Abstract: An electric motor includes an arrangement of windings provided for driving the rotor, with the windings being connected to an energy source to develop torque which drives the rotor. The electric circuits of corresponding ones of the windings each have a potential point, the voltage (UL, UG) of which is supplied to an evaluation unit via an adaptation device. The adaptation device can be operated in two switchable adaptation stages and is connected to a drive circuit that operates in dependence upon the rotational position of the rotor. The drive circuit switches the adaptation device into the first stage having a high sensitivity or into the second stage having a low sensitivity in dependence upon the rotational position of the rotor of the motor, such that the number of required analog inputs at a microprocessor in the evaluation unit can be kept low.

Abstract: A control circuit (1) for an electronically commutated, direct current motor (M) without a collector with a semiconductor end stage (2) which is controlled by an electronic commutation control (4) via a driver stage (6) for the time-offset control of the stator coils (U,V,W) of the motor (M) for the purpose of producing a magnetic rotating field for a rotor depending on the rotor rotation position. Two redundant stall protection units (10, 12) monitor the motor (M) during operation for rotation of the rotor, whereby in the case of a determined stall situation, the first stall protection unit (10) deactivates the driver stage (6) and the second stall protection unit (12) shuts off the supply voltage (UVCC) for the driver stage (6).

Abstract: The excitation overcurrent detection unit for the doubly-fed electric machine is provided with a function to determine an excitation current magnitude relationship among three phases. The firing pulse is held to on-state or off-state to cause the largest-current phase and the second-largest-current phase to charge the DC capacitor by the operation of diodes. The conduction ratio of the third-largest-current phase or minimum current phase is controlled according to the detected current value to protect against a possible short-circuit across the DC capacitor. When the voltage of the DC capacitor exceeds a preset value, the voltage is suppressed by operating active or passive power devices.

Abstract: Embodiments of the present disclosure relate to methods, systems and apparatus for generating voltage command signals for controlling operation of an electric machine. The disclosed embodiments can reduce current and torque oscillation, which can in turn improve machine efficiency and performance, as well as utilization of the DC voltage source.

Abstract: A circuit arrangement, especially for supplying an electromagnetic holding brake with a clocked supply voltage, includes a module for controlled provision of a clocked supply voltage for free-wheeling operation of the holding brake. The module has a switching unit for switching off the supply voltage for braking operation. A free-wheeling diode and a suppressor diode are connected in parallel to an inductance of the holding brake, with the free-wheeling diode being effective in free-wheeling operation only and the suppressor diode being effective in braking operation only.

Abstract: A drive control device includes a signal generation unit, a position detection unit, a speed detection unit, and a drive control unit. Based on at least one light receiving signal inputted from at least one light receiving unit of an encoder, the signal generation unit digitizes the at least one light receiving signal to generate at least one non-interpolated digital encoder signal, and digitizes and interpolates the at least one light receiving signal to generate at least one interpolated digital encoder signal. The position detection unit detects a position of an object based on the at least one interpolated digital encoder signal. The speed detection unit detects a speed of the object based on the at least one non-interpolated digital encoder signal. The drive control unit performs a drive control of the object based on the above-detected position and speed.

Abstract: A renewable energy source is converted into a desired DC voltage that is delivered to a DC motor controller of a permanent magnet motor. A micro controller monitors the amount of supplied renewable DC having the desired DC voltage, which is delivered to each phase of the motor by turning on FET switches on demand. If the renewable DC available at a given instant is not adequate to power a particular phase of the motor, then the micro controller turns on backup FET switches that are part of an independent drive circuit that is in parallel with drive circuits of the renewable DC power circuit, to deliver to the motor line DC, which is produced from an AC supply that has gone through an AC to DC converter. Once charged, the renewable DC power will power the next available phase of the motor.

Abstract: The present invention relates to the antenna control field, and discloses a device for remotely controlling a multi-band antenna and a multi-band antenna system. The device for remotely controlling a multi-band antenna includes an antenna panel 100, where the antenna panel 100 is disposed with a control board 101 and at least two motor modules 102; each of the motor modules 102 includes a connector 1022, each of the motor modules 102 electrically connects, via its connector 1022, to the control board 101 to receive a control command sent by the control board 101. In the embodiments of the present invention, an adjustment to a downtilt of a multi-band antenna may be implemented, and an occupied space of the antenna panel and a cost for adjusting a downtilt may be reduced.

Abstract: A wireless motor control system includes a connection device and a remote control device. The connection device has a pair of motor connection terminals and a pair of power connection terminals for connecting a motor and an electric power source. The connection device contains a second control circuit board having a processing element, and the processing element has a digital identity for interconnecting the connection device with a control element of the remote control device to form a unique signal transmission channel, and a Zigbee transmission method complied with IEEE 802.15.4 standard forms a group control network. With a relay and a current detector installed in the connection device, the power of the motor is disconnected immediately when there is an over-current.

Abstract: There is provided an actuator in which an worm is rotationally driven by an electric motor, and in which an angular velocity of the electric motor is repeatedly fluctuated so that the rotation of the worm is carried out as if the worm is oscillated in the rotational direction thereof, to thereby decrease contact friction of the worm against a worm wheel, resulting in an improvement of an efficiency of force transmission of the worm gear mechanism.

Abstract: In an electric power steering system, a back electromotive force constant is calculated on the basis of a steering angular velocity and an estimated induced voltage. Then, a rotation angular velocity of a motor is calculated as an estimated rotation angular velocity on the basis of a motor current, a motor voltage, the back electromotive force constant and a motor resistance.

Abstract: The invention realizes a method for controlling an electric cylinder and a control system for the cylinder that can prevent a load for pressurizing from significantly exceeding a target load and can shorten the time for the pressurization. A servo controller 17 can set the speed of the rod 11 and a load for stopping Ps that is used for determining whether the rod 11 should be stopped so that the load for pressurizing Pm does not significantly exceed the target load Pt. The servo controller 17 drives the rod 11 under the position control mode and determines whether the load for pressurizing Pm that is detected by a load detector 13 is bigger than or equal to the load for stopping Ps.

Abstract: The electrical power steering apparatus 10 includes the 1st MOS-FET 13 and the 2nd MOS-FET 14 accommodating the 1st parasitic diode 15 and the 2nd parasitic diode 16 in the conducting path between the battery 100 and the motor driving circuit 11 and being connected in series at the opposite direction respectively, and the condenser 18 in an output side of the latter 2nd MOS-FET 14. The ECU 6 of the controller of the electrical power steering apparatus controls to turn on or off the 1st MOS-FET 13 and the 2nd MOS-FET 14 in accordance with the predetermined sequence after the ignition switch 17 is turned on, detecting the fault of the 1st MOS-FET 13, the 2nd MOS-FET 14 and the 1st parasitic diode 15 and the 2nd parasitic diode 16 on the basis of the output voltage from each of the 1st MOS-FET 13 and the 2nd MOS-FET 14.

Abstract: A drive device of the present invention includes a pair of drive switches, a first diode, a switching element, a current detection unit, a capacitor, a second diode, and a current control unit. The first diode, the switching element, and the current detection unit are arranged, in this order from one end of an armature in a motor, on a braking current path that is formed of the armature and a field winding in the motor when the pair of drive switches is in a brake position. The second diode is adapted to keep allowing a braking current to flow through the field winding when the switching element is in an off-state by directly connecting a partial path between the switching element and the current detection unit on the braking current path and the other end of the armature.

Abstract: A controller that controls ON/OFF of switching elements and opening/closing of an opening/closing unit based on currents detected by current detectors. The controller includes a fault detector that detects whether any of the switching elements has a short-circuit fault and outputs a signal indicating a detection result, an ON/OFF controller that sets one of the switching elements that constitutes a phase other than a first phase that involves the short-circuit fault to an ON operation state and outputs a signal for opening the opening/closing unit, and an opening/closing controller that opens an opening/closing unit connected to a third phase other than the first phase and the second phase in which one of the switching elements is set to the ON operation state by the ON/OFF controller.

Abstract: In a motor driving device, a driving switching element is connected in series with a motor between a power source and a ground, and operated by a PWM signal outputted from a control circuit. A return current path forming unit is connected in parallel with the motor to allow a return current when the driving switching element is turned off. A series circuit of a current flow restriction element and a switch is connected in parallel with the return current path forming unit. A disconnection determination unit prohibits output of the PWM signal and closes the switch of the series circuit when a voltage applied to the motor does not fluctuate according to the PWM signal, and determines the disconnection of the motor on condition that the voltage detected in that state indicates a change across a second threshold.

Abstract: Disclosed herein is a technique for controlling the torque of an electric motor driven vehicle. In the technique, the current speed of a drive motor, a speed boundary section, a target torque, a drive torque limit and a generation torque limit are input. The ratio of the current speed in the entire speed boundary section is calculated as a mixture ratio when the current speed is within the speed boundary section. A limit torque is calculated, reflecting the drive torque limit and the generation torque limit in the calculated mixture ratio. Of the limit torque and the target torque, the torque that is smaller in absolute value is determined as the final torque that is required of the drive motor.

Abstract: A motor driving apparatus includes a motor driving unit, a low-voltage source, a current detecting element, and an insulation resistance degradation determinator. The motor driving unit includes an inverter coupled between a positive DC bus line and a negative DC bus line of a DC power source. The inverter converts DC power into AC power to drive an AC motor. The low-voltage source is coupled between a ground and at least one of the positive DC bus line and the negative DC bus line. The current detecting element detects a closed circuit current flowing through a closed circuit of the low-voltage source, the AC motor, and a part of the inverter. The insulation resistance degradation determinator makes a comparison between the closed circuit current and a predetermined threshold, and configured to determine, based on the comparison, whether an insulation resistance of the AC motor is degraded.