Voltage and Pulse Endurance Test of New Generation wire CORONA - RTM developed

Inverters are commonly used in various motor applications. This greatly increases the pulse endurance stress of the wire due to switching transience. A new type of wire with two layers & three layers of Corona resistant material has been developed by BCwire® to overcome the aforementioned problem. This paper will give a brief introduction of the wire, detailed test procedure, and preliminary results compared with traditional insulation wires. The aim of this paper is to give users a better understanding of this new type of wire and supply sufficient information for wire selection. I. NOMENCLATURE Wire of different insulation materials will be introduced here: The wire with name PE(I)/PAIis with two insulation layers with Polyamideimide in the outer layer and a modified Polyester in the inner layer coated on the conductor. NEMA MW35. The new wire developed by BCwire® with name MPE/CR/PAI is with three insulation layers. The outer layer is Polyamideimide, the middle is a Corona Resistant Enamel, and the inner layer is a Modified Polyester all coated on the inductor. Fig 1: Configuration of the BCwire with 3 insulation layers MPE/CR/PAI This work was supported in part by The Hong Kong Polytechnic University and P. Leo & Co., (B.C.) Ltd. BCWIRE® Mr. Wai Fung Choi is with Power Electronics Research Laboratory, the Department of Electrical Engineering,, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong([email protected]) Mr. Peter Wong is with P. Leo & Co. Ltd. , P.O. Box 94250, ‘Richmond,B.C.V6Y2A6, Canada (Email: [email protected]) Prof. Eric Cheng is with the Department of Electrical Engineering,, Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong([email protected]) Fig 2: Configuration of the BCwire with 2 insulation layer MPE/PAI-CR Another new wire also developed by BCwire® named MPE/PAI-CR is with two insulation layers. Polyamideimide in the outer layer (Corona Resistant Enamel) and in the inner layer a modified Polyester coating on the conductor. With the new application of nanotechnology in MPE/PAI-CR, the outer layer with corona resistant enamel has a partied size distribution D[v,0.10] (microns)=0.09, the wire flex properties (20% snap) 3x compare the old design 20% 5x has been much improved. The aforementioned two wires by BCwire® feature Nanotechnology in the Basecoat or Topcoat and can be substituted for either MW35 or MW37 & most MEMA standards. I