Abstract: A total dimension of spacing dimensions of a gap provided by a metal rod on a side opposite to a metal housing in a first assembling structure and a second assembling structure is set to be larger than a difference in a thermal expansion amount between a resin lid main body and the metal housing in a reference radial direction when a temperature exceeds a reference temperature. A total dimension of each of a spacing dimension of a gap provided by the metal rod on a side toward the metal housing and a spacing dimension between a resin protrusion and the metal housing in the first assembling structure and the second assembling structure is set to be larger than a difference in a thermal shrinkage amount between the resin lid main body and the metal housing in the reference radial direction when a temperature falls below the reference temperature.

Abstract: The present invention relates to a control device and to a control method for a vehicle drive mechanism including a moving body having a movability range regulated by two stoppers, and a sensor which senses a position of the moving body. The control device of the present invention learns an output of the sensor corresponding to a contact state of a high-rigidity stopper, and limits, to a lower level, an operation variable of the actuator for moving the moving body toward a low-rigidity stopper along with an increase in an amount of change in the output of the sensor from the contact state of the high-rigidity stopper. Then, the control device learns the output of the sensor corresponding to the contact state of the low-rigidity stopper, and controls the actuator based on the output of the sensor learned at both the stopper positions.

Abstract: A method for controlling an electric motor of a vehicle pump used to deliver a medium. According to the method, a period required for at least one partial revolution of a rotor of the electric motor is determined. The fluctuations during the period can represent a measurement of the true running of the electric motor. The speed of the electric motor can be altered depending on the deviation of the period from a comparative value. As a result, the true running of the electric motor can be guaranteed once again.

Abstract: An apparatus includes a magnetizing circuit configured to be coupled to a transformer and to selectively provide a magnetizing current to the transformer and a control circuit configured to cause the magnetizing circuit to provide the magnetizing current following disconnection of the primary winding of the transformer from the power source. The magnetizing circuit may be configured to provide the magnetizing current from a first source following disconnection of the primary winding from a second source. The transformer may include a first transformer and the apparatus may further include a second, higher impedance transformer coupled between the second source and the first transformer. In further embodiments, the magnetizing circuit may include a solid-state converter.

Abstract: Disclosed is a method for configuring a motorized drive device for a closure or solar protection unit, the method including: a step in which a low end-of-travel position of a screen is determined automatically; a step in which the magnitude of an electric current passing through an electric motor is measured by a measurement device; a step in which a variation in the value magnitude is determined; and a step in which an obstacle-detection threshold value is determined during the movement of the screen towards its unwound position, according to the variation in the measured magnitude.

Abstract: A compressor driving device includes: a controller that PWM drives a compressor; an inverter circuit unit that supplies power to an electric motor included in the compressor; a drive circuit that drives the inverter circuit unit according to a control signal; a voltage detector that detects a voltage that is output to the electric motor; and a current detector that detects a current that is output to the electric motor. When a product of a detection value of the voltage detector and a detection value of the current detector is greater than a predetermined comparison value, a duty ratio of the control signal is reduced to cause the input power supplied to the electric motor by the inverter circuit unit to have a predetermined input power level or less.

Abstract: An inverter drive device for driving a semiconductor switching element that controls an output current of an inverter. An inverter drive device includes a drive circuit configured to apply a drive voltage to the semiconductor switching element, to thereby turn the semiconductor switching element on and off, the turning off of the semiconductor switching element causing a counter electromotive force to be generated therein, a clamping diode configured to clamp a voltage of the generated counter electromotive force, a voltage dividing resistor configured to detect a voltage that is proportional to a current flowing through the clamping diode, and an auxiliary drive circuit configured to generate a control voltage in accordance with the voltage detected by the voltage dividing resistor, and to apply the control voltage to the semiconductor switching element, to thereby turn the semiconductor switching element on.

Abstract: A collision stress releasing device reversely rotates a feed motor by a return amount set in a return amount setter based on a contact position of a movement unit or a collision detection position regarded as a contact position. Generally, a large error does not occur even when the collision detection position is regarded as the contact position, but when the movement unit or the colliding member has low rigidity, a control of setting a return amount in response to the speed of the movement unit or a control of estimating an actual contact position from a rise curve of a load after a collision is more desirable.

Abstract: A motor drive control device for electric power steering includes: a switching element for supplying current to a motor; a smoothing capacitor for reducing ripple current due to the switching element; a control board on which a drive circuit for controlling the switching element and a control circuit capacitor are mounted; a control signal line for supplying a control signal from the control board to the switching element; an electric connection member electrically connecting the switching element and the smoothing capacitor; and a heatsink portion in which the switching element is arranged in an embedded manner, wherein the electric connection member is arranged between the switching element and the control board, and the control circuit capacitor and the smoothing capacitor are arranged in a space between the electric connection member and the control board.

Abstract: A stepping motor control device is provided with a stopping position determination section and a drive control section. The stopping position determination section determines whether a mover stopping position during the holding state is a stabilized phase or a semistable phase. When it is determined that the mover stopping position is a semistable phase during the holding state by the stopping position determination section, and the control state of the stepping motor transitions from the holding state to the standby state in which the holding of the mover is released due to a trigger signal from a device or the holding state persisting for a fixed time, the drive control section changes the mover stopping position to one of the stabilized phases adjacent to the mover stopping position during the holding state.

Abstract: A motor control apparatus includes an AC-DC converter, an auxiliary power source, and an inverter. The AC-DC converter converts AC power into DC power and feeds the DC power to a DC bus bar. DC power is fed from the auxiliary power source to the DC bus bar and from the DC bus bar to the auxiliary power source. The inverter converts the DC power of the DC bus bar into the AC power and feeds the AC power to a motor. The auxiliary power source includes a capacitor, a DC-DC converter, and circuitry. The DC-DC converter performs conversion between a first DC voltage of the DC bus bar and a second DC voltage applied between both terminals of the capacitor or inside of the capacitor. The circuitry is configured to control the DC-DC converter to maintain positive correlation between the second DC voltage and the first DC voltage.

Abstract: A fluid extraction system is presented. The fluid extraction system includes a direct current (DC) bus and a plurality of fluid extraction sub-systems configured to be electrically coupled to the DC-bus. At least one fluid extraction sub-system includes an electric machine configured to aid in the extraction of a fluid from a well. The electric machine includes a plurality of phase windings and a rotor. The at least one fluid extraction sub-system further includes a control sub-system to control a rotational speed of the rotor by selectively controlling a supply of a phase current to the plurality of phase windings such that the rotational speed of the rotor of the electric machine is different from rotational speed of a rotor of another electric machine in at least one of other fluid extraction sub-systems. Related method for controlling rotational speeds of electric machines is also presented.

Abstract: A machine learning apparatus, which learns a condition associated with arrangement positions of magnets on a core of a motor rotor, includes: a state observation unit that observes a state variable composed of data relating to arrangement positions of a plurality of the magnets arranged on the core, data relating to a magnitude of cogging torque generated when the plurality of the magnets are arranged at the respective arrangement positions, and data relating to a magnetic flux density of each of the magnets; and a learning unit that learns the condition associated with the arrangement positions of the magnets on the core in accordance with a training data set constituted by the state variable.

Abstract: A driving method used in a driver device for driving an electric gripper is disclosed to include the step of providing a state signal that is generated according to the operation state of the electric gripper, the step of receiving an action instruction and detecting a feedback signal indicative of the action of the electric gripper when the state signal is an idle state, and the step of outputting the action instruction if the action of the electric gripper indicative of the action instruction is not in consistency with the action of the electric gripper indicative of the feedback signal. Thus, the driving method of the present invention needs not to provide a trigger signal for commanding the electric gripper to execute the action instruction.

Abstract: Eddy current retarder equipment (1) able to be carried on board a vehicle, includes: a stator assembly (2), including inductor windings (23) forming a circuit (4), a rotor assembly (3) designed to be mounted on a transmission shaft of the vehicle, including an armature (31) facing the inductor windings (23), control elements (6) for establishing a linear setpoint (?), excitation elements (7) for exciting the inductor circuit (4) from an electric power source (5) of the vehicle as a function of the setpoint (?), a speed sensor (9) for supplying information relating to the rotational speed (?) of the rotor assembly (3), a sensor (10) of the strength of current supplied to the inductor circuit (4), processing elements (8) for estimating, at a given moment (t), the retarding torque supplied by the equipment (1).

Abstract: The invention relates to a medical apparatus having a medical optical appliance and a holding device with at least two holding arms which are connected movably to one another with at least one degree of freedom of movement via a joint and with an actuator which is connected to the two holding arms in such a way that a force can be exerted via the actuator between the two holding arms in the direction of the degree of freedom of movement. A control unit comprises a first regulator for outputting a first control signal to the actuator via an adjusting element. The medical optical appliance is mounted on the holding device.

Abstract: An electronic pump includes a controller. The controller includes a power input terminal, a printed circuit board, a motor driver and a microprocessor. The power input terminal, the microprocessor and the motor driver are spaced from each other by an electronic clearance and are fixedly connected to the printed circuit board. The microprocessor is electrically connected to the motor driver by the printed circuit board. The motor driver drives a motor to rotate based on a drive control signal from the microprocessor. There is no motor drive circuit composed by discrete components and configured to drive the motor to rotate separately arranged on the printed circuit board between the motor driver and a motor.

Abstract: A method for detecting an open-phase condition of a transformer having a grounded-wye high voltage side connection including monitoring current flowing in a neutral connection on the high voltage side of the transformer in real time by voltage relaying and current relaying to identify an open phase condition signature in a signal capable of characterizing change of current magnitude. A current signal may be injected onto the neutral terminal and the zero-sequence mode of the transformer monitored to detect an open-phase condition indicated by an increase in network impedance and decrease or elimination of the injection current.

Abstract: A method of compensating for a current sensor offset of an inverter includes: calculating a current sensor offset based on an output value of a current sensor, which detects an output current of the inverter, after a vehicle has started and before a current control of the inverter is performed; actuating the inverter to perform the current control according to the calculated current sensor offset; determining whether the inverter enters a burst mode while performing the current control; and re-calculating the current sensor offset based on the output value of the current sensor when the inverter is determined to enter the burst mode.

Abstract: A motor-driven compressor includes a three-phase motor including a rotor, a housing, a compression unit, a drive circuit, and a controller. The drive circuit includes u-phase upper and lower arm switching elements, v-phase upper and lower arm switching elements, and w-phase upper and lower arm switching elements. The controller performs a deceleration control in response to the rotor being rotating in a direction opposite to the forward direction. The controller controls the drive circuit in a switching control mode that includes a first mode, in which one or more switching elements of the upper and lower arm switching elements of the three phases are activated while the remaining switching elements are deactivated, and a second mode, which differs from the first mode in a combination of the activated and deactivated switching elements.