A method for obtaining an initial mechanical angle of an electric motor includes determining a mechanical state of the electric motor, determining an initial electrical angle of the electric motor according to the mechanical state, and determining the initial mechanical angle of the electric motor according to the initial electrical angle.

A motor driving control device includes an induced voltage detecting unit configured to detect an induced voltage of a motor, a controller for generating a PWM signal, and an inverter circuit for outputting a driving signal to the motor based on the PWM signal. The controller is configured to detect a position detection signal, to measure a zero-cross point of the induced voltage of the motor based on a detected timing of an edge of the position detection signal, to stop output of the driving signal only for a predetermined period containing the zero-cross point of the induced voltage, to measure a pulse width of a regenerated voltage in the period, to calculate a zero-cross point of coil current based on the measurement result, and to adjust the energization timing based on the calculation result. The predetermined period is a period of one cycle of the PWM signal.

A homing mechanism within a drive mechanism of a lacing engine for an automated footwear platform can include an indexing wheel, a plurality of Geneva teeth and a stop tooth. The plurality of Geneva teeth can be distributed around a portion of a perimeter of the indexing wheel. Each Geneva tooth of the plurality of Geneva teeth can include side profiles conforming to a first side profile that generates a first force when engaged by an index tooth on a portion of the drive mechanism. The stop tooth can be located along the perimeter of the indexing wheel between two Geneva teeth. Additionally, the stop tooth can include side profiles conforming to a second side profile that generates a second force when engaged by the index tooth.

A motor module includes a motor including a commutator, and an apparatus that is attached to the motor and obtains information on rotation of the motor. The apparatus includes a rotation angle calculator that calculates a rotation angle of the motor based on a voltage between terminals of the motor and an electric current flowing through the motor, a first signal generator that generates a first signal based on a ripple component included in the electric current flowing through the motor, a second signal generator that generates a second signal indicating that the motor has rotated by a predetermined angle based on the first signal and the rotation angle, and a rotation information calculator that calculates the information on the rotation of the motor based on an output from the second signal generator.

A wiper system including a brushless DC electric motor having a rotor, a stator having coils for electromagnetically exciting the rotor, a device for determining the angular position of the rotor with respect to the stator, a control unit configured to generate control signals for supplying power to the electromagnetic excitation coils according to the angular position of the rotor determined by the device for determining the angular position of the rotor, a reduction gear mechanism linked, on one side, to the rotor of the electric motor and, on the other side, to an output shaft that is intended to be linked to an external mechanism. The rotor includes at least one Hall effect sensor associated with a control magnet that rotates with the rotor and the gear motor also having a processing unit connected to the device for determining the angular position of the rotor.

According to the present invention, in position sensorless control for switching between a 120-degree energization scheme for a low-speed region and a 180-degree energization scheme for a mid-to-high-speed region, stable and highly accurate speed control characteristics are provided by suppressing speed deviation r in the low-speed region, and by preventing current jump-up caused by a discontinuous rotational speed occurring during switching to the mid-to-high-speed region. In the case of driving in the 120-degree energization scheme, a voltage command value is corrected such that an estimated speed value or a detected speed value follows a speed command.

A motor controller includes current measurement circuitry and estimation circuitry. The current measurement circuitry is adapted to be coupled to a motor, and configured to measure current in the motor. The estimation circuitry is coupled to the current measurement circuitry, and includes a memory, current computation circuitry, and summation circuitry. The memory stores coefficients of a function for estimating current related to variation of inductance of the motor. The current computation circuitry is coupled to the memory, and is configured to compute a compensation current value based on the coefficients. The summation circuitry is coupled to the current compensation circuitry, and is configured to generate a position error signal by subtracting the compensation current value from a measured current value generated by the current measurement circuitry.

A method and apparatus for quasi-sensorless adaptive control of a high rotor pole switched-reluctance motor (HRSRM). The method comprises the steps of: applying a voltage pulse to an inactive phase winding and measuring current response in each inactive winding. Motor index pulses are used for speed calculation and to establish a time base. Slope of the current is continuously monitored which allows the shaft speed to be updated multiple times and to track any change in speed and fix the dwell angle based on the shaft speed. The apparatus for quasi-sensorless control of a high rotor pole switched-reluctance motor (HRSRM) comprises a switched-reluctance motor having a stator and a rotor, a three-phase inverter controlled by a processor connected to the switched-reluctance motor, a load and a converter.

A robust starting system and method for an interior permanent magnet synchronous motor, suitable for commercial fan and blower drive applications. A comprehensive starting control process is provided that utilizes control flags to implement closed-loop control accounting for any pre-existing rotor movement, controlling the motor speed from an initial speed to a destination speed. A universal dqController provides selective configurability for collecting information regarding the initial state of the motor, as well as starting and operational motor control. Dynamic high frequency injection enables the use of HFI outside the normal standstill motor speeds by intelligently decoupling the high frequency and rotor movement portions of the stator current response.

A method for determining an error in the angular position measurement of a timepiece motor having one or more phases, including: detecting (3) each instant (14) when the value of one of the back electromotive forces is zero, storing (4) a time corresponding to each detected instant, measuring (5) several time intervals between two instants (14) detected in the same revolution of the motor, comparing (6) the measured time intervals to reference time intervals to deduce the reference intervals to which they correspond, and determining (7) an angular position measurement error if the measured intervals do not correspond to the expected reference intervals. The invention also relates to a method for correcting the angular position measurement. Also, a determination and correction system for implementing the methods and a timepiece including such a system.