Single Motor Torque and Axial Force Control
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Solution Overview
Problem
Conventional rotating motors cannot perform both rotating and translating movements efficiently, requiring complex electronics and multiple motors, which is inefficient for high-speed applications like chip transfer apparatuses.
Innovation Solution
A single electric motor with a multi-phase coil arrangement, a rotor having permanent magnets, and a control unit that calculates currents for both torque and axial force generation, optionally with a back iron for increased magnetic flux density, allowing independent control of torque and force without the need for feedback loops or complex control systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional rotating motors are used to perform both rotating and translating movements, then the motor can deliver torque, but it cannot efficiently perform translating movement along the rotation axis
Solution Approach 1:
The motor is designed to perform multiple functions: generating torque for rotation and generating axial force for translation along the rotation axis, using a single motor unit instead of requiring separate motors for each function
Solution Approach 2:
The motor extends its functionality from one dimension (rotational torque only) to two dimensions by adding the capability to generate force along the rotation axis, enabling both rotating and translating movements
2Ease of operation
If a combination rotary and linear motor is used with feedback loops and PI controllers, then torque and linear position can be controlled, but the electronic and software components become complex
Solution Approach 1:
The motor uses self-sensing capabilities where the back EMF signals are directly used to determine rotor position and speed without requiring external sensors or complex feedback loops, and the control algorithm automatically adapts to varying operating conditions
Solution Approach 2:
The motor incorporates a simplified feedback mechanism using back EMF signals from the coils to automatically determine rotor position and adjust control parameters, eliminating the need for complex external sensing and control systems
3Productivity
If high-speed rotating and translating movements are required for chip transfer applications, then productivity increases, but conventional motor systems become inefficient
Solution Approach 1:
The control algorithm dynamically adjusts current parameters and control strategy based on the motor's axial position and operating conditions, optimizing performance for high-speed operations and improving energy efficiency across different operating ranges
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 configuration enables efficient, high-speed, and high-productivity rotating and translating movements with reduced complexity and components, suitable for space-constrained applications like chip transfer apparatuses.
Implementation Method 1
a stator, said stator comprising a multi-phase coil arrangement and comprising a plurality of coils or coil sets and a rotor, said rotor movable in an axial direction of a rotational axis thereof and comprising a plurality of poles respectively comprising at least one permanent magnet
Implementation Method 2
each current (Ir, Is, It) comprises a current component (IrΦ, IsΦ, ItΦ) for generating a torque and a current component (Irx, Isx, Itx) for generating an axial force
Implementation Method 3
at least one of: said stator; and said rotor, comprises a back-iron
Data Source
AI summary
The disclosed device includes a single electric motor for linear and rotary movement with a stator. The stator includes a multi-phase coil arrangement with a plurality of coils or coil sets and a rotor. The rotor is movable in an axial direction of a rotational axis thereof and includes a plurality of poles respectively with at least one permanent magnet The device further includes a control unit operative to determine currents (Ir, Is, It) by calculation formulas and based on at least a number of coils or coil sets of the plurality of coils or coil sets, and an angle of rotation of said rotor and a parameter depending on an axial position of the rotor. Each current (Ir, Is, It) has a current component (IrΦ, IsΦ, ItΦ) for generating a torque and a current component (Irx, Isx, Itx) for generating an axial force, and to supply the determined currents in open loop to the number of coils or coil sets, so that the sum of the currents is zero. Further, at least one of the stator and the rotor, includes a back-iron.