Abstract: An apparatus for controlling a motor having a housing in which a stator and a rotor are disposed. The motor is cooled by a cooling oil in the housing. The apparatus includes a control unit configured to control the motor. The control unit has a temperature increase mode for heating the cooling oil with use of heat generated by a resistance of a coil provided in the stator.

Abstract: Provided is an electric power system capable of rapidly slowing an electric motor and quickly discharging a capacitor when an abnormality occurs. If an abnormality detection device detects an abnormality, a control device of an electric power system performs a switching control that alternately switches between an upper arm three-phase short-circuit control that sets all upper arms to a conductive state and sets all lower arms to a non-conductive state, and a lower arm three-phase short-circuit control that sets all upper arms to a non-conductive state and sets all lower arms to a conductive state. When switching between the two short-circuit controls, a conduction overlap period in which the conductive state of said upper arms and the conductive state of said lower arms overlap may be generated.

Abstract: A stepping motor includes a rotor, a stator and three coils. The rotor is two-pole magnetized in a radius direction. The stator is provided with a rotor receiving section for receiving the rotor. The three coils are magnetically connected with the stator. At least one of the three coils is an integrated coil which is integrally formed with the stator by winding a coil around a part of the stator.

Abstract: A switched capacitive device includes a stationary portion including a plurality of first electrodes extending at least partially in a longitudinal dimension. Each first electrode has a first substantially active electrode volume. The device also includes a translatable portion including a plurality of second electrodes proximate the plurality of first electrodes. Each second electrode has a second substantially active electrode volume. The first active electrode volume is greater than the second active electrode volume. The second electrodes are translatable with respect to the first electrodes. The second electrodes extend at least partially in the longitudinal dimension. The first electrodes are configured to induce substantially linear motion of the second electrodes in the longitudinal dimension through the use of an electric field induced by at least a portion of the first electrodes.

Abstract: An electric motor includes a configuration that directs at least a portion of an electric field generated by phase windings into a stator.

Abstract: A system and method for wirelessly providing power to independent movers traveling along a track includes a sliding transformer to transfer power between the track and each mover. The sliding transformer includes a primary winding extending along the track and a secondary winding mounted to each mover. Each of the primary and secondary windings may be formed of a single coil or multiple coils. The primary and secondary windings are generally aligned with each other and extend along the track and along the mover in the direction of travel with an air gap present between the windings. A power converter on the mover may regulate the power supplied to the mover to control an actuator or a sensor mounted on the mover or to activate drive coils mounted on the mover to interact with magnets mounted along the track and, thereby, control motion of each mover.

Abstract: Systems and methods for driving a motor are provided. One implementation of a drive system comprises a user interface, a variable speed drive, and a controller. The user interface enables a user to select an operating frequency set point and an operating voltage set point. The operating frequency set point is selected from a range of frequency set points and the operating voltage set point is selected from a range of voltage set points. The variable speed drive is configured to drive a motor at the selected operating frequency set point and selected operating voltage set point. The controller is configured to receive input from the user interface and control the operating frequency and operating voltage of the variable speed drive.

Abstract: A Method for detecting stalling of an electric stepper motor (18), with the following steps is shown: a) samples of the voltage at a coil of the stepper motor (18) are taken continuously or in regular intervals, b) a deviation value is determined corresponding to the deviation between the measured voltages of the two samples, and c) the deviation value is used to determine whether the electric motor (18) is stalling. Further, a stepper motor and a heating, ventilation and/or air conditioning system is shown.

Abstract: A system for detecting overloads of a motor comprises a motor configured to receive power via a lead line, a first sensing device configured to sense a temperature of a motor, and a second sensing device electrically coupled to the motor and configured to detect a target current of the motor and trigger a contact of the lead line associated with second sensing device when the target current equals or exceeds a trip value.

Abstract: A motor is driven while suppressing drive torque ripple generated by the motor, when any of the phases is opened during the driving of the motor. A motor drive device controls the driving of a motor in which the armature windings of respective phases are independently provided. The motor drive device is equipped with: an inverter circuit for converting the DC power supplied through DC bus lines to three-phase AC powers and respectively outputting the three-phase AC powers to the armature windings of the respective phases; and a controller for controlling the inverter circuit. When any of the phases is opened in the AC powers output from the inverter circuit, the controller adjusts the difference between the phases of the respective currents flowing through the armature windings of normal phases so that the AC powers of the other normal phases except the opened phase are compensated each other.

Abstract: A safety system for an electric motor controller is provided. The safety system includes a torque safety monitor having a first processor distinct from a second processor of a main motor controller. The first processor is configured to one of decrease or shut down AC (alternating current) power, sent from a DC/AC (direct current to alternating current) inverter to an electric motor, in response to an estimated torque of the electric motor differing from a commanded torque associated with the main motor controller by more than a set amount.

Abstract: This invention is concerning a control device of an AC rotating machine that estimates, as an estimated rotational position, a rotational position of an AC rotating machine having N sets of three-phase windings where N is a natural number equal to or greater than 2, the device being made up of: a voltage sum calculator that calculates a voltage sum from N sets of voltage commands for applying AC voltage to the N sets of three-phase windings; a current sum calculator that calculates a current sum from N sets of currents respectively flowing in the N sets of three-phase windings; and a rotational position estimator that calculates an estimated rotational position on the basis of calculation results of the voltage sum calculator and the current sum calculator.

Abstract: The invention relates to a method for sensor-free position determination of the rotor position of an electronically commutated multiple-phase EC motor comprising a rotor, and a stator and comprising a commutation device for generating string currents in the coil system of the stator by applying a test signal in the coil system, measuring the current value i in the strand during the measurement phase (PHMess) as a current response to the test signal, calculating i for determining the envelope determining of the current response and determining the rotor position therefrom.

Abstract: The invention provides a control circuit and a method for qualifying a fault for a synchronous machine.

Abstract: In accordance with an example embodiment of the invention, in an overload relay for a three-phase motor, an adjusted threshold for detected current phase unbalance is dynamically determined at which the relay will be tripped. The adjusted threshold is a function of a ratio of an average of currents in the three-phases to the rated full load current of the motor, i.e., motor load. As the motor load decreases, the adjusted current phase unbalance threshold is increased, causing the resulting trip time to increase, thereby increasing motor run time and reducing downtime.

Abstract: A control apparatus of an MDPS system may include: a current supply unit configured to drive a motor by injecting a preset frequency and magnitude of current to the motor; a torque sensor configured to sense a torque of a steering shaft; a hall sensor fault determination unit configured to determine whether a fault has occurred in a hall sensor; a torque signal processing unit configured to process a signal outputted from the torque sensor and calculate the magnitude of a torque signal; an encoder fault determination unit configured to determine whether a fault has occurred in an encoder, using the torque signal outputted from the torque signal processing unit; and a motor control unit configured to acquire a position of a motor rotor according to the determination results of the hall sensor fault determination unit and the encoder fault determination unit, and control the operation of the motor.

Abstract: A motor is provided that is capable of electronically switching between operating in a high torque mode and a low torque mode. The high torque mode may be switched reluctance mode and the low torque mode may be synchronous reluctance mode. The motor has a stator having two sets of armature windings, and a rotor having two sets of flux barriers each adapted to shape a magnetic flux distribution generated by a corresponding one of the sets of armature windings. The stator may comprise a plurality of teeth circumferentially spaced apart from one another around a rotation axis of the motor. The armature windings may include switched reluctance armature windings, each wrapped around a single stator tooth, and synchronous reluctance windings, each wrapped around multiple adjacent stator teeth. An inverter and controller may be connected to each set of armature windings for controlling the electronic switching of the armature windings.

Abstract: A control method for controlling a synchronous motor includes calculating d-axis and q-axis current commands according to a frequency command and frequency of the synchronous motor by a MTPA control unit; when a feedback output voltage of the synchronous motor is larger than a control level, outputting a flux-weakening current command by a voltage control unit; calculating a flux-weakening current feed-forward value according to the frequency, a target level and the q-axis current command by a feed-forward control unit; when the sum of the flux-weakening current command and the flux-weakening current feed-forward value is smaller than the d-axis current command, adjusting the d-axis current command by the sum of the flux-weakening current command and the flux-weakening current feed-forward value; and outputting d-axis and q-axis voltage commands according to the adjusted d-axis current command and the q-axis current command to control the synchronous motor.

Abstract: In the drive device for a three-phase synchronous motor, if one of the two rotational position detectors is defective, it is necessary to identify the rotational position detector having abnormal output and is in the detective state. To do this, three or more rotational position detectors are required, which increases costs of the rotational position detectors. By comparing the outputs of two rotational position detectors, an abnormality of ether one of the two detectors is detected. The abnormal detector is identified with the use of rotational position estimating means. The drive of the three-phase synchronous motor is controlled with the use of the output ? of the properly functioning one of the first and second rotational position detectors.

Abstract: To realize a reduction in the number of parts in a system including a driver IC (semiconductor device). A high potential side power supply voltage is applied to a power supply application area. A high side area is formed with a circuit which includes a driver driving a high side transistor and is operated at a boot power supply voltage with a floating voltage as a reference. A low side area is formed with a circuit operated at a power supply voltage with a low potential side power supply voltage as a reference. A first termination area is disposed in a ring form so as to surround the power supply application area. A second termination area is disposed in a ring form so as to surround the high side area.