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.

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 motor controller estimates an initial position of a magnetic pole of a rotor of a brushless DC motor in an inductive sensing scheme. The motor controller controls a drive circuit to apply an AC voltage to a stator winding at a first energization angle, and subsequently to apply an AC voltage to the stator winding at a second energization angle before a residual current flowing through the stator winding returns to zero. At each energization angle, the motor controller corrects a peak value of a current in the stator winding based on the residual current detected immediately before a voltage is applied to the stator winding or at a time when voltage application to the stator winding is started. Based on the corrected peak value, the control circuit estimates the initial position of the magnetic pole of the rotor.

An electronic timepiece enables driving a motor in a reverse direction. The timepiece has a current detector detecting a current value flowing through a coil; a driver controller that outputs, according to the detected current value, a first drive signal turning the rotor in a forward direction to a position not pulled to a second statically stable position from a position where the rotor is pulled to a first statically stable position, outputs a second drive signal turning the rotor in a reverse direction past the dynamically stable position after outputting the first drive signal, and outputs a third drive signal turning the rotor in the reverse direction after outputting the second drive signal; and a driver that is controlled according to the first, second and third drive signals to an on state supplying drive current to the coil and an off state not supplying drive current to the coil.

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.

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 power seat system includes: a motor that changes a position of a power seat by performing a rotational operation; a Hall sensor that senses a change in Hall voltage according to the rotation of the motor and outputs a pulse signal; and a motor reverse rotation detection unit that monitors outputs from the motor and the Hall sensor, and detects an occurrence of a reverse pulse according to a motor reverse rotation when a motor current overshooting section and a change in pulse signal value are simultaneously detected in accordance with stop of the motor.

A power seat system includes: a motor that changes a position of a power seat by performing a rotational operation; a Hall sensor that senses a change in Hall voltage according to the rotation of the motor and outputs a pulse signal; and a motor reverse rotation detection unit that monitors outputs from the motor and the Hall sensor, and detects an occurrence of a reverse pulse according to a motor reverse rotation when a motor current overshooting section and a change in pulse signal value are simultaneously detected in accordance with stop of the motor.

An electronic timepiece enables driving a motor in a reverse direction. The electronic timepiece has a current detector that detects a current value flowing through a coil; a driver controller that outputs, according to the current value the current detector detected, a first drive signal causing the rotor to turn in a forward direction to a position not pulled to the second statically stable position from a position where the rotor is pulled to the first statically stable position, output, according to the current value the current detector detected, a second drive signal causing the rotor to turn in a reverse direction, which is opposite the forward direction, past the dynamically stable position after outputting the first drive signal, and output, according to the current value the current detector detected, a third drive signal causing the rotor to turn in the reverse direction after outputting the second drive signal; and a driver that is controlled, according to the first drive signal, the second drive signal, and the third drive signal, to an on state supplying drive current to the coil and an off state not supplying drive current to the coil.

A catheter procedure system includes a bedside system having a percutaneous device, at least one drive mechanism coupled to the percutaneous device and at least one motor coupled to the at least one drive mechanism. The system also includes a workstation that is coupled to the bedside system and includes a user interface and a controller coupled to the bedside system and the user interface. The controller is programmed to receive at last one parameter of the motor, determine a quadrature current of the motor based on at least the at least one parameter, determine a load torque on the motor based on at least the quadrature current, an angular velocity and an angular acceleration and control the operation of the motor based on the load torque, wherein the operation of the motor causes the drive mechanism to move the percutaneous device.