Why are insulation materials in motors becoming more and more important?

Voltage Regulator Compatible With GMC Terrain L4 2.4L 10-17 599386

Voltage Regulator Compatible With Kia Rio L4 1.6L 06-09 2607089

Water Pump Impeller Fit Nissan 4-stroke outboard motors NSF9.9, NSF15, NSF18, NSF20

Voltage Regulator Compatible With BMW - Europe 3 Touring (E46) Eng.M57 D30 (306D2) 330 xd 150kw 02-05 593793

Drive Clutch for Polaris SKS 500/700, XCR SP 440, Indy SP 2000-2002 – OEM 1322565

Water Pump Impeller 334-65021-0 M 18-8921 47-803748 Water Pump Impeller 334-65021-0 M 18-8921 47-803748 for Tohatsu Nissan Mercury Mercru...全文

Primary Drive Clutch for Polaris Turbo/FST/IQ LXT/LX 600 2004-2013 1322565

Voltage Regulator Compatible With Renault - Europe Megane II 02-10 593666

Pump Impeller 334-65021-0 for Tohatsu Outboard 9.9HP 15HP 18HP M9.9 M15 M18

Voltage Regulator Compatible With Nissan - Europe Note 06-12 2606174 593915

Voltage Regulator Compatible With Chevrolet - Europe KALOS Eng.B12S1 1.2 53kw 05-08 93740810

Primary Clutch 1322565 for Polaris Pro X 600 2001-2004

Primary Clutch 1322565 for Polaris XC SP 500/600/700, XC 500/600, Indy 700 2000-2007

Primary Drive Clutch 1322565 for Polaris RMK 500/600/700/800 2000-2008 Snowmobiles

Voltage Regulator Compatible With Ford - Europe FUSION (JU_) Eng.F6JA 593675

Alternator Voltage Regulator For 14V 233633 333347

Primary Clutch for Polaris 800 Pro R 2012-2014 Replacement for 1323088

Drive Clutch for Polaris Assault 600/800 2012-2016 Replace Part 1323088

Voltage Regulator Compatible With Hyundai XG350 V6 3.5L 02-03 20071017