The present invention relates to an inverter-controlling device. The inverter-controlling device include a main controller configured to generate a predetermined command current; a comparison module configured to calculate a difference between the command current and an output current of an inverting module; a current controller configured to perform a proportional-integral (PI) control based on the difference; and a frequency estimation module configured to estimate a rotation speed of a motor based on a current response to the command current while the command current is injected to the current controller, wherein the main controller is further configured: when a flying start operation of the inverting module begins, to set an output frequency of the inverting module based on the rotation speed of the motor estimated by the frequency estimation module.

This invention relates to a method for maintenance of a transportation device propelled by an electric motor, wherein an incremental encoder senses motion of a moving part of or a part moved by said electric motor, wherein a motor model is used in control of said electric motor, wherein said method comprises: acquiring a pulses-per-rotation configuration value PPRconf, representing a number of pulses which should be provided by the incremental encoder per one rotation of the electric motor in normal operation; deriving a pulses-per-rotation estimation value PPRest representing a number of pulses per one rotation of the electric motor, based on motor model information of the electrical motor control; determining a pulses-per-rotation error value PPRerr representing a deviation of the pulses-per-rotation estimation value PPRest from the pulses-per-rotation configuration value PPRconf, based on the relation:

PPRerr=PPRestPPRconf or PPRconfPPRest or PPRest/PPRconf or PPRconf/PPRest; and utilizing the pulses-per-rotation error value PPRerr for establishing a maintenance information indicating that a maintenance should be done on the transportation device. Other aspects are a software program realizing the method, and a controller for controlling a transportation device.

An apparatus for controlling an AC power supply for an electric motor, said AC power supply being derived from a DC voltage. The apparatus including a comparer configured to provide a comparison of a modulation index of a motor control signal with a reference value. This current data provider is configured to provide current data based on a torque demand signal; a speed signal indicating the speed of rotation of the AC motor; and an indication of the DC voltage modified on the comparison for control of the motor control signal which is based on the motor current data.

An adjustable vehicle mirror assembly uses a revolution sensor for detecting revolutions of an element in a mirror rotation drive chain. A control circuit uses the revolution sensor control rotation of the mirror to a preset orientation by counting revolutions and controlling a motor power supply and its direction dependent on whether the count indicates that the count of revolutions has reached a preset value. At power down, power up or when a new preset value is defined the control circuit switches to an overrule state in order to calibrate an offset. The control circuit continues operating in the overrule state until a rotation coupling in the mirror assembly reaches a disengaged state or stalls.

The present invention relates to a method (200) and system (100) for controlling a rotary electric machine wherein a state of the rotary electric machine is determined between a low speed state and a high speed state. In the low speed state, a first rotor position (P1) and a first rotor speed (S1) are estimated based on intra-PWM current ripple (?X), a mean current vector (Y) and an inductance vector. A second rotor position (P2) and second rotor speed (S2) is estimated based on average current flowing through stator phase windings. State of rotary electric machine is selected based on estimated first rotor speed (S1) and/or estimated second rotor speed (S2). At low speed state, PWM signals are updated based on estimated first rotor position (P1), and at high speed state, PWM signals are updated based on estimated second rotor position (P2).

A system for detecting faults in a motor includes a drive circuit, a detection circuit, and a controller. The drive circuit is configured to apply a drive signal to a motor. The detection circuit is configured to detect a response signal generated when the drive signal is applied to the motor. The controller is configured to determine a motor fault based on a comparison of the response signal to an expected signal for the drive signal applied to the motor. The drive signal is selected to generate a rotating magnetic field in the motor with a rotation-frequency greater than a maximum mechanical-response-frequency of the motor.

In an apparatus, a determiner determines whether a two-MG frequency ratio of a first electrical frequency of a first MG to a second electrical frequency of a second MG is within a specific frequency-ratio range. The specific frequency-ratio range includes 1/6n where n is an integer excluding zero. An update-cycle controller controls an update cycle of a command voltage according to the determined result such that the update cycle during a specific drive of the first MG is longer than the update cycle during a usual drive of the first MG while a cycle of a carrier signal is maintained during both the usual and specific drives. The specific drive represents drive of the first MG while the two-MG frequency ratio is within the specific frequency-ratio range. The usual drive represents drive of the first MG while the two-MG frequency ratio is out of the specific frequency-ratio range.

A method for rotor angle estimation for a 3-phase BLDC or stepper motor with a saliency ratio different from 1 includes receiving a requested duty cycle per motor phase from a motor control algorithm or deriving it from an output voltage per motor phase. The method involves providing a PWM pattern to each motor phase during operation, where the PWM pattern per motor phase matches the requested duty cycle or includes an equal fixed additional duty cycle. Current slopes in each motor phase are measured during active PWM pulses, and these measured current slopes or their average are compared to estimate the rotor angle.