283 results about "Motor insulation" patented technology

The invention belongs to the technical field of insulating paint, in particular relates to an insulating paint belonging to the dual-curing field of ultraviolet curing and thermocuring. The invention is applied for motor insulation processing and has the advantages of long storage life, high curing speed, no smell, being convenient in operation, no volatilization of organic matters during curing and the like. Compared with the common dipping paint technology, the dipping technology overcomes the problems of loss and small sagging amount in the baking and solidifying process of the dipping paint; in addition, the dipping technology saves material, improves product quality and lightens environment pollution. The dipping and insulating paint has good thermostability and is suitable for common or vacuum pressure dipping paint for H and C-grade motor and electrical appliances.

The invention discloses a three-Level SVPWM method with neutral-point balancing and common-mode voltage suppression capabilities. The problem of unbalanced neutral point potential occurs when a three-phase T-type three-level inverter applied to a permanent magnet synchronous motor vector transformation control system adopts a single power supply scheme, which usually leads to performance reduction of the inverter. The three-Level SVPWM method aims to maintain neutral point balance of the three-level inverter under more complex working conditions without changing hardware structure and increasing size and cost of the inverter significantly through improving the traditional SVPWM method; the three-Level SVPWM method further improves the common-mode voltage suppression capability, reduces impact to motor insulation, prolongs the service life of the motor, reduces maintenance cost, and improves the operation stability of the motor control system; and the improved SVPWM method is suitable for digitization, and the calculation workload during the neutral point balance regulation process is small, thereby facilitating real-time control of a microcomputer system.

A sand and dust abrasion test device and a test method for a train motor insulation structure are characterized in that the device at least comprises four parts of a working box, a dust removing system, a sand spraying pressurization system and a control system, wherein the dust removing system is a circulating system, and comprises a sand and dust collecting device, a sand and dust separation device and a dust removing device; the sand and dust collecting device is mounted below the working box. Sand and dust drop in a sand and dust collecting conical hopper after sand spraying, are sucked in a pipe through a dust suction system, and then are sent in the sand and dust separation device for sand and dust separation; dust, separated from the sand and dust separation device, is sent in the dust removing device by a pipe, and is treated by the dust removing device; and sand particles, separated from the sand and dust separation device, pass through the sand spraying pressurization system, and are conveyed to a spray gun by a pipe for secondary spraying to form recycling of sprayed sand, and the spray gun is mounted in the working box.

Disclosed is an insulation deterioration detection device that can accurately detect insulation deterioration in multiple motors by a simple circuit configuration. When detecting insulation deterioration, one end A of a smoothing capacitor is connected via a first switch to ground, and the other end B is connected via a second switch to motor windings; in this condition, link voltage is measured by a voltage measuring circuit provided in a converter unit, and the measured link voltage value is transmitted to a microcomputer in each inverter unit via serial communication. Current flowing via motor insulation resistance Z₁, Z₂ is measured by a current measuring circuit provided in each inverter unit, and the microcomputer calculates the value of the insulation resistance Z₁, Z₂ from the link voltage value and the current value.

While the motor drive amplifier is not operating, electromagnetic switch contacts are held closed for a predetermined period of time, three-phase power is rectified by a rectifier circuit and a smoothing capacitor is charged. Then, the smoothing capacitor is discharged through a discharging resistor and, when a predetermined voltage is reached, a contact is closed, with the result that a closed circuit is formed by the smoothing capacitor, a detection resistor, a motor coil, motor insulation resistance, and ground. A voltage generating across the detection resistor due to leakage current is detected and compared with a reference value. If the detected voltage exceeds the reference value, an insulation degradation signal is delivered.

The invention belongs to the technical field of light-emitting semiconductor device packaging materials, and relates to a silicon-containing epoxy resin composition for a light-emitting diode (LED) package and a preparation method thereof, in particular relating to a silicon-containing resin composition which has the advantages of low viscosity, ultraviolet curing, rapid low-temperature thermocuring, extremely high light transmittance and good thermal stability and mechanical strength and a preparation method thereof. The alicyclic epoxy resin packaging material is mainly characterized in that rapid curing is carried out at the low temperature, and the ultraviolet curing is adopted; before the curing, the viscosity is extremely low, and processing manufacturability is good; and after the curing, the light transmittance is extremely high, and the thermal stability and mechanical strength are good. The silicon-containing epoxy resin composition can be used for the LED packaging materials, and can also be used for paints, binders, integrated circuit package and epoxy vacuum pressure impregnated materials for motor insulation.

The invention discloses a preparation method of aramid nanofiber/mica composite insulating paper. The preparation method of the aramid nanofiber/mica composite insulating paper aims at achieving the self-film-forming coating and interface enhancement effects of aramid nanofibers on mica by turning macro aramid fibers into aramid nanofibers through deprotonation and utilizing an in-situ depositionmethod, achieves that the adaptability of the particle diameter of the mica is wide, and the uniformity, mechanical strength and dielectric strength of the aramid nanofiber/mica composite insulating paper are much higher than the properties of common aramid mica insulating paper, solves the problems of existing aramid mica insulating paper during wet papermaking that (1) the particle diameter of the mica is limited by the properties, (2) the mechanical strength is low, (3) due to voids and pore diameters which are generated by free accumulation and distribution of the mica, the dielectric strength is low, (4) the two faces of paper forming have large difference and low uniformity, is simple in operation, has a significant effect, and provides a novel method for the preparation of a motor insulation material with higher performance.

The invention provides an anticorrosive composite coating of a motor. The anticorrosive composite coating of a motor is positioned on the surface of the insulation structure of the motor, and is formed by compounding a base layer, an interface layer and a surface layer, and the base layer is obtained by directly spraying an acrylic acid/epoxy resin priming paint on the surface of the insulation structure of the motor; the interface layer is obtained by spraying an epoxy resin paint on the obtained first coating (base layer); and the surface layer is obtained by spraying an organosilicon polyurethane resin paint on the interface layer. The anticorrosive composite coating of the motor can effectively resist salt spray, moist, solvents, radiation, low temperature, hot and cold impact, wear and the like.

The invention discloses an online monitoring method for insulation of a three-phase asynchronous alternating current motor stator. The online monitoring method comprises the following steps of synchronously collecting voltage and current signals of a motor insulation system; using a PWM (pulse width modulation) demodulation technique to process the collected voltage and current signals of the motor; extracting feature indexes of the processed signals, such as a MCSA (motor current signature analysis) feature index, a current signal statistical mode identification index, a sequence voltage distribution statistical index, a Park conversion feature index, a three-phase alternating current voltage difference statistical index and a three-phase alternating current difference statistical index; using each extracted index as a training set of a support vector machine to pre-diagnose the state, outputting the comprehensive state pre-diagnosis result of the motor insulation system, and evaluating the running state of the motor insulation system on line. The online monitoring method for the motor insulation system has the advantages that the motor insulation state can be effectively monitored for a long time; by integrating multiple types of insulation feature indexes, the reliability and monitoring precision of the method are improved, and the data processing precision is high.

A rocket motor insulation is formed of a solid EPDM rubber, a liquid EPDM rubber, an inorganic hydrophilic filler, and polyaramide fiber in place of asbestos of the conventional insulation. The hydrophilic filler takes the form of powder. The fine particles of the filler powder are encapsulated with a rubber material. The encapsulated particles of the filler are provided with protection against interference by moisture contents of other ingredients of a compounding recipe, relative humidity of a processing environment, and a shearing stress brought about in the course of preparation. The vulcanized end product of the insulation has an excellent physical property of ablative resistance.

The invention discloses a variable-frequency and variable-speed motor comprising a motor body, a heat radiator and a frequency converter electrically connected with the motor body, wherein the frequency converter comprises a master control board, a driving board and a power element which are electrically connected; the variable-frequency and variable-speed motor is an assembly of the frequency converter and the motor body; and the heat radiator is arranged on an end cap at the tail of the motor body and comprises a cap body and an containing part with an opening at one end, wherein the cap body is arranged at the opening of the containing part, a containing cavity is formed between the cap body and the containing part, heat radiating fins are formed at the outer periphery of the containing part, the inner side of the cap body is provided with the master control board of the frequency converter, the bottom at the inner side of the containing part is provided with the driving board of the frequency converter, insulating boards are all arranged between the master control board and the cap body and between the driving board and the containing part, and the inner side periphery of the containing part is provided with the power element of the frequency converter. The variable-frequency and variable-speed motor can realize the effects of reducing the on-site used space and prevent overshoot voltage generated by a power wire of the motor from destroying the insulation of the motor and effectively reduces the radiation of electromagnetic waves.

The present invention discloses a three-phase AC motor driving system suppressing common-mode noise, wherein the system comprises two sets of three-phase inverters, an additional load circuit, a driving control circuit, a sampling feedback circuit and two additional parallel bridge arms and correspondingly coupling inductors. Based on the control system, the present invention provides a common mode noise suppression method, which can reduce the common mode current and EMI noise generated by a general inverter driving motor when the maximum DC bus voltage utilization rate is achieved so as to suppress the problems of continuing damaging the components of motor insulators and bearings, thus resolving the technical problem of common-mode noise of an inverter-driven three-phase AC motor. The system of the invention can select an additional bridge arm with a small capacity and low cost switch tube, and can achieve the beneficial effects of reducing the common mode current, suppressing the common mode noise, protecting the motor winding and the bearing insulation, and improving the system reliability.

Insulation for a rocket motor is provided, as is a method for insulating a rocket motor. The insulation includes a cured elastomer and vapor grown carbon fibers dispersed in the cured elastomer. The cured elastomer is preferably formed from a precursor composition comprising an EPDM terpolymer. Generally, the vapor grown carbon fibers have an internal graphitized tube surrounded by a sheath of vapor deposited amorphous carbon.

The invention relates to a motor insulating bearing device and a manufacturing method thereof. The bearing device is characterized in that an insulating bushing is positioned at a circumference part between a bearing pedestal and a motor bearing, insulating space rings are arranged between the end of the insulating bushing and the motor bearing and an outer bearing cover and between the end thereof and an inner bearing cover, and a gap is left between the insulating space ring and the insulating bushing. The motor insulating bearing device is manufactured by a unique method, the formation of rotor axial current loop is prevented effectively and the electric corrosion damage of the motor bearing is avoided, thereby ensuring the reliable operation of the motor, prolonging the service life of the motor and decreasing the reactive power loss of the electric energy at the same time; the motor insulating bearing device has the advantages of reasonable structure design, reliable operational performance and convenient installation and maintenance, etc.

An insulator structure of a motor, includes: a stator core having a plurality of protruding tooth portions which are disposed along an inner periphery of the stator core or an outer periphery of the stator core; a pair of first and second insulators respectively mounted to a first end portion and a second end portion in an axial direction of the stator core, wherein a plurality of cover portions are provided for each of the pair of the first and second insulators so as to cover the plurality of the respective tooth portions; and a winding wound around a tooth portion of the tooth portions covered with the respective cover portions, the winding being capable of causing a magnetic force to the tooth portion by an energizing; wherein with the pair of the first and second insulators, the cover portion's second head end portion in an axial direction of the first insulator in the axial direction and the cover portion's first head end portion in an axial direction of the second insulator in the axial direction mate with each other, the cover portion having the head end portion in the axial direction provided with a first fitting portion and the cover portion having the head end portion in the axial direction provided with a second fitting portion fittable with the first fitting portion are provided for each of the pair of the first and second insulators, the cover portion provided with the first fitting portion and the cover portion provided with the second fitting portion are so disposed as to face each other in such a configuration as to interpose therebetween a center axis of the stator core, and the first insulator and the second insulator which is substantially the same as the first insulator in configuration and is reversed in the axial direction are configured to face each other, such that the first fitting portion of the first insulator mates with the second fitting portion of the second insulator.

The invention belongs to the technical field of insulation warmish. The halogen-free flame retardant heat conduction insulation warmish is characterized by using a high-conduction insulation filler and a flame retardant agent with high flame retardance as modifying agents, the modifying agent is filled in heat resistant unsaturated polyester resin, a reactive diluent, a peroxide initiator and an additive are added, and are uniformly mixed to obtain the flame retardant heat conduction insulation warmish which is cured at a temperature of 100-180 DEG C. The flame retardant heat conduction insulation warmish is applied to motor insulation, and has the advantages of high heat conduction property, good flame retardance, excellent salt mist property, good insulation property, long storage period, high curing speed and the like. The flame retardant heat conduction insulation warmish comprises the components in percent by weight of 30-50 percent of heat-resistant unsaturated polyester resin, 10-30 percent of diluting agent, 15-30 percent of heat conduction filler, 15-20 percent of fire retardant, 1-2 percent of initiator and 0.2-1 percent of additive. The halogen-free flame retardant heat conduction insulation warmish formed after curing has a heat conduction coefficient of exceeding of 0.03540W/Mk and fire resistance of reaching ULV (Ultra Low Voltage)-0 level.

The present invention discloses a formula for a solvent-free impregnating varnish. The formula comprises the following components, by mass, 55-60% of 308 heat resistant unsaturated polyester resin, 8-12% of epoxy resin, 0.04-0.08% of an accelerating agent, 0.01-0.015% of hydroquinone, 0.5-1.5% of an initiator and 30-35% of styrene. According to the present invention, the formula for the solvent-free impregnating varnish for the motor insulation impregnating is mainly designed; the hydroquinone is selected to improve the storage property of the product; the 308 heat resistant unsaturated polyester resin is selected to improve the heat resistance; the F44 epoxy resin is selected to increase the hardness of the varnish film; with the formula provided by the present invention, the heat resistant grade can reach the class H; the solvent-free impregnating varnish with characteristics of excellent electrical property, high mechanical strength, good moisture resistance, low curing temperature, high adhesion, and good storage stability can be prepared.

A composition of elastomeric insulation is provided. This composition is suitable to be used as a non-asbestos insulation in a solid rocket motor. In this embodiment, an EPDM rubber, a polyaramide fiber, a liquid EPDM rubber and an aluminum hydroxide are used to substitute the hazardous asbestos in traditional insulation materials to prevent environmental contamination. With careful formulation control, density of the composition based on this embodiment can be tailored to lower than 1.0 gm/cm³. Thus enable the insulation to be especially applicable in the areas of lower ablation rate in a solid rocket motor to reduce tare weight of the rocket motor. Moreover, since no chlorinated organic fire retardant compound is used therein, the additional advantage of low smoke density and low smoke toxicity is exhibited.

The invention provides a design method of a middle-long line transmission filter of a motor drag system. The method involves that an LCR-type filter structure is adopted on the side of an inverter to lower the amplitude of voltages arriving at the motor end and the corresponding dv/dt, so that the requirement of motor insulation is met. The method specifically includes the following four steps of determining the size of an output inductor L, determining the size of a filter resistor R, determining the size of a filter capacitor C and conducting parameter modification. By means of the design method, a unified theory is provided for the design method of the filter on the side of the inverter according to the working condition that long line drive is adopted in motor drag control, and the design of the dv/dt filter can be guided more thoroughly; by the adoption of the LCR-type filter, the advantages of being simple in structure, low in cost, small in size, obvious in overvoltage restraining effect and the like.

The invention relates to a low-voltage efficient motor high heat conduction and insulation structure and a manufacturing method thereof. The insulation structure in a motor comprises a stator iron core, a slot wedge, and motor insulation paper, wherein the stator iron core is a high heat conduction stator iron core with a winding, the iron core is of a high heat conduction compound insulation paste impregnating insulating structure, the slot wedge is of a high heat conduction drawing slot wedge insulation structure, and the motor insulation paper is high heat conduction compound insulation paper. The method for manufacturing the high heat conduction compound insulation paste, a drawing slot wedge, the high heat conduction compound insulation paper and the high heat conduction stator core dipping with the winding is provided according to the insulation structure. Due to the fact that the high heat conduction insulation compound paste is used in the low-voltage motor stator iron core, the slot wedge and the motor insulation paper, the heat conduction coefficient of the low-voltage motor can be improved to 0.3-0.4163W/(m. k), and the insulation meets the F level and H level motor insulation requirements. The purposes of reducing the motor loss, improving efficiency and reducing the heat emitting quantity and temperature rising are achieved. The stability and the reliability of working of the machine can be improved, and the service life of the motor is prolonged.

A high-power variable frequency motor insulation bearing sleeve comprises a motor shaft, a bearing, a bearing inner cap, a bearing outer cap, an oil baffle ring and a baffle ring, wherein an insulation sleeve is arranged out of the bearing. The high-power variable frequency motor insulation bearing sleeve is characterized in that the insulation sleeve comprises an inner insulation spacer arranged between the bearing and the bearing inner cap, an outer insulation spacer arranged between the bearing and the bearing outer cap, a rear end cap arranged out of the bearing, and a gap insulation strip and a glass fiber insulation layer arranged between the rear end cover and a bearing seat. Three insulation strips are respectively arranged on the left side, the right side and the outer circle of the bearing, can effectively cut off a loop of a motor shaft current, and prevent the motor shaft current from forming a current loop through a motor bearing end cap and a motor base to destroy bearing balls, raceway surface roughness and oil film, and furthermore the bearing is protected. In addition, the insulation strips are simple in structure, convenient to manufacture, low in cost, and convenient to replace, and therefore manufacturing cost of a motor is reduced, and production cycles of motor forming products are guaranteed.

The invention relates to a motor insulation system for nuclear power units, comprising an electromagnetic coil wound with a nuclear radiation and high temperature-resistant electromagnetic wire, a slot insulation, a slot wedge, an insulation casing, a binding tape, a lead wire, and nuclear radiation and high temperature-resistant insulation impregnating varnish integrally impregnating for heat conduction. The motor insulation system for nuclear power units of the invention has good high temperature-resistant and nuclear radiation-resistant performances, can be applied to war industry, aviation and aerospace, nuclear power motors and other insulation technical fields, and is particularly suitable to be used as a motor insulation system for nuclear power main pumps with the rated voltage being 1140V and below.

The invention discloses a 6 kilovolt level high-voltage motor insulation structure and a manufacturing method of the insulation structure. The insulation structure comprises an electromagnetic coil provided with a guide line insulating layer, and a main insulating layer manufactured on the electromagnetic coil in a winding mode. Epoxy acid anhydride type impregnating resin condensates are arranged in a gap between the guide line insulating layer on the electromagnetic coil and the main insulating layer. The 6 kilovolt level high-voltage motor insulation structure and the manufacturing method of the insulation structure have the advantages that insulating strength of the guide line insulating layer and the main insulating layer are both greatly promoted, but insulating thickness of the guide line insulating layer and the main insulating layer are obviously thinned.