Temperature tolerance class b is the most common insulation class used on most 60 cycle us motors. Inverter output waveform 400volt class have you experienced these challenges. This type of material is used as the solid insulation in oilfilled transformers. This decision was taken because class e insulation offers a higher working temperature and a longer working life. Hyundai electric motors low voltage electric motor. 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. The nema standard for electric motors and generators. 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 motor s windings where the temperature is higher. Issued december 1, 1985 temperature classes of electrical insulators shimizu ohta 1. Hot spot c a 105 b f 155 h 220 class a insulation. Magnet wire is insulated with a thin coating of a varnish that is specifically designed as an electrical insulation material.
It is particularly suitable for improving leakage characteristics of terminal assemblies. 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. Temperature classes of materials used for various insulators. Temperature rise class a class b class f class h temp. Lamination packs with the endplates are assembled onto a mandrel and consolidated. Excellent adhesion, flexibility, and water resistance. Has excellent penetration and combines flexibility with high bond strength capabilities. These problems are probably caused by inverter surges. The stator with class f insulation materials has an additional coating of varnish to extend thermal and mechanical life of the motor. Prepare and apply thermoguard fire varnishes to class 1 class 0 with glosssatinmatt finish according to the manufacturers instructions n. Red insulating varnish 4228 dielectric strength dry. 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. Aemt association of electrical and mechanical trades. General motor knowledge part 24 insulation class b2 by lynn r.
Insulating varnishes and impregnating resins for electrical. You make not have to soften the varnish at all except maybe warm it up with a hair dryer. 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. Nov 10, 2015 cleaning and varnishing of machine windings. Selection of induction motors for industrial applications. It is made up of organic material such as paper, wood and varnish. Electrical electrical units, amps and electrical wiring, wire gauge and awg, electrical formulas and 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. It provides electrical separation between the energized windings and the outside housing of the motor, the endbell.
The polyimide resin varnish has as the main component thereof a polyimide precursor resin. 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. The pmn states that the use of the substance will be as electrical insulating varnish for motors, generators and transformers. As can be seen from the above table, hotspot over temperature allowance for a, b. Pdf index trumetric iec motors crusher duty class h polyester varnish. These products are mainly used in repairing of fans, armatures and electric motors.
Electrical varnishes resins insulation materials electric motor. Therefore, it is necessary to cool the motor down with immersing directly in automatic transmission fluid atf. The ambient temperature of a motor can affect both a motors performance and its life. How proper application of thermally conductive materials.
Insulation classes for electric motors learning electrical. A wide variety of electric motor varnish options are available to you, such as high voltage, high temperature, and low voltage. 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. 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. Prepare and apply thermoguard fire varnishes to class 1class 0 with glosssatinmatt finish according to the manufacturers instructions n. Electrical insulation electrical varnish brocott uk. We are a leading manufacturer and supplier of a wide range of insulating varnish. Aemteasa rewind study and good practice guide illustrates that when performed properly, electric motor repairrewind does not degrade efficiency.
Class a motor slot insulation, made up of paperboard, insulates the. Also provided is an insulated electric wire having excellent processing resistance, heat resistance, and mechanical properties. Especially convenient for traction motors and fire. Dry transformers, class b motors supplied with an epoxy varnish or as fused unvarnished to prevent fraying of the fibers. Single component class 155 red pigmented antitracking. Similarly, the motor with kl16 class of rotor would be capable of starting against the load torque of 160 % of its rated torque. The products that we offer are manufactured using superior quality raw material. 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. Suitable for use in thermal class b and f insulating systems. There are four types of varnishing methods that we will describe below. Electric spray varnish provides a tough, impervious. Varnish aerosol is an insulating spray for general coating, impregnating and insulating electrical and electronic work. In the late 1930s, the types of synthetic resins became diverse and their production. 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 stator core is assembled from varnish insulated laminations produced at the same time as rotor. How proper application of thermally conductive materials will. Hyundai electric is a world class quality manufacturer wellknown in the industrial market. Federal register friday, october 5, 2012 77 fr 61118 significant new use rules on certain chemical substances basis for action. Example a motor operating at 180 o c will have an estimated life of. They then dip the hot motor in cold varnish class h polyester. The electrical insulation system is sometimes referred to as insulation class or thermal classification. Top features el601 red insulating varnish aerosol additional. Withstands a temperature of up to 120c iv class b insulation. Even when the material is diluted down to 20% nv content high bond strengths. Alternator winding temperature rise in generator systems. All windings varnished by dreisilker electric motors carry a class f or h insulation rating, resulting in optimal efficiency. Field claims are increasing zenergy saving motor control decreases the motors lifetime. Wo2012153636a1 polyimide resin varnish, insulated electric.
Brocott uk unit 5, masham business park fearby road masham, ripon hg4 4es united kingdom. If properly selected, this product provides a number of benefits by improving the. 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. 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 different classes are defined by nema, underwriters laboratories ul, and iec. 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.
Some organic materials have been shown to be capable of continuous operation at higher temperatures. 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. Introduction in early times, the temperature classes of electric insulators were simply divided into natural organics, inorganics, and combinations thereof. After a motor is rewound, the windings must be further insulated with resin or varnish. 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. Steel, carbon brush in motor, insulation varnish on motor windings notstated.
Red insulating varnish 1801 morgan street rockford, il 61102 phone. Performance materials insulating varnishes and impregnating. Motor frames have also been standardized with class e insulation only by iec recommendations, as in table 1. Each insulation class has a margin allowed to compensate for the motors hot spot. Rembrandtin remisol core plate varnishes are specifically developed for the electrical. Class a motor slot insulation, made up of paperboard, insulates the motor coil assemblies from ground. Manufacturing cost low for mass production, when fully tooled. 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. Varnish meets performance requirements of astm d 11507 4. We carry a variety of their heavy duty industrial motors. The insulation system isolates one winding turn from another. Damisol 2101 silicone no c 9114 9158 25 100 8 h at 200c hightemperatureresistant class c silicone varnish. Still a motor of choice for a new 400 hz aerospace applications.
These products can be used by spraying, dipping or brushing. 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. Class a insulation consists of materials such as cotton. 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. 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. Temperature tolerance class f is the most common for international and 50 cycle motors. A definitepurpose, inverterduty motor andor harmonic suppression filter, load reactor, or other voltage conditioning equipment may be required. The hyundai electric motors we distribute include premium efficiency, ieee841, explosion. 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. The coating systems of insulation class c6 meet the highest requirements. Relays, ignition coils, solenoids, small transformers. This insulation protects the windings from contamination, shorting electrically, and also make the windings more mechanically rigid.
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. Mar 05, 2019 after a motor is rewound, the windings must be further insulated with resin or varnish. The hotspot is a point at the center of the motors windings where the temperature is higher. 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.
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. Insulating varnish class f is a solvented isophthalic alkyd varnish specifically formulated for durable chemical resistant finishing with excellent electrical properties. A definitepurpose, inverterduty motor andor harmonic suppression filter, load reactor. Protects surface against oils, moisture, acid and alkalis. Class y materials with impregnated varnish or insulation oil iii class e insulation. Each insulation class has a margin allowed to compensate for the motor s hot spot. Whats the best method to soften varnish in electric motors. 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. Damisol 24 modified alkyd yes f 9162 25 450 5 h at 150c very flexible universal varnish. Some epoxy resins are therefore suitable for class f duty and some silicone resins are rated class h. The insulation system is based on mica tape and employs a split resin impregnation. Insulating varnish class f rapid airdry insulating. Dip and bake epoxy varnishing, trickle varnishing, vacuum pressure impregnation, and. The life of a winding depends upon keeping it in its original condition as long as possible.
Marlette test or motor test using these materials as a magnet wire, they are. If properly selected, this product provides a number of benefits by improving the electrical insulation system eis thermal stability and. 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. Nor is motor efficiency reduced through multiple repairsrewinds. If such insulation is varnish impregnated, it is usually rated as class a, e, or b, depending on the type of varnish. Class h insulation 180c motor protection voltage unbalance. 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. Using inverter control zeven though new parts were used in the motor, it soon broke. Lets take a look at some basic information about the ambient temperature of a motor and how this. Finishing varnish for turbogenerators, traction motors, etc. Field claims are increasing zenergy saving motor control decreases the motor s lifetime. Insulation class a, previously in use, has been discontinued in view of its low working temperature. The aemt is a trades association for the electrical and mechanical industries.
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