The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 21, 2010
Filed:
Mar. 30, 2009
William T. Townsendl, Weston, MA (US);
Adam Crowell, Beverly, MA (US);
Gill Pratt, Lexington, MA (US);
Traveler Hauptman, Watertown, MA (US);
William T. Townsendl, Weston, MA (US);
Adam Crowell, Beverly, MA (US);
Gill Pratt, Lexington, MA (US);
Traveler Hauptman, Watertown, MA (US);
Barrett Technology, Inc., Cambridge, MA (US);
Abstract
Featured is a controller for a motor that is ultra-compact, with a power density of at least about 20 watts per cubic cm (W/cm). The controller utilizes a common ground for power circuitry, which energizes the windings of the motor, and the signal circuitry, which controls this energization responsive to signals from one or more sensors. Also, the ground is held at a stable potential without galvanic isolation. The circuits, their components and connectors are sized and located to minimize their inductance and heat is dissipated by conduction to the controller's exterior such as by a thermally conductive and electrically insulating material (e.g., potable epoxy). The controller uses a single current sensor for plural windings and preferably a single heat sensor within the controller. The body of the controller can also function as the sole plug connector.