US4789815A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Linear motor
Assignee: Hi-Lex ACT Corp
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Filing: 1987-07-14
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Granted: 1988-12-06
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Expires: 2007-07-14
Abstract
Abstract A linear motor comprises a rail; a runner moved along the rail; a plurality of permanent magnets disposed in the rail along the longitudinal direction of the rail so as to alternately arrange the opposite polarities of the permanent magnets; coils disposed in the runner and arranged to oppose the permanent magnets; Hall elements disposed in the coils; and a control unit disposed in the runner and controlling an electric current supplied to the coils based on signals output from the Hall elements.
Inventors
- 👤 Fumio Kobayashi
- 👤 Kunio Sakai
- 👤 Jun Yamagashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:36
CPC Classifications
H; H02; H02K; H02K41/00; H02K41/02; H02K41/03; H02K41/031; B; B60; B60L; B60L13/00; B60L13/03; B60M; B60M1/00; B60M1/30; B60M1/302; B60L2200/00; B60L2200/26; E; E05; E05F; E05F15/00; E05F15/60
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
167 words
A linear motor comprising: a rail; runner means for moving along the rail; a plurality of permanent magnets disposed longitudinally in the rail so as to alternately arrange the opposite polarities of the permanent magnets; coil means disposed in the runner means and arranged for opposing said permanent magnets; Hall elements disposed in the runner means; control means disposed in the runner means and controlling an electric current supplied to the coil means based on signals output from the Hall elements; said coil means comprising a pair of coils, said Hall elements outputting signals for providing for the coils with polarities opposite the polarities of the permanent magnets adjacent the coils, and said control means comprising a control circuit for switching electric current supplied to the coils based on the signals from the Hall elements; and said control means further comprising exclusive NOR gates inputting the signals from the Hall elements and outputting signals for switching the electric current supplied to the coils to said control circuit.
Claim 2
Dependent Claim
167 words
A linear motor comprising: a rail; runner means for moving along the rail; a plurality of permanent magnets disposed longitudinally in the rail so as to alternately arrange the opposite polarities of the permanent magnets; coil means disposed in the runner means and arranged for opposing said permanent magnets; Hall elements disposed in the runner means; control means disposed in the runner means and controlling an electric current supplied to the coil means based on signals output from the Hall elements; said coil means comprising a pair of coils, said Hall elements outputting signals for providing for the coils with polarities opposite the polarities of the permanent magnets adjacent the coils, and said control means comprising a control circuit for switching electric current supplied to the coils based on the signals from the Hall elements; and said control means further comprising exclusive NOR gates inputting the signals from the Hall elements and outputting signals for switching the electric current supplied to the coils to said control circuit.
Claim 3
Dependent Claim
41 words
A linear motor as claimed in claim 1, wherein said rail has a wiring means for supplying the electric current to the coil means, and a current collecting brush attached to the runner means is disposed to contact the wiring means.
Claim 4
Dependent Claim
108 words
A linear motor comprising: a rail; runner means for moving along the rail means; a plurality of permanent magnets disposed in the rail along the longitudinal direction of the rail so as to alternately arrange the opposite polarities of the permanent magnets; coil means disposed in the runner means and arranged for opposing said permanent magnets; Hall elements disposed in the runner means; terminal means disposed in the runner means for supplying an electric current to the coil means; and control means disposed in the runner means for controlling electric current supplied through the terminal means to the coil means based on signals output from the Hall elements.
Claim 5
Dependent Claim
108 words
A linear motor comprising: a rail; runner means for moving along the rail means; a plurality of permanent magnets disposed in the rail along the longitudinal direction of the rail so as to alternately arrange the opposite polarities of the permanent magnets; coil means disposed in the runner means and arranged for opposing said permanent magnets; Hall elements disposed in the runner means; terminal means disposed in the runner means for supplying an electric current to the coil means; and control means disposed in the runner means for controlling electric current supplied through the terminal means to the coil means based on signals output from the Hall elements.
Claim 6
Dependent Claim
64 words
A linear motor as claimed in claim 3, wherein said coil means comprises a pair of coils, and said Hall elements output signals for providing for the coils polarities opposite the polarities of the permanent magnets adjacent the coils, and said control means comprises a control circuit for switching the electric current supplied to the coils based on the signals for the Hall elements.
Claim 7
Dependent Claim
22 words
A linear motor as claimed in claim 3, wherein said terminal means comprises a pair of terminals connected to an electric source.
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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) | 1991-12-06 | 1992-06-06 | 1992-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-12-06 | 1996-06-06 | 1996-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-12-06 | 2000-06-06 | 2000-12-06 | $7700.00 | Window Closed / Lapsed |