Large induction motors are the primary choice for industrial manufacturing. CMT rewinds large AC motors to original manufacturer specifications. From core loss testing, coil installation, rewinding, testing and VPI varnishing, CMT can handle any size induction motor. All mechanical, electrical and component aspects are inspected and verified.
Two varnish processes available for motors: Dip and Bake and Vacuum Pressure Impregnation
There are two available varnish processes for electric motors: Dip and Bake immerses a motor into a tank of varnish. Vacuum Pressure Impregnation (or VPI) is a process that places the motor into a chamber with a controlled atmosphere. The dip and bake method develops a hydro static pressure that dissipates many air voids and […]
Vacuum pressure impregnation enhances the life of electrical motor windings
Vacuum pressure impregnation, known as VPI, is a varnish process for electric motor insulation. The several-hour process begins with a prebake cycle to remove any moisture, the component is placed into the varnish chamber, a vacuum is pulled to remove air, varnish is introduced and the varnish chamber is pressurized. Computerized capacitance monitoring insures a […]
Motor rewinds with dip and bake are cost effective measures
The rewind of an industrial electric motor can often be an effective cost measure for a customer. When excessive heat causes damage or failure of a motor’s insulation system, there is no need to run out and buy a new motor. Motor rewinding gets the motor back in good working order without the high cost […]
What is VPI? What is dip and bake?
These two terms are often used in the motor repair industry to describe a type of insulation finishing process used on rewound electric motors. When a motor is rewound, it must be processed in some type of varnish in order to hold the windings together. This varnish, also known as resin, helps to bond the […]