Invention Grant
- Patent Title: Method and apparatus for an emergency lowering kit
- Patent Title (中): 紧急降压套件的方法和装置
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Application No.: US14444717Application Date: 2014-07-28
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Publication No.: US09409752B2Publication Date: 2016-08-09
- Inventor: Charles Sutherland
- Applicant: Electronic Power Design, Inc.
- Applicant Address: US TX North Houston
- Assignee: Electronic Power Design, Inc.
- Current Assignee: Electronic Power Design, Inc.
- Current Assignee Address: US TX North Houston
- Agency: G. Michael Roebuck, PC
- Main IPC: H02P27/04
- IPC: H02P27/04 ; B66C13/18 ; B66C13/22 ; H02P3/12 ; G05B15/02 ; B66C13/14 ; B66C23/16 ; B66C23/88
Abstract:
A method and apparatus are disclosed for lowering a load on a direct current hoist motor during an electrical power interruption, the method including but not limited to determining in a crane processor that the electrical power interruption has occurred; and providing a brake assist current to shunt field on the direct current hoist motor to produce a counter torque in the hoist motor.
Public/Granted literature
- US20150130375A1 METHOD AND APPARATUS FOR AN EMERGENCY LOWERING KIT Public/Granted day:2015-05-14
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