Invention Grant
- Patent Title: Techniques for redundancy and fault tolerance in high demand machine safety applications
- Patent Title (中): 高需求机器安全应用中的冗余和容错技术
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Application No.: US11832762Application Date: 2007-08-02
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Publication No.: US07679299B2Publication Date: 2010-03-16
- Inventor: Craig Winterhalter , Robert Harris Schmidt , Arun K. Guru
- Applicant: Craig Winterhalter , Robert Harris Schmidt , Arun K. Guru
- Applicant Address: US OH Mayfield Heights
- Assignee: Rockwell Automation Technologies, Inc.
- Current Assignee: Rockwell Automation Technologies, Inc.
- Current Assignee Address: US OH Mayfield Heights
- Agency: Turocy & Watson LLP
- Agent R. Scott Speroff
- Main IPC: H02K41/00
- IPC: H02K41/00

Abstract:
Self-sensing feedback functionality for electromechanical actuators/motors is provided for use in operation and/or as a redundant safety mechanism to attain safety certification without adding extra bulk or wiring to the motor. An actuator can be manufactured having one or more saliencies that cause a spatial variance of inductance. A high frequency signal can be injected into the actuator and sampled to determine a current, voltage, or other electrical parameter. The parameter can be evaluated against the known saliencies of the actuator to determine a position of the actuator and/or an associated rotor. Additionally, the position can be evaluated as a function of time to determine a velocity. This can provide an alternative method for operating the electromechanical actuator according to the position/velocity provided. Additionally, this can provide a redundant feedback channel for safety certification without requiring additional actuator parts.
Public/Granted literature
- US20090033272A1 TECHNIQUES FOR REDUNDANCY AND FAULT TOLERANCE IN HIGH DEMAND MACHINE SAFETY APPLICATIONS Public/Granted day:2009-02-05
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