Motor insulation systems vary considerably among the various motor manufacturers, but the following paragraphs provide a general description of the various components that comprise a typical insulation system. There are four types of varnishing methods that we will describe below. This insulation protects the windings from contamination, shorting electrically, and also make the windings more mechanically rigid. Since it causes direct contact between atf and the cured varnish which adheres several motor parts together, both heat resistance and atf resistance are required for insulating varnish. Insulating varnish class f rapid airdry insulating. Varnishing the windings of an electric motor or generator functions to insulate the windings from contaminants, to make the windings rigid and tight, and to dissipate heat. Rembrandtin remisol core plate varnishes are specifically developed for the electrical. Class h insulation 180c motor protection voltage unbalance. Electrical electrical units, amps and electrical wiring, wire gauge and awg, electrical formulas and motors. Federal register friday, october 5, 2012 77 fr 61118 significant new use rules on certain chemical substances basis for action. Varnish meets performance requirements of astm d 11507 4. They then dip the hot motor in cold varnish class h polyester. Hyundai electric motors low voltage electric motor. Brocott uk unit 5, masham business park fearby road masham, ripon hg4 4es united kingdom.
Dry transformers, class b motors supplied with an epoxy varnish or as fused unvarnished to prevent fraying of the fibers. Aquameg 850 is a water based modified phenolic copolymer, which produces a tough resilient film with high bond strengths at all operating temperatures up to class h 180c. Also provided is an insulated electric wire having excellent processing resistance, heat resistance, and mechanical properties. Class a motor slot insulation, made up of paperboard, insulates the motor coil assemblies from ground. Suitable for use in thermal class b and f insulating systems.
How proper application of thermally conductive materials. The stator with class f insulation materials has an additional coating of varnish to extend thermal and mechanical life of the motor. A wide variety of electric motor varnish options are available to you, such as high voltage, high temperature, and low voltage. Relays, ignition coils, solenoids, small transformers. Temperature tolerance class b is the most common insulation class used on most 60 cycle us motors. Damisol 24 modified alkyd yes f 9162 25 450 5 h at 150c very flexible universal varnish. The products that we offer are manufactured using superior quality raw material. Field claims are increasing zenergy saving motor control decreases the motor s lifetime. Manufacturing cost low for mass production, when fully tooled.
Class a insulation consists of materials such as cotton. The hotspot is a point at the center of the motor s windings where the temperature is higher. Electric spray varnish provides a tough, impervious. Some epoxy resins are therefore suitable for class f duty and some silicone resins are rated class h. Varnish aerosol is an insulating spray for general coating, impregnating and insulating electrical and electronic work. How proper application of thermally conductive materials will. Pdf index trumetric iec motors crusher duty class h polyester varnish. Nor is motor efficiency reduced through multiple repairsrewinds. Whats the best method to soften varnish in electric motors. A definitepurpose, inverterduty motor andor harmonic suppression filter, load reactor.
Still a motor of choice for a new 400 hz aerospace applications. Magnet wire is insulated with a thin coating of a varnish that is specifically designed as an electrical insulation material. Contact the motor manufacturer for guidance on motor drive compatibility when peak voltages are expected to exceed 1,000 v or rise times will be less than 2 microseconds. Steel, carbon brush in motor, insulation varnish on motor windings notstated. It is particularly suitable for improving leakage characteristics of terminal assemblies. Alternator winding temperature rise in generator systems. We are a leading manufacturer and supplier of a wide range of insulating varnish. The life of a winding depends upon keeping it in its original condition as long as possible. The second choice is to get actual motor varnish and the procedure is somewhat the same, but then you put it into an oven and bake it as per. After a motor is rewound, the windings must be further insulated with resin or varnish. We carry a variety of their heavy duty industrial motors. Similarly, the motor with kl16 class of rotor would be capable of starting against the load torque of 160 % of its rated torque. Class y materials with impregnated varnish or insulation oil iii class e insulation.
As can be seen from the above table, hotspot over temperature allowance for a, b. Prepare and apply thermoguard fire varnishes to class 1 class 0 with glosssatinmatt finish according to the manufacturers instructions n. The electrical insulation system for wires used in generators, electric motors, transformers, and other wirewound electrical components is divided into different classes by temperature and temperature rise. The insulation system isolates one winding turn from another. Even when the material is diluted down to 20% nv content high bond strengths. Wo2012153636a1 polyimide resin varnish, insulated electric. The nema standard for electric motors and generators. Each insulation class has a margin allowed to compensate for the motor s hot spot. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. The hotspot is a point at the center of the motors windings where the temperature is higher. Insulation classes for electric motors learning electrical. Electrical insulation electrical varnish brocott uk.
In a new machine, the winding is snug in the slots, and the insulation is fresh and flexible and has been treated to be resistant to the deteriorating effects of moisture and other foreign matter. As can be seen from the above table, hotspot over temperature allowance for a, b, f and h are respectively 5 c, 10 c, 10 c and 15 c. These products can be used by spraying, dipping or brushing. Compared to varnish alone, the estimated achievable current required to reach the maximum temperature of 150c is 14% higher with epoxylite and 26% higher with cooltherm sc320 encapsulant. Similarly, the motor with kl16 class of rotor would be capable of starting against the load torque of 160 % of its rated torque though, kl10 class rotor could take maximum starting torque up to 180 % of the full load torque, and for. It is made up of organic material such as paper, wood and varnish.
Based on a joint study by association of electrical and mechanical trades aemt of the united kingdom and easa, this publication concludes that using best repairrewind practices maintains motor efficiency. Single component class 155 red pigmented antitracking. We used an insulating varnish on most of our stuff and you can buy the cheaper varnish and all you do is make your coil in the form you want, and then hand dip it into a pail and let it air dry. Lets take a look at some basic information about the ambient temperature of a motor and how this. Electric spray varnish sv100 antitracking film aerosol electric spray varnish provides a tough, impervious insulating seal ideal for components subjected to difficult environments and high humidity. Therefore, it is necessary to cool the motor down with immersing directly in automatic transmission fluid atf. A definitepurpose, inverterduty motor andor harmonic suppression filter, load reactor, or other voltage conditioning equipment may be required. Marlette test or motor test using these materials as a magnet wire, they are. Top features el601 red insulating varnish aerosol additional. Insulating varnish class h solvented impregnation insulating varnish insulating varnish class h is a solvented modified isophthalic varnis with long term tank stability and a thermal rating of 180 c. The polyimide resin varnish has as the main component thereof a polyimide precursor resin. These products are mainly used in repairing of fans, armatures and electric motors. The stator core is assembled from varnish insulated laminations produced at the same time as rotor laminations on an automated lamination precision punching and notching line, thus ensuring the best electrical and mechanical compatibility for rotorstator packs.
Motor frames have also been standardized with class e insulation only by iec recommendations, as in table 1. Lamination packs with the endplates are assembled onto a mandrel and consolidated. The coating systems of insulation class c6 meet the highest requirements. Performance materials insulating varnishes and impregnating. Example a motor operating at 180 o c will have an estimated life of. You make not have to soften the varnish at all except maybe warm it up with a hair dryer. The advantage of the second method is that there is an inherent 25 o c safety margin useful if you are in a region with high ambient temperatures or need to date the motor for some. The insulation system is based on mica tape and employs a split resin impregnation. Provided is a polyimide resin varnish capable of forming an insulating layer having high interlayer adhesion, high adhesion to a conductor, and excellent processing resistance.
Each insulation class has a margin allowed to compensate for the motors hot spot. Selection of induction motors for industrial applications. Inverter output waveform 400volt class have you experienced these challenges. A real motor shop will know how to break into the existing sleeving and the lapped stator windings to determine start from finish in each case and reconnect them to make a 230 volt three phase motor from a 460 volt. Prepare and apply thermoguard fire varnishes to class 1class 0 with glosssatinmatt finish according to the manufacturers instructions n. Though, kl10 class rotor could take maximum starting torque up to 180 % of the full load torque, and for kl16 class, it could go up to 200 %, but for very minimum time exerting more stress to the rotor. These problems are probably caused by inverter surges. Insulating varnish class f is a solvented isophthalic alkyd varnish specifically formulated for durable chemical resistant finishing with excellent electrical properties. Aemt association of electrical and mechanical trades. Protects surface against oils, moisture, acid and alkalis. Insulating varnishes and impregnating resins for electrical. Alternatively the motor could be specified for an insulation class, but be design to run at a low class for example insulation class f, temperature rise b. Class h 180c ul file number e220579 ultimeg 2000380 alkyd phenolic impregnating varnish class h general description ultimeg 2000380 is a high flash, alkyd phenolic which produces tough resilient insulating films with excellent electrical and bond strength characteristics at all operating temperatures up to class h 180c.
Insulating varnishes and impregnating resins for electrical insulation systems overview varnish is a liquid insulator that coats the winding wires and glues the wires together when cured. The different classes are defined by nema, underwriters laboratories ul, and iec. General motor knowledge part 24 insulation class b2 by lynn r. If properly selected, this product provides a number of benefits by improving the. Has excellent penetration and combines flexibility with high bond strength capabilities. Red insulating varnish 1801 morgan street rockford, il 61102 phone. Temperature classes of materials used for various insulators. Insulation class a, previously in use, has been discontinued in view of its low working temperature. The hyundai electric motors we distribute include premium efficiency, ieee841, explosion. Dip and bake epoxy varnishing, trickle varnishing, vacuum pressure impregnation, and.
Nov 10, 2015 cleaning and varnishing of machine windings. The electrical insulation system is sometimes referred to as insulation class or thermal classification. Some organic materials have been shown to be capable of continuous operation at higher temperatures. We have many members who supply the trade with electrical insulation tapes, varnishes, and resins view a list of members who supply electrical insulations for the electrical industry. Issued december 1, 1985 temperature classes of electrical insulators shimizu ohta 1. Red insulating varnish 4228 dielectric strength dry. The pmn states that the use of the substance will be as electrical insulating varnish for motors, generators and transformers.
Contact the motor manufacturer for guidance on motordrive compatibility when peak voltages are expected to exceed 1,000 v or rise times will be less than 2 microseconds. Aemteasa rewind study and good practice guide illustrates that when performed properly, electric motor repairrewind does not degrade efficiency. Damisol 2101 silicone no c 9114 9158 25 100 8 h at 200c hightemperatureresistant class c silicone varnish. Temperature tolerance class f is the most common for international and 50 cycle motors. If properly selected, this product provides a number of benefits by improving the electrical insulation system eis thermal stability and. Hot spot c a 105 b f 155 h 220 class a insulation. Especially convenient for traction motors and fire. If such insulation is varnish impregnated, it is usually rated as class a, e, or b, depending on the type of varnish.
Finishing varnish for turbogenerators, traction motors, etc. The ambient temperature of a motor can affect both a motors performance and its life. Electrical varnishes resins insulation materials electric motor. Excellent adhesion, flexibility, and water resistance. Hyundai electric is a world class quality manufacturer wellknown in the industrial market. Class a motor slot insulation, made up of paperboard, insulates the. This decision was taken because class e insulation offers a higher working temperature and a longer working life. Mar 05, 2019 after a motor is rewound, the windings must be further insulated with resin or varnish.
Using inverter control zeven though new parts were used in the motor, it soon broke. In the late 1930s, the types of synthetic resins became diverse and their production. Withstands a temperature of up to 120c iv class b insulation. The stator core is assembled from varnish insulated laminations produced at the same time as rotor. Introduction in early times, the temperature classes of electric insulators were simply divided into natural organics, inorganics, and combinations thereof.
All windings varnished by dreisilker electric motors carry a class f or h insulation rating, resulting in optimal efficiency. It provides electrical separation between the energized windings and the outside housing of the motor, the endbell. Field claims are increasing zenergy saving motor control decreases the motors lifetime. The aemt is a trades association for the electrical and mechanical industries. Temperature rise class a class b class f class h temp. This type of material is used as the solid insulation in oilfilled transformers.359 916 93 1542 529 439 1569 1353 1311 152 184 190 1209 1150 1648 834 1055 1303 218 325 142 14 7 1125 1310 1476 241 764 999 787 801 1212 1220 61 332