Toshiba International Corporation

Michael C Daskalos

John David Kleinecke

Enrique Martinez

Walter Campos

Osamu Tanaka

John C Kleinecke

A cabinet including a door, a fastener, and a latch bracket is provided. The fastener is extending at least partially through an aperture in the door. The latch bracket is located on an internal surface of a door frame to secure the door to the door frame. A retainer washer is disposed around the fastener and disposed between the latch bracket and the door in order to retain the fastener when in a disengaged position.

Systems and methods of one or more latch brackets

In accordance with presently disclosed embodiments, a system and method for controlling the temperature of medium-voltage power electronics assemblies (i.e., medium-voltage drives) is provided. The disclosed system generally includes a medium-voltage drive having one or more cabinets with power electronics devices disposed therein, one or more fans for circulating air through the cabinet to cool the devices, and one or more space heaters disposed in the cabinet. The drive also features temperature sensors used to measure various temperatures of the drive, a controller communicatively coupled to the sensors, and one or more variable frequency drives (VFD) for the fans. The controller may receive measurements regarding the ambient and power device temperatures and apply controls to vary the space heater power and fan speed in response to environmental changes.

Environmental control for medium-voltage drive

An 18n-pulse rectifier for AC drive systems having a separate DC bus for each output phase is described, where n=any positive integer. The rectifier uses three separate phase rectifiers, one for each output phase of a transformer, each comprised of n six-pulse diode bridges connected in series or parallel. Each phase rectifier may be supplied with n unique sets of phase inputs from a transformer secondary winding. In some configurations, the n sets of inputs provided to each rectifier are separated by 60/n degrees of phase (when n is greater than 1), while the corresponding inputs to neighboring rectifiers are separated by 20/n degrees of phase. In a 36-pulse example, the phase offsets for the inputs provided to the rectifiers may be &#x2212;25&#xb0; and +5&#xb0; from the transformer primary winding (for the first rectifier), &#x2212;15&#xb0; and +15&#xb0; from the primary winding (for the second rectifier) and &#x2212;5&#xb0; and +25&#xb0; from the primary winding (for the third rectifier). Each set of inputs may include three lines of in-phase current, and may be coupled to one of the six-pulse diode bridges.

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Magnolia, TX, United States of America

Michael C Daskalos