1362results about "Multiple ac dynamo-electric motors control" patented technology

An electric driven hydraulic fracking system is disclosed. A pump configuration includes the single VFD, the single shaft electric motor, and the single hydraulic pump mounted on the single pump trailer. A controller associated with the single VFD and is mounted on the single pump trailer. The controller monitors operation parameters associated with an operation of the electric driven hydraulic fracking system as each component of the electric driven hydraulic fracking system operates to determine whether the operation parameters deviate beyond a corresponding operation parameter threshold. Each of the operation parameters provides an indicator as to an operation status of a corresponding component of the electric driven hydraulic fracking system. The controller initiates corrected actions when each operation parameter deviates beyond the corresponding operation threshold. Initiating the corrected actions when each operation parameter deviates beyond the corresponding operation threshold maintains the operation of the electric driven hydraulic fracking system.

An electric driven hydraulic fracking system is disclosed. A pump configuration includes the single VFD, the single shaft electric motor, and the single hydraulic pump mounted on the single pump trailer. A controller associated with the single VFD and is mounted on the single pump trailer. The controller monitors operation parameters associated with an operation of the electric driven hydraulic fracking system as each component of the electric driven hydraulic fracking system operates to determine whether the operation parameters deviate beyond a corresponding operation parameter threshold. Each of the operation parameters provides an indicator as to an operation status of a corresponding component of the electric driven hydraulic fracking system. The controller initiates corrected actions when each operation parameter deviates beyond the corresponding operation threshold. Initiating the corrected actions when each operation parameter deviates beyond the corresponding operation threshold maintains the operation of the electric driven hydraulic fracking system.

A multi-motor drive in which the resonance existing between one or more output filter capacitors of a current source inverter and an a.c. induction motor is reduced. The inverter features a switching pattern generator which controls the power switches of the inverter based on a reference current. A control loop, connected to the switching pattern generator, measures the load current or voltage and generates a nominal reference current based on an error therein; determines a damping current based on the voltage at the terminal; and determines the reference current supplied to the switching pattern generator by subtracting the damping current from the nominal reference current. The invention essentially simulates the use of a physical damping resistor connected in parallel with each output filter capacitor, but without the corresponding energy loss. This form of active damping control is also applied to a resonance mode existing between the input filter capacitors of a PWM-based rectifier and the system inductance of a power source.

The invention discloses an electric driving fracturing type power supplying semitrailer. The electric driving fracturing type power supplying semitrailer is characterized in that a high-voltage switch, a transformer and two rectifying unit sets are adopted to correspondingly drive a plurality of high-voltage converting units and a plurality of low-voltage converting units through common DC buses.The whole electric driving fracturing type power supplying semitrailer is small in size, compact in arrangement, and economic; the common high-voltage switch, the transformer and the rectifying unitsare adopted, so that the wiring of power supplying circuits can be reduced; the equipment quantity and investment output power can be decreased; and the use demand can be met.

A controller obtains a planned travel distance from a current position of a vehicle to a preset charging point from a car navigation system, and based on the obtained planned travel distance, sets upper and lower limit values for controlling SOC of an electric storage lower as it comes closer to the charging point. The controller controls the SOC of the electric storage such that the SOC is within the set upper and lower limits of SOC control.

A power output unit of the present invention sufficiently ensures the performance of a vehicle by sufficiently developing the performance of an engine without enlarging a motor. In a hybrid vehicle, a power requirement for the engine is set based on a vehicle speed and an accelerator opening degree. Usually, while giving priority to efficiency, an operation state of the engine is set based on a power requirement. Once the operation state of the engine is set, operation states of first and second motors are set based on a vehicle speed and a drive force. If the thus-set operation state of the first or second motor exceeds a threshold value, the operation state of the first or second motor is set so as not to exceed the threshold value. Based on the setting result and the power requirement, an operation state of the engine is set.

The present invention relates to an electric saw (1) being powered by an external power supply (200) through a multicore cable (6). The multicore cable (6) includes electrical wires (24, 25, 27) for supplying power to the motors (5, 12, 13) of the electric saw (1) and communication wires (26) for data communication between the electric saw (1) and the power supply (200). Two motors (12, 13) of the electric saw are three phase permanent magnet motors (12, 13), with an outer rotor (31) and an inner stator (30). Each of the two motors (12, 13) has three Hall Effect sensors (H1, H2, H3) located around the outer rotor (31).

An electric driven hydraulic fracking system is disclosed. A pump configuration includes the single VFD, the single shaft electric motor, and the single hydraulic pump mounted on the single pump trailer. A controller associated with the single VFD and is mounted on the single pump trailer. The controller monitors operation parameters associated with an operation of the electric driven hydraulic fracking system as each component of the electric driven hydraulic fracking system operates to determine whether the operation parameters deviate beyond a corresponding operation parameter threshold. Each of the operation parameters provides an indicator as to an operation status of a corresponding component of the electric driven hydraulic fracking system. The controller initiates corrected actions when each operation parameter deviates beyond the corresponding operation threshold. Initiating the corrected actions when each operation parameter deviates beyond the corresponding operation threshold maintains the operation of the electric driven hydraulic fracking system.

When an ignition key is turned ON, a control apparatus predicts the arrival time to a chargeable location (such as home). When the control apparatus determines that the expected arrival time is in the nighttime, it sets SOC control upper and lower limit values for an EV traveling-importance mode that are lower than SOC control upper and lower limit values for an HV traveling-importance mode, and controls an SOC of a battery based on the upper and lower limit values.

An automotive drive system and methods for making the same are provided. The system includes a three-phase motor and an inverter module. The three-phase motor includes a first set of windings each having a first magnetic polarity; and a second set of windings each having a second magnetic polarity that is opposite the first magnetic polarity. The first set of windings being electrically isolated from the second set of windings. The inverter module includes a first set of phase legs and a second set of phase legs. Each one of the first set of phase legs is coupled to a corresponding phase of the first set of windings, and each one of the second set of phase legs is coupled to a corresponding phase of the second set of windings.

A motor controller includes: a driver stage operable to provide voltage and current to a plurality of induction motors over a single power bus; and a control unit operable to monitor the current drawn from the driver stage and cause one or more of the induction motors to operate in a regenerative mode to supply current to at least one other of the induction motors when the current drawn from the driver stage exceeds a threshold.

A direct-current power supply (40) is connected between the neutral points of two three-phase coils (24, 26) of a 2Y motor (22) constituted of the windings of the two three-phase coils (24, 26), which are connected in Y-connection and wound on a same stator, and to which three-phase alternating current power is severally supplied with a phase difference of a shifted angle between the windings from two inverter circuits (30, 32) having a positive pole bus (34) and a negative pole bus (36) for common use. A capacitor (38) is connected between the positive pole bus (34) and the negative pole bus (36). The electric potential difference between the neutral points of the three-phase coils (24, 26) is made larger or smaller than the voltage of the direct-current power supply (40) through the switching control of the inverter circuits (30, 32). Thereby, the capacitor (38) can be charged or discharged. Consequently, an inverter input voltage can be adjusted within a wide range.

A power supply device for a vehicle includes a battery serving as a first electric storage device, a battery serving as a second electric storage device, a motor generator driving a wheel, a selection switch selecting one of the first and second electric storage devices and connecting the selected electric storage device to the motor generator, and a control device controlling switching of the selection switch in accordance with a state of charge of each of the first and second electric storage devices. In the case where the selection switch selects the first electric storage device, when charging is performed and the state of charge of the first electric storage device becomes higher than a first prescribed level, the control device instructs the selection switch to select the second electric storage device.

The present invention relates to an architectural window covering having a programmable electric motor. The programmable electric motor is housed within a roller for raising and lowenng the window covering, and includes dual stacked motors and light-transmitting control actuation buttons. In one embodiment an architectural window covering, composing a shade, a roller defining a bore coupled to the shade, and at least two motors axially aligned and electrically coupled in parallel and positioned at least partially in said bore and rotatably coupled to the roller is disclosed.

An image forming apparatus including at least one image bearing member configured to bear a toner image on a surface thereof, and a transferring member arranged close to or in contact with the at least one image bearing member and configured to rotate in substantially synchronism with the at least one image bearing member to transfer the toner image born on the at least one image bearing member onto a recording medium. The apparatus further includes at least one first motor rotating the at least one image bearing member, a second motor rotating the transferring member, and a control mechanism configured to control a rotation number of at least one of the at least one first motor and the second motor during at least one of rise and fall time periods with a command clock signal and a feedback signal in accordance with a predetermined velocity curve.

A power supply device for a vehicle includes a battery serving as a first electric storage device, a battery serving as a second electric storage device, a motor generator driving a wheel, a selection switch selecting one of the first and second electric storage devices and connecting the selected electric storage device to the motor generator, and a control device controlling switching of the selection switch in accordance with a state of charge of each of the first and second electric storage devices. In the case where the selection switch selects the first electric storage device, when charging is performed and the state of charge of the first electric storage device becomes higher than a first prescribed level, the control device instructs the selection switch to select the second electric storage device.

A electric motor drive apparatus comprising a voltage control unit performing voltage control processing that determines alternating-current voltage command values serving as command values of the alternating-current voltages to be supplied to the alternating-current electric motor and generates switching control signals for the inverter; and a control mode selection unit selecting a synchronous control mode in which a cycle of electric angle of the alternating-current electric motor is synchronized with a switching cycle of the inverter, or an asynchronous control mode in which the cycles are not synchronized with each other. Current detection processing is performed to detect currents flowing in coils of the alternating-current electric motor in every standard calculation cycle that is set to a half of a cycle of the carrier.

With the use of three inverter circuits controlled by a single processor, the controller of the motor-driving apparatus provides a rotation drum-driving motor, a compressor-driving motor and a blow fan-driving motor with a simultaneous sinusoidal-wave control. The configuration above offers stable sinusoidal-wave drive, reducing vibration noise of the rotation drum, the compressor and the blow fan.

DC / DC converter is connected directly to a main battery with no system relays intervening therebetween. The DC / DC converter drops and then supplies the voltage of a power supplied from the high voltage main battery to a subsidiary battery. A DC / DC converter control circuit receives a supply of the power from the main battery to control the dropping operation of the DC / DC converter. Even when the subsidiary battery goes dead, the DC / DC converter is responsive to a control signal outputted from the DC / DC converter control circuit using, as its power supply, the main battery, to perform a boosting operation, thereby quickly charging the subsidiary battery.

The present disclosure includes electrical motor / generator drive systems and methods that significantly reduce inverter direct-current (DC) bus ripple currents and thus the volume and cost of a capacitor. The drive methodology is based on a segmented drive system that does not add switches or passive components but involves reconfiguring inverter switches and motor stator winding connections in a way that allows the formation of multiple, independent drive units and the use of simple alternated switching and optimized Pulse Width Modulation (PWM) schemes to eliminate or significantly reduce the capacitor ripple current.

A control device that controls an electric motor drive device. The control device is configured with a first voltage control section that derives a modulation rate representing a ratio of an effective value of the voltage command values to the DC voltage and a voltage command phase. A second voltage control section generates a control signal for controlling the DC / AC conversion section on the basis of the modulation rate, the voltage command phase, and a magnetic pole position representing a rotational angle of a rotator of the AC electric motor. A computation cycle of the first voltage control section is set to be longer than a computation cycle of the second voltage control section.

A motor drive unit comprises a DC power source, a plurality of inverter circuits for converting the a power of this DC power source to an AC power, current detectors for detecting an output current of at least one of those plurality of inverter circuits and a controller for performing PWM control of those plurality of inverter circuits. This controller is constructed in a way to synchronize a PWM period of the plurality of inverter circuits, so as to drive a plurality of motors at once by means of those plurality of inverter circuits respectively.

Reactive power (VAR) consumption in a power plant or facility having synchronous machines is adaptively controlled in an automated manner. Electrical parameters of the plant are dynamically monitored during plant operation, and the overall plant power system is brought to an optimum operating point under control of a microprocessor-based power measurement system. The microprocessor-based power measurement system adaptively changes the excitation system of synchronous machines in the plant based on results of monitoring. The excitation systems of the synchronous machines may be adjusted to be constant bus voltage, constant reactive power, or constant power factor, according to optimum system performance requirements. The power measurement system also assists in avoiding problems in voltage regulation during increased load demand conditions, such as when starting large electrical motors or energizing large transformers in the system.

A hybrid automobile, wherein a second power source operated with less frequency can be forcibly operated. The hybrid automobile comprises a storage battery as a first power source. The hybrid automobile further comprises an engine and a motor generator or a fuel cell as the second power source. When the hybrid automobile is run by the first power source, a driver can change over an operation mode to a running by the second power source by operating an input device. The hybrid automobile further comprises a notification means for prompting the driver to operate the input device when the non-operating time of the second power source exceeds a predetermined time or longer. Furthermore, the hybrid automobile comprise a control means which, when the remaining amount of energy of the second power source is less than a predetermined amount, stops the changeover of the operation mode from a running by the first power source to the running by the second power source.

A power supply device for a vehicle includes a battery (B1) which serves as a first power storage device, a battery (B2) which serves as a second power storage device, a vehicle load, a selection switch (RY0) which selects one of the first and second power storage devices and connects the selected power storage device to the vehicle load, and a control device (60) which, when a current flowing through the selection switch (RY0) is larger than a prescribed value, controls the vehicle load so that the current flowing through the selection switch (RY0) is made smaller than the prescribed value, and switches the selection switch. Preferably, when the control device (60) switches the selection switch (RY0), the control device controls inverters (20, 30) to achieve a balance between electric power generated in a first motor generator (MG2) and electric power consumed in a second motor generator (MG1).

A variable speed drive is provided having a converter to convert an AC voltage to a DC voltage, a DC link to filter and store energy from the converter, and a plurality of inverters, wherein each inverter is configured to convert a DC voltage to an AC voltage to power a corresponding load connected to the inverter The converter is electrically connected to an AC power source, the DC link is electrically connected to the converter, and the plurality of inverters are electrically connected in parallel to the DC link. Each inverter of the plurality of inverters is configured to operate substantially independently of other inverters of the plurality of inverters.

A vehicle (100) includes a motor generator (MG) and an inverter (14) driving the motor generator (MG). A power source apparatus for the vehicle includes a battery (B) as an electric storage device, a step-up converter (12) stepping up a voltage of the electric storage device and supplying it to the inverter, and a controller (30) indicating a target step-up voltage in accordance with a target state of operation of the motor generator (MG) to the step-up converter (12). If it is determined that a current operation state signal of the motor generator (MG) is abnormal, the controller (30) increases the target step-up voltage to a maximum value. Preferably, the vehicle (100) further includes a resolver (20) detecting rotation speed of a rotor of motor generator (MG). The controller (30) determines that the operation state signal is abnormal if an output of the resolver (20) does not satisfy a prescribed condition.

A direct-current power supply (40) is connected between the neutral points of two three-phase coils (24, 26) of a 2Y motor (22) constituted of the windings of the two three-phase coils (24, 26), which are connected in Y-connection and wound on a same stator, and to which three-phase alternating current power is severally supplied with a phase difference of a shifted angle between the windings from two inverter circuits (30, 32) having a positive pole bus (34) and a negative pole bus (36) for common use. A capacitor (38) is connected between the positive pole bus (34) and the negative pole bus (36). The electric potential difference between the neutral points of the three-phase coils (24, 26) is made larger or smaller than the voltage of the direct-current power supply (40) through the switching control of the inverter circuits (30, 32). Thereby, the capacitor (38) can be charged or discharged. Consequently, an inverter input voltage can be adjusted within a wide range.

The maximum electrical power drawn from an electrical power source by a mining excavator comprising electric motors is reduced by supplying supplementary electrical power from an electrical energy storage unit. The input electrical power drawn by the mining excavator is cyclic. An upper limit is set for the electrical power drawn from the electrical power source. When the input electrical power drawn by the mining excavator exceeds the upper limit, electrical power is supplied by the electrical energy storage unit, such as an ultracapacitor bank. The ultracapacitor bank may be charged by the electrical power source during off-peak intervals. Electrical power generated by electrical motors operating in a regeneration interval may also be recaptured and stored in the electrical energy storage unit.

The invention discloses synchronization method for variable frequency speed control of multiple motors controlled by computer based on network, and relevant distributed control system (DCS). Through RS-232 / field control bus converter, and field control bus, PC carries out serial data communication to each frequency converter, as well as reading, calculating and rewriting operational characteristic parameters, and control parameters of each frequency converter. Thus, the method implements distributed control for synchronous operation of multiple motors, making linear speeds of multiple rollers equal or keep certain speed ratio so as to guarantee normal continuous processing. The invention simplifies system structure, reduces cost of equipment, raises reliability of system and level of control and management as well as saves energy etc.