The polyimide resin varnish has as the main component thereof a polyimide precursor resin. Similarly, the motor with kl16 class of rotor would be capable of starting against the load torque of 160 % of its rated torque. 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. The hyundai electric motors we distribute include premium efficiency, ieee841, explosion.
Electrical varnishes resins insulation materials electric motor. Damisol 24 modified alkyd yes f 9162 25 450 5 h at 150c very flexible universal varnish. 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. The ambient temperature of a motor can affect both a motors performance and its life. Using inverter control zeven though new parts were used in the motor, it soon broke. The hotspot is a point at the center of the motors windings where the temperature is higher. Dry transformers, class b motors supplied with an epoxy varnish or as fused unvarnished to prevent fraying of the fibers. Insulating varnish class f is a solvented isophthalic alkyd varnish specifically formulated for durable chemical resistant finishing with excellent electrical properties. Inverter output waveform 400volt class have you experienced these challenges. Electric spray varnish provides a tough, impervious. These products are mainly used in repairing of fans, armatures and electric motors. If such insulation is varnish impregnated, it is usually rated as class a, e, or b, depending on the type of varnish.
Insulating varnishes and impregnating resins for electrical. How proper application of thermally conductive materials will. Still a motor of choice for a new 400 hz aerospace applications. The pmn states that the use of the substance will be as electrical insulating varnish for motors, generators and transformers. Finishing varnish for turbogenerators, traction motors, etc. Each insulation class has a margin allowed to compensate for the motors hot spot. How proper application of thermally conductive materials. Mar 05, 2019 after a motor is rewound, the windings must be further insulated with resin or varnish.
All windings varnished by dreisilker electric motors carry a class f or h insulation rating, resulting in optimal efficiency. Alternator winding temperature rise in generator systems. 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. Temperature classes of materials used for various insulators. Dip and bake epoxy varnishing, trickle varnishing, vacuum pressure impregnation, and. A definitepurpose, inverterduty motor andor harmonic suppression filter, load reactor. Field claims are increasing zenergy saving motor control decreases the motors lifetime. The insulation system is based on mica tape and employs a split resin impregnation.
We carry a variety of their heavy duty industrial motors. 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. Motor frames have also been standardized with class e insulation only by iec recommendations, as in table 1. These problems are probably caused by inverter surges. Protects surface against oils, moisture, acid and alkalis. Class a insulation consists of materials such as cotton. Introduction in early times, the temperature classes of electric insulators were simply divided into natural organics, inorganics, and combinations thereof. Temperature tolerance class f is the most common for international and 50 cycle motors. Red insulating varnish 4228 dielectric strength dry. 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. A wide variety of electric motor varnish options are available to you, such as high voltage, high temperature, and low voltage. Each insulation class has a margin allowed to compensate for the motor s hot spot. 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. 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.
Withstands a temperature of up to 120c iv class b insulation. Electrical insulation electrical varnish brocott uk. The motor with kl10 class of rotor, when started directonline, would accelerate safely to its rated speed against the load torque of 100 % of its rated torque. 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. 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. Nov 10, 2015 cleaning and varnishing of machine windings. Especially convenient for traction motors and fire. Lets take a look at some basic information about the ambient temperature of a motor and how this. Brocott uk unit 5, masham business park fearby road masham, ripon hg4 4es united kingdom. Excellent adhesion, flexibility, and water resistance.
Insulation classes for electric motors learning electrical. 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. In the late 1930s, the types of synthetic resins became diverse and their production. Whats the best method to soften varnish in electric motors. 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.
Class a motor slot insulation, made up of paperboard, insulates the. They then dip the hot motor in cold varnish class h polyester. Aemt association of electrical and mechanical trades. Manufacturing cost low for mass production, when fully tooled. The aemt is a trades association for the electrical and mechanical industries. This decision was taken because class e insulation offers a higher working temperature and a longer working life. Top features el601 red insulating varnish aerosol additional.
The stator core is assembled from varnish insulated laminations produced at the same time as rotor. 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. 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. The different classes are defined by nema, underwriters laboratories ul, and iec. After a motor is rewound, the windings must be further insulated with resin or varnish. 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. Aemteasa rewind study and good practice guide illustrates that when performed properly, electric motor repairrewind does not degrade efficiency. Nor is motor efficiency reduced through multiple repairsrewinds. 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.
Varnish meets performance requirements of astm d 11507 4. If properly selected, this product provides a number of benefits by improving the. 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 nema standard for electric motors and generators. Federal register friday, october 5, 2012 77 fr 61118 significant new use rules on certain chemical substances basis for action. This type of material is used as the solid insulation in oilfilled transformers. A definitepurpose, inverterduty motor andor harmonic suppression filter, load reactor, or other voltage conditioning equipment may be required. The life of a winding depends upon keeping it in its original condition as long as possible. 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.
Damisol 2101 silicone no c 9114 9158 25 100 8 h at 200c hightemperatureresistant class c silicone varnish. Performance materials insulating varnishes and impregnating. If properly selected, this product provides a number of benefits by improving the electrical insulation system eis thermal stability and. We are a leading manufacturer and supplier of a wide range of insulating varnish. As can be seen from the above table, hotspot over temperature allowance for a, b. 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. Electrical electrical units, amps and electrical wiring, wire gauge and awg, electrical formulas and motors. Class h insulation 180c motor protection voltage unbalance.
Hot spot c a 105 b f 155 h 220 class a insulation. Wo2012153636a1 polyimide resin varnish, insulated electric. The electrical insulation system is sometimes referred to as insulation class or thermal classification. The products that we offer are manufactured using superior quality raw material. Temperature rise class a class b class f class h temp.
General motor knowledge part 24 insulation class b2 by lynn r. 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. Selection of induction motors for industrial applications. Example a motor operating at 180 o c will have an estimated life of. Hyundai electric is a world class quality manufacturer wellknown in the industrial market. Has excellent penetration and combines flexibility with high bond strength capabilities. Pdf index trumetric iec motors crusher duty class h polyester varnish. Field claims are increasing zenergy saving motor control decreases the motor s lifetime. These products can be used by spraying, dipping or brushing. It is made up of organic material such as paper, wood and varnish.
Some organic materials have been shown to be capable of continuous operation at higher temperatures. The insulation system isolates one winding turn from another. Lamination packs with the endplates are assembled onto a mandrel and consolidated. Issued december 1, 1985 temperature classes of electrical insulators shimizu ohta 1. 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. Hyundai electric motors low voltage electric motor. 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. Relays, ignition coils, solenoids, small transformers.
Red insulating varnish 1801 morgan street rockford, il 61102 phone. Steel, carbon brush in motor, insulation varnish on motor windings notstated. Single component class 155 red pigmented antitracking. The hotspot is a point at the center of the motor s windings where the temperature is higher. Class y materials with impregnated varnish or insulation oil iii class e insulation. Rembrandtin remisol core plate varnishes are specifically developed for the electrical. Magnet wire is insulated with a thin coating of a varnish that is specifically designed as an electrical insulation material. Marlette test or motor test using these materials as a magnet wire, they are. You make not have to soften the varnish at all except maybe warm it up with a hair dryer. Also provided is an insulated electric wire having excellent processing resistance, heat resistance, and mechanical properties. This insulation protects the windings from contamination, shorting electrically, and also make the windings more mechanically rigid.
Insulating varnish class f rapid airdry insulating. Some epoxy resins are therefore suitable for class f duty and some silicone resins are rated class h. Prepare and apply thermoguard fire varnishes to class 1 class 0 with glosssatinmatt finish according to the manufacturers instructions n. 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. Prepare and apply thermoguard fire varnishes to class 1class 0 with glosssatinmatt finish according to the manufacturers instructions n. 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 provides electrical separation between the energized windings and the outside housing of the motor, the endbell. Insulation class a, previously in use, has been discontinued in view of its low working temperature. 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.
It is particularly suitable for improving leakage characteristics of terminal assemblies. Therefore, it is necessary to cool the motor down with immersing directly in automatic transmission fluid atf. The stator with class f insulation materials has an additional coating of varnish to extend thermal and mechanical life of the motor. There are four types of varnishing methods that we will describe below. Even when the material is diluted down to 20% nv content high bond strengths. Varnish aerosol is an insulating spray for general coating, impregnating and insulating electrical and electronic work. Temperature tolerance class b is the most common insulation class used on most 60 cycle us motors. 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. 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.
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