Aspects of the invention provide methods and systems for moving a plurality of moveable stages relative to a stator. The stator comprises a plurality of coils shaped to provide pluralities of coil trace groups where each coil trace group comprises a corresponding plurality of generally linearly elongated coil traces which extend across a stator tile. Each moveable stage comprises a plurality of magnet arrays. Methods and apparatus are provided for moving the moveable stages relative to the stator, where a magnet array from a first moveable stage and a magnet array from a second moveable stage both overlap a shared group of coil traces. For at least a portion of the time that the magnet arrays from the first and second moveable stages overlap the shared group of coil traces, currents are controllably driven in the shared coil trace group based on the positions of both the first and second moveable stages. The positions of the first and second moveable stages may be ascertained by feedback.

A temperature acquisition section (acquisition module) acquires a temperature of an environment in which a printer device is used. A printing condition acquisition section (acquisition module) acquires information relating to printing conditions of the printer device. A conveyance load estimation section (estimation module) estimates a conveyance load when a stepping motor (motor) provided in the printer device conveys a printing paper (print medium) based on the information acquired by the temperature acquisition section and the printing condition acquisition section. A current value setting section (setting module) sets a current value to be applied to the stepping motor based on the conveyance load estimated by the conveyance load estimation section. A motor control section (control module) controls the stepping motor by applying the current value set by the current value setting section to the stepping motor.

A stepper driver for a motor includes an H-bridge, a sense transistor coupled to the H-bridge, a voltage-to-current (Vtol) converter, and a sine digital-to-analog converter (DAC). The Vtol converter has a Vtol converter input and a Vtol converter output. The Vtol converter output is coupled to the sense transistor. The sine DAC has a sine DAC digital input, a reference input, and a sine DAC output. The sine DAC output is coupled to the Vtol converter input. The sine DAC includes an R-2R network, an offset control circuit coupled to the R-2R network, and a gain control circuit also coupled to the R-2R network.

A method for preventing collisions when driving at least two movers on a drive surface, each mover comprising at least one magnetic field generator, with a device comprising a plurality of plate-shaped sectors, the sectors each comprising at least one electric magnetic field generator. The sectors form the drive surface, generating magnetic fields via control of a power supply of the electric magnetic field generators such that the movers are movable over the drive surface in at least one direction. A first path planning for the first mover is carried out, an estimated second travel path of the second mover is determined or received, and the estimated second travel path of the second mover is taken into account in the first path planning of the first mover to determine a first travel path for the first mover such that collision of the first mover with the second mover is prevented.

Systems and methods are disclosed and include a needle control module that includes a processor configured to execute instructions stored in a nontransitory computer-readable medium, a motor driver circuit in communication with the needle control module, the motor driver circuit controlling a stepper motor attached to a needle, and a housing enclosing the needle control module, the motor driver circuit, and the stepper motor, the housing being physically attached to a display of a vehicle. In response to the needle control module receiving a signal representing vehicle state information, the needle control module is configured to instruct the motor driver circuit to control movement of the stepper motor and adjust a position of the needle based on the signal.

A method for controlling a polyphase actuator includes supplying each phase with a periodically varying voltage having a periodic sequence of steps P.sub.i that have a constant duration and an amplitude A.sub.n,i, where n corresponds to the rank of the phase and i to the rank of the step. The method further includes determining a target position PC.sub.i of a rotor of the actuator, in order to define a sinusoidal voltage envelope. The actuator further includes a movable member, a stator equipped with electrical coils and a sensor detecting the mechanical position of the movable member with respect to the stator, as well as a microcontroller. The microcontroller determines, at times T.sub.capteur, a mechanical position of a mechanical member, the microcontroller calculates, at each of the times T.sub.capteur, a difference between the mechanical position and a target position PC.sub.i corresponding to the step P.sub.i and the microcontroller calculates a coefficient k as a function of the difference. The microcontroller also weights the amplitude of a power supply applied to the phases by a coefficient k in order to supply the phases with weighted amplitude voltages A.sub.n,i*k.

A stepper motor driver for mechanical engineering mechanical engineering includes a bottom plate, and a placing slot formed on the upper surface of the bottom plate. Both sides of the inner wall of the placing slot inner wall are fixed by a first sliding rod; two first sliding sleeves are sheathed on a surface of the first sliding rod; two first sliding sleeves are engaged with opposite sides of the two first fixed plates respectively; two first springs are sheathed on the first sliding rod, and both ends of two first springs are fixed to the sides of the two first fixed plates away from each other and both sides of the inner wall of the placing slot respectively. The driver can be removed and replaced conveniently and quickly to achieve the effects of reducing the labor intensity, saving the working time, and improving the efficiency of replacing the driver, with the design of the first fixed plate, first spring, carrier board, third fixed plate, telescopic device and clamping plate.

A stepper motor driver for mechanical engineering mechanical engineering includes a bottom plate, and a placing slot formed on the upper surface of the bottom plate. Both sides of the inner wall of the placing slot inner wall are fixed by a first sliding rod; two first sliding sleeves are sheathed on a surface of the first sliding rod; two first sliding sleeves are engaged with opposite sides of the two first fixed plates respectively; two first springs are sheathed on the first sliding rod, and both ends of two first springs are fixed to the sides of the two first fixed plates away from each other and both sides of the inner wall of the placing slot respectively. The driver can be removed and replaced conveniently and quickly to achieve the effects of reducing the labor intensity, saving the working time, and improving the efficiency of replacing the driver, with the design of the first fixed plate, first spring, carrier board, third fixed plate, telescopic device and clamping plate.

Aspects of the invention provide methods and systems for moving a plurality of moveable stages relative to a stator. The stator comprises a plurality of coils shaped to provide pluralities of coil trace groups where each coil trace group comprises a corresponding plurality of generally linearly elongated coil traces which extend across a stator tile. Each moveable stage comprises a plurality of magnet arrays. Methods and apparatus are provided for moving the moveable stages relative to the stator, where a magnet array from a first moveable stage and a magnet array from a second moveable stage both overlap a shared group of coil traces. For at least a portion of the time that the magnet arrays from the first and second moveable stages overlap the shared group of coil traces, currents are controllably driven in the shared coil trace group based on the positions of both the first and second moveable stages. The positions of the first and second moveable stages may be ascertained by feedback.

Aspects of the invention provide methods and systems for moving a plurality of moveable stages relative to a stator. The stator comprises a plurality of coils shaped to provide pluralities of coil trace groups where each coil trace group comprises a corresponding plurality of generally linearly elongated coil traces which extend across a stator tile. Each moveable stage comprises a plurality of magnet arrays. Methods and apparatus are provided for moving the moveable stages relative to the stator, where a magnet array from a first moveable stage and a magnet array from a second moveable stage both overlap a shared group of coil traces. For at least a portion of the time that the magnet arrays from the first and second moveable stages overlap the shared group of coil traces, currents are controllably driven in the shared coil trace group based on the positions of both the first and second moveable stages. The positions of the first and second moveable stages may be ascertained by feedback.