Linear-Rotary Actuator Synchronous Asynchronous Motion Control
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Solution Overview
Problem
Existing linear-rotary actuators require additional conversion mechanisms and suffer from reliability issues due to the integration of linear motors and servo rotary motors, which complicates the provision of both linear and rotary motion outputs.
Innovation Solution
A linear-rotary actuator design utilizing two linear motors and a ball screw, where the screw and nut are driven synchronously or asynchronously to provide linear and rotary motion outputs respectively, eliminating the need for a servo rotary motor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a linear motor and a servo rotary motor are integrated to provide linear and rotary motion outputs, then both linear and rotary motions can be provided, but additional conversion mechanisms are required and the device complexity increases
Solution Approach 1:
The patent merges the functions of linear motor and rotary motor into a single integrated actuator unit. The linear motor includes both a linear motor body for linear motion and a rotary motor body coupled to the same moving platform, eliminating the need for separate conversion mechanisms while providing both linear and rotary motion outputs from one unified device.
Solution Approach 2:
The integrated linear-rotary actuator serves multiple functions simultaneously: it provides linear motion through the linear motor body, rotary motion through the rotary motor body, and both motions can be provided independently or in combination. This multi-functionality reduces the need for additional specialized components.
2Adaptability or versatility
If a servo rotary motor is mounted on the moving part of the linear motor, then rotary motion can be provided, but power cables and encoder cables must follow the movement which reduces reliability
Solution Approach 1:
The patent resolves the cable reliability issue by changing the spatial arrangement: instead of mounting the rotary motor on the moving part (one dimension), the rotary motor body is mounted on the stationary platform while its output is transmitted to the moving platform through a different dimensional path. This separation ensures cables remain stationary while motion is transmitted mechanically through the integrated structure.
3Reliability
If two linear motors and a ball screw are used to provide linear and rotary motion outputs, then no additional servo rotary motor is required, but the integration complexity may increase
Solution Approach 1:
The patent combines two linear motors and a ball screw into a single integrated actuator unit where the components work together seamlessly. The first linear motor drives the ball screw for linear motion, while the second linear motor provides rotary motion, all within one unified structure that eliminates the need for separate servo rotary motors.
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 design enhances the reliability and simplifies the integration of linear and rotary motion outputs, reducing the complexity and increasing the efficiency of motion conversion without requiring an additional servo rotary motor.
Implementation Method 1
The first linear motor is disposed on the base and includes a fixed first coil assembly and a movable first magnet backplane
Implementation Method 2
The second linear motor is disposed on the base and includes a fixed second coil assembly and a movable second magnet backplane
Implementation Method 3
The ball screw includes a screw and a nut screwed together. Moreover, the screw is connected to the first magnet backplane and coupled to the first linear rail, and the nut is connected to the second magnet backplane and coupled to the first linear rail
Data Source
AI summary
A linear-rotary actuator includes a base, a first linear motor, a second linear motor, a linear rail, and a ball screw. The first and second linear motors are disposed on the base and respectively have a coil assembly and a magnet backplane. The linear rail is located on the base. The ball screw includes a screw and a nut, wherein the screw is connected to the first linear motor, and the nut is connected to the second linear motor. When the screw and the nut are driven by the first and second linear motors to move along the linear rail in a synchronized manner, the linear-rotary actuator provides linear motion output. When the nut is driven by the second linear motor to move along the linear rail in an asynchronous manner with respect to the screw, the linear-rotary actuator provides rotary motion output.