초록 ▼

Leakage of magnetic fluxes passing through the gaps between the magnetic pole teeth of an armature is reduced thereby to reduce a magnetic attraction force between the armature and a mover. A linear motor includes a first member and a second member. The first member is configured with at least a mag

Leakage of magnetic fluxes passing through the gaps between the magnetic pole teeth of an armature is reduced thereby to reduce a magnetic attraction force between the armature and a mover. A linear motor includes a first member and a second member. The first member is configured with at least a magnetic pole of a first polarity having a first opposed portion and a magnetic pole of a second polarity having a second opposed portion. The second member is held by the first opposed portion, while the second member is held by the second opposed portion and moves relatively. The first member is formed of an iron core and a winding, and the second member is formed of a permanent magnet, a magnetic material, a winding of a single type or a combination of a plurality of types of materials.

대표청구항 ▼

Leakage of magnetic fluxes passing through the gaps between the magnetic pole teeth of an armature is reduced thereby to reduce a magnetic attraction force between the armature and a mover. A linear motor includes a first member and a second member. The first member is configured with at least a mag

Leakage of magnetic fluxes passing through the gaps between the magnetic pole teeth of an armature is reduced thereby to reduce a magnetic attraction force between the armature and a mover. A linear motor includes a first member and a second member. The first member is configured with at least a magnetic pole of a first polarity having a first opposed portion and a magnetic pole of a second polarity having a second opposed portion. The second member is held by the first opposed portion, while the second member is held by the second opposed portion and moves relatively. The first member is formed of an iron core and a winding, and the second member is formed of a permanent magnet, a magnetic material, a winding of a single type or a combination of a plurality of types of materials. uenced by a belt tongue inserted into a buckle. 4. The circuit arrangement according to claim 3, wherein: the magnetic-field-sensitive element includes a Hall element. 5. The circuit arrangement according to claim 3, further comprising: a capacitor arranged between the first line and the second line and connected in series to the parallel circuit, wherein: the capacitor receives from the control unit a charging current, the capacitor charges and discharges cyclically, and a discharge current of the capacitor flows through the magnetic-field-sensitive element so that, in a phase, the magnetic-field-sensitive element generates the control voltage with a magnitude capable of closing the controllable switch, and that, during a charging operation following a discharge of the capacitor, the controllable switch remains open due to an insufficient magnitude for the control voltage from the magnetic-field-sensitive element. 6. The circuit arrangement according to claim 5, wherein: the control unit detects a belt operation from a first pulse duty factor of opening and closing the controllable switch, and the first pulse duty factor, when the belt tongue is snapped in the buckle, is distinguished from another pulse duty factor when the belt tongue is not snapped in the buckle. 7. The circuit arrangement according to claim 5, wherein: the control unit detects a belt operation from a current on the first line and the second line, the current on the first line and the second line is stronger when the belt tongue is snapped in the buckle than when the belt tongue is not snapped in the buckle, and the control unit measures the current on the first line and the second line during an open phase of the controllable switch. 8. The circuit arrangement according to claim 5, wherein: the control unit performs a diagnosis of the firing element during a closed phase of the controllable switch.