20 results about "Electrical frequency" patented technology

This application discloses a motor control method, including: Step A: Alignment control of the rotor, then forced commutation operation of the rotor, and back EMF zero-crossing signal; if a preset number of back EMF zero-crossing signals are continuously detected according to the predetermined commutation sequence, then Step B is executed; Step B: Speed ​​loop closed-loop control of the motor, and after the rotor speed is accelerated to a preset starting speed, back EMF zero-crossing signal is detected; then Step C is executed; Step C: Whenever a back EMF zero-crossing signal is detected, during the period from the detection time of the currently detected back EMF zero-crossing signal to the next commutation time, the drive signal for the motor is stopped, and the electrical angle corresponding to each back EMF is adjusted through the phase-locked loop until the electrical frequency output by the phase-locked loop converges to a target electrical frequency range. Then, the motor is controlled by FOC, avoiding problems such as loss of synchronism and difficulty in starting the FOC sine wave when the motor load torque is large.

The invention relates to a heat dissipation filter device and an electrical frequency conversion cabinet, and relates to the field of heat dissipation devices, the heat dissipation filter device comprises a fan, a filter cartridge and a mounting assembly, the fan is used for inputting air into the filter cartridge, the filter cartridge is detachably connected to the mounting assembly, and the filter cartridge comprises a first annular end cover, a second annular end cover, filter cartridge cloth and a limiting hoop; mesh cylinders are fixed to the opposite faces of the first annular end cover and the second annular end cover, the two ends of the filter cylinder cloth are fixed to the outer sides of the two mesh cylinders in a wrapping mode, the first annular end cover is used for air of a draught fan to enter, the second annular end cover is blocked through the installation assembly, the limiting hoop hoops the middle of the filter cylinder cloth, and therefore the filter cylinder cloth is in a sandglass shape. A contraction section, a throat section and an expansion section are sequentially arranged in the filter cartridge cloth in the air inlet direction. The filtering period can be prolonged under the high-dust working condition.

A method and controller for controlling an axial flux machine are described, wherein alternating current supplied to multiple coils is injected as a compensating current to reduce the mechanical resonance components of the rotor. This compensating current is added to an orthogonal current (IA) as the rotor rotates within one or more speed ranges. q ) component and DC (I d The modulated current component is a modulation current component of at least one of the following components (when the alternating current is represented as a vectorized DC component). This modulated current component has: an electrical frequency that varies with the rotor speed within a frequency range between a first frequency and a second frequency, including a frequency substantially the same as the rotor's fundamental mechanical resonant frequency; and a phase that is different from the rotor's fundamental mechanical resonant frequency.

This invention discloses an online diagnosis and location method for generator rotor faults, belonging to the field of generator fault diagnosis technology. The method includes the following steps: S1, arranging a magnetic field sensor array to synchronously acquire the time-domain signal of the air gap magnetic field during operation; S2, performing spectrum analysis to extract the amplitude of the harmonic components at twice the electrical frequency; S3, online diagnosis of either a loose pole bolt fault or a mass imbalance fault; S4, when an online diagnosis of a loose pole bolt fault is made, a shutdown and turning operation is performed. By monitoring the signal strength of the magnetic field sensor located directly below the rotor and finding the point of maximum signal strength, the mechanical angle position of the loose pole is determined. This invention, based on a magnetic field sensor array arranged along the stator circumference and axis, extracts the spatial distribution characteristics of the harmonic amplitude at twice the electrical frequency and compares it with a threshold, enabling accurate online differentiation between loose pole bolt faults and mass imbalance faults, greatly improving the accuracy of online diagnosis.

A fiber optic sensing system is disclosed for improved accuracy analysis of an ESP operating downhole. The fiber optic system continues to operate and transmit data after a down hole power cable has been grounded and cannot transmit data over the downhole power cable. Analysis of harmonics and power quality up to the two hundredth harmonic are measured and analyzed. Transient peaks along the complete cable run are measured and analyzed along with measures of electrical frequency; and 3 Phase Voltage & Current at the motor.

This application discloses a motor drive control method, apparatus, device, storage medium, and product, relating to the field of motor control technology. The disclosed motor drive control method includes: acquiring current motor parameters of a target vehicle under current operating conditions, wherein the motor parameters include an electrical frequency; if the electromagnetic force fluctuation frequency generated by the current harmonic frequency corresponding to the electrical frequency is within the resonant frequency range of the target vehicle, determining a target synchronous modulation scheme corresponding to the electrical frequency from a preset set of synchronous modulation schemes; and controlling the drive circuit of the target vehicle based on the target synchronous modulation scheme. This application uses a flexible synchronous modulation scheme instead of an asynchronous modulation method to avoid increasing the switching frequency, thereby reducing the losses in the new energy vehicle motor drive system.

The application discloses a high-power charging pile thermal runaway monitoring method and a protection system thereof, relates to the technical field of high-power energy supplementing infrastructure for new energy vehicles and extreme thermal physical safety control, and aims to solve the technical defects of lagging thermal runaway monitoring and passive protection of the existing high-power charging pile. The monitoring method discloses the single dependence on the terminal temperature lagging representation, constructs an early microcosmic evolution detection system of multi-physical field coupling, realizes early and accurate identification of thermal runaway precursors through the synergistic detection of three dimensions of electrical frequency domain micro stress detection, cooling medium micro boiling acoustic detection and interface escaping gas concentration feedforward detection, and combines multi-dimensional state fusion threshold determination. The protection system corresponds to the above monitoring method, is composed of a hybrid type ultra-fast breaking module, an active phase change flooding fire extinguishing module, a gun end forced separation module and a comprehensive decision-making master control hub, and realizes graded active protection in different stages of thermal runaway.

This invention, based on VMD-SST, is a method for diagnosing weak inter-turn short-circuit faults in dual-phase three-phase motors under varying operating conditions. It belongs to the field of motor fault diagnosis technology. The invention addresses the problems of traditional methods' difficulty in accurately tracking time-varying fault characteristics under varying operating conditions, the difficulty in extracting weak fault signals due to the harmonic suppression characteristics of dual-phase three-phase motors, and the easy submersion of single-turn short-circuit faults by noise under low signal-to-noise ratio. This invention establishes a fault mathematical model, deriving the mechanism that a fault will generate 4th and 6th times the electrical frequency harmonic components in the fifth harmonic space. Based on this, the d-axis and / or q-axis currents in the fifth harmonic space are selected as characteristic signals. Variational mode decomposition is performed on the characteristic signals to select the target mode from multiple mode components. Synchronous compressed wavelet transform is performed on the target mode to obtain a time-frequency diagram. Time-frequency ridges are extracted; if the ridge frequency is 4th and / or 6th times the electrical frequency, an inter-turn short-circuit fault is determined, and the ridge start time is taken as the fault occurrence time.

This invention relates to the field of mechanical sensor technology, providing a method and system for measuring the force on a non-permanent casing based on mechanical sensors. The method includes: placing corresponding equipment at the core location, the pressure location, and the cable burial location; converting the collected microvolt-level analog signals into digital electrical frequency bands; providing digital mechanical evidence to verify the buckling and tear resistance of the single-sided open-closed casing during the pressing stage when it is pressed into soft strata by a pile driver while the casing remains closed; achieving dynamic monitoring of fluid-solid balance during the borehole dredging and concrete pouring stages; automatically outputting electronic commands to reach the optimal demolding and pull-out critical point in the later stage of concrete pouring; and responding to the electronic commands. Specifically, this invention relates to a special sensor concealed deployment architecture for full life-cycle force monitoring of single-sided open-closed ultra-long temporary casings for cast-in-place piles in weak or soft soil, and measurement and evaluation based on electrical digital inflection point determination.

A downwind starting method for a permanent magnet synchronous motor without a back electromotive force sampling circuit includes utilizing a back electromotive force generated by a rotating magnetic field that is generated through downwind rotation of the permanent magnet rotor before starting the permanent magnet synchronous motor cutting the plurality of phase windings of the stator assembly to control a lower switch transistor of one of the phase windings to be turned on while turning off lower switch transistors of the remaining phase windings, detecting whether a current is generated, and recording time when the current is generated; repeating the above operations until time when a current is generated for each phase winding is obtained; summing the time when the current is generated for each phase winding to obtain an electrical cycle, and calculating an electrical frequency of the motor by using the electrical cycle; and utilizing the electrical frequency and the time when the current is generated for each phase winding to calculate a corresponding position angle of the permanent magnet rotor respectively as a starting position of the motor. Through the method, back electromotive force sampling circuits are reduced, no special treatment is needed for hardware, PCB routing is more simplified, and manufacturing costs are reduced.

A method of damping drivetrain oscillations in a wind turbine power system connected to an electrical grid includes receiving, via a drivetrain damping algorithm, an energy buffer power command for an energy buffer of the wind turbine power system. The method also includes modulating, via the drivetrain damping algorithm, the energy buffer power command in combination with providing rotor converter control commands that are sensitive to changes in electrical signals at a drivetrain frequency, wherein the electrical signals include at least one of total power injected into the electrical grid, an electrical angle, or an electrical frequency so as to dampen the drivetrain oscillations without directly controlling power or torque on a generator of the wind turbine power system.

The invention discloses an electrical frequency conversion cabinet, which relates to the technical field of frequency conversion cabinets and comprises a bottom cabinet body, a top cabinet body, a cross-shaped cross beam and a lifting cabinet, the top of the bottom cabinet body is communicated with the bottom of the top cabinet body and is divided into four storage spaces by a cross-shaped cross beam; a mounting plate for mounting a frequency converter, a reactor and a filter assembly is fixedly mounted in the bottom cabinet body; a lifting cabinet is arranged in the top cabinet body and driven by a lifting driving piece to ascend and descend, and the lifting cabinet and the mounting plate are arranged in a staggered mode in the transverse projection direction. According to the invention, the space utilization rate of the overall layout is optimized, and the safety and performance of equipment are enhanced.

The invention relates to a method for operating an electronically commutated, multiphase electrical machine (3), comprising the following steps: - Operating the electrical machine (3) by setting phase voltages, which are adjusted using pulse width modulated control;- Implementing a method for asymmetric power loss generation depending on a switching criterion in a first operating mode or a second operating mode, wherein the first operating mode provides for the imprinting of asymmetric phase currents with a second harmonic of the electrical frequency (S4), wherein the second operating mode provides for a shift of the offset voltage by omitting switching operations of the pulse-width modulated control (S3), wherein the first operating mode is selected for operation in a lower speed range of the electric machine (3) and the second operating mode for operation in a higher speed range of the electric machine (3) (S2).;

An air compressor (101) having an electrical frequency converter (165) that controls an air compression assembly (122), where the electrical frequency converter (165) is located inside the air compressor (101) and housed in an electrical cabinet (123). During an unloading phase and a stop phase of the air compressor (101), the pressure within the pressure vessel (121) is maintained at an elevated level, thereby reducing the time and power required to return the air compressor (101) to a full load state.

A method for operating a grid-following inverter-based resource (IBR) connected to a power grid. The IBR has a controller. The method includes receiving, via the controller, a frequency feedback signal representative of an electrical frequency of the power grid. The method also includes determining, via the controller, a power support signal based on applying a function to the frequency feedback signal. The power support signal is configured to emulate grid-forming control for at least one of inertial power, phase jump power, and droop power in response to at least one of the frequency feedback signal and a phase jump of the power grid. The method further includes determining, via the controller, an active power command signal for the IBR based on the power support signal and a power reference signal. In addition, the method includes controlling, via the controller, the IBR based, at least in part, on the active power command signal so as to emulate grid-forming control.

This application discloses a resonance suppression method, a motor controller, an automobile, a storage medium, and a program product, relating to the field of new energy vehicle technology. The resonance suppression method includes: acquiring the electrical frequency of the motor; modulating the fundamental wave corresponding to the electrical frequency based on a target harmonic to obtain a target pulse signal with symmetrical characteristics, wherein the target harmonic is at least one harmonic of any order among multiple harmonics corresponding to the fundamental wave, and the frequency of the target harmonic is within a preset resonant frequency range; controlling the motor operation based on the target pulse signal to reduce electromagnetic force fluctuations generated by the target harmonic, thereby achieving resonance suppression. This application solves the technical problem that current resonance suppression methods still produce resonance, and achieves resonance suppression.

The invention discloses a control method and system for improving the torque precision of a permanent magnet synchronous motor for a vehicle, and relates to the technical field of electric drive control, and the method comprises the steps: carrying out the secondary filtering of a three-phase current signal after hardware filtering processing, carrying out the analysis of the three-phase current signal after secondary filtering, and obtaining a three-phase current harmonic distortion rate; determining an optimal secondary filter coefficient by adjusting the secondary filter coefficient and combining the three-phase current harmonic distortion rate; acquiring an electrical frequency; generating a phase delay compensation amount, and combining the phase delay compensation amount with the motor position data to generate a compensated control angle; converting the three-phase current signal after secondary filtering to generate a compensated dq-axis current feedback value; and inputting the compensated dq-axis current feedback value and the calibrated dq-axis current instruction value into a PI controller for deviation adjustment, converting an adjustment result into a three-phase voltage through a three-phase inverter, and outputting the three-phase voltage to control the permanent magnet synchronous motor.

A fiber optic sensing system is disclosed for improved accuracy analysis of an ESP operating downhole. The fiber optic system continues to operate and transmit data after a down hole power cable has been grounded and cannot transmit data over the downhole power cable. Analysis of harmonics and power quality up to the two hundredth harmonic are measured and analyzed. Transient peaks along the complete cable run are measured and analyzed along with measures of electrical frequency; and 3 Phase Voltage & Current at the motor.

This invention discloses a method for starting a permanent magnet synchronous motor (PMSM) with the wind without a back EMF sampling circuit. Before starting the PMSM, the rotating magnetic field generated by the PSM rotor rotating with the wind cuts several phase windings of the stator assembly, generating a back EMF. This back EMF controls the lower transistor of one phase to conduct while the lower transistors of the remaining phases are turned off. The method detects whether current is generated and records the time of current generation. This process is repeated until the time of current generation for each phase is obtained. The times of current generation for each phase winding are added together to obtain an electrical cycle time. The electrical frequency of the motor is calculated from this electrical cycle time. The position angle of the corresponding PSM rotor is calculated using the electrical frequency and the time of current generation for each phase winding as the starting position of the motor. This method reduces the need for a back EMF sampling circuit, requires no special hardware processing, simplifies PCB layout, and reduces manufacturing costs.

A method for protecting a grid-forming inverter-based resource connected to a power grid from power deviations. The method includes receiving a first feedback signal for a first parameter. The first parameter being one of a power of the grid-forming inverter-based resource or an electrical frequency of the power grid. The method also includes determining a first parameter deviation signal based on a comparison between the first feedback signal and a threshold for the first parameter. Further, the method includes determining a scale factor configured to adjust sensitivity of at least one of a power or frequency protection for the grid-forming inverter-based resource based on a second parameter. The second parameter being another of the power of the grid-forming inverter-based resource or the electrical frequency of the power grid. Moreover, the method includes determining a compensated deviation signal based on the scale factor and the first parameter deviation signal. Furthermore, the method includes determining an accumulated deviation signal over time based on the compensated deviation signal. In addition, the method includes tripping the grid-forming inverter-based resource when the accumulated deviation signal exceeds a trip threshold.