Coupled Capacitive Magnetic Servo Motor Actuation
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Solution Overview
Problem
Existing linear actuators, particularly in manufacturing and automotive industries, face limitations such as contamination risks, high maintenance costs, and inaccuracies in positioning due to the use of fluid actuators, which require pressurized fluid supplies and are prone to leaks.
Innovation Solution
The development of coupled capacitive and magnetic servo motor systems that utilize a hollow shaft motor with a magnetically or capacitively coupled rotor, enabling precise and controlled linear or rotational movement, suitable for applications like welding guns and clamping fixtures, by converting rotational motion into linear motion through a threaded screw and nut mechanism, with capacitive coupling providing accurate torque transfer without contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fluid actuators (pneumatic or hydraulic) are used for actuation, then actuation function is achieved, but contamination risk increases due to leaks and seal failures
Solution Approach 1:
The patent replaces fluid actuation systems with a direct-drive electromagnetic motor system. The motor includes a rotor with permanent magnets and a stator with electromagnets that directly drive the actuator rod through magnetic field interaction, eliminating fluid seals and connections that are prone to leakage and contamination.
Solution Approach 2:
The invention extracts and removes the fluid supply system, seals, and connections from the actuator design. By using a sealed electromagnetic motor with internal magnetic coupling, the system eliminates external fluid lines and seal interfaces that are the primary sources of contamination.
2Reliability
If fluid actuators are used, then actuation is achieved, but maintenance costs and complexity increase due to fluid supply systems
Solution Approach 1:
The patent extracts and eliminates the external fluid supply system, reservoirs, valves, and associated piping. The electromagnetic motor is a self-contained unit that converts electrical energy directly to mechanical motion without requiring external fluid infrastructure.
Solution Approach 2:
The invention substitutes the complex fluid mechanical system with a simpler electromagnetic system. The motor uses electrical currents in the stator to create magnetic fields that interact with permanent magnets in the rotor, providing actuation through electromagnetic forces rather than fluid pressure.
3Manufacturing precision
If traditional motor coupling arrangements are used, then rotational motion is transferred, but positioning accuracy and torque transfer efficiency decrease
Solution Approach 1:
The patent removes traditional mechanical coupling components such as gears, belts, chains, or shafts that connect the motor to the actuator rod. Instead, the motor's rotor is directly coupled to the actuator rod through magnetic fields, eliminating intermediate coupling mechanisms that reduce precision and add complexity.
Solution Approach 2:
The invention merges the motor and actuator into a single integrated unit. The rotor of the electromagnetic motor is directly attached to or forms part of the actuator rod assembly, creating a unified structure where rotational motion is immediately and directly converted to linear actuator motion without separate coupling components.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution provides a reliable, low-maintenance, and highly accurate actuation system that reduces contamination risks and operational costs, offering precise control over linear motion with improved positioning accuracy and reduced torque requirements.
Implementation Method 1
a capacitive motor having capacitive motor components configured to transfer torque to the rotor shaft through capacitive coupling
Implementation Method 2
a magnetic motor having magnetic motor components configured to transfer torque to the rotor shaft through magnetic coupling
Implementation Method 3
converting rotational motion into linear motion through a threaded screw and nut mechanism
Data Source
AI summary
A motor system comprises a rotor shaft, and a magnetic drive motor and a capacitive drive motor. An engagement system is configured for selectively engaging one or both of the magnetic drive motor and the capacitive drive motor with the rotor shaft, in order to rotate the rotor shaft at a desired rotational speed and generate a desired output torque. An actuator may be coupled to the rotor shaft in order to convert the rotational speed and/or output torque (or a rotational position of the rotor shaft) for operation on a load, for example to position the load rotationally or linearly with respect to the rotor axis, or to exert a force or torque on the load.