110 results about "Velocity modulation" patented technology

The present invention provides a hybrid field excitation flux switching electric motor. On one hand, a stator part adopts a centralized armature winding, an exciting winding, a straight channel rotor, and a permanent magnet arranged in the stator. On the other hand, the rotor part is a salient pole and is not provided with a permanent magnet or a winding. The structure is extraordinary simple and durable. The electromagnetic capability of four centralized armature coils which are designed to form a single-phase armature winding is controlled by the corresponding exciting winding coil through the exciting current. On structure, the advantages of compactness, simpleness, good robustness and suitability for operation with high speed of the permanent magnet flux switching electric motor are kept. The function of hybrid field excitation can be realized without additionally adding the volume of the electric motor. The electric motor is guaranteed to have stronger torque output capability and higher power density. The electric motor is especially suitable for the application occasion with high volume and large output. The functions of large torque in torque-constant area and broad velocity modulation in power-constant area can be realized.

The disclosure describes a system to provide a steady supply of lumber pieces to a board separating device and insure the correct positioning of each lumber piece, at the proper time, thus allowing the separating device to function at a substantially higher rate than hitherto possible with previously known infeeding arrangements.

The invention relates to a light and small type permanent magnetic packaging Ku waveband coaxial transition device. The cathode A of a focusing cathode E is loaded; explosion electronic emission occurs under the condition of externally added high voltage; after electronic beams pass cascading double resonance reflection cavities, initial speed pre-modulation is acquired; speed modulation is completely converted into density modulation; high-frequency electric fields in the cavities are extracted and sufficient interactions occur between the high-frequency electric fields and clustering electronics transmitted therein; generated Ku waveband HPM is externally coupled and output through coaxial output waves; and finally, coaxial grooves in an inner conductor B absorb electronic beams of restenergy. The intensity of the generated electric fields is 0.3T, the weight of the permanent magnet is 63.5kg; and under the guidance magnetic field, effective emission and transmission of the electronic beams are achieved. By introducing the cascading double resonance reflection cavities, coupling of the electromagnetic fields in the modulation cavities to diode regions is reduced, radial fluctuation of the electronic beams is reduced and the required guidance magnetic field is reduced. The working mode of the device is TM02, so the novel device is allowed to have quite high power cavity in the Ku waveband.

The invention relates to a tire-type gantry container crane with power supplied by a speed-control fuel-saving diesel generating set, which is characterized in that the crane comprises an electrical system; a three-phase AC power source generated by the diesel generating set capable of operating at variable speed, together with a speed control device thereof, is converted into a DC power source via a power electronic reversible rectifying device used for controlling the generated electricity quantity of the diesel generating set, and then direct current is directly supplied to frequency converters driving mechanisms to operate; the DC power source is converted into an AC power source with adjustable frequency so as to be used for driving a hoisting mechanism, a cart mechanism and a trolley mechanism; a super capacitor set is connected with a DC side bus in parallel; the total capacitance of the super capacitor set is below 10 farad; and a central control link is formed by an intelligent industrial control system and is used for detecting the current and voltage states on the DC bus so as to calculate the power situation of the DC bus, and then the power situation is used as the speed control basis of the diesel generating set so as to control the rotating speed and torque of a generator. The container crane has the advantages of low cost, energy conservation and environmental protection.

The invention relates to a high-power wide-speed adjustment built-in permanent magnet brush wheel-free motor for an electric automobile, which comprises a shell, and a rotor and a stator arranged in the shell. The rotor comprises a stator core and a stator winding which are fixed on the inner wall of the shell. The stator core comprises a stator yoke, a stator slot and a stator tooth. The rotor comprises a rotating shaft and a rotor core. An inner circle of the rotor core is uniformly embedded with radical magnetizing rectangular magnetic steel strips or cracked radical magnetizing rectangular steel strips along the circumferential direction. The radical magnetizing rectangular magnetic steel strips or the cracked radical magnetizing rectangular steel strips form permanent magnetic poles. An external circle of a pole shoe of a rotor is of a non-concentric arc-shaped curved surface and provided with non-uniformly symmetric radial air gaps. Magnet-shielding magnetic bridges are arranged between the magnetic poles and the high saturation of a magnetic circuit at a cross section of the magnet-shielding magnetic bridges is ensured. The radical insertion depth of the magnetic steel strips in the core, the width of an empty groove of a magnet-embedding steel groove, the angle of the empty groove of the magnet-embedding steel groove, the angle of polar arc and so on are adjusted to realize smooth operation with high efficiency, high power output, wide speed adjustment and quick response.

A hydraulic transmission petroleum mining pumping unit, it compose of foundation, front bracket, rear bracket, up pull-rod and diagonal pull-rod that are connected by hinge, hydraulic transmission assembly is set between front and rear bracket which compose of slide-block type variable and reversing gear hydraulic pump of combinational flat valve, slide-block type plate transmission low-speed torque hydraulic motor, oil-box and accessories group of pipe line, that is the transmission system operates opening pump motor to volume velocity modulation and reversing loop, and combine by hydraulic transmission wheel connecting with transmission pieces of mining pump, control by machined, electric and hydraulic adjustable system to work continuously and reciprocally with the needful stroke and stroke time.

The invention discloses a high-power millimeter-wave and terahertz wave signal frequency multiplier device, which comprises a low-frequency-band slow-wave structure, a high-frequency-band slow-wave structure and a drift tube, wherein the drift tube is connected between the low-frequency-band slow-wave structure and the high-frequency-band slow-wave structure. A low-frequency-band millimeter wave or terahertz wave and an electron beam are interacted in the low-frequency-band slow-wave structure to generate velocity modulation, the electron beam generates electron bunching and density modulation in a drift tube area, and the bunched electron beams carry signals to excite high-frequency electromagnetic waves in the high-frequency-band slow-wave structure and the high-frequency electromagnetic waves are amplified. The device provided by the invention can obtain stable high-frequency-band millimeter wave and high-frequency terahertz wave signals, and simultaneously has the characteristic of low cost.

The invention provides a device for mechanically controlling exposure time, which comprises a disc-like shutter with a fan-shaped hole, a direct current brushless motor for controlling the rotation of the disc-like shutter, and a control circuit for controlling the rotational speed of the direct current brushless motor, wherein the control circuit is used for computing the rotational speed of the direct current brushless motor according to the currently-required exposure time and the current position of the disc-like shutter, and controlling the direct current brushless motor to work at the rotational speed. The invention simultaneously provides a corresponding method for controlling the exposure time. The device and the method utilize a speed modulation and large-hole residing mode to realize the exposure time, and can realize 27 segments of exposure time, wherein the minimum accurate exposure time can reach 2 ms and the maximum accurate exposure time can be infinitely extended upwards, thus the dynamic range is wide; the consistency, the uniformity and the reliability are all good; the accuracy is high; and the device and the method can be applied to aerospace systems and ground systems.

A continuous liquid ejection system includes a liquid chamber in fluidic communication with a nozzle. The liquid chamber contains liquid under pressure sufficient to eject a liquid jet through the nozzle. A drop formation device is associated with the liquid jet and is actuatable to produce a modulation in the liquid jet that cause portions of the liquid jet to break off into a series of drop pairs traveling along a path. Each drop pair is separated in time on average by a drop pair period. Each drop pair includes a first drop and a second drop. A charging device includes a charge electrode associated with the liquid jet and a source of varying electrical potential between the charge electrode and the liquid jet. The source of varying electrical potential provides a waveform that includes a period that is equal to the drop pair period. The waveform also includes a first distinct voltage state and a second distinct voltage state. The charging device is synchronized with the drop formation device to produce a first charge state on the first drop and to produce a second charge state on the second drop. A drop velocity modulation device varies a relative velocity of a first drop and a second drop of a selected drop pair to control whether the first drop and the second drop of the selected drop pair combine with each other to form a combined drop. The combined drop has a third charge state. A deflection device causes the first drop having the first charge state to travel along a first path, causes the second drop having the second charge state to travel along a second path, and causes the combined drop having the third charge state to travel along a third path.

The invention provides a modulated laser range finder and method. The laser range finder including a laser configured to project a laser beam onto a target object thereby causing a target beam to be reflected from the target object, wherein the laser beam has a frequency, and wherein the frequency is modulated at a known rate, a first beam splitter positioned to split a reference beam from the laser beam, a second beam splitter positioned to receive the target beam and the reference beam, wherein the target beam and the reference beam are coherently combined, the coherently combined beams establishing a difference frequency, and a detector configured to measure the difference frequency.

A method of ejecting liquid drops includes providing liquid under pressure sufficient to eject a liquid jet through a nozzle of a liquid chamber. The liquid jet is modulated to cause portions of the liquid jet to break off into a series of drop pairs traveling along a path using a drop formation device. Each drop pair is separated in time on average by the drop pair period. Each drop pair includes a first drop and a second drop. A charging device is provided that includes a charge electrode associated with the liquid jet and a source of varying electrical potential between the charge electrode and the liquid jet. The source of varying electrical potential provides a waveform that includes a period that is equal to the drop pair period. The waveform also includes a first distinct voltage state and a second distinct voltage state. The charging device is synchronized with the drop formation device to produce a first charge state on the first drop and to produce a second charge state on the second drop. A relative velocity of a first drop and a second drop of a selected drop pair is varied using a drop velocity modulation device to control whether the first drop and the second drop of the selected drop pair combine with each other to form a combined drop. The combined drop has a third charge state. A deflection device is used to cause the first drop having the first charge state to travel along a first path, to cause the second drop having the second charge state to travel along a second path, and to cause the combined drop having the third charge state to travel along a third path.

A continuous liquid ejection system includes a liquid chamber in fluidic communication with a nozzle. The liquid chamber contains liquid under pressure sufficient to eject a liquid jet through the nozzle. A drop formation device is associated with the liquid jet and is actuatable to produce a modulation in the liquid jet that cause portions of the liquid jet to break off into a series of drop pairs traveling along a path. Each drop pair is separated in time on average by a drop pair period. Each drop pair includes a first drop and a second drop. A charging device includes a charge electrode associated with the liquid jet and a source of varying electrical potential between the charge electrode and the liquid jet. The source of varying electrical potential provides a waveform that includes a period that is equal to the drop pair period. The waveform also includes a first distinct voltage state and a second distinct voltage state. The charging device is synchronized with the drop formation device to produce a first charge state on the first drop and to produce a second charge state on the second drop. A drop velocity modulation device varies a relative velocity of a first drop and a second drop of a selected drop pair to control whether the first drop and the second drop of the selected drop pair combine with each other to form a combined drop. The combined drop has a third charge state. A deflection device causes the first drop having the first charge state to travel along a first path, causes the second drop having the second charge state to travel along a second path, and causes the combined drop having the third charge state to travel along a third path.

The invention relates to a full-digital control AC-DC speed adjustment and loading system for teaching. The core of the system comprises two parts of a hardware part and a software part. The system is characterized in that the software part is embedded in an operating system of the hardware part; in the hardware part, a movement control card and a data acquisition card of a computer are both connected with a test line, the test line is connected with a voltage signal feedback of rotary speed and current and an AC-DC motor, the AC-DC motor is coaxially connected with a magnetic powder brake, the data acquisition card is connected with the magnetic powder brake by a magnetic powder brake controller, and the remote programmable control loading is completed. The system of the invention has the advantages of digitization, intelligence, networking, simulating and systematization.

A fingerprint authentication system with a slide sensor provides guidance to help the user swipe his or her fingertip across the slide sensor at the ideal speed by modulating a pulse signal according to the swipe speed and converting the modulated pulse signal to an audible tone with a pitch that varies with the swipe speed, or to an equivalent visible display.

The invention provides a three-dimensional high-speed wide view field tomography method and a device thereof. The method comprises the following steps: 1, generating light beams; 2, performing high-speed space-time focusing surface scanning: performing dispersion and parallel collimation on the light beams, applying different phases to the light beams with different wavelengths/frequencies to carry out modulation in order to make the light beams have different time delays, and converging the modulated light beams onto a sample in order to form a focusing surface; 3, performing expanded field depth detection: arranging a high-speed zoom lens on the conjugate plane of the pupil entrance surface of an objective lens for lights formed by exiting the sample to achieve excitation end axial scanning synchronized imaging of object planes with different depths; and 4, simultaneously controlling: simultaneously controlling the light velocity modulation in the high-speed space-time focusing surface scanning step and the high-speed zoom lens in the developed field depth detection step. The method can improve the imaging speed and realize the high-time resolution three-dimensional imaging underthe premise of ensuring the spatial resolution.

The utility model discloses a hydraulic system of a proportional speed-regulating garbage disposal device with a back cavity, which comprises a pushing oil cylinder and an oil tank; a back-cavity proportional speed-regulating circuit is arranged between the back cavity of the pushing oil cylinder and the oil cylinder; the back-cavity proportional speed-regulation circuit comprises a bridge-type return circuit composed of a first one-way valve, a second one-way valve, a third one-way valve and a fourth one-way valve; a proportional speed-regulating valve is arranged between the first one-way valve and the second one-way valve; a reversing valve is arranged between the bridge-type return circuit and the oil tank. The hydraulic system has a reasonable structure and ensures the stable operation of the oil cylinder at the normal crawl speed through a small-flow proportional speed-regulating valve. The return circuit is arranged in the return circuit of the back cavity of an executive oil cylinder and realizes proportional speed regulation through the bridge-type return circuit. The specification of the proportional speed-regulating valve is adopted on the basis of the flow required by the back cavity. The return circuit requirement of a large-flow proportional reversing valve can be satisfied through the small-flow proportional speed-regulating valve.

A CRT apparatus is composed of a CRT, a deflection yoke, a velocity modulation coil, and a magnetic member. The CRT includes a glass bulb made up of a panel and a funnel connected together and an electron gun housed within the glass bulb, and emits an electron beam from the electron gun toward a phosphor screen formed on an inner surface of the panel. The deflection yoke includes a horizontal deflection coil and a vertical deflection coil, and scans the electron beam over the phosphor screen. The velocity modulation coil is arranged outside the CRT, and modulates a velocity at which the electron beam is scanned horizontally. The magnetic member is arranged to surround an outer circumference of the CRT with the velocity modulation coil positioned therebetween, so as to cover a position corresponding to a space between axially aligned electrodes of the electron gun.