2194 results about "Current meter" patented technology

An exemplary apparatus embodiment provides for controlling current supplied to solid state lighting, such as light emitting diodes. An exemplary apparatus comprises a memory adapted to store a plurality of current parameters; and a control circuit adapted to modulate an energizing cycle time period for providing a substantially constant DC average current to the solid state lighting in response to a selected current parameter of the plurality of current parameters. In an exemplary embodiment, the control circuit modulates a current provided to the solid state lighting in response to a predetermined minimum current level (IMIN) parameter and a predetermined peak current level (IP) parameter, such that the DC average current level (IO) is substantially proportional to one-half of a sum of a predetermined peak current level (“IP”) and a predetermined minimum current levelIM(IO∝IP+IMIN2).

A motor control device capable of suitably inhibiting the pulsating torque of an alternating-current motor is provided. The motor control device comprises an axis error inference machine (30) which infers an axis error based on a current value of an inverter, detected by a current sensor (2); a Fourier rectification machine (316a) which extracts an axis error vector from the time-base changes of the axis error; an integral control machine (316b) additionally provided with a circular amplitude limiter, which is used to calculate a correction current vector for offsetting the pulsating torque, wherein a circle with a set amplitude limiting value serving as the radius is used as the base for limiting the movement of the correction current vector, and the integral control machine (316b) additionally provided with the circular amplitude limiter performs the circular amplitude limiting for limiting the movement of the correction current vector so as to enable the deflection angle of the correction current vector to be close to the deflection angle of the axis error vector.

A system for providing an accurate indication of the remaining life of a battery. The system includes a first circuit that provides a control signal. A second circuit employs an internal resistance value of the battery and a battery voltage to provide the indication of remaining battery life in response to the control signal. In a specific embodiment, the second circuit includes a third circuit that measures the internal resistance of the battery in response to the control signal. The third circuit also includes a circuit for measuring an output current and an output voltage of the battery at varying battery loads. The circuit for measuring an output current includes an ammeter and a switching load. In a more specific embodiment, the switching load is implemented as a transmitter that is selectively activated via the control signal. A fourth circuit, included in the second circuit, provides the indication of remaining battery life in response to the internal resistance. The fourth circuit also includes a circuit for selecting a battery discharge curve in accordance with the internal resistance. Software running on the first circuit generates the estimate based on the discharge curve, which is subsequently displayed via a display.

To provide additional charge storage for an electric vehicle, an additional battery (100) is connected in parallel with a regenerative braking direct charged battery (22) through a current limiting circuit (104 or 120). The additional battery (100) is charged by an external charger such as a plug-in charger or a solar panel that supply minimal current to prevent generation of battery heat. Current flows from the additional battery (100) to the regenerative braking charged batteries (22) so that both batteries can be charged. However, when excessive charge is drawn to drive the vehicle electric motor (20), the current limiter circuit (104 or 120) serves to prevent the discharge of additional battery (100) from creating excessive heat in the additional battery (100). Further, when regenerative braking is applied the current limiter circuit (120), or a diode buffer (102) in combination with current limiter (104), serves to prevent charging from creating excessive heat in the additional battery (100) and eliminates the need for a cooling structure in the additional battery (100).

A system and method is provided for automatically reading meters, such as utility meters. A camera unit is attached to or otherwise associated with an existing meter. From time to time, either automatically, or upon wireless command, the camera unit takes an image of the meter's readings, and communicates wirelessly the image or image data, to a local area receiver. The images can be transmitted immediately, or stored for later transmission, depending on the network protocol. The camera unit is battery powered, and operates communication protocols that enable extended operational life. These protocols allow for the camera's radio and processor to be turned on only when necessary, and then for only brief periods of time. At most times, the camera is in a power-conserving sleep mode. Multiple camera units may be arranged to communicate meter image data to the local area receiver, either using asynchronous or synchronous processes. In this way, star, point-to-point, MESH and ring networking topologies are enabled. The meter image data is communicated from the receiver to a central office using a wide area connection, where the image data is used for determining the meter reading. In one example, the image may be included with a utility bill as confirmed evidence of the current meter reading.

Systems and methods for positioning one or more spread elements of a marine seismic spread are described. One system comprises a seismic vessel-mounted acoustic Doppler current meter adapted to ascertain at least the horizontal component of the current velocity vector at a point ahead of the seismic vessel, and one or more controllers adapted to use the ascertained current velocity vector to control position of one or more seismic spread elements. It is emphasized that this abstract is provided to comply with the rules requiring an abstract, which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims. 37 CFR 1.72(b).

Intelligent contrast warmers and methods for operating and using same are described. An intelligent contrast warmer may include elements configured to monitor information associated with the intelligent contrast warmer and contrast media stored in contrast bottles housed within the intelligent contrast warmer, such as contrast warmer temperatures, contrast warmer temperatures outside of specifications, contrast media inventory, expiration dates of contrast media, personnel authorized to access contrast media, and dates and times associated with contrast media added to and removed from the intelligent contrast warmer. A method for monitoring the expiration date of contrast bottles may include labeling the contrast bottles and reading the information from the label into a computing device. The computing device may be configured to monitor the expiration dates and to generate an alarm responsive to a current time being within a threshold duration of the expiration time for a contrast bottle.

A magnetic memory device comprises a magnetic tunnel junction (MTJ) having a ferromagnetic free layer, and exhibits a first, relatively high resistance state, and a second, relatively low resistance state. To write to the magnetic memory device a current IMTJ is driven through the MTJ. For a first duration, the current is equal to a DC threshold current, being the DC current required to switch the multilayer structure between the first state and the second state. This induces a C-like domain structure in the free layer. For a second duration, the current IMTJ is larger than the DC threshold current. This causes the MTJ to switch states. The current requited to cause switching is less than that required using a uniform current pulse.

The invention relates to a map matching method of floating car data. An optimal matching path is guaranteed and an alternative path set of each global positioning system (GPS) point is minimized at the same time by means of multistandard dynamic planning technology, and therefore the matching efficiency is improved. In addition, aiming at the characteristics of map matching, a traditional shortest path analytical method is improved, and the matching speed is further improved by reducing a mark initialization process and a searching method from multiple points to a single point. Compared with other current methods, the map matching method of the floating car data is better in matching accuracy and matching performance, can achieve real-time map matching processing of low sample frequency floating car data in a city traffic network, and has business popularization and application prospects.

When a rectangular wave voltage control mode is selected, a control apparatus estimates the output torque of an alternating-current motor based on the outputs of a current sensor and a rotation angle sensor, and executes torque feedback control by adjusting the phase of rectangular wave voltage based on the difference between the torque estimated value and a torque command value. The control apparatus executes a switching interruption that outputs a control command to a switching element of an inverter every 60 degrees of electrical angle, and executes an angle interruption that samples the phase currents of the alternating-current motor based on the output of the current sensor and converts those phase currents into a d-axis current and a q-axis current every predetermined electrical angle that is set beforehand. The control apparatus for the alternating-current motor then sets the predetermined electrical angle such that the number of angle interruptions between switching interruptions varies according to the rotation speed of the alternating-current motor.

The invention provides an appointed cooking control method of a cooking electrical equipment using a digital menu, which comprises the following steps: step 1: a signal receiving module obtains a user command containing the name information of dishes to be cooked and cooking finish time information and transmits the user command to a central processing module; step 2: the central processing module transfers corresponding digital menu from a storage module according to the name information of dishes to be cooked, obtaining the lasting time standard data in the digital menu and calculating the cooking start time according to the cooking finish time information and the lasting time standard data; and step 3: a heating module is controlled to start the cooking processes of corresponding dishes when the central processing module judges that current time reaches the cooking start time according to timing information of a timing module. With adoption of the control method provided by the invention, the user can directly appoint the cooking finish time without spending energy to calculate time, and the work in memorizing the consuming time of a great number of dish cooking processes by the user is saved.

A calculator is provided to assist a vehicle operator with the task of filling out and maintaining their log books. The calculator includes an input device that may receive a signal in accordance with the setting and release of the parking brake. The input device may also be a physical button pressed by the vehicle operator. A clock may be built into the device to provide current time and date. The input device provides a time stamp that may be altered or varied as directed by the user. A filter may be used to select and remove specific display data, such as an activity with a duration of less than a predetermined time which may be 7.5 minutes. A rounding algorithm may be used to generate rounded times in which the time stamp data may be rounded to the closest fifteen minute increment. These rounded times may be stored in a register to be recalled and arithmetically analyzed to assist the user in filling out and keeping the log books up to date.

A system and method including a simulator operating in conjunction with a search-engine, for improving document and site findability. Users input their content (pages or sites) and the simulator will analyze the site in terms of structure and content. It will then give the user a ranked list of suggestions about how the user might improve his / her site's findability. The user will then be able to apply some or all of these suggestions, or any other changes, by virtually modifying the site, and then immediately receive feedback both on how the pages look and a sense of the degree of findability improvement. The interactive process allows users to simulate modifications in their site structure and content in order to improve its findability. When the user completes the modifications and is satisfied with the new findability of his site, the user will be able then to replace his / her current site in the repository with the modified one.

A motor is provided that includes magnetic poles, an armature core, armature coils, a commutator, and power supply brushes. The armature core includes teeth arranged in the circumferential direction to extend in a radial pattern. The armature coils include inner layer coils and outer layer coils. Each of the inner layer coils is wound around radially proximal end portions of two circumferentially adjacent teeth or a radially proximal end portion of one of the teeth. The inner layer coils are arranged in the circumferential direction without overlapping each other in the radial direction. Each of the outer layer coils is wound around radially distal end portions of two circumferentially adjacent teeth by distributed winding. The outer layer coils are arranged radially outward of the inner layer coils and are arranged in the circumferential direction without overlapping each other in the radial direction. The circumferential center of the inner layer coils and the circumferential center of the outer layer coils are displaced in the circumferential direction.

The invention discloses a positioning method, and a device. The positioning method is used for vehicle indoor positioning, and comprises following steps: the geographic position, the driving speed, and the angular velocity of vehicles at time T are acquired; position reckoning is carried out based on the geographic position, the driving speed, and the angular velocity of vehicles at time T so as to obtain the reckoned geographic position of the vehicles at current time T; driving track characteristics of the vehicles are acquired based on the driving speed and the angular velocity from time T to time T; route characteristics and a map driving route matching the driving track characteristics are acquired in a preset electronic map of the current driving geographic area; the map geographic position of the reckoned geographic position on the map driving route is acquired; fusion of the map geographic position and the reckoned geographic position is carried out so as to obtain the geographic position of the vehicles at current time T. The positioning method is capable of solving a technical problem that positioning results at parking lots are not accurate, and positioning with high applicability and high positioning result accurate is realized.

Determination of an estimated initial angular position of the rotor of an AC motor includes application of voltages corresponding to a high frequency reference signal vector to the stator windings of the motor and production of an estimated initial angular position of the rotor as a function of the resulting q-axis stator current component iq_HF, adjustment of transformation of signal vectors from stationary to rotating coordinates and vice versa using the estimated angular position, and production of an adjusted estimated angular position of the rotor as a function of the q-axis stator current component as adjusted. Determination of an initial estimated angular position of the rotor and production of an adjusted initial estimated angular position of the rotor is performed with the rotor at standstill and before initially applying voltage corresponding to the drive signal vector to the stator windings, and production of an initial value of a drive signal vector command in stationary coordinates uses the adjusted estimated angular position. Determination of an estimated angular position of the rotor after application of stator current may use a different method, such as a physical relative position sensor.

The invention discloses a submersible buoy for ocean observation, which comprises a cable arranged vertically, and a first temperature-salt chain, a second temperature-salt chain, a first microscale fixed-point turbulence meter, a second microscale Scale fixed-point turbulence meter, main floating body and seat body; the seat body is arranged on the top of the cable, and the seat body is equipped with a plurality of solar cells as power supply; the first temperature-salt chain and the second temperature-salt chain are both Including temperature instrument, temperature and depth instrument and temperature and salt depth instrument, Doppler flow velocity profiler is installed on the main floating body, reciprocating micro-scale turbulence profiler is installed in the middle of the cable, and high-precision temperature and salt depth instrument and single-point type are installed in the lower part. Current meter; the side wall of the main buoy is provided with a plurality of satellite communication buoys for transferring observation data, and the satellite communication buoys are connected to the main buoy through a timing release device; the submersible buoy for ocean observation can realize the Observation data can be obtained regularly before recovery, which is very practical.

The invention relates to dynamic loading methods based on a servo motor, belonging to the field of motors and solving the problem that the properties of a direct-current motor can not satisfy the requirements of an electric loading system. The first method comprises the following steps of: transmitting a driving torque instruction value and an initial braking torque instruction value by utilizing a system controller according to the given loading spectrum to drive a measured motor to rotate; meanwhile, driving a loading motor to generate a braking torque for loading the measured motor; and then, feeding back the actual output torque value applied to the measured motor by the loading motor through adopting a torque / rotary speed sensor, and regulating the braking torque instruction value by utilizing the system controller according to a deviation so that the actual output torque value applied to the measured motor by the loading motor rapidly tracks the initial braking torque instruction value. The second method of the invention comprises the following steps of: calibrating the input and output torque relation curve of the loading motor by using the torque / rotary speed sensor, and then transmitting the driving torque instruction value and the braking torque instruction by using the system controller according to the given loading spectrum and the relation curve to load the measured motor.

This invention is designed to enhance the existing hazard signal, turn signal and brake signals of vehicles by placing mini spot lamps on four corners and or to the rear of vehicle, near or at existing signal lamp locations or on sides of vehicle, directing their light beams on a side angle towards the ground away from the vehicle, thus illuminating the indicated signal on the ground for other drivers to see the vehicles intentions. Important information from signal illumination on the ground is transmitted to a following driver several vehicles back, to either side or from an opposing direction of indicating vehicle, who's view may be blocked by interspersed vehicles between the indicating vehicle and the following or on coming driver. Many cases of rear end collisions and accidents are caused from following to close to the vehicle in front and not allowing the proper time to react to other vehicles braking or turning.

A movement assistance device includes a provided information acquirer that acquires, traffic signal cycle data in which traffic signal data comprised of identification information of a traffic light, which is stored in an SNS server, and an image capture date and time and a lighting duration time of the traffic light is organized for each light color pattern of the traffic light, and that specifies, from the identification information of the traffic light of the traffic signal cycle data, a traffic light which a moving object will pass, and calculates a remaining lighting time which will elapse until the lighting of each light color of the specified traffic light is ended from both the time difference between the image capture date and time of each light color of the traffic signal cycle data and the current time, and the lighting duration time of the traffic signal cycle data.

The accuracy and flexibility of a branch circuit monitor is improved by storing specifications, including error correction factors, for a plurality of current transformers in the monitor's memory and enabling current transformers with stored specifications to be selected for use with the monitor.

The invention discloses a Hall phase sequence detecting method of a brushless direct-current motor, relating to the technical field of the brushless direct-current motor. Based on the operating principle of the brushless direct-current motor and the magnetic potential synthesis principle, the method adopts the magnetic potential of a fixed stator to position a rotor, and obtains the position of the rotor by reading a signal of a Hall position sensor, thus determining the relation of the magnetic potential of a stator and the position of the rotor. The invention also discloses a phase sequence detecting device of the brushless direct-current motor, comprising a computational processing module, a motor-driven module and a man-machine interface module, wherein the man-machine interface module comprises an input unit and an output display unit; a motor-driven unit is in a three-phase inverse bridge-type structure; and the calculated processing module is respectively connected with the motor-driven module, the input unit and the output display unit by signals. Compared with the prior art, the detecting device has the advantages that the structure is simple, the use is convenient, the cost is low and the like.

The invention provides a fish swimming capability measuring method and a submerged open-type measuring device. The method includes 1, making preparation before experiments; 2, testing and correcting systems; 3, testing swimming capabilities of fishes; 4, collecting experiment data; and 5, maintaining and cleaning the systems. A water outlet tube with a water level adjusting device is mounted at the bottom of a water tank of the submerged open-type testing device. A support, an experiment table base, a stabilizing cove and a testing tube are mounted in the water tank. A water current creating system formed by a motor, a water inlet hole and a vane wheel is arranged at one end of the testing tube. The water current creating system and a test area with an inspection window are respectively connected with two ends of a rectifying device. The test area with the inspection window is connected with a flow rate test area. A current meter is mounted in the flow rate test area connected with a water level control area. A water current flow rate monitor, a frequency conversion controller and a water quality monitor are mounted on a control panel. A water inlet tube is mounted at one end of the upper portion of the water tank.

The testing device is in use for measuring photoelectric properties of photovoltaic conversion materials and parts. In the device, xenon lamp simulates sunlight source. Optical fiber (21) of guiding light beam connects grating monochromator with xenon lamp, and optical fiber (22) of guiding light beam connects grating monochromator with testing dark box, where there are photocell and sensor of photometer inside. Output end of photocell is connected to voltage / current meter. Output end of sensor of photometer is connected to photometer. Output ends of photometer and voltage / current meter through data acquisition interface is connected to computer for in site measuring luminous intensity irradiated on photocell. Sensor of photometer is placed on the position the photocell located.

The invention provides a weak magnetic speed regulating method for an induction motor, and belongs to the technical field of alternating current motors and control thereof. The method comprises the following steps of: determining actual given values of exciting current and torque current by using a current control algorithm based on current optimal working trajectory; acquiring space vector pulse width modulation (SVPWM) through a current loop, and obtaining calculation action time of two adjacent non-zero voltage vectors; determining actual action time of the two non-zero voltage vectors through a modulation algorithm so as to acquire a running voltage of the motor; and at the same time, determining a field current calculation given value of the next time through the calculation action time of the two adjacent non-zero voltage vectors. By the method, an operating range of speed constant power of the induction motor is enlarged, a utilization ratio of the voltage and the current of an inverter is increased, and the maximum output torque of the induction motor is improved.

The present invention enables modulated wave signals having extremely small waveform distortion to be generated using a relatively simple circuit, and thereby it is possible to hold down vibrations and noise of a motor, which are attributable to torque ripples. In order to remove defects of the conventional techniques, the circuit generates a plurality of trapezoidal wave signals having at least two constant levels based on position sensing signals of magnetic pole of a motor, generates quasi-sinusoidal wave signals at a quasi-sinusoidal wave modulator based on the plurality of trapezoidal wave signals, and compares the quasi-sinusoidal wave signals with a carrier wave so as to perform PWM control of an inverter.

The invention discloses a method for estimating angular acceleration of a permanent magnet brushless direct-current motor, which includes establishing a sliding mode observer and observing components of counter potential of the brushless direct current motor to obtain a counter potential observed value; performing filtration through a band-pass filter and filtering direct current offset and high-frequency components of the counter potential observed value to obtain a filtered value of the counter potential observed value; normalizing the filtered counter potential observed value; and establishing an extended Kalman filter according to a kinematical equation of the brushless direct current motor, extracting location information from a normalized value of the counter potential and then estimating to obtain an angular acceleration value. The method uses the location information included in the counter potential to estimate the angular acceleration of the permanent magnet brushless direct-current motor, so that the problems of long delay and poor precision in computed results caused by the fact that the angular acceleration computation of the permanent magnet brushless direct current motor in prior art is influenced by processing precision of Hoer position sensors and is restricted by resolution ratios are solved.