44results about "Power factor control" patented technology

A motor power source regulation circuit, a control method and an electronic device are provided. The motor power source regulation circuit includes a power factor correction circuit, an isolation circuit, a first power source conversion circuit, a second power source conversion circuit and a control circuit. The isolation circuit includes a first switch sub-circuit and an isolation transformer. The power factor correction circuit regulates an AC input signal to a first DC signal. The first switch sub-circuit converts the first DC signal to a first AC signal. The isolation transformer converts the first AC signal to two or more second AC signals. The first power source conversion circuit converts the second AC signal to a DC drive signal and outputs it to a DC motor. The second power source conversion circuit converts the second AC signal to an AC drive signal and outputs it to an AC motor.

Disclosed herein is a power control system of a processing plant, the power control system comprising: a control system configured to determine power characterisation data of the power supply to one or more loads in the processing plant; a power factor correction system configured to apply a power factor correction to the power supply; a vibration sensor system configured to generate vibration data of one or more locations in the processing plant and to transmit the vibration data to the control system; and a flowrate sensor system configured to generate flowrate data of fluid in one or more conduits in the processing plant and transmit the flowrate data to the control system; wherein the power factor correction applied to the power supply by the power factor correction system is generated in dependence on the determined power characterisation data and at least one of the vibration data and flowrate data.

This application discloses a servo driver and an industrial robot control cabinet. The servo driver, applied to the industrial robot control cabinet, includes: a drive control module, communicatively connected to the industrial robot control cabinet, for receiving instructions from the industrial robot control cabinet and generating control signals based on those instructions; and a drive power module, connected to both the drive control module and a motor, for receiving the control signals and driving the motor based on them. The drive power module has a first interface, through which the DC bus module of the industrial robot control cabinet is connected to the drive power module. The drive power module obtains DC bus power to drive the motor. This approach reduces safety risks and lowers overall costs.

The invention discloses a power factor compensation circuit and a household electrical appliance, the circuit comprises a switching device, a load circuit and a controller, the controller is configured to obtain a duty ratio value of a pulse width adjustment signal, and calculate a duty ratio value threshold according to a power supply voltage phase and a preset attenuation coefficient; according to the duty ratio value threshold value, carrying out limited shrinkage correction on the duty ratio value; and controlling the switching device to perform periodic on-off according to the duty ratio value after the limiting and shrinking correction. According to the technical scheme, when the power factor compensation circuit is started, the power factor compensation circuit cannot cause current overload.

An exemplary power conditioning method and system are disclosed using a power converter in combination with a diode bridge rectifier and a series transformer in which the power converter is configured to inject VARs to a high-speed rotating machine to compensate for the machine reactance. By injecting VARs into the machine using the power converter through the series transformer, the power converter can be fractionally rated, in terms of power rating, to a lower power rating which would otherwise have to be higher due to the reactance requirements due to its high-frequency input. And additionally, because of the lower power rating, the transformer can be beneficially rated for the corresponding power level of the machine. The operation of the diode bridge rectifier and a transformer does not add to the complexity of the control of the system or that of the power converter.

A dual inverter drivetrain having an energy storing fuel cell integrated into an electric vehicle is disclosed. A method of operating the dual inverter drivetrain using a power sharing control approach is described, which allows the key requirements of a fuel cell to be achieved without compromising the dynamic performance of the electric vehicle drive system. In particular, the ability of this control approach to ensure unidirectional power transfer from the fuel cell even in the event of regenerative braking, and a slowly changing fuel cell power despite fast motor torque transients were exhibited.

The invention relates to an electric tool (1), in particular a hand-held electric tool, e.g. a polisher (1A), a grinder and / or a saw (1B), comprising a tool (2), an electric motor (3) for driving the tool (2), and a control unit (4) for controlling the electric motor (3), the electric tool (1) being designed to be connected to a mains voltage (V1) and comprising a rectifier assembly (12) with a DC link (15) for supplying a DC link voltage (V2) on the basis of the mains voltage (V1), wherein the DC link voltage (V2) includes a plurality of successive voltage half-waves (16), the control unit (4) is configured to provide a torque curve (28) for controlling the electric motor (3), said torque curve (28) comprising a torque half-wave (36) for each voltage half-wave (16), and the control unit (4) is configured to ascertain a back electromotive force (34) induced in the electric motor (3), and if the back electromotive force (34) is greater than or equal to the DC link voltage (V2), to reduce a current torque value of the torque curve (28).

The invention provides a method for controlling a compressor system 1000, which is in particular part of a refrigeration cycle system, and which comprises an electrically operated compressor 1, configured for compressing a working medium, and a further electrical load 2. The compressor 1 in turn comprises an electric motor 11 for providing mechanical movement for compressing the working medium, an inverter 12, which supplies the electric motor 11 with single- or multi-phase alternating current, a power factor correction filter 13 (PFC), which supplies the inverter 12 with direct current and whose current input is connected to a mains connection point 2000 of an alternating current supplying mains power source for powering the compressor 1. The further electrical load 2 is connected to the same mains connection point 2000 as the power factor correction filter 13 for power supply.The procedure comprises operating the compressor system 1000 with electrical current from the mains power source, determining at least one current characteristic of the further consumer 2, which describes a current consumption of the further consumer 2, and controlling the power factor correction filter 13 of the compressor 1 at least as a function of the determined at least one current characteristic of the further consumer 2.

Enhanced network power factor corrective designs are presented that can use corrective devices that achieve long-term, operationally stable mechanical work. Embodiments can utilize reverse-winding induction motor designs with engineerable parameters and configurations for the reverse winding (13) in systems and through methods where an inductive motor (1) can present a current that leads voltage and a leading power factor (16) to correct other existing induction motors (8) in an initial network (9) or be optimized for a particular application. Designs also present a power factor correction that can present a variable correction without altering the character or physical capacitive value of an electrical correction component. Individual induction motors that have leading current and a leading power factor (16) can be provided to improve reverse winding induction motors. Progressive start controls (23) can also be used in a manner that limits inrush current to operational levels with passive current establishment control where reverse winding (13) effects can be used and perhaps even delayed to passively limit and even effect a current decrease while rotational acceleration continues after initial start transition.

A method for controlling a compressor system includes an electrically operated compressor for compressing a working medium, and a further electrical load. The compressor includes an electric motor for compressing the working medium, an inverter supplying the electric motor with single- or multi-phase alternating current, a power factor correction filter (PFC) supplying the inverter with direct current and whose current input for supplying power to the compressor connects to a grid current source providing alternating current. For supplying power thereto the further electrical load connects to the same grid connection point as the power factor correction filter. The method includes operating the compressor system with electrical current from the grid current source, determining at least one current characteristic value of the further load, and controlling the power factor correction filter of the compressor at least in dependence of the determined at least one current characteristic value of the further load.

A control method for an electronically commutated fan is provided, including: calculating a frequency difference between an alternating direct current voltage and a phase signal; converting the frequency difference into a rotational speed command signal; performing modulation on the rotational speed command and the alternating direct current voltage to generate a frequency command signal; phase-adjusting a motor current to generate a phase-modulated current signal; calculating a current difference between the phase-modulated current and the frequency command; generating a pulse width modulation based on the current difference command; generating the phase signal and a plurality of motor control signals according to the pulse width modulation command and a Hall signal. The present invention also provides a control device for an electronically commutated fan, to be disposed between a rectifier and a motor of an electronically commutated fan, which can improve the power factor of the system.

An exemplary method and system for power conditioning using a combined diode bridge rectifier and series transformer power converter is disclosed, where the power converter is configured to inject VARs into a high speed rotating machine to compensate for its mechanical reactance. By using a power converter to inject VARs into the machine via a series transformer, the power converter can be rated slightly lower in terms of power rating than would otherwise be required to be rated higher due to reactance requirements from high frequency inputs. Furthermore, due to the lower power rating, the transformer can be beneficially rated for the corresponding machine power level. The operation of the diode bridge rectifier and transformer does not add any complexity to the system control or power converter control.

The embodiments of this application relate to a multi-motor integrated power circuit, a motor power control method and an electronic device; a power input conversion circuit converts a power input signal from a standby power source to a busbar power signal; a power factor correction circuit converts and superposes an AC input signal of the AC power source to / with the busbar power signal; a first isolation circuit converts the busbar power signal to an isolation output signal; a first switch sub-circuit converts the busbar power signal to a first AC signal; an isolation transformer converts the first AC signal to two or more second AC signals; a first power conversion circuit or an isolation transformer converts the isolation output signal or the second AC signal to a DC drive signal; a second power conversion circuit converts the isolation output signal or the second AC signal to an AC drive signal.

The utility model discloses a high-efficiency medical oxygen generator driver, which comprises a driving control board, a driving unit is arranged on the driving control board, the driving unit comprises a power supply input module, an MCU processing module, an inversion module and a synchronous motor, the power supply input module is used for supplying power to the MCU processing module, the inversion module and the synchronous motor, and the MCU processing module is used for supplying power to the inversion module and the synchronous motor. A power factor correction module is connected between the power supply input module and the MCU processing module, the MCU processing module is further electrically connected with the synchronous motor through an inversion module, the power factor correction module adopts a single-phase Boost PFC topology circuit to adjust the bus voltage of pulsating direct current to 380V, and when the inversion module outputs, the current phase is aligned with the voltage phase, so that the pulse direct current is output. The power supply input module comprises a power supply input interface and an EMI filtering and rectifying module which are connected in sequence. The structure improves the utilization rate of electric energy.

This application relates to the technical field of reactive power compensation, disclosing a reactive power compensation method, system, and storage medium based on an asynchronous motor and a capacitor. The method involves placing a liquid dielectric capacitor next to the asynchronous motor, connecting it to the starting circuit during startup, opening the injection and return solenoid valves, and adjusting the dielectric injection speed in a positive correlation with the motor speed. Once the injection volume reaches the target or startup is complete, injection stops and the state is switched. Injection can be adjusted by cooperating with a hydraulic coupler and a dielectric pump, or the motor can be reversed / linked with an air pump to recover the dielectric during shutdown. Alternatively, the opening and closing degree of the solenoid valve can be adjusted in a positive correlation with the target flow rate, and the return gas pipe pressure can be adjusted in a negative correlation with the target gas flow rate, or the coupling degree of the hydraulic coupler, the opening and closing degree of the solenoid valve, and the height of the return gas pipe inlet can be adjusted in a negative correlation. This method achieves harmonic-free soft start, power factor compensation to 1, avoids the risk of self-excitation during shutdown, simplifies the structure, and has low energy consumption.

According to the self-learning control method and system for voltage regulation and speed regulation of the crane, the triggering angle is obtained through the PID controller according to the speed instruction of a current user and the real-time motor rotating speed under the speed instruction; meanwhile, according to a speed instruction of a current user, the real-time motor rotating speed, the real-time stator current and the real-time stator voltage, a self-learning triggering angle is obtained; and an optimized triggering angle is obtained by combining the triggering angle, and the silicon controlled rectifier driving module is controlled, so that the crane is controlled. The silicon controlled rectifier driving module is controlled by optimizing the triggering angle, the risk caused by the abnormal rotating speed of the motor to the system can be avoided, and meanwhile, through data accumulation in a preset database, the stability and reliability of control over the crane can be further improved, the anti-interference capability is high, and the control precision is high. And factory unmanned operation of a voltage regulation and debugging technical route can be realized.

The present invention provides a method for continuous adjustment of the power factor in an induction motor driven by a frequency inverter with escalar or vetorial control, by the use of a system for advanced saving energy, comprising a proportional and integral controller (14), at least a selection switch (15) and a tracking module (16). The system tracks the best power factor value for a power factor reference, according to the needs of the induction motor at different operating points, and acts on the indirect regulation of the voltage applied to the stator windings of the motor induction for scalar control or acts as indirect regulation of magnetic flux for vector control, increasing in both types the efficiency of a motor due to the successively adjustments in the power factor.

This disclosure proposes a motor control system, motor control method, device, and storage medium, relating to the field of motor control technology. The system includes: a detection module, an active power compensation module, a stator voltage calculation module, and a drive module. The detection module detects the current and voltage of the motor in a two-phase stationary coordinate system and outputs the current and voltage to the active power compensation module and the stator voltage calculation module, respectively. The active power compensation module determines the compensation electrical angular velocity based on the current and voltage. The stator voltage calculation module determines the current stator voltage based on the current and voltage. The drive module determines the voltage in the two-phase stationary coordinate system at the next moment based on the current reference electrical angular velocity, the compensation electrical angular velocity, and the stator voltage, and drives the motor based on the voltage in the two-phase stationary coordinate system at the next moment. It has low cost and strong versatility, improving the efficiency of motor control.

The invention relates to a device (13) and a method for operating an electric motor (12). The device (13) has a preferably passive rectifier circuit (25) and a controllable inverter circuit (31). A desired current waveform or current profile (wf) is specified for at least one phase (iv1, iv2, iv3) of the supply current (iv). Based on vector control of the electric motor (12), a first rotor current (id) can be determined in a rotor-fixed coordinate system, wherein the first rotor current does not influence the mechanical power (Pm) of the electric motor (12). Based on the rotor current (id), one or more control signals (b1 to b6) for controlling the inverter circuit (31) can then be determined in a control circuit (33), and the inverter circuit (31) can be controlled accordingly, resulting in the desired current profile (wf) for the respective current(s).

To provide an improved power tool. [Solution] An electric power tool having a tool, an electric motor for driving the tool, and a control unit for controlling the electric motor, wherein the electric power tool is configured to be connected to a power supply voltage and includes a rectifier device having an intermediate circuit for providing an intermediate circuit voltage based on the power supply voltage, the intermediate circuit voltage having a plurality of voltage half-waves 16 successive to one another, the control unit is configured to provide a torque transition for control of the electric motor, the torque transition including a respective torque half-wave for each voltage half-wave 16, and the control unit is configured to detect a reverse voltage 34 induced in the electric motor and reduce a current torque value of the torque transition in response to the reverse voltage 34 being equal to or greater than the intermediate circuit voltage.

To provide a control apparatus and a robot system that effectively utilize regenerative electric power in a simple configuration.SOLUTION: The control apparatus includes: a drive circuit unit to which regenerative electric power from a motor is input through a plurality of input / output terminals; a discharge resistance unit which is connected in parallel to the drive circuit unit, and to which the regenerative electric power is input from the drive circuit unit, and which consumes electric power when a voltage value of the regenerative electric power exceeds a threshold value; a second converter circuit unit which is connected in parallel to a first converter circuit unit, converts an alternating current being input through the terminals, into a direct current, and outputs the direct current; a first step-down circuit unit which steps down a voltage of the current being output from the second converter circuit unit, and outputs the stepped down voltage; an energization control circuit unit which is actuated by the direct current being output from the first step-down circuit unit and controls the drive circuit unit; and a regenerative electric power supply unit which is connected to the discharge resistance unit, and has a regenerative diode outputting a direct current of the regenerative electric power to the first step-down circuit unit.SELECTED DRAWING: Figure 3A

The invention relates to a device (13) and a method for operating an electric motor (12). The device (13) has a preferably passive rectifier circuit (25) and a controllable inverter circuit (31). A desired current waveform or current profile (wf) is specified for at least one phase (iv1, iv2, iv3) of the supply current (iv). Based on vector control of the electric motor (12), a first rotor current (id) can be determined in a rotor-fixed coordinate system, wherein the first rotor current does not influence the mechanical power (Pm) of the electric motor (12). Based on the rotor current (id), one or more control signals (b1 to b6) for controlling the inverter circuit (31) can then be determined in a control circuit (33), and the inverter circuit (31) can be controlled accordingly, resulting in the desired current profile (wf) for the respective current(s).

The present disclosure may provide an air conditioner comprising an outdoor unit and an indoor unit. The outdoor unit or the indoor unit may include a power conversion device for converting alternating current (AC) power into direct current (DC) power. The power conversion device may include a rectification unit for converting an AC voltage into a DC voltage, and a power factor correction (PFC) circuit for boosting the DC voltage and including a phase estimator. The phase estimator may remove harmonic noise from a grid voltage signal by using a first low pass filter (LPF), remove a DC offset of an α-axis signal or a β-axis signal by using a second LPF included in a second-order generalized integrator (SOGI) filter, and generate a final α-axis signal and a final β-axis signal by using at least one multiplier and at least one integrator.

The present disclosure provides an air conditioner for improving a power factor. The air conditioner comprises: an inverter used to drive a motor; a load including the inverter; a power conversion circuit including a rectifying circuit, which rectifies an input alternating current voltage so as to generate a direct current voltage, and a power factor correction circuit, which supplies an output direct current voltage to the load on the basis of the direct current voltage; and a processor for power factor control of the power conversion circuit. The air conditioner may comprise: a phase estimator for acquiring phase information of the input alternating current voltage; a voltage controller that generates, on the basis of the output direct current voltage and a reference voltage, a first control signal for controlling the magnitude of the output direct current voltage; a partial switching controller that generates setting information for setting a switching period of a switch included in the power factor correction circuit; and a current controller that generates, on the basis of an input current of the power factor correction circuit and a reference current, a second control signal for controlling the switch in the switching period. The reference current can be generated on the basis of the phase information, the first control signal and the setting information.

The embodiment of the invention provides a power factor compensation circuit. The circuit comprises a rectification module; a switching device; a load circuit; wherein the load circuit comprises a motor; the controller is electrically connected with the control end of the switching device and the load circuit, and the controller is configured to execute the following steps: inputting a control signal to the control end of the switching device, so that the switching device is switched on based on the control signal; determining whether the motor enters a weak magnetic area according to the operation parameters of the motor in the load circuit; if it is determined that the motor enters the flux-weakening area, determining a target duty ratio corresponding to the control signal based on flux-weakening current of the motor in the flux-weakening area; and adjusting a control signal input to the switching device according to the target duty ratio. According to the technical scheme, the time point when the switching device enters the over-temperature state where the input voltage of the motor cannot be increased can be delayed, so that the overall efficiency of the power factor compensation circuit is improved.

A power factor control apparatus includes: a phase detection unit configured to detect the phase of an output signal outputted from an inverter, which was originally used to supply electric power to a first electric power supply target, to a second electric power supply target that is different from the first electric power supply target and connected with the inverter and an inverter control apparatus for controlling the inverter; a correction amount calculation unit configured to calculate a phase correction amount based on a power factor command value that is a power factor required by the second electric power supply target; and a correction processing unit configured to generate, based on the phase detected by the phase detection unit and the phase correction amount calculated by the correction amount calculation unit, a power factor control signal for controlling the power factor of electric power supplied to the second electric power supply target and output the generated power factor control signal to the inverter control apparatus.

A muti-motor integrated power circuit includes: a power input conversion circuit configured to convert a power input signal from a standby power source to a busbar power signal; a power factor correction circuit configured to convert and superpose an AC input signal of the AC power source with the busbar power signal; a first isolation circuit configured to convert the busbar power signal to an isolation output signal; a first switch sub-circuit configured to convert the busbar power signal to a first AC signal; an isolation transformer configured to convert the first AC signal to at least two second AC signals; a first power conversion circuit or an isolation transformer configured to convert the isolation output signal or the second AC signal to a DC drive signal; and a second power conversion circuit configured to convert the isolation output signal or the second AC signal to an AC drive signal.

The present disclosure refers to a device as well as a method for operating an electric motor. The device has a preferably passive rectifier circuit and a controllable inverter circuit. A desired current form or a desired current progress for at least one phase of the supply current is preset. Based on a vector closed-loop control of the electric motor a first rotor current in a coordinate system fixed to the rotor can be determined, wherein the first rotor current does not influence the mechanical power of the electric motor. Based on the rotor current id then one or more control signals for controlling the inverter circuit can be determined in a control circuit and the inverter circuit can be controlled accordingly, wherein the desired current progress for the concerned current or the concerned currents result.