40 results about "Electrical frequency" patented technology

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.

A controller for a permanent magnet synchronous motor includes a first control loop having a first filter. The first filter has a back-EMF voltage vector input, a magnetic flux vector output with a constant phase shift that is independent of motor speed, and an amplitude response that is inversely proportional to rotor electrical frequency. The first control loop is configured to: generate an adjusted magnetic flux vector from the magnetic flux vector output by the first filter and compensate for the constant phase shift introduced by the first filter; estimate the rotor electrical frequency from the adjusted magnetic flux vector; and feedback a filtered version of the rotor electrical frequency estimate to the first filter as an estimation of the rotor electrical frequency.

The invention provides a method for improving motor phase current rationality diagnosis coverage rate, an electric driving system, electronic equipment and a storage medium. The method for improving the motor phase current rationality diagnosis coverage rate comprises the steps that the electric frequency of motor phase current and the switching frequency of a power module are monitored in real time; wherein the power module is configured to trigger a sampling frequency of a generator phase current; and according to the electric frequency of the motor phase current and the switching frequency of the power module, judging whether the motor operates in a preset switching frequency area, and if so, increasing the switching frequency of the power module. According to the method, the sampling precision of the phase current can be improved, so that the motor phase current rationality (such as current amplitude rationality, deviation rationality and zero-crossing rationality) diagnosis coverage rate is remarkably improved, and the functional safety requirement of an electric vehicle is ensured; the method does not need to increase any hardware cost, and is easy to implement.

The present disclosure relates to a control device (40) for an electric vehicle (1), the electric vehicle comprising: a DC power supply (10); an electric motor (30); an inverter (20) that converts DC power supplied from the DC power supply (10) into AC power and outputs the AC power to the electric motor (30); and an inverter control unit (100) that controls the inverter (20) and controls the input voltage to the electric motor (30). When a predetermined high-frequency component is included in a parameter correlated with the input voltage, the inverter control unit (100) performs correction by adding a component that cancels the high-frequency component to the input voltage, and controls the electric motor (30) based on the corrected input voltage. Thereby, it is possible to reduce the multiple component of the electrical frequency.

The invention relates to a method (100) for controlling an inverter (260), wherein the inverter (260) converts a DC voltage into a multi-phase AC voltage in order to power an electric machine (270). The method comprises the following steps: determining (120) an electrical frequency (f_el) of the electric machine (270); determining (130) a target_switching frequency (f_p_s) for a pulse-width modulation, wherein the target_switching frequency (f_p_s) is synchronous with the determined electrical frequency (f_el) of the electric machine; specifying (140) a target_start angle (alpha_s) of a first voltage indicator of the pulse-width modulation in relation to the stator-fixed alpha axis, or to one of the basic voltage indicators; controlling (150) the inverter (260) by means of pulse-width modulation using the determined target_switching frequency (f_p_s) and the specified target_start angle (alpha_s).

The invention provides an electric working machine with a brushless motor. The brushless motor has a rotor and a stator. The rotor has a plurality of permanent magnets. The plurality of permanent magnets are arranged such that the same poles face each other in the circumferential direction of the rotor core, thereby forming a plurality of magnetic poles on the outer circumference of the rotor core in the circumferential direction thereof. The plurality of magnetic poles have 4m (m is a natural number) magnetic poles, and the stator has 3m slots. The rotor rotates at an electrical frequency of 1333 Hz or more. Therefore, the electric working machine provided with the brushless motor capable of realizing high-speed rotation and high output while suppressing large-scale is provided.

The present invention discloses a method for detecting phase loss in a variable frequency compressor. The method comprises the following steps: starting detection, initializing data, and setting the command electrical frequency to fref; sampling the three-phase current; performing principal component analysis on the three-phase current to determine if a phase loss has occurred; performing cross-analysis; and concluding whether a phase loss has occurred based on the cross-analysis results; and completing the detection. The method performs component analysis on the three-phase current using a Fourier analysis scheme. The analysis results are first subjected to principal component comparison analysis, then to pairwise cross-comparison analysis, and finally to DC quantity analysis, ultimately concluding whether a phase loss has occurred. The results are stable and applicable to both high and low current modes, eliminating the need for repeated threshold calibration, or even the need for threshold calibration at all.

Control device (200) for a variable gauge train for a train (100) with variable gauge which has a variable gauge in a gauge-changing section, wherein the device comprises: an inverter (2) for collectively controlling a torque of a plurality of main motors (104a-104d); and a voltage control unit (3) for controlling an output voltage of the inverter, wherein, if at least one of a plurality of axles (103a-103d) to be driven by the plurality of main motors is located within the track gauge change section and at least one of the axles is located outside the track gauge change section, the voltage control unit The reference frequency is treated as a value obtained by converting an average value of rotational frequencies of the axes located outside the track gauge change section into electrical frequencies of the main motors, and the reference frequency and a slip frequency command are added together to provide an output voltage frequency.

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.

Vibration / noise reduction device (100) for reducing vibration or noise of an electric compressor, the electric compressor (1, 1A) comprising: a rotating shaft (2); a compressor wheel (4) arranged on the rotary shaft (2); an electric motor (10) for applying a rotational force to the rotary shaft (2), the electric motor (10) comprising: a rotor (12) fixed to the rotating shaft (2); and a stator (14) arranged around the rotor (12) for applying the rotational force to the rotor (12) by an electromagnetic force, the vibration / noise reduction device (100) comprising: a detector (150) for detecting a frequency associated with a vibration of the stator (14); and a signal generator (102) for generating a vibration signal having a frequency of a predetermined integral multiple of an electrical angular frequency obtained from the frequency detected by the detector (150) and having a signal wave that dampens the vibration of the stator (14), and a vibrator (104, 104a, 104b) configured to vibrate the electric compressor based on the vibration signal generated by the signal generator (102); wherein the electric compressor further comprises: a motor housing (18) for accommodating the electric motor (10); and an inverter (50) for controlling an electrical frequency of an alternating current supplied to the stator (14), and wherein the inverter (50) is housed in an inverter housing space (26, 26A) formed within the motor housing (18), wherein the electric compressor (1, 1A) further includes a cover member (28) for covering an opening of the inverter housing space (26, 26A), and wherein the vibrator (104, 104a, 104b) is arranged on the cover element (28).

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.

The invention discloses a motor control method and an air conditioner, and relates to the field of motor control, the motor control method is applied to a motor control device, and the motor control device comprises a vector control module, a phase extraction module and a beat frequency suppression module. Inputting the direct current bus voltage to a phase extraction module to obtain a target power grid angle when the frequency of the ripple in the direct current bus voltage has a preset multiple relation with the power grid frequency and the frequency of the ripple and the electric frequency of a motor generate a beat frequency phenomenon; inputting the target power grid angle and the current sampling value under the rotating coordinate system into a beat frequency suppression module to obtain a harmonic compensation amount corresponding to the current sampling value; and injecting the harmonic compensation quantity into a current control loop in the vector control module to obtain a target modulation signal for controlling the motor. By means of phase locking and harmonic injection, the beat frequency component in the operation process of the motor is reduced, then the beat frequency of the electric frequency and the ripple frequency of the motor is restrained, and the rotating speed control stability of the motor is improved.

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.

An apparatus is provided that introduces rapidly spinning vortices in a fluid, including water. It incorporates a fluid system, or fluid source, with a vortex creation apparatus and a frequency generation device. The vortices prepare the fluid to have memorized electromagnetic frequency signatures of harmful materials erased, and a new, desirable signature introduced. The desirable frequency can be introduced though a number of means, such as an electrical frequency generator.

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.

An electronic circuit arrangement for an electric charging station and a method for configuring a an electrical frequency filter device of an electronic circuit arrangement are disclosed. The electronic circuit arrangement includes an electrical pilot contact and an electrical earth contact, to which an electric motor vehicle for forming an electrical communication connection are electrically connectable. An electrical oscillator, for generating a pulse width modulated electrical communication signal, is arranged in an electrical line path and subdivides the line path into a pilot portion ending in the pilot contact and an earth portion ending in an earth contact. A frequency filter device is arranged in the pilot portion of the line path.

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 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 method for controlling a multi-phase traction inverter having the following steps is described. It is determined whether the condition that an electrical frequency of the output signal of the traction inverter is below a predefined limit is met. If the condition is met, that phase of the traction inverter which carries the highest current load among all the phases of the traction inverter is ascertained. A duty cycle offset of this phase with respect to a duty cycle of 50% is ascertained. The duty cycle offset of this phase is then changed by changing the duty cycle of this phase by a duty cycle change. Finally, the duty cycles of the other phases of the traction inverter are adapted by also changing their duty cycles by the duty cycle change. Furthermore, a traction inverter having a control unit which implements the method is described.

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 belongs to the technical field of vehicle energy harvesting, and particularly relates to an energy harvesting device with magnetic frequency rising coupled with electrical frequency rising and a vehicle. The magnetic frequency-up-coupled electrical frequency-up energy harvesting device comprises a shell structure which is provided with a rotating cavity; the power generation structure is located in the rotating cavity and comprises a multi-stage magnetic ring and a coil stator, the multi-stage magnetic ring is rotationally arranged, the coil stator is fixedly connected with the inner wall of the rotating cavity and is sleeved with the multi-stage magnetic ring, and the central axis of the multi-stage magnetic ring coincides with the central axis of the coil stator; one end of the conversion driving structure is connected with the vibration source, the other end of the conversion driving structure is in transmission connection with the multi-stage magnetic ring, and the conversion driving structure is used for converting vibration of the vibration source into rotation of the multi-stage magnetic ring relative to the coil stator. Linear vibration is converted into rotary motion of the multi-stage magnetic ring relative to the coil stator through the conversion driving structure, so that electromagnetic induction power generation is realized, and vibration energy of a vehicle is effectively converted into electric energy.

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.

We describe a method and controller for controlling an axial flux machine in which an alternating current supplied to the plurality of coils injects a compensation current to reduce a mechanical resonant component of the rotor. The compensation current is a modulated current component added to at least one of the Quadrature Current (Iq) and Direct Current (Id) components (when the alternating current is represented as a vectored DC component), when the rotor is rotating over one or more ranges of rotational speeds. The modulated current component has an electrical frequency that varies over a range of frequencies between a first frequency and a second frequency depending on the rotational speed of the rotor, the range of frequencies including a frequency that is substantially the same as a fundamental mechanical resonant frequency of the rotor, and having a phase that is out of phase with the fundamental mechanical resonant frequency of the rotor.