Vacuum desorption, impregnation and curing system, vacuum desorption device, and vacuum desorption process for protective layer of magnetic pole

Abstract

A process and process apparatus for forming a protective coating on a magnetic pole of a permanent magnet motor. The process for forming a protective coating on a magnetic pole of a permanent magnet motor includes: horizontally placing a motor rotor, and controlling to perform, at positions of an inlet and an outlet operating on a vacuum bag in a current state, vacuumization and adhesive injection only on an arc section located at the bottom of the motor rotor; and driving the motor rotor to rotate by a predetermined angle after the adhesive in the arc section is initially cured so as to rotate the next arc section in which no adhesive is injected to the bottom, until all arc sections in the circumferential direction of the motor rotor are injected with the adhesive.

1 . A vacuum desorption process for a protective layer of a magnetic pole, comprising:
 performing, before injection of an impregnation liquid, vacuum desorption on a sealed system formed by a magnetic yoke and a vacuum bag, and   establishing a functional relationship about a vacuum degree or pressure in the sealed system for controlling a procedure of the vacuum desorption,   wherein parameters in the functional relationship comprise an average suctioned gas volume flow of a vacuum pump, duration of vacuumization, an initial pressure in the sealed system, as well as an initial volume of the sealed system.   
     
     
         2 . The vacuum desorption process for a protective layer of the magnetic pole according to  claim 1 , wherein the parameters for establishing the functional relationship further comprise an initial temperature of gas in the sealed system as well as a current temperature during the vacuumization. 
     
     
         3 . The vacuum desorption process for a protective layer of the magnetic pole according to  claim 1 , wherein the parameters in the functional relationship further comprise a polytropic index of a thermodynamic polytropic procedure; or,
 the parameters in the functional relationship further comprise a polytropic index of a thermodynamic polytropic procedure as well as an initial density and a current density of gas in the sealed system.   
     
     
         4 . The vacuum desorption process for a protective layer of the magnetic pole according to  claim 2 , wherein the parameters in the functional relationship further comprise an altitude at which the sealed system is located, the initial pressure in the sealed system is determined by the altitude and a standard atmospheric pressure at sea level, and an initial temperature in the sealed system is determined by the altitude and a standard air temperature at sea level. 
     
     
         5 . The vacuum desorption process for a protective layer of the magnetic pole according to  claim 3 , wherein the parameters in the functional relationship further comprise an altitude at which the sealed system is located, and the initial pressure in the sealed system is determined by the altitude and a standard atmospheric pressure at sea level, and the initial density is determined by an initial relative humidity, an initial temperature, the initial pressure, and a partial pressure of water vapor in saturated wet air. 
     
     
         6 . The vacuum desorption process for a protective layer of the magnetic pole according to  claim 5 , wherein the vacuum degree required for the desorption is determined by conducting a test, and the duration required for the vacuumization is determined according to the functional relationship as well as the initial temperature, the initial pressure and the initial relative humidity during actual vacuum desorption,
 wherein the average suctioned gas volume flow of the vacuum pump is adjusted for adjusting suction duration.   
     
     
         7 . (canceled) 
     
     
         8 . The vacuum desorption process for a protective layer of the magnetic pole according to  claim 1 , wherein pressure in the sealed system is monitored in a real time manner, and mutual verification is performed between a procedure of controlling the vacuum desorption according to the functional relationship and a procedure of monitoring the pressure in the sealed system in a real time manner. 
     
     
         9 . The vacuum desorption process for a protective layer of the magnetic pole according to  claim 1 , wherein subsequent to or at the same time with the vacuum desorption, heated and dried air is passed into the sealed system. 
     
     
         10 . The vacuum desorption process for a protective layer of the magnetic pole according to  claim 1 , wherein before the impregnation liquid is injected, the sealed system is further subjected to a heating desorption treatment and/or an ultrasonic desorption treatment. 
     
     
         11 . A vacuum desorption, impregnation and curing process for a protective layer of a magnetic pole, comprising steps of:
 assembling a pressing strip and a magnet steel to corresponding positions of a wall surface of a magnetic yoke and mounting a vacuum bag to the wall surface of the magnetic yoke, wherein the vacuum bag and the wall surface of the magnetic yoke form a sealed system;   performing the vacuum desorption process according to  claim 1  in the sealed system; and   after the vacuum desorption, injecting an impregnation liquid into the sealed system in an vacuumized state.   
     
     
         12 . The vacuum desorption, impregnation and curing process for a protective layer of the magnetic pole according to  claim 11 , wherein when the impregnation liquid is injected in the vacuumized state, the vacuum pump is adjusted for allowing an average suctioned gas volume flow to increase for a predetermined time and then decrease for another predetermined time, and a procedure of increasing and then decreasing of the average suctioned gas volume flow is repeated a plurality of times. 
     
     
         13 . The vacuum desorption, impregnation and curing process for a protective layer of the magnetic pole according to  claim 11 , wherein after the impregnation liquid is injected, a curing step is performed, a temperature increase control, a constant temperature control and a temperature decrease control are performed in a listed sequence during the curing step, and during decrease of temperature, the average suctioned gas volume flow of the vacuum pump is adjusted, which allows the average suctioned gas volume flow to gradually decrease. 
     
     
         14 . A vacuum desorption device for a protective layer of a magnetic pole, wherein a magnetic yoke and a vacuum bag form a sealed system, and wherein the vacuum desorption device comprises:
 a controller; and   a vacuum pump configured to perform vacuum desorption on the sealed system,   wherein the controller is pre-stored with a functional relationship about a vacuum degree or pressure in the sealed system to control a procedure of the vacuum desorption, and parameters in the functional relationship comprise an average suctioned gas volume flow of the vacuum pump, duration of vacuumization, an initial pressure in the sealed system and an initial volume of the sealed system.   
     
     
         15 . The vacuum desorption device for the protective layer of the magnetic pole according to  claim 14 , further comprising:
 a temperature sensor which is configured to detect an initial temperature in the sealed system and a current temperature in the sealed system during the vacuumization and to output the initial temperature and the current temperature to the controller, and   wherein an expansion procedure of gas suctioned out by vacuumization is a variable temperature procedure, and the parameters in the functional relationship further comprise the initial temperature and the current temperature of the sealed system.   
     
     
         16 . The vacuum desorption device for the protective layer of the magnetic pole according to  claim 14 , further comprising:
 a pressure sensor which is configured to detect a current pressure in a procedure that the sealed system is vacuumized; or   a densimeter configured to detect an initial density and a current density, and   wherein an expansion procedure of gas suctioned out by vacuumization is a variable temperature procedure, and the parameters in the functional relationship further comprise a polytropic index of a thermodynamic polytropic procedure.   
     
     
         17 . The vacuum desorption device for the protective layer of the magnetic pole according to  claim 16 , wherein the parameters in the functional relationship pre-stored in the controller further comprise an altitude, the initial pressure in the sealed system is determined by the attitude and a standard atmospheric pressure at sea level, and the initial density is determined by an initial relative humidity, an initial temperature, the initial pressure and a partial pressure of water vapor in saturated wet air. 
     
     
         18 . The vacuum desorption device for the protective layer of the magnetic pole according to  claim 14 , wherein the vacuum pump is provided with a variable frequency governor to adjust the average suctioned gas volume flow of the vacuum pump,
 the vacuum desorption device for the protective layer of the magnetic pole further comprises an air heater and an air inlet filter which are in communication with the sealed system,   wherein air enters the sealed system under an action of the vacuum pump after passing through the air heater and the air inlet filter,   wherein an outlet air filter and/or a desorption process measurement device is provided between the sealed system and the vacuum pump, and the desorption process measurement device is configured to detect a content of water vapor in the air.   
     
     
         19 - 20 . (canceled) 
     
     
         21 . The vacuum desorption device for the protective layer of the magnetic pole according to  claim 14 , further comprising:
 a heating device and/or an ultrasonic device,   wherein the heating device and/or the ultrasonic device is configured to perform a heating desorption treatment on the sealed system,   wherein the heating device is at least one of a microwave heating device, a far-infrared heat source and an electric heating film, the electric heating film is laid at a wall surface of the magnetic yoke, and a heat insulation layer is laid in addition to the electric heating film at the wall surface of the magnetic yoke.   
     
     
         22 . (canceled) 
     
     
         23 . The vacuum desorption device for the protective layer of the magnetic pole according to  claim 21 , wherein two ends of the magnetic yoke are provided with sealing and shielding thermal insulation covers to enclose a microwave from the microwave heating device, and/or, wherein the microwave heating device comprises a radiant heater for inputting a microwave, and an inside surface of the radiant heater facing the sealed system is provided with a water storage sponge. 
     
     
         24 . (canceled) 
     
     
         25 . A vacuum desorption, impregnation and curing system applied to a protective layer for a magnetic pole, comprising:
 a pressing strip;   a magnet steel;   a magnetic yoke;   a vacuum bag mounted to a wall surface of the magnetic yoke, wherein the vacuum bag and the wall surface of the magnetic yoke form a sealed system; and   the vacuum desorption device according to  claim 14 .   
     
     
         26 . The vacuum desorption, impregnation and curing system applied to a protective layer for the magnetic pole according to  claim 25 , further comprising:
 a system tank configured to load an impregnation liquid,   wherein a stirrer configured to stir the impregnation liquid is provided inside the system tank,   wherein the system tank comprises a stirring tank and an output tank in communication with each other, the stirring tank is located upstream of the output tank, the stirrer is provided inside the stirring tank, and the output tank is further provided with an ultrasonic defoaming and vibrating bar.   
     
     
         27 . (canceled) 
     
     
         28 . The vacuum desorption, impregnation and curing system applied to a protective layer for the magnetic pole according to  claim 26 , wherein the stirring tank is provided with a first air outlet, the output tank is provided with a second air outlet, the first air outlet is communicated with a vacuum pump, and the second air outlet is communicated with the vacuum pump or atmosphere. 
     
     
         29 . The vacuum desorption, impregnation and curing system applied to a protective layer for the magnetic pole according to  claim 26 , wherein a heating resistor is provided inside the stirrer to heat the impregnation liquid while stirring; the stirrer is driven by an electric motor, the electric motor is provided with a hollow shaft, and a bottom end of the hollow shaft is provided with a stirring blade of the stirrer; extension wires of a winding of the electric motor extend along the hollow shaft to the stirring blade and form an electrical circuit, the heating resistor is located at the stirring blade, and the extension wires are configured to supply electric power for the heating resistor. 
     
     
         30 . The vacuum desorption, impregnation and curing system applied to a protective layer for the magnetic pole according to  claim 26 , wherein the stirrer is driven by an electric motor, the electric motor is provided with a hollow shaft, and a bottom end of the hollow shaft is provided with a stirring blade of the stirrer; an ultrasonic high-frequency vibration emission head is further provided at a bottom of the hollow shaft. 
     
     
         31 . The vacuum desorption, impregnation and curing system applied to a protective layer for the magnetic pole according to  claim 25 , further comprising:
 a microwave preheating device, which is provided between a system tank and the sealed system, for microwave heating of an impregnation liquid before the impregnation liquid is input to the sealed system, wherein the system tank is configured to load the impregnation liquid, and/or,   wherein the microwave preheating device is provided with a resin chamber, a microwave from the microwave preheating device is input into the resin chamber; the impregnation liquid in the system tank enters the resin chamber to be heated; a non-metallic screen plate is provided inside the resin chamber, the screen plate is provided with a plurality of screen openings, and the impregnation liquid is heated by the microwave after passing through the screen openings.   
     
     
         32 . (canceled) 
     
     
         33 . The vacuum desorption, impregnation and curing system applied to a protective layer for the magnetic pole according to  claim 25 , further comprising:
 an ultrasonic wave emitting device configured to apply ultrasonic vibration to the protective layer during curing, and/or,   a filling progress measurement device configured to detect a filling progress of filling with an impregnation liquid; and/or   a thickness measurement device configured to detect a thickness of the protective layer.   
     
     
         34 . (canceled)