45results about How to "Small leakage reactance" patented technology

The dc-drive hybrid-excitation dual-stator wind-driven generator comprises: the dual-stator part including an inner/outer stator (4, 1) and inner stator frame (5), the excitation winding part including a winding (12) and winding frame (10), and a rotor including a cup rotor (8), an inner/outer permanent magnet (3, 2), a rotor yoke (11), and a rotation shaft (7). This invention cancels gear box, can adjust air gap magnetic field conveniently, and benefit to catch the maximal wind energy.

The invention is a power-electronic short-circuit trouble current limiter, composed by using a variable impedance to replace bypass inductance and transformer in the existing short-circuit trouble current limiter. As compared with existing techniques, it not only omits the bypass inductance but also need not design according to working conditions of common transformer because the variable impedance transformer allows the magnetic circuit to enter saturation as short-circuiting, number of turns, iron core section area of the variable impedance transformer, etc, can largely be reduced, the weight, bulk and cost are remarkably reduced, and simultaneously because of the saturation of the transformer iron core and the increase of leakage impedance, the inductance quantity of current limiting impedance can be reduced, making the overcurrent level remarkably reduced. The invention can implement the industrialized wide application of the shor-circuit current limiter to single-phase and three-phase power systems.

The invention discloses a less-rare-earth multi-excitation-source double-stator flux-switching memory motor, which belongs to the technical field of motor body design and operating principles. Coaxial outer stators, rotors and inner stators are sleeved together in turns from outside to inside to compose the memory motor, wherein a radial air gap exists between the outer stators and the rotors, the rotors and the inner stators, the outer stators are composed of armature core teeth, fault-tolerant teeth and stator yokes, and the rotors are composed of a rotor support, a magnetic silicon steel block and a magnetic insulation block, and meanwhile, the inner stators are composed of the inner stator core and a combined permanent-magnet cell block. The double-stator structure of the motor realizes the separation of armature winding and permanent magnet and solves the problem that multiple excitation sources inside the traditional flux-switching permanent magnet motors restrain each other, thereby easily increasing motor power density and torque density. The memory motor maintains high air-gap flux density and ensures of the motor power density and the torque density, meanwhile, the consumption of rare-earth permanent-magnetic materials is effectively lowered. On the other side, the memory motor can realize flexible adjustment of a motor air-gap field and expand the range of speed operation.

The invention aims to disclose a permanent magnet synchronous motor used for an air conditioner compressor. The permanent magnet synchronous motor comprises a rotor and a stator, wherein the rotor is in an embedded magnetic steel structure; a rotor sheet is provided with through grooves of which the number is the same as that of poles of the motor; the through grooves are connected through narrow strips; and symmetrical chamfered edges are arranged in an inner arc of teeth of the stator sheet. Compared with the prior art, with the adoption of groove-shaped design of the stator and the rotor in a concentrated winding, the sine property of the concentrated winding motor can be improved, and leakage reactance can be reduced, so as to obtain higher power factors and efficiency; and in addition, the tooth socket torque can be reduced, the low-speed loading capacity is improved when the position of the air conditioner is not controlled, and the purposes of the invention can be realized.

The invention discloses a series hybrid electric energy quality controller. The series hybrid electric energy quality controller comprises a transformer, a voltage source type inverter, a modulation signal generation module and a simplified passive filter, wherein the primary side winding of the transformer is connected between a power supply and a nonlinear load in series; the secondary side winding is connected with the output end of the voltage source type inverter in parallel; the modulation signal generation module is used for generating fundamental waves and specific sub-harmonic modulation control signals and sending the fundamental waves and the specific sub-harmonic modulation control signals to the voltage source type inverter; the voltage source type inverter is used for generating an alternating current signal at the same frequency as the modulation signal and sending the alternating current signal to the secondary side winding of the transformer; the primary side winding of the transformer presents low impedance to the fundamental waves, presents higher impedance to the specific sub-harmonics and presents high impedance to the harmonics besides the specific sub-harmonics; and the simplified passive filter presents high impedance to fundamental waves, and presents low impedance to the specific sub-harmonics. The series hybrid electric energy controller is relativelylow in cost, more practical and high in system stability and reliability.

The invention relates to a power-frequency AC withstand voltage detection method, and belongs to the technical field of power-frequency withstand voltage detection. Preliminary estimation is made according to the test voltage and capacity of a tested sample, and a proper test voltage regulating device and related equipment are selected; power supply of the tested sample is cut off, and all relatedconnecting lines are dismounted or disconnected; environment condition including the atmospheric pressure and temperature during test is recorded; and a horizontal adjusting screw in the bottom of anelectrostatic voltmeter is adjusted till a sprit level indicates that the electrostatic voltmeter is in a horizontal position, and proper measuring ranges are selected for related instruments. The technical ideal is clear, the method is convenient to realize, the voltage can be regulated smoothly, an output voltage higher than an input voltage can be obtained, the method also has advantages of low leakage reactance, low loss and low waveform distortion, a tested device is avoided from undue insulating breakdown during AC withstand voltage, maintenance time is shortened, and the service life of equipment is prolonged.

The invention provides a permanent magnet synchronous machine (PMSM) possessing an assembled magnetic effect. The PMSM comprises a stator and a rotor. Air gaps exist between the stator and the rotor. The stator includes a stator core and a stator winding. The rotor includes a rotor core, a rotating shaft and permanent magnet steel. The stator winding is a centralized winding. The rotor is an eccentric rotor. Ends of the permanent magnet steel are directly connected with each other. The air gaps between the stator and the rotor are non-uniform air gaps. The invention has the following positive effects that: (1) distribution of air-gap flux density can be optimized through improving a rotor structure and the air gap flux can be very close to a sinusoidal waveform by using the non-uniform air gaps; (2) magnetic flux leakage on the ends can be effectively reduced because the ends of the permanent magnet steel are directly connected with each other, and simultaneously a magnetic isolation bushing is not needed to be installed on a rotating shaft side so that a requirement of a rotating shaft material can be reduced, wherein the rotating shaft can adopt a magnetic conductive material and/or a non magnetic conductive material.

The invention discloses a power distribution network neutral line zero sequence harmonic suppression device with a changed iron core structure. The device comprises a zero-sequence filter, the zero-sequence filter comprises four core columns and six windings, the winding numbers of the windings are same, the core columns are parallel to one another, the included angle between a first parallel plane and a second parallel plane, the included angle between the first parallel plane and a third parallel plane and the included angle between the second parallel plane and the third parallel plane are all 120 degrees, the first parallel plane is composed of the first core column and the second core column, the second parallel plane is composed of the first core column and the third core column, the third parallel plane is composed of the first core column and the fourth core column, three windings are wound around the first core column, and the other core columns are each provided with one winding in a winding mode; each winding phase is divided into two half windings which are located on two different core columns respectively, each phase of voltage is obtained by reversely connecting the two half windings located on the different core columns, the leading-out ends of three lower half windings are in short connection with one another and then are connected to a power grid neutral line, and three upper half windings are directly connected with a three-phase power grid in parallel. Accordingly, a low-resistance channel is provided for zero-sequence harmonic currents of a power distribution network, and then the zero-sequence harmonic currents in the power distribution network neutral line are filtered out.

The invention discloses a radial magnetic field stator yoke-free double-rotor disc type permanent magnet synchronous motor. The motor comprises a stator, an outer rotor, an inner rotor, a rotor support, a rotating shaft, a front bearing, a rear bearing, a front end cover, a rear end cover and a housing. The stator is composed of a stator iron core and a stator winding. The outer rotor is composedof an outer rotor iron core and outer magnetic steel. The inner rotor is composed of an inner rotor iron core and inner magnetic steel. The rotor support is connected with the outer rotor, the inner rotor and the rotating shaft, the rotating shaft is supported by the front bearing and the rear bearing, the front end cover is connected with the stator iron core and the housing and provided with a bearing chamber and a cooling liquid water channel, the rear end cover is connected with the housing and provided with a bearing chamber, and the outer magnetic steel and the inner magnetic steel are permanent magnets. The radial magnetic field stator yoke-free double-rotor permanent magnet disc type motor has the outstanding advantages of high peak torque density, high efficiency, small size, light weight and disc-type thin appearance, and is particularly suitable for being used as an electric vehicle wheel edge driving motor, a hub motor, an integrated generator and the like.

The invention discloses a radialskewed slot rotor and a motor applying the same. The motor applying the radial skewed slot rotor comprises theradial skewed slot rotor. Theradial skewed slot rotorcomprises a rotating shaft, a plurality of rotor punching sheets and conducting bars, and the radial skewed slot rotor is mainly formed by coaxially laminating the plurality of rotor punching sheets, wherein a shaft hole is formed in the axis position of each rotor punching sheet, the position of a rotor notch is not changed, the center line of the rotor groove of the outer circle inclines by a certain angle along the radial direction of the rotor punching sheet to form an inclined rotating groove, and the plurality of rotating grooves are uniformly distributed along the circumference. The radial skewed slot rotor and the motor applying the radial skewed slot rotor can be directly applied to an existing asynchronous motor, and compared with an axial skewed slot rotor motor which is widely used at present, the equivalent slot depth and the equivalent guide bar length of the manufactured radial skewed slot rotor motor are reduced, so that the total leakage reactance value of the radial skewed slot rotor motor is reduced, the loss and the size of reactive current in the rotor are reduced, and the effects of improving the efficiency and the power factor and increasing the overload capacity are achieved.

The present invention relates to the motor technology field, in particular to a winding stator used for an air-conditioning outdoor fan motor and a manufacturing method thereof. The winding stator comprises a stator punching and windings, the stator punching is characterized in that a plurality of punching blocks are connected orderly and mutually to form a straight bar structure, and the inner sides of the punching blocks protrude the groove-shaped teeth parts integrally and inwards. The insulating frames are fixed on the front and back end faces of the stator punching respectively, the wires of the windings are wound on the groove-shaped teeth parts of the punching blocks orderly to bend the punching blocks inwards orderly along the connection positions, so that the stator punching forms a circular structure, and the two ends of the stator punching are welded and fixed mutually. According to the present invention, a bar-shaped stator centralized winding structure is adopted, the end part loss of the windings and the copper consumption are little, the manufacturing cost is reduced directly, the end part heights of the windings of the motor can be reduced effectively, the end part leakage reactance, the motor loss and the technology difficulty are reduced, a production technology is simplified, the automatic production is easy to realize, and the production efficiency is improved.

The invention relates to a coil assembly of a current transformer. The coil assembly comprises two superimposed coil windings. Each coil winding comprises a main ring iron core, a first insulation layer wrapped on the main ring iron core, a coil wound on the first insulation layer, a compensating ring iron core arranged inside the coil, a second insulation layer wrapped on the compensating ring iron core and a third insulation layer wrapped on the coil. The two coil windings are wrapped by a sponge layer. The sponge layer is wrapped by a fourth insulation layer. Incoming leads of the two coil windings are connected to form a wire incoming end; and outgoing leads of the two coil windings are connected to form a wire outgoing end. The wire incoming end and the wire outgoing end pass through the sponge layer and the fourth insulation layer in sequence and are exposed out of the fourth insulation layer; and the wire incoming end and the wire outgoing end are provided with an incoming copper insert and an outgoing copper insert respectively. The coil assembly has the advantages of simple structure, stable and reliable performance, low production cost and high qualified rate.

The invention provides a permanent-magnet synchronous motor adopting a concentrated winding, comprising a stator and a rotor. An air gap is formed between the stator and the rotor, the stator comprises a stator core and a stator winding, and the rotor comprises a rotor core, a rotating shaft and a permanent-magnet steel magnet. The permanent-magnet synchronous motor is characterized in that that stator winding is an integrated winding, the rotor is an eccentric rotor, and the air gap between the stator and the rotor is an uneven air gap. The invention has the advantages of less materials consumption, simple structure, convenient production and light weight, reduces the additional loss of motor energy and improves the utilization rate of the motor energy.

The embodiment of the invention discloses a rotor punching plate which comprises a rotor punching plate body, wherein toothed slots used for winding a rotor coil is formed in the periphery of the rotor punching plate body; a rotor tooth part is formed between every two adjacent toothed slots; each rotor tooth part is a trapezoid tooth; the end, away from the circle center of the rotor punching plate body, of each rotor tooth part is wider than the other end. The rotor punching plate has the advantages of parallel slots and parallel teeth, the starting current of a motor can be reduced, the starting performance is improved, the skin effect of the motor is enhanced, the added loss of the motor is reduced, and the performance of the motor is integrally improved; besides, the slots are narrow and deep, the leakage reactance at slot openings is less, and the current is greater, so that the skin effect of the current is achieved, and the starting torque is increased. The invention also discloses a motor rotor and a motor.

The invention relates to a winding, a stator and a motor. The winding comprises: a plurality of coils; each coil comprises a double-layer conductor module, a first conductor and a connecting conductormodule; the double-layer conductor module is connected with the first conductor through the connecting conductor module; the double-layer conductor module comprises a second conductor and a third conductor; and the connection conductor module comprises a first connection conductor and a second connection conductor. The second conductor and the third conductor are vertically arranged side by side,the output end of the second conductor is connected with the input end of the first conductor through the first connecting conductor, and the output end of the first conductor is connected with the input end of the third conductor through the second connecting conductor. According to the invention, the second conductor and the third conductor are arranged side by side up and down, so that the twoconductors have a capacitance effect under high-frequency pulse potential excitation, the loss is reduced when current flows through the conductors, the electrical load density of the motor can be improved, and the high density of the motor is realized.

A motor for reducing mechanical losses by decreasing a base size is provided and comprises a motor shaft passing through a rotor core. The rotor core is connected with a permanent magnet and passes through a stator core. The stator core is connected with a sleeve. The sleeve is connected to a base. The base is provided with a first connecting hole and a second connecting hole at the bottom. The distance between the first connecting hole and the second connecting hole is 406 mm. The base is connected to a front end cover. The motor shaft passes through the front end cover. The distance between the center axis of the motor shaft and the bottom of the base is 315 mm. The present invention is applied to an 110kW/3000 rpm motor.

The invention provides a reluctance rotor, a motor and a compressor. The reluctance rotor comprises a rotor iron core which comprises a magnetic steel groove; a first magnetic steel piece arranged inthe magnetic steel groove; and a second magnetic steel piece arranged on the end surface of the rotor core. The second magnetic steel piece is additionally arranged on the outer side of the magnetic steel arranged in a traditional magnetic steel groove, end leakage reactance can be reduced, the utilization rate of the magnetic steel is increased, and the electromagnetic torque proportion is increased.