MR-Compatible Electric Motor Drive Using Lorentz Force
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Solution Overview
Problem
Existing magnetic resonance-compatible drives are expensive and limited in speed due to their pneumatic design, which requires compressed air and has electromagnetic valves outside the examination space, causing delays in motor control.
Innovation Solution
A magnetic resonance-compatible drive using an electric motor with a stator composed of the dominant component of the basic magnetic field, featuring a rotatable coil element that generates a drive moment through Lorentz force, allowing for a compact, inexpensive, and fast operation without the need for compressed air.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pneumatic drive is used, then the drive is magnetic resonance-compatible, but the speed is limited due to pressure build-up delay
Solution Approach 1:
The patent replaces the pneumatic drive system with an electric motor system. The electric motor uses electromagnetic fields to generate rotational force, eliminating the need for compressed air and electromagnetic valves. This substitution resolves the speed limitation caused by pressure build-up delays while maintaining magnetic resonance compatibility through careful design of the motor components.
Solution Approach 2:
The patent extracts and removes the electromagnetic valves and compressed air supply system from the drive mechanism. By eliminating these components that cause delays and complexity, the invention achieves faster response times while maintaining the essential function of magnetic resonance compatibility through the use of non-magnetic materials and shielded electromagnetic components.
2Ease of operation
If a pneumatic drive with valves is used, then the drive can be controlled, but the cost is high and the structure is complex
Solution Approach 1:
The patent replaces the complex pneumatic valve system with a simplified electric motor control system. The electric motor can be directly controlled through electronic signals, eliminating the need for multiple pneumatic valves, pressure regulators, and air supply infrastructure. This reduces both structural complexity and cost while maintaining precise control capability.
Solution Approach 2:
The electric motor serves multiple functions simultaneously: it provides rotational force, enables precise positioning, and can be controlled through standard electronic interfaces. This multi-functionality replaces what previously required separate pneumatic components for each control function, simplifying the overall system architecture.
3Ease of manufacture
If a pneumatic drive is used, then the drive can be implemented, but compressed air is required and the system is expensive
Solution Approach 1:
The patent substitutes the pneumatic drive system with an electric motor system, eliminating the requirement for compressed air infrastructure. This removes the need for air compressors, air lines, pressure regulators, and associated safety equipment, thereby reducing system complexity and implementation barriers while maintaining drive functionality.
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
The solution provides a cost-effective, compact, and high-speed magnetic resonance-compatible drive that can be used within a magnetic resonance system without interfering with the measurement, enabling efficient robot-assisted interventions and calibration tasks.
Implementation Method 1
featuring a rotatable coil element that generates a drive moment through Lorentz force
Data Source
AI summary
A magnetic resonance (MR) system may include a MR device and a MR-compatible drive. The MR device may include a scanner with a basic magnet for generating a homogeneous basic magnetic field. The MR-compatible drive may include an electric motor with a stator. The stator of the electric motor may include a dominant component of the basic magnetic field of the basic magnet.