1. Brief descriptionElectrical steel strips (plates) are mainly used in motor and transformer industries. They are soft magnetic materials and play a role in magnetic permeability.According to the rolling process, it is divided into cold-rolled sheet and hot-rolled sheet.According to the grain orientation, it is divided into grain-oriented steel sheet and non-oriented steel sheet.According to the silicon content, it is divided into high silicon steel plate and low silicon steel plate.Common model representation of non-oriented electrical steel sheet: 50W60050 means the nominal thickness is 0.5 (100 times the actual value)W means no orientation plate600 represents the iron loss value (100 times the actual value)2. Main testing items①Standard ratio total iron loss-----referred to as iron loss, when the magnetic induction intensity changes with time according to the sine law, its peak value is a certain calibration value, and the change frequency is a certain calibration frequency, the temperature of the iron core per unit mass is The power consumed at 20°C is defined as the standard specific total iron loss, in W/kg.②Standard magnetic induction intensity-----referred to as magnetic induction, the iron core sample from the demagnetized state, the magnetic induction intensity changes according to the sinusoidal law with time at the standard frequency, when the peak value of the AC magnetic field reaches a certain calibration value, the iron core sample magnetic The peak value of the inductance is the standard magnetic induction intensity, the unit is T.③Other test items include coating thickness, interlayer resistance, hardness, etc.
2
heat protector
1. Brief descriptionA thermal protector is a type of temperature switch that protects against overheating. There are two categories:One is a resettable temperature protector, which uses the different deformation rates of the thermal bimetal to the temperature to deform the bimetal upward or downward, so that the circuit can be turned on and off. It is a resettable type, which is disconnected when the temperature is higher than the nominal breaking temperature, and reset when the temperature is lower than the nominal reset temperature;The other is a one-time protector, also known as a fuse, which controls the circuit on and off through a low-temperature alloy filled inside. When the temperature is higher than the nominal breaking temperature (that is, the melting point of the bottom-temperature alloy), the internal low-temperature alloy Fuse, cut off the circuit. For one-time use only.2. Main testing itemsDisconnection temperature, reset temperature (resettable type), life test (resettable type), insulation resistance, withstand voltage test (withstand voltage between wire shells, line end withstand voltage)
3
Insulating paint and other insulating materials
1. Brief descriptionOur insulating varnish mainly uses self-curing epoxy resin insulating baking varnish, which is used for impregnating and insulating SP motor stators to enhance the inter-turn insulation of winding enameled wires.2. Main testing itemsCompressive strength, insulation resistance, viscosity, solid content, thick layer curing, suitability with bearings, heat resistance.3. Other insulating materials are used for wire insulation: polyester tube, yellow wax tube for winding and slot insulation: polyester film (DMD tape, NMN tape), slot wedge, polyester film, textured paper, insulating tape.
4
enameled wire
1. Brief descriptionThe main types of enameled wires used by our company are polyurethane nylon enameled wire (1UEWN, temperature index 155℃), polyester nylon enameled wire (QZ-2, temperature index 130℃), polyester imide enameled wire (QZY-2, temperature index 180℃).2. Main testing itemsBare copper characteristics: heat resistance life ---- that is, test according to the specified test method, the extrapolated life temperature of enameled bare copper wire for 20,000 hours is not lower than the specified temperature index; elongation rate, etc. Physical properties of paint film:Pinhole test----including high-voltage pinhole test, salt water pinhole test, mainly to test the number of defects of the insulating paint film on enameled wires; elongation and winding, adhesion and wear resistance.Chemical properties of paint film: including oil resistance, solvent resistance, styrene resistance.Temperature resistance test: including softening breakdown, high temperature deterioration, thermal shock.Electrical characteristic test: resistance test, withstand voltage test.Size requirements: bare copper outer diameter, paint film thickness, enameled wire outer diameter, etc.
5
Power cords, connectors, terminals
1. Brief descriptionPower cords mainly use UL series cords (UL3266, UL1430, UL1015 comply with UL standards) and RV cords (RV90, comply with national standards), all of which are polyvinyl chloride (PVC) power cords.2. Main testing itemsElectrical characteristics: conductor resistance, withstand voltage, insulation resistance.Mechanical properties: tensile strength, elongation.Other characteristics: aging, flame retardancy.3. Terminals and connectorsMainly use imported brand terminals and connectors. The test items include the material and elasticity of the terminal, the material, flame retardancy and compressive strength of the connector.
6
Anti-vibration rubber ring
1. Brief descriptionThe anti-vibration rubber ring uses the shock-absorbing damping effect of rubber to reduce the vibration generated by the operation of the motor and reduce the operating noise.2. Main testing performance items:Hardness aging performance: including hot air aging, ozone agingMechanical properties: including tensile strength, elongation, flame retardancy
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Rotor shaft, bearing
1. Brief descriptionThe rotor shaft is mainly made of high-quality carbon steel, generally 45# steel, and stainless steel can also be used for special requirements. Anti-rust surface treatment methods mainly include oiling, oxidation treatment (black and blue), and electroplating. The bearing adopts the non-contact deep groove rolling ball bearing with reliable structure and low noise.2. Main test items: Bearing: size, reliability test, life test, grease characteristic test (temperature resistance test, moisture-proof test), salt spray test, noise, vibration Rotor shaft: material composition, hardness, size (including shape Bit size) anti-rust performance (salt spray test, moisture test).
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End cap, case
1. Brief description: The end cover is mainly stamped from deep-drawn plate, and the casing is wound and formed, generally using 20# steel plate. There are several methods for surface anti-rust treatment: direct stamping of galvanized sheet; electroplating or electrophoresis treatment after production of cold-pressed sheet.2. Main testing items:sizeStrength (including material composition, tensile strength, elongation, hardness)Rust resistance
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Main testing equipment
1. Electrical aspectsWithstand voltage tester, micro-resistance tester, megameter, enameled wire pinhole test, enameled wire high voltage tester, enameled wire snap break tester, enameled wire softening tester, oscilloscope, etc.2. SizeUniversal tool microscope tester3. MaterialsVickers hardness tester, Rockwell hardness tester, Shore hardness tester, universal material testing machine4. Environmental testingSalt spray test chamber, damp heat test chamber, thermal shock test chamber, constant temperature oven
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