OPERATION AND MAINTENANCE MANUAL
ID MOTORS
PAGE: 27
CODE: CTT52 EDITION: 03 RELEASE: APRIL 2019
Subject to technical changes without prior notice
3.7
Electrical specifications
Windings and insulation
3.7.1
ID motor coil windings are made up of copper wires and plates with two coats of polyamide varnish > 220°C and/or THEIC-
Polyesterimide with Amide-Imide > 200°C, rated with H-type insulation class.
They are impregnated using single-component epoxy resins that polymerise on the basis of temperature, also class H.
The coils are insulated from the magnetic circuit of the armature and the stator by means of NMN (Nomex-Mylar-Nomex)
sandwich-type paper. The outer parts of the sandwich (Nomex) are fibres, whereas the core (Mylar) is a plastic film of
polyethylene terephthalate. Special care is also taken with the insulation between each phase.
This insulation system ensures adequate dielectric resistance for motor operation during the most critical applications.
Connections
3.7.2
The connections between the windings and the terminal box are made using a flexible cable coated with FEP capable of
withstanding up to 200°C. The connections are welded using a FUSBAT650 rod. The welds of the contacts are also protected by
a double layer of fibreglass insulation pipe with class-H acrylic impregnation.
The armature coils are wave-soldered to the manifold.
Power-supply conditions
3.7.3
ID motors are designed to work with a power supply via AC/DC or DC/DC converters with full-bridge thyristors or high-frequency
choppers and they can withstand voltages of up to 700 VDC (500 VAC).
