An embodiment of a linear electric machine includes two or more phases that define a central bore, and alternating permanent magnets that are disposed within the central bore and are free to move relative the windings. An embodiment of a method for selectively powering the windings is disclosed that enables the machine to realize a commanded force, or to determine the force present by using the current within the windings and the alignment of the magnets relative to the windings.

A linear drive system adapted for repetitive driving using a linear motor. The drive system may be used to power pumping hydrofoils which drive a boat or ship. Linkages are used to maintain the driven portion in linear motion. A coupled dual drive system in which two driven portions are coupled such that their coupled motions travel at the same velocity in opposed directions. The coupled linear drive system which may be used as a mechanical power source for drive systems used in transportation and industry. A boat with dual pumping hydrofoils adapted for propel a boat using the hydrofoils for both lift and propulsion.

A method for determining an air gap between a transport rotor and a stator segment, wherein an acceleration run of the transport rotor is performed and, here, the present stator current is measured and actual speed values are determined, from which a change in speed per time unit is determined, and from which an acceleration is determined, where the present propulsion force is determined from the product of the force constant and the present stator current, where the present propulsion force and the acceleration are used to determine a virtual mass of the transport rotor, and where for a statement about the currently prevailing air gap a relationship between an increase in the virtual mass and an enlargement of the air gap is used and a size value for the air gap is calculated therefrom.

The invention relates to a linear motor system, in particular a transport system, e.g. a multicarrier, comprising: a guide track having a plurality of electromagnets that are arranged distributed along the guide track and that are supplied with electrical energy from a power supply network; at least one carrier that is guided at and movable along the guide track and that comprises a drive magnet for cooperating with the electromagnets of the guide track to move the carrier; and a control device for controlling the movement of the carrier relative to the guide track by energizing some of the electromagnets by means of a drive current, characterized in that the control device is configured to energize at least some of the electromagnets with a damping current such that the energizing with the damping current results, on the one hand, in no additional movement and/or no change in the movement of the carrier along the guide track generated by the drive current and/or, on the other hand, in no additional force on the carrier and/or no change in the force on the carrier generated by the drive current, in particular along the guide track, wherein the energizing with the damping current is performed to reduce oscillations and/or current and voltage fluctuations in the power supply network.

The disclosure uses the Carter's coefficient to correct the equivalent electromagnetic air gap length. And the specific permeance on both sides of the primary core is obtained. Then, the permeance on both sides based on the structure of the primary core is calculated. An equation is established by using the continuity principle of flux, thereby obtaining the air gap magnetomotive force model of current-carrying conductor. The slot vector diagram of magnetomotive force in short primary linear machine is illustrated according to that in the rotating machine. Then, based on the winding arrangement and vector combination, the amplitude and phase of various spatial harmonic wave of the three-phase winding are obtained. Finally, the characteristics of average component distribution of the current-carrying conductor are adopted to obtain the pulsating magnetomotive force generated by the three-phase winding of the linear machine.

The present technology relates to an imaging device and an electronic device that enable highly accurate adjustment of a focus position and a camera shake correction position. The device includes: a lens that focuses subject light; an imaging element that photoelectrically converts the subject light from the lens; a circuit substrate including a circuit that externally outputs a signal from the imaging element; an actuator that drives the lens with a Pulse Width Modulation (PWM) waveform in at least one of an X-axis direction, a Y-axis direction, or a Z-axis direction; and a detection unit that detects a magnetic field generated by a coil included in the actuator. The actuator drives the lens to move a focus, or drives the lens to reduce an influence of camera shake. The present technology can be applied to the imaging device.

There is provided a transport system comprising: a stator having a first magnetic force unit; a mover having a second magnetic force unit; and a control unit. The control unit controls a magnetic force acting between the first magnetic force unit and the second magnetic force unit to transport the mover in a first direction. The stator has a first regulating member row including a plurality of first regulating members and a second regulating member row including a plurality of second regulating members, the mover, in a second direction intersecting the first direction, being disposed between the first regulating member row and the second regulating member row. The control unit performs a first process of applying a rotational force to the mover such that one of the first regulating members in the first regulating member row serves as a fulcrum when the mover contacts the first regulating member row.

Abstract: In some aspects, a controller may obtain a back electromotive force (BEMF) signal associated with a haptic feedback component, wherein the BEMF signal is generated by movement of the haptic feedback component. The controller may determine a time length for the BEMF signal to cross an amplitude-based window. The controller may determine, based on the time length, a braking amplitude for a control signal to reduce an energy level of the haptic feedback component. The controller may control the control signal according to the braking amplitude. Numerous other aspects are provided.

A system and method for monitoring disturbance forces experienced by a mover in an independent cart system monitors current generated by a controller and a feedback signal corresponding to operation of the mover in response to the current generated by the controller. The controller stores a value of the current reference and of the feedback signal, sampled in tandem, and determines a disturbance force experienced by the mover as it travels along the track as a function of the stored values of the current reference and of the feedback signal. The controller may store the measured disturbance force experienced by the mover as a function of the location of the mover along the track. For each subsequent time the mover travels along the same length of track, the controller may add a compensation value to the current reference to reduce the disturbance force experienced by the mover.

Systems and methods are provided for braking a translator of a linear multiphase electromagnetic machine. The system detects a fault event. A polarity indicative of an electromotive force in determined in at least one phase of the linear multiphase electromagnetic machine caused by a motion of the translator. In response to detecting the fault event, the system causes, based on the polarity, a current to be applied to a respective phase of the at least one phase to cause a force acting on the translator that opposes an axial motion of the translator to cause the translator to brake. Braking includes causing the translator to reciprocate at a reduced velocity by opposing axial motion over one or more cycles. The system may use one or more of position information, current information, operating parameters, to brake, or may brake the translator independent of such information.