Abstract: In one aspect of the present invention, a motor control system includes a rectifier module enclosed in a first flame-proof enclosure, and having a first input and one or more rectifier circuits configured to convert a first AC voltage at the first input to a DC voltage to be output to a DC bus, and one or more variable-frequency drive (VFD) modules, each VFD module being enclosed in a respective second flame-proof enclosure and having a second input coupled to the DC bus, where each VFD module includes one or more inverter circuits configured to convert the DC voltage on the DC bus to a second AC voltage to be output to one or more motors.
Type:
Application
Filed:
June 17, 2011
Publication date:
December 20, 2012
Applicant:
SANY HEAVY EQUIPMENT, USA R&D INSTITUTE
Inventors:
David G. Thomas, Hugh Boggs, JR., Michael Twigger
Abstract: In one aspect of the present invention, an accessible indirect entry cable gland has a collar having a first end, an opposite, second end, and a first bore adapted for receiving a cable having one or more electrical conductors from the first end thereof and passing the cable through the second end thereof into a flameproof enclosure, a flame-resistant bushing filling a first part of the first bore of the collar at the second end thereof and adapted for passing the cable therethrough and holding the cable in place, and a cap having a first end and an opposite, second end, and a second bore adapted for receiving the cable from the first end thereof and passing the cable having one or more electrical conductors through the second end thereof into the collar.
Type:
Application
Filed:
May 20, 2011
Publication date:
November 22, 2012
Applicant:
SANY HEAVY EQUIPMENT, USA R&D INSTITUTE