This paper proposes an "Active Common-noise Canceler (ACC)" that is capable of eliiminating the commonmode voltage produced by a PWM inverter. An emitter follower using complementary transistors and a commonmode transformer are incorporated into the ACC, the design method of which is also presented in detail. A prototype ACC designed and constructed in t h i s paper verifies the viability and effectiveness in a 3.7 k W induction motor drive using an IGBT inverter. Some experimental results show that the ACC makes significant contributions to reducing a ground current and a conducted ECMI. In addition, the ACC can prevent an electric shock on a non-grounded motor frame and can suppress a motor shaft voltage.

The high affinity of α-blockers for α(1)-adrenoreceptors is important in the analysis of the mechanism of IFIS. However, IFIS should not be attributed to long-term binding with receptors alone; the drug-melanin interaction causing dilator muscle atrophy is probably the other important factor in the mechanism of IFIS.