Abstract: A device converts electrical energy into heat in the field of drive voltage technology and/or high voltage technology. The device contains a brake resistance and at least one controllable brake power semiconductor for controlling the conversion, enabling a rapid and economical transformation of effective power into heat as required. To this end, the brake resistance contains a plurality of individual brake resistances that are each part of a bipolar submodule. The submodules are connected in series, form a submodule series connection, and at least partially contain an energy accumulator respectively connected in parallel to an associated individual brake resistance and a controllable brake power semiconductor, which allows the current flow over the respectively associated individual brake resistance in a brake position, and interrupts the current flow over the brake resistance in a normal operating position.

Abstract: A control system of a milling machine is disclosed. The milling machine has an overarm, a spindle connected to a cutter, a spindle motor, and an X-axis motor, a Y-axis motor and a Z-axis motor. The control system includes a vibration sensor for detecting a vibration level of the spindle. The control system also includes a central control unit configured to adjust a rotation speed of at least one of the X-axis motor, the Y-axis motor, and the Z-axis motor to bring a load current of at least one of the motors to be within a corresponding current range, and configured to adjust a rotation speed of the spindle motor to bring the vibration level to be within a vibration range.

Abstract: An image forming apparatus includes an engine unit used for performing an image forming job, an engine control unit which controls the operation of the engine unit, a brushless direct current (BLDC) motor which drives the engine unit, a sensor unit which senses the driving information of the BLDC motor, a communication interface unit which receives a digital control command with respect to the BLDC motor from the engine control unit, a driving signal unit which generates a driving signal to control the BLDC motor, and a digital control unit which controls the operation of the driving signal unit in a digital PLL manner, based on the received digital control command, the detected driving information and a digital gain value as a control factor with respect to the BLDC motor.

Abstract: There is provided a control system for an electric motor to which electric power is supplied from a DC power supply via a multi-phase inverter, the multi-phase inverter including switch units respectively provided on a positive side and a negative side of arms corresponding to respective phases, each switch unit including a switching element and a reflux diode connected in parallel thereto. The control system comprises a phase current detection unit for detecting phase currents which flow between the inverter and the electric motor, a DC component acquiring unit for acquiring DC components of the respective phase currents, and a short-circuiting determination unit for determining that a short-circuit failure occurs in the inverter when at least one of the DC components of the phase currents acquired by the DC component acquiring unit exceeds a threshold. Consequently, the short-circuit failure of the inverter can be detected even though the control of the electric motor is stopped.

Abstract: A method and a circuit arrangement are provided which enable a mechanical load applied to the motor shaft of a stepper motor (M) or a load angle of the stepper motor to be detected in a sensorless manner. A method and circuit arrangement are also provided which enable the motor current(s) of a stepper motor to be controlled in accordance with the load value such that the load angle is as high as possible without risking step losses, in order to maintain the current consumption of the motor as low as possible. This is achieved according by evaluating the temporal duration of the ON- and the FD-phases during the chopper control of the motor.

Abstract: The invention relates to a device having a polyphase electrical machine, wherein a plurality of inverters (36, 37, 38), which are controlled by an interlaced control modulated by pulse width to an identical cutoff frequency, provide, on the phase outputs thereof, an alternating voltage signal having an identical fundamental frequency, amplitude and phase to an electrical machine (2) that comprises at least two separate so-called star windings (33, 34, 35), each star winding being supplied by a related inverter, each phase output of which is connected to a phase circuit that includes the phase winding of the star winding, the device being characterized in that each phase circuit for a star winding has a negative mutual inductance with the homologous phase circuit of another star winding.

Abstract: A load drive control device includes a driver that drives a load which is operable by a DC drive and a pulse modulation drive, a protecting section that detects an electric current flowing in the driver, a temperature detecting section that detects a high temperature state of the driver, and a control section that determines whether the load is operated by the DC drive or the pulse modulation drive, based on outputs from the protecting section and the temperature detecting section. The control section switches the driver in the DC drive and measures the electric current flowing in the driver when a temperature equal to or higher than a predetermined temperature is detected during the pulse modulation drive.

Abstract: A three-phase AC motor drive control device has a phase command calculation unit. When driving a three-phase AC motor by a three-phase alternating square-wave voltage that is converted in power according to a switching command corresponding to one cycle of the electrical angle obtained from a rotational position of the rotor of the three-phase AC motor, the phase command calculation unit performs a torque feedback calculation based on a torque deviation, obtains, based on this calculation result, a phase command that is the lead or lag angle amount of a phase to be corrected, and stores and updates this obtained phase command. To generate the switching command, the three-phase AC motor drive control device outputs a pulse pattern to an inverter, the pulse pattern being shifted in phase by the amount of the phase command with respect to the basic phase of the three-phase alternating square-wave voltage uniquely determined with respect to the one cycle of the electrical angle.

Abstract: The present invention relates to a low-cost windshield wiper control system which can be readily incorporated into existing vehicle systems, particularly into an operator-accessible windshield wiper control unit assembly (100). The windshield wiper control assembly (100) is selectively operable as an intermittent wiper control system, or as a rain sensing windshield wiper control system without the need for microprocessors or multiplex circuitry.

Abstract: A control device has a predicting unit for predicting a first current flowing through a motor in a next control period, at a predicting time during a predetermined period after a change of switching state in an inverter by using a current detected before the change and for predicting a second current of a control period later than the next control period by one control period by using the predicted first current, a determining unit for determining a next operating state of the inverter by using the predicted second current and an instructed value so as to reduce a change of switching state in the change of the operating state, and a control unit for controlling the inverter to be set in the determined operating state in the next control period and controlling the current of the motor depending on the operating state of the inverter.

Abstract: A motor driving device driving coil terminals of a three-phase motor to flow three-phase currents includes: a pulse modulator generating three-phase modulation pulses, each of which has a duty ratio in accordance with a voltage level of a coil terminal; a shift amount selection unit selecting a first shift amount corresponding to at least one of two predetermined amounts according to a pulse width of the longest pulse among the three-phase modulation pulses; a first shift unit shifting the second-longest pulse among the three-phase modulation pulses backward by the first shift amount to delay timing; a second shift unit shifting the third-longest pulse among the three-phase modulation pulses backward by a predetermined second shift amount to delay timing; and an inverter driving each of the coil terminals by switching a driving power supply with the three-phase modulation pulses by reflecting shift results of the first and second shift units.

Abstract: In a motor control device, a control calculation unit obtains a phase voltage instruction value. A current detecting unit detects an electric current which flows into the brushless motor. A rotational position detecting unit detects the rotational position of a rotor in the brushless motor. A correction unit corrects the phase voltage instruction value based on the detection results of the current detecting unit and the rotational position detecting unit so that a dependency of a ratio on an electric angle shown by a secondary harmonic component of the ratio concerning the electric angle of the brushless motor. The ratio is a ratio of a q-axis or d-axis component of the electric current, which flows into the brushless motor, to a q-axis or d-axis instruction value. A driving unit drives the brushless motor based on the phase voltage instruction value after the correction by the correction unit.

Abstract: A first terminal of a protection element of a control unit is connected to a wire between a motor and a switching element, and a second terminal is directly connected to a ground-side wire shared by a controller and the switching element. The protection element has a normal-condition-OFF-type switch including a movable contact and a fixed contact. When an overheating caused by the switching element attains a predetermined temperature or higher, the movable contact and the fixed contact are closed to short-circuit the first terminal and the second terminal, and an electric current is branched to the protection element side to reduce an electric current flowing into the switching element, and the control unit is shifted to a temperature range safe from the overheating caused by the switching element without stopping a cooling system.

Abstract: Provided is a linear motor device which is compact even when a stroke is increased, which can reduce heat generation, and which can eliminate damping force caused by circulating current. The linear motor device includes a linear motor that includes a movable member having a plurality of fields and a stator in which a plurality of armatures including polyphase coils are arranged in line in the moving direction of the movable member, and a controller that sequentially outputs control commands to current amplifiers respectively connected to the armatures in accordance with the relative position of the movable member. The controller selectively outputs the control commands to only the current amplifiers corresponding to the armatures which are opposite the movable member such that the armatures are positioned within a range corresponding to the length in the moving direction of the movable member.

Abstract: The alternating voltage control apparatus which is inserted serially between an alternating-current power source and an inductive load and which controls adjustment of load voltage of the inductive load with a magnetic energy recovery switch reduces a voltage burden of a reverse conduction type semiconductor switch within the magnetic energy recovery switch and a capacitor and controls voltage to be supplied to the inductive load with a small advancing amount of a phase of current to be supplied to the inductive load.

Abstract: A head up display device for a vehicle includes a display; an optical system having a reflecting mirror; a stepping motor; and a control system having a determining device, a micro-step control device, and a forcible control device. The determining device determines whether an adjustment command for micro-step control is given. The micro-step control device performs the micro-step control as long as the determining device determines that the command for the micro-step control is given. The forcible control device forcibly controls a drive signal such that an electrical angle changes to a stabilizing point. When determination made by the determining device switches from determination that the command is given to determination that the command is not given, the forcible control device forcibly controls the drive signal, provided that the electrical angle as of the time of the determination that the command is not given is shifted from the stabilizing point.

Abstract: A variable-frequency drive that includes a DC power supply bus with a positive line and a negative line, and an inverter module powered by the DC bus for supplying a variable voltage to an electric load. The inverter includes a first DC/DC converter including output terminals connected in series on the positive line of the DC bus, a second DC/DC converter including input terminals connected between the positive line and the negative line of the DC bus, a filtering capacitor connected in parallel to the input terminals of the first converter and to the first output terminals of the second converter, and an electric power storage module connected in parallel to the second output terminals of the second converter.

Abstract: It makes possible to control a movable element to be smoothly movable by a sensor-less vector control in an equal speed area, without using a position sensor, and possible to perform a stop control and control it in a low speed area.