windings via the two of the three leads, said exciting current having a value corresponding to a difference between the current position information from the rotational position-detecting means and externally input positional information representing a designated rotational position located within a narrow angular range.
Claim 10
Dependent Claim
136 words
A motor-driving circuit for driving a motor including; a rotor having a rotatable shaft with a permanent magnet attached thereto and used for generating magnetic flux; a stator including an iron core, three-phase windings wound around the iron core to form Δ-connection windings, and three leads connected to and extending from the windings; said motor-driving circuit comprising: rotational position-detecting means for detecting a rotational position of the motor and outputting current position information; and control means connected to only two of the three leads for supplying an exciting current to the Δ-connection windings via the two of the three leads, said exciting current having a value corresponding to a difference between the current position information from the rotational position-detecting means and externally input positional information representing a designated rotational position located within a narrow angular range.
Claim 11
Dependent Claim
23 words
A motor-driving circuit according to claim 8, wherein said rotational position-detecting means includes a rotary encoder coupled to the shaft of the motor.
Claim 12
Dependent Claim
22 words
A motor-driving circuit according to claim 8, wherein said rotational position-detecting means includes a resolver coupled to the shaft of the motor.
Claim 13
Dependent Claim
139 words
A motor-driving circuit according to claim 8, wherein said control means comprises: position control means for comparing the externally input positional information with the current position information form the rotational position-detecting means, and for outputting a reference signal corresponding to a difference between the current position information and the designated rotational position; position-to-speed conversion means for converting the current position information from the rotational position-detecting means into a speed signal; speed control means for comparing the reference signal output from the position control means with the speed signal obtained by the position-to-speed conversion means, and for outputting a current signal corresponding to a difference between the reference signal and the speed signal; and current control means for supplying the motor with a d.c. exciting current having a value corresponding to the current signal output by the speed control means.
Claim 14
Dependent Claim
28 words
A motor-driving circuit according to claim 8, wherein said control means receives positional information representing a position which is within the narrow angular range of 0° to ±5°.
Claim 15
Dependent Claim
28 words
A motor-driving circuit according to claim 8, wherein said motor is rotated within the narrow angular range of 0° to ±5° under the control of said control means.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-05-30 | 1997-11-29 | 1998-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-05-30 | 2001-11-29 | 2002-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-05-30 | 2005-11-29 | 2006-05-31 | $7700.00 | Window Closed / Lapsed |