35results about How to "High electromechanical energy conversion efficiency" patented technology

A hybrid piezoelectric energy harvesting transducer system includes: (a) first and second symmetric, pre-curved piezoelectric elements mounted separately on a frame so that their concave major surfaces are positioned opposite to each other; and (b) a linear piezoelectric element mounted separately on the frame and positioned between the pre-curved piezoelectric elements. The pre-curved piezoelectric elements and the linear piezoelectric element are spaced from one another and communicate with energy harvesting circuitry having contact points on the frame. The hybrid piezoelectric energy harvesting transducer system has a higher electromechanical energy conversion efficiency than any known piezoelectric transducer.

The invention relates to a piezoelectric vibrator bilateral fluid driven series connection pump and belongs to the fields of fluid transmission and control. An upper pump body and a lower pump body are connected through a screw, 2-20 piezoelectric vibrators are connected between pump cavities of the two pump bodies in a pressed mode, and valve blocks are pasted at the position of inlets of the pump cavities and an inlet of a valve cavity of the lower pump body. An external inlet of the upper pump body is communicated with adjacent pump cavities, two adjacent pump cavities are communicated through an inter-cavity runner to be connected with the are communicated through an inter-cavity runner to be connected with the piezoelectric vibrators to form a series connection pump I, and an internal outlet and the adjacent pump cavities are communicated through an inter-cavity runner to be connected with the piezoelectric vibrators to form the series connection pump I. an internal inlet of the lower pump body and the adjacent pump cavities are communicated through an inter-cavity runner to be connected with the piezoelectric vibrators to form a series connection pump II, the two the adjacent pump cavities are communicated through an inter-cavity runner to be connected with the piezoelectric vibrators to form the series connection pump II, and a valve cavity and the adjacent pump cavities are communicated through an inter-cavity runner to be connected with the piezoelectric vibrators to form the series connection pump II. An internal outlet of the series connection pump I and the internal inlet of the series connection pump II are communicated, the valve cavity of the series connection pump II is communicated with the external outlet on the upper pump body. The piezoelectric vibrator bilateral fluid driven series connection pump has the advantages that the plurality of the piezoelectric vibrators with two sides driving the fluid simultaneously form series connection piezoelectric pumps, flow quantity is big, pressure and energy efficiency are high, and the piezoelectric vibrator bilateral fluid driven series connection pump is applicable to construction of piezoelectric hydraulic driving with high system backpressure.

The invention relates to a stator self-excitation synchronous motor with double cage barrier rotors and a control method thereof. The stator self-excitation synchronous motor is characterized in that an inner rotor and an outer rotor are positioned on inner and outer sides of a stator respectively; three-phase symmetry power windings and three-phase symmetry control windings are arranged in grooves on inner and outer surfaces of a stator; the rotors are spliced on the side which is close to the stator along the peripheral direction by using the same cage barrier rotor modules to form a rotor with a salient pole; each cage barrier rotor module is connected with a sleeve by positioning grooves and is provided with a plurality of trapezoid grooves; short-circuit cage bars are put into the trapezoid grooves; a stepped breach is formed in the joint of the adjacent cage barrier rotor modules; and after the adjacent modules are spliced, a public trapezoid groove is formed in the joint of the adjacent modules, the depth of a gap at the bottom of the groove reaches the surface of the sleeve, and public cage bars are put into the grooves. The invention aims to provide the stator self-excitation synchronous motor which is convenient to manufacture, can realize the brushless self-excitation of the stator, is high in power density and steady and dynamic properties and is provided with the double cage barrier rotors.

The invention relates to a synchronous motor, which is characterized in that a set of 2p electrode three-phase armature winding and a set of 2q electrode single-phase excitation winding are placed on a stator, the stator self excitation is realized on the power supply of the excitation winding, a rotor is split into the rotor with the convex electrode form by cage barrier modules in the circumferential direction, each cage barrier rotor module is connected with a sleeve made of non-magnetic conducting materials through a positioning groove, the cage barrier rotor modules are provided with a plurality of radial trapezoidal grooves, each trapezoidal groove is provided with a plurality of different step groove widths in the radial direction, short circuit cage strips are placed into the trapezoidal grooves, the edges of the adjacent cage barrier rotor modules are step-shaped notches, public trapezoidal grooves are formed after the split joint, the gap depth at the bottoms of the grooves reaches the outer surface of the sleeve, and public cage strips are placed into the grooves. The invention aims at providing the novel modularized cage barrier rotor and stator self excitation synchronous motor structure with the advantages that the processing and the manufacture are convenient, and the coupling capability on the two sets of windings of the stator realizes the maximization, so high power density and good steady and dynaic performance are realized.

The invention discloses a five degrees-of-freedom conical magnetic levitation switch reluctance motor and a control method. The motor consists of a three-phase 12/8-pole switch reluctance motor and two conical magnetic bearings; the bias winding of one conical magnetic bearing and two windings in the A phase horizontal direction of the switch reluctance motor are connected in series while the biaswinding of the other conical magnetic bearing and the two windings in the A phase vertical direction are connected in series to form two channel A phase composite windings; a constant switch-on strategy is adopted to generate bias magnetic flux of the two magnetic bearings and to generate torque in the reluctance motor; the B and C phase winding structures in the switch reluctance motor in the motor are the same as that of the conventional switch reluctance motor, so that alternate excitation switch-on is performed to generate torque to realize rotary operation; by only controlling the current of the A phase two sets of windings and the current of four radial levitation windings, five suspension force can be controlled to realize the five degrees-of-freedom levitation; and the motor is high in system integration degree, high in magnetic utilization rate, simple in control and convenient to implement.

The invention relates to a stator double-winding alternating-current motor with double cage barrier rotors. The stator double-winding alternating-current motor is characterized in that an inner rotor and an outer rotor of the motor are positioned on inner and outer sides of a stator respectively; three-phase symmetry power windings and three-phase symmetry control windings are arranged on the inner and outer sides of the stator; the inner rotor and the outer rotor are spliced along the peripheral direction by using the same cage barrier rotor modules to form a rotor with a salient pole; each cage barrier rotor module is connected with a sleeve by positioning grooves and is provided with a plurality of radial trapezoid grooves; short-circuit cage bars are put into the grooves; a stepped breach is formed in the joint of the adjacent cage barrier rotor modules; and after the adjacent modules are spliced, a public trapezoid groove is formed in the joint of the adjacent modules, a gap at the bottom of the groove reaches the surface of the sleeve, and public cage bars are put into the grooves. The invention aims to provide the stator double-winding alternating-current motor which is convenient to manufacture, can maximize the coupling capacity of the power windings and the control windings on two sides of the stator, is high in power density and dynamic property and is provided with the double cage barrier rotors.

The invention discloses a free piston type internal combustion linear electricity generation and energy storage system. The free piston type internal combustion linear electricity generation and energy storage system comprises an internal combustion linear electricity generator device in which an internal combustion engine piston connecting rod directly drives a linear motor rotor to generate electricity and an energy storage device used for storing electric energy output by the internal combustion linear electricity generator device. The internal combustion linear electricity generator deviceis connected with a control and driving device for electricity generation driving and electric energy output management. The free piston type internal combustion linear electricity generation and energy storage system has the advantages of high efficiency, high power density, low emission, flexible adaptability to various clean fuels and integration of electric driving and electricity generation.The free piston type internal combustion linear electricity generation and energy storage system serves as a range extender of a hybrid electric vehicle, not only can inherit all advantages of a traditional hybrid electric vehicle, but also has leapfrog and revolutionary development in performance, and has important significance in further improvement on combustion efficiency and fuel oil utilization efficiency, and technical improvement on the clean energy hybrid electric vehicle.

The invention discloses a brushless double-fed motor super-synchronization speed control system and a motor field orientation vector control method and motor direct torque control method for the brushless double-fed motor super-synchronization speed control system. The speed control system comprises a power supply source, a motor stator, a motor rotor, a transformer, a rectifier, a converter, a starting resistor, a drive unit, a controller, a switch K1 and a switch K2, wherein a primary winding and a secondary winding are arranged in the stator; the primary winding is connected with the power supply source; the secondary winding is connected with the power supply source through the switch K2, the converter, the rectifier and the transformer; in the motor starting process, the switch K1 is closed, the secondary winding is connected to the starting resistor in series, the switch K2 is opened and connection of the converter and the secondary winding is cut off; when the rotating speed of the motor is close to a synchronous rotating speed, the switch K1 is opened, the switch 2 is closed and the secondary wining cuts off the starting resistor and communicates with the converter. The brushless double-fed motor super-synchronization speed control system carries out super-synchronization one-way speed control above the synchronous rotating speed by adopting the motor field orientation vector control method and the direct torque control method, and the cost of the required converter is relatively low.

The invention discloses a two-phase multipolar switch reluctance motor which comprises a shell, a left end cap, a right end cap, a stator, a rotor, rotor spoke iron, a rotary shaft, a motor controller, two position sensors and two oscillators. Stator magnetic poles and rotor magnetic poles are in a double convex pole structure identical in number of poles, magnet exciting coils of two adjacent magnetic poles are sequentially connected in a one-positive one-negative manner, two adjacent stator magnetic poles form equant double magnet dividing loops, the stator electric poles and the rotor electric poles are distributed into two sections along the direction of the rotary shaft at same intervals, magnet exciting coils of two sections of the stator magnetic poles are connected into two phases respectively, two sections of the rotor magnetic poles are mutually staggered with one magnetic pole angle, and the two position sensors are connected with the motor controller which is connected with the two oscillators through an electronic switch. The two-phase multipolar switch reluctance motor has the advantages of self-starting capability, narrow dead torque area, namely, zero torque area, lowered vacancy rate of a control circuit and a motor body structure, improved performance, simple structure and good cooling performance of a self-ventilation and cooling system.

The invention belongs to the field of articles for daily use, and in particular relates to a self-powered intelligent walking stick. A walking stick main body consists of two outer shells; an energy storage cavity, a working cavity and a sliding groove are formed in the walking stick main body; external screw threads are formed at the lower end of the walking stick main body; the lower ends of the outer shells are connected with a supporting leg through screw threads; an anti-slip block is mounted at the lower end of the supporting leg; one to five energy transducers are arranged in the energy storage cavity; a sliding block is bonded to a conductive rubber pressing block; the conductive rubber pressing block is bonded to piezoelectric vibrators in the energy transducers; the sliding block is mounted in the sliding groove; the sliding block is connected with a short connecting rod through screw threads; the upper end of the short connecting rod is hinged to a long connecting rod; the long connecting rod is fixed to the interior of the working cavity through a rotating shaft; a limiting sliding groove is formed in the long connecting rod; an energy storage button is connected onto the limiting sliding groove; the right end of the long connecting rod is connected with the inner wall of the working cavity through a reset spring; an energy storage circuit board is fixed to the interior of a groove in the left side of the working cavity, and is connected with a positioning transmitting device.

The invention relates to a cage barrier spliced outer rotor stator double-winding alternating current motor. The motor is characterized in that an outer rotor is arranged outside a stator, a three-phase symmetry power winding and a control winding are arranged in slots on the surface of the outer side of the stator, and the same cage outer rotor modules are connected with a sleeve through outside positioning slots and spliced in a circumferential direction to form the outer rotor with salient pole types; the inner surface of each cage barrier outer rotor module is provided with radial trapezoid-shaped slots which have multiple different step slot widths, and short circuit cage bars are arranged in the slots; after the adjacent rotor modules are spliced, common trapezoid-shaped slots are formed on connection parts and have multiple different step slot widths along a radial direction, gaps of the bottoms of the slots reach the inner surface of the sleeve, and common cage bars are arranged in the slots; and the invention aims to provide the novel cage barrier combined outer rotor stator double-feed alternating current motor which is convenient to process and manufacture, ensures that the coupling capacity of two windings of the stator is optimized, and has the high power density and the excellent steady state and dynamic performance.

The invention discloses a cage-shaped brushless double-fed alternating-current motor with a heterogeneous rotor structure. The cage-shaped brushless double-fed alternating-current motor is characterized in that a rotor comprises heterogeneous end covers, a rotor iron core and a rotary shaft, wherein all punching pieces of the rotor iron core are provided with a plurality of groove holes, and copper strips are embedded into the groove holes in an insulated manner. In the same quadrant, from the symmetrical axis to the outer edge, the groove holes are distributed in a mode of in-sequence and symmetric increase of the diameter. The heterogeneous end covers are formed by embedding of conductive parts and insulating parts, the positions and the shapes of the two end parts of the conductive parts correspond to the groove holes, and the end parts with the equal diameter in the same quadrant are connected in sequence by a two-two manner. The cage-shaped brushless double-fed alternating-current motor disclosed by the invention has the beneficial effects that the form of combining the heterogeneous end covers and the copper strips of the rotor is adopted, the structure is compact, the connecting strength is enhanced, the problem of looseness and throwing out of connecting guide lines at the end parts of the short-circuit cage-shaped rotor when in high-speed rotation is solved, so that the reliability of the motor is improved; and since the embedded copper strips with different sectional surfaces are adopted, the basic equalization of the currents among different short-circuit windings is ensured, so that the electromagnetic torque provided by all guiding strips is more uniform, and the electromechanical energy conversion efficiency is higher.

The invention provides an end-fixed cross beam type traveling wave linear ultrasonic motor, which comprises a stator and a rotor, and is characterized in that the stator comprises a metal elastomer, a piezoelectric ceramic group and a plurality of driving teeth, and the piezoelectric ceramic group comprises excitation piezoelectric ceramics and energy-absorbing piezoelectric ceramics; the two ends of the metal elastomer are connected with the end of the excitation piezoelectric ceramic and the end of the energy-absorbing piezoelectric ceramic respectively, the other end of the energy-absorbing piezoelectric ceramic is connected with one end of the impedance matching circuit, the other end of the impedance matching circuit is connected with the metal elastomer, and driving teeth distributed at equal intervals are arranged in the middle of the upper surface of the metal elastomer. The driving teeth are arranged between the metal elastic body and the rotor; compared with a traditional linear traveling wave ultrasonic motor, the traveling wave type linear ultrasonic motor with the fixed end and the energy consumption structure is simpler and more compact in structure, high in traveling wave component proportion and high in electromechanical energy conversion efficiency.

The invention relates to a cage barrier spliced outer rotor stator electro-magnetic synchronous motor and a control method thereof. The motor is characterized in that an outer rotor is positioned outside a stator, a three-phase armature winding and a single-phase exciting winding are arranged in slots of the outer surface of the stator, and the same cage barrier outer rotor modules are connected with a sleeve made of a non-permeability magnetic material through positioning slots and spliced in a circumferential direction to form the outer rotor with inner salient pole types; the inner surface of each cage outer rotor module is provided with radial trapezoid-shaped slots which have multiple step slot widths along a radial direction, and short circuit cage bars are arranged in the slots; after the adjacent rotor modules are spliced, common trapezoid-shaped slots are formed on connection parts of the modules, gaps of the bottoms of the slots reach the inner surface of the sleeve, the slots have multiple step slot widths along the radial direction, and common cage bars are arranged in the slots; and the invention aims to provide the cage barrier spliced outer rotor stator electro-magnetic synchronous motor which is convenient to process and manufacture, can realize the stator-side excitation, and has high power density and the excellent steady state and dynamic performance.