Linear stepping motor
First Claim
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1. A linear stepping motor comprising:
- a stationary member and a movable member having mutually opposed faces;
a row of a plurality of teeth aligned with a determined pitch, said row being provided on said stationary member or movable member between said mutually opposed faces;
magnetic means comprising a driving-guiding magnetic pole, which is composed of a core member having plural pole pieces positioned at a predetermined pitch and having teeth opposed to the teeth of said row and a driving-guiding coil wound on said core member, and an attractive magnetic pole composed of a main flux coil wound on the core member adjacent to said driving-guiding magnetic pole, said magnetic means being fixed on a face opposed to the face bearing said row of teeth;
displacement detecting means for detecting a variation in the gap between said stationary and movable members;
first control means for controlling the attractive force generated by said coil between said stationary and movable members, in response to a detection signal from said detecting means, thereby regulating the gap between said stationary and movable members; and
second control means for controlling the magnetic field generated by said driving-guiding magnetic pole to drive and guide said movable member.
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Abstract
There is disclosed a linear stepping motor provided with a stationary member; a movable member having a face opposed to the stationary member; a first magnetic device for suspending the movable member in a floating state by magnetic attractive force with respect to the stationary member; a second magnetic device for magnetically displacing the movable member with respect to the stationary member; and a control device for controlling the first and second magnetic devices to determine the position of the movable member with respect to the stationary member.
33 Citations
7 Claims
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1. A linear stepping motor comprising:
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a stationary member and a movable member having mutually opposed faces; a row of a plurality of teeth aligned with a determined pitch, said row being provided on said stationary member or movable member between said mutually opposed faces; magnetic means comprising a driving-guiding magnetic pole, which is composed of a core member having plural pole pieces positioned at a predetermined pitch and having teeth opposed to the teeth of said row and a driving-guiding coil wound on said core member, and an attractive magnetic pole composed of a main flux coil wound on the core member adjacent to said driving-guiding magnetic pole, said magnetic means being fixed on a face opposed to the face bearing said row of teeth; displacement detecting means for detecting a variation in the gap between said stationary and movable members; first control means for controlling the attractive force generated by said coil between said stationary and movable members, in response to a detection signal from said detecting means, thereby regulating the gap between said stationary and movable members; and second control means for controlling the magnetic field generated by said driving-guiding magnetic pole to drive and guide said movable member. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A linear stepping motor comprising:
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an elongated stationary member having a plurality of teeth arranged at a pitch τ
transversely of a longitudinal direction of said stationary member;a movable member having first, second, third and fourth pole pieces arranged in the order named in said longitudinal direction of said stationary member, each of said pole pieces having a plurality of teeth opposed to said teeth of the stationary member and arranged at the pitch τ
, wherein said teeth of the second pole piece are located apart by lτ
+1/2τ
, those of the third pole piece are located apart by mτ
±
1/4τ
, and those of the fourth pole piece are located apart by nτ
±
1/4τ
, from the respective teeth of the first pole piece, in which l, m and n are integers;attraction magnetic pole means for maintaining said movable member floated by a magnetic coil providing an attractive force of a magnetic flux passing through a body of the movable member, between the first and the second pole pieces, a tooth portion of the stationary member, a body of the stationary member, between the third and the fourth pole pieces, and said body of the movable member; and guiding magnetic pole means comprising first, second, third and fourth magnetic coils wound on the first, the second, the third and the fourth pole pieces, respectively, said guiding magnetic pole means causing said movable member to move in said longitudinal direction of the stationary member by consecutive and selective energization of said first to fourth magnetic coils in a predetermined order such that the teeth of the pole piece on which the energized magnetic coil is wound align with the teeth of the stationary member.
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Specification