Abstract: To provide a controller for AC rotary machine which can detect current of the normal phase certainly when the short circuit failure of one phase occurs, in an apparatus that a current sensor is connected in series to the positive electrode side switching device or the negative electrode side switching device of an inverter. A controller for AC rotary machine, when determining that the short circuit failure of any one phase occurred, calculates voltage command values of normal n?1 phases, and changes the voltage command values of the normal n?1 phases so that on period of the detection object device of each phase of the normal n?1 phases become longer than or equal to a length necessary for current detection at least at a current detection timing.

Abstract: A display device includes a display panel including a display area, a first area spaced apart from the display area, and a second area disposed between the display area and the first area. An optical layer is disposed on the display panel and extends from the display area to a portion of the second area. A protective member includes a first protective layer disposed on the display panel in the first area and a second protective layer disposed on the display panel in the second area and having a thickness less than a thickness of the first protective layer.

Abstract: A motor driver using a correcting mechanism on a sensed motor position is provided. A rotor position detector circuit senses a position of a rotor of a motor to output a commutation signal. A back electromotive force detector circuit detects a back electromotive force signal of the motor. An actual phase difference calculator circuit calculates a phase difference between the back electromotive force signal and the commutation signal as an actual phase difference. An error phase angle calculator circuit calculates a difference between the actual phase difference and a reference phase difference as an error phase angle. A motor driving circuit corrects the commutation signal according to the error phase angle. The motor driving circuit determines the position of the rotor of the motor to drive the motor according to the corrected commutation signal.

Abstract: An apparatus configured for driving a motor, includes a first inverter including a first switching elements and connected to a first end of each of a windings respectively corresponding to a plurality of phases of the motor, a second inverter including a second switching elements and connected to a second end of each of the windings, a switches including first ends respectively connected to nodes to which the windings and the second switching elements are respectively connected and second ends connected to each other, and a controller configured to drive the motor in one of a first driving mode for driving the motor by maintaining the second switching elements in an open state and performing pulse width modulation control for the first switching elements and a second driving mode for driving the motor by performing pulse width modulation control for the first switching elements and the second switching elements.

Abstract: There are described herein methods and systems for operating an electric motor of a watercraft. In one method, the electric motor of the watercraft is controlled based on commands received from an accelerator of the watercraft, a sensor signal is received from at least one sensor of the watercraft while the electric motor is in operation, the sensor signal indicative of an undesirable condition of a water intake of the watercraft, and a change is effected to the controlling of the electric motor in response to receiving the sensor signal.

Abstract: A system for controlling one or more loads. The system comprises a plurality of power converters, wherein each power converter is configured to be arranged in a parallel configuration with one or more additional power converters so as to control the one or more loads, and a central controller configured to output a common reference based on local current or voltage values received from each power converter; and transmit the common reference to each of the power converters. Each power converter comprises an inverter configured to control the one or more loads based on voltage switching signals, a module configured to provide the voltage switching signals to the inverter according to a modulation scheme.

Abstract: A method for identifying a malfunction in an inverter-motor assembly, including a plurality of sequential diagnostic procedures each having the following steps: a step of initially configuring the inverter; a step of initially configuring the phase switches; a step of biasing the phases; a voltage measurement step in which the voltage of each phase is measured; a comparison step in which the voltage measurement of each phase is compared with an expected resultant value; and a step of identifying a malfunction when the voltage measurement of a phase differs from the expected resultant value.

Abstract: A method for backlash compensation in motion control systems includes homing a payload of a motion control system, and performing a tooth-pitch non-uniformity procedure on the motion control system to identify a non-uniformity correction. A backlash lookup table is generated for use in backlash correction during normal operation of the motion control system. The backlash lookup table is generated using a training process that includes selecting a move sequence for operating the motion control system, and executing the move sequence with the non-uniformity correction. The training process further includes computing a backlash measurement describing backlash of one or more components of the motion control system during the move sequence, and storing the backlash measurement in the backlash lookup table.

Abstract: A motor control device includes temperature detection elements that are mounted on a circuit board on which a first power conversion circuit and a second power conversion circuit are mounted and are arranged at a position between the first power conversion circuit and the second power conversion circuit.

Abstract: A wound rotor, such as a wound rotor for an electric machine, includes a shaft having a main axis. The shaft includes a manifold. The wound rotor also includes a winding wire and n poles wound and ordered with an ascending order number obtained by rotation about the main axis. The n wound poles can be distributed radially about the main axis. The n poles are wound with the wire in series in turn according to their ascending order numbers, the last pole, however, not being wound last.

Abstract: A driver device supplies an output current to each coil in a stepping motor to rotate a rotor. After the polarity and magnitude of the output current for each coil have reached the target polarity and magnitude, during control for keeping the polarity and magnitude of the output current for each coil at the target polarity and magnitude, occurrence of a particular current waveform in the output current due to a back-electromotive force resulting from the rotation of the rotor is detected so that, if a particular current waveform is detected, a predetermined detection signal is transmitted to an external device.

Abstract: A system is provided that can automatically calibrate or define a home or initial position of a moveable component of an industrial machine. During the calibration procedure, an actuator may be operated in a low speed and/or low torque mode to drive the component until the component contacts a mechanical stop. This provides a hard-stop of the component's movement while the actuator attempts to further drive the component, which creates a stall condition of the actuator. A control system monitors that actuator's performance characteristics and is configured to identify an anomalous performance characteristic(s) value that corresponds to the actuator's stall condition as a triggering event. When the control system identifies the triggering event, it defines the component's position as a null point and determines a zero point to define an initial operational position of the component as a function of the null point.

Abstract: A mobile robot includes a driver configured to provide a traveling function, a body disposed at an upper side of the driver and configured to include a head coupling hole formed at an upper portion thereof, and a head configured to include a head bracket inserted into the head coupling hole of the body. The body includes a head fixing frame fastened to the head bracket, a first bolt configured to fix the head fixing frame and the head bracket, and a repair cover coupled to an opening formed in a backward direction. The head is separated from the body when the first bolt is released by opening the repair cover.

Abstract: A drive system establishes a normal state in which a first switch is ON and a gang switch is OFF, in the case where it is determined that there is no abnormality in the state of a first rotating body driven by a first motor. In this normal state, the first motor is driven by a first inverter, while a second motor is driven by a second inverter. It the case where it is determined that there is abnormality in the state of the first rotating body, a first countermeasure state is established in which the first switch is OFF and the gang switch is ON. In this first countermeasure state, the second motor is driven by both the first inverter and the second inverter.

Abstract: There are described herein methods and systems for operating an electric motor of a watercraft. In one method, the electric motor of the watercraft is controlled based on commands received from an accelerator of the watercraft, a sensor signal is received from at least one sensor of the watercraft while the electric motor is in operation, the sensor signal indicative of an undesirable condition of a water intake of the watercraft, and a change is effected to the controlling of the electric motor in response to receiving the sensor signal.

Abstract: A mobile robot includes a driver configured to provide a traveling function, a body disposed at an upper side of the driver, a concave portion recessed inward from a surface of the body, a vent hole formed at an upper side of the concave portion, and a guide inclined surface formed at a lower side of the concave portion. During traveling of the mobile robot, the mobile robot induces inflow of air so that the body can be cooled.

Abstract: Methods, controllers and electric machine systems are described for selective phase control of electric machines (e.g. electric motors and generators).

Abstract: A method of operating a power tool having a motor and a controller is provided. The method includes: receiving a position of a variable-speed input mechanism mounted on the power tool; determining a target speed of the motor corresponding to the position of the variable-speed input mechanism; determining an underspeed threshold corresponding to the target speed; determining a rotational speed of the motor; and interrupting a supply of power to the motor if the rotational speed of the motor is less than the underspeed threshold.

Abstract: A bi-directional power converter includes: a plurality of input nodes, each input node configured to electrically connect to one phase of a multi-phase AC electrical power distribution network; and an electrical network configured to convert alternating current (AC) to direct current (DC) and to convert DC current to AC current, the electrical network including a plurality of electronic switches. The bi-directional power converter also includes a control system configured to: estimate harmonic voltage content at three intermediate nodes in the bi-directional power converter based on a measured electrical quantity; and control the electronic switches to compensate for the estimated harmonic voltage content.

Abstract: A window can be used to detect objects located within an opening. A structure can define the opening. The window can be operatively positioned within the opening. The window can be movable to selectively open and close the opening. The window can include an optical grating operatively positioned near a closing edge of the window. A light source configured to emit light toward the optical grating. A detector operatively positioned to acquire spectroscopic data of the light emitted from the light source after the light has interacted with the optical grating. A processor can be operatively connected to the detector. The processor can be configured to: determine a temperature based on the spectroscopic data; determine, based on the temperature, whether an object is located in the opening; and responsive to determining that an object is located in the opening, control a movement of window.