447results about How to "Suppress resonance" patented technology

In a molded motor having a motor frame molded by covering a stator composed by a straight core with a molding resin, the straight core has a stack of laminas each having a plurality of tees projecting from one long side of a belt-shaped back yoke and a V-shaped cut formed between every two adjoining tees along the back yoke and on its side from which the tees project. The straight core has an insulating layer formed by pre-molding from an insulating resin on its portions excluding at least the inner periphery of each tee. The straight core also has a winding formed about each tee having the insulating layer formed thereon. The stator is formed by bending the straight core at the cuts into an arcuate or annular shape, and joining the opposite ends of the back yokes to each other by welding or adhesion.

The invented optical-fibre grating vibration sensor is characterized by that it utilizes a demodutation grating and a sensing grating and makes them be series-connected together, and respectively makes them be stuck on a main beam and an auxiliary beam, two beams are made of identical material and have identical heat expansion coefficient, so that their central wavelengths can be synchronously shifted with temperature, therefore they have automatic temperature compensation function so as to implement matching filter demodutation. Said invention utilizes the detection of light intensity change of sensing grating reflecting light to monitor the parameters of vibration frequency and vibration amplitude of monitored body, finally utilizes computer or single-chip computer to make analysis and processing of body vibration frequency spectrum.

The invention discloses a multi-converter parallel circulating current restraining method with quick and reactive support. For a single converter, drop control calculation is adopted, and an output reference voltage of the converter is synthesized; resistance-capacitance virtual complex impedance is guided in the output current feedback of the inverter, so that the equivalent output impedance of the converter is of resistance-capacitance performance, wherein capacity component realizes quick and reactive support of the inverter, the resonant vibration between the output impedance of the inverter and the impedance of an electrified wire fence is restricted through resistance component, and fundamental wave circulating currents and harmonic circulating currents are reduced; and through a voltage current control loop, the stability and control precision of a system are further strengthened, and accurate distribution of power is realized. According to the method, the problem that the existing method is not high in power equipartition precision, relatively large in circulating current and relatively large in voltage fluctuation, and the method can be applied to power generation parallel control systems of industrial special power supply and new power supply.

A double-wall structure (1), comprising plate-like bodies (2) and (3) disposed oppositely to each other to form an inner room (4) therebetween, peripheral members (5) disposed so that the inner room (4) can be completely or approximately closed, and perforated plates (13) with a large number of holes (8) disposed between the plate-like bodies facing each other. The double-wall structure is characterized in that an air layer (A) is interposed between the perforated plates and the peripheral members. Thus, since the double-wall structure can suppress the deterioration of a sound reduction index for sound with specific frequencies, it can stably develop sound insulation performance for sound with the various frequencies.

To provide a tread pattern of a pneumatic tire for heavy load enhancing both low noise performance and on-snow performance. Longitudinal length L4C of a central block, longitudinal length L4M of an intermediate block and longitudinal length L4S of an outer block, i.e., circumferential distances of respective tires between the most projecting end points on both sides of a tire circumferential direction of the central, intermediate and outer blocks (4) are defined; and lateral length W4C of the central block, lateral length W4M of the intermediate block and lateral length W4S of the outer block, i.e., tire axial distances between the most projective terminals at both sides in a tire axial direction of the respective central, intermediate and outer blocks (4) are defined. A longitudinal length ratio of the respective blocks is made to (L4S/W4S)<(L4M/W4M)<(L4c/W4C), 1.50 B60C 11/117 4 15 2 2006/7/31 1907738 2007/2/7 100473547 2009/4/1 2009/4/1 2009/4/1 Sumitomo Rubber Industries, Ltd. Japan Takahashi Nobugo xu qian luo yunpo 11227 Japan 2005/8/4 2005-226922

An electric power steering system for a vehicle works to determine an assist command based on steering torque to produce assist torque through an electric motor for assisting in turning a steering wheel of the vehicle, also determines a tracking command for producing automatic steering torque which brings a value of a given physical quantity associated with steering of the vehicle into agreement a target value, and calculates a vibration correction command for use in producing vibration correction torque which suppresses vibration of the steering torque which arises from output of the torque from the electric motor based on a transfer characteristic of transmission of the output of torque from the electric motor as a part of the steering torque through the steering mechanism. A motor driver works to actuate the electric motor based on the sum of the assist command, the tracking command, and the vibration correction command.

Pressure detecting apparatus includes: a housing; a pipe extending from one end of the housing and having an elongated shape; and a pressure sensitive element for detecting pressure and outputting a signal corresponding to the pressure. The pipe includes a top end capable of receiving the pressure. The pressure sensitive element is disposed on the top end of the pipe. The housing includes a connector for retrieving the signal from the pressure sensitive element. The pipe further includes a wiring member disposed inside the pipe so that the wiring member connects between the pressure sensitive element and connector electrically.

The invention discloses a method for restraining a voltage background harmonic wave of a grid-connected inverter. The method adopts a direct-current source, an IGBT (Insulated Gate Bipolar Transistor) intelligent power module and an LCL (Lower Control Limit) type filter, wherein the direct-current source is subjected to a single-phase inversion output through the IGBT intelligent power module; and the single-phase inversion output is accessed to a power grid after being accessed with the LCL type filter. The method disclosed by the invention is characterized by comprising the following steps of: multiplying a sampling voltage signal of the power grid with a reference current amplitude I* after carrying out PLL (Phase Locking Loop) phase locking, so as to obtain a reference current signal; carrying out closed-loop adjustment on the reference current signal and a feedback current iL2 so as to obtain a first path of signals; multiplying the sampling voltage signal of the power grid with a feed-forward function so as to obtain a second path of signals; multiplying a capacitive current signal led by a capacitive branch of the LCL type filter with a virtual resistance function so as to obtain a third path of signals; and combining the first path of the signals, the second path of the signals and the third paths of the signals and then sending the combined signals to Ginv(s) for modulation so as to generate a PWM (Pulse Width Modulation) gate pole drive signal; and triggering a switching tube of the IGBT intelligent power module to be switched on or off by the PWM gate pole drive signal. With the adoption of the method disclosed by the invention, the influence of the background harmonic wave of the power grid can be effectively removed.

The invention relates to a redundant drive five degrees of freedom parallel machine tool with a large rotation angle. The redundant drive five degrees of freedom parallel machine tool with the large rotation angle includes a fixed platform, a movable platform for installing a main shaft head and a first driving branch, a second driving branch, a third driving branch and a fourth driving branch forconnecting the fixed platform and the movable platform, the structures of the first driving branch and the second driving branch are similar, and the first driving branch includes a hooke hinge, a servo driving unit, a revolute pair and a compound sphere hinge; the third driving branch includes a hooke hinge, a servo driving unit and a compound sphere hinge, the fourth driving branch includes a revolute pair, a servo driving unit, a hooke hinge and a revolute pair, and the movable platform of a machine tool and the four driving branches are hinged to form a space closed-cycle parallel mechanism; and the three-dimensional translation and the two-dimensional rotation of the space can be achieved by controlling six servo motors to drive the four branches. The redundant drive five degrees offreedom parallel machine tool with the large rotation angle has the advantages that the branch structures are simple and compact, the orientation workspace is large, the flexibility is high, the rigidity is large, and the singular configuration can be prevented, and can be used for high-speed, high-precision and efficiency machining for free-form surface in complex space.

In an ion trap mass spectrometer including an ion trap space surrounded by a ring electrode and two end cap electrodes placed opposite each other with the ring electrode between them, a method of trapping object ions of a predetermined mass-to-charge ratio in the ion trap space more assuredly and effectively. The method includes the steps of: applying an RF voltage to the ring electrode to trap the object ions; and applying an auxiliary AC voltage to the end cap electrodes, where the auxiliary voltage has a frequency spectrum with a first notch at the basic frequency of the object ions and a second notch at a a beat frequency. Then the second stage is performed where another auxiliary AC voltage of the beat frequency is applied to the end cap electrodes to expel non-object ions still remaining in the ion trap space.

The present invention relates to the lens driving device comprising the spring 90. The spring 90 comprises the holder installation parts 93a to 93d installed to the lens holder 40, the flame installation parts 94a to 94d installed to the flame 60, and the wire installation parts 92a to 92d installed to the suspension wire 16. The space 63 is formed between a first step plane 64a of the flame 60, and a part of the spring 90 positioned between the flame installation part 94a and the wire installation parts 92a to 92d; and the vibration absorbing member 70c is placed at the space 63. At the damper space between the damper table 24 and the rear plane of the flame 60, the vibration absorbing member 70a is filled. At the inner circumference plane of the flame 60, the depression part 74 is formed which is opened towards the space, and the vibration absorbing member 70b which is filled in the space is also continuously filled to the depression part 74.

The invention relates to a traction power supply network tail end voltage boosting device with a power fusing function and a method of the device. The device includes a multiple voltage reduction module and a power-fusing current-converting module; the multiple voltage reduction module is connected into two power supply arm power sources of the tail end of a traction power supply network and includes two single-phase multi-winding transformers of the same structure which are correspondingly connected into the two power supply arm power sources respectively through connection switches; the power-fusing current-converting module is used for performing energy conversion on the two power supply arm power sources and includes a plurality of current conversion sub modules; one set of voltage is connected into two input sides of each current conversion sub module through corresponding secondary windings of the two single-phase multi-winding transformers, so that energy conversion can be performed; and through controlling the switch-on of the current conversion sub modules, output voltage can be boosted, and power fusion of the two power supply arms can be performed. According to the method of the invention, the voltage of the tail end of the traction power supply network can be stabilized and boosted through controlling the power-fusing current-converting module. The device and the method of the invention have the advantages of simple structure, low cost, power fusion and train power network resonance suppression, and can boost the voltage of the tail end of the traction power supply network.

The present application provides a linear actuator which uses a magnetic drive mechanism to drive a movable element and which can effectively suppress resonance of the movable element even when a spring member is connected thereto. Specifically, this linear actuator (1) is provided with: a stator (2), a movable element (6), a spring member (8) connected to the movable element (6) and the stator (2), and a magnetic drive mechanism (5) which drives the movable element (6) along an axis (L). Further, between the stator (2) and the movable element (6), gel-like damper members (9) that comprise silicone gel, etc., are arranged in positions on the axis (L) and/or positions surrounding the axis (L). For example, in the stator (2), the gel-like damper members (9) may be arranged in positions along the axis (L) between the movable element (6) and a base (4) opposite the movable element (6). The gel-like damper members (9) include a first gel-like damper member (91) positioned on the axis (L), and second gel-like damper members (92) positioned so as to surround the axis (L).

In a clutch device 1, a second flywheel assembly 5 is axially movable within a predetermined range relative to a crankshaft 2, and a flywheel 21 has a friction surface 21a on a side remote from an engine. The damper mechanism 6 elastically couples the flywheel 21 to the crankshaft 2. The clutch disk assembly 9 has a friction facing 54 neighboring the first friction surface 21a. The clutch cover assembly 8 is attached to the flywheel 21, and biases the friction facing 54 toward the first friction surface 21a. The release device 10 applies an axial load directed toward the engine to the clutch cover assembly 8, and thereby releases the load toward the friction facing 54. The relative rotation suppressing mechanism 24 couples the second flywheel assembly 5 to the disk-like member 13 when the clutch cover assembly 8 receives the axial load directed toward the engine.