Background:
With current means of actuation, very few options exist that provide multiple degrees of freedom (DOF) and move independently without the addition of multiple motors. For instance, conventional means of safely actuating robotic devices involve the use of specially modified servo motors at each joint to control motion. In most applications today, there is a growing requirement for movement in multiple DOF, but that would be too expensive to implement with several motors. A 2007 market report by Frost and Sullivan states the world-wide actuator market to be about $4.5 billion, growing at a rate of 8% annually.
Description of the Invention:
Researchers at Western University have developed a novel technology using magneto-rheological (MR) fluids in an actuation mechanism that connects a typical motor to a load. Magneto-rheological (MR) fluids are smart materials that instantaneously and reversibly change viscosity in the presence of a magnetic field, allowing them to transfer force/torque. By controlling the strength of the magnetic field, it is possible to accurately control the torque in the actuation system which acts as a switch for each DOF. This enables flexibility in incorporating as many DOF the user wishes, without compromising the single input motor. Ultimately, the user will have complete control of which direction the actuation occurs.
Western’s innovative approach eliminates the need for multiple motors, gears and sensors. This provides a cost-competitive alternative for any multi-DOF actuation system.
The following video describes the MR actuation mechanism further:
Potential Advantages:
• Uses only one motor to move in multiple DOF, reduces cost to produce actuators
• Flexible technology applicable to various complex or simple actuation systems
• Incorporates inexpensive force/torque sensors for precise force/torque measurements
Potential Applications:
• Magneto-Rheological Fluids
• Economic Torque Sensors
• Actuation Systems
• Automation
Patent Status:
National phase patents allowed in US and Canada.
