Magnetic Drive for Food Processor to Eliminate Seal Wear and Noise
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Solution Overview
Problem
Conventional blenders and mixers face issues with mechanical coupling wear, noise, height, weight, and gyroscopic effects due to mechanical drive systems, which limit their compactness, ease of use, and efficiency in food processing applications.
Innovation Solution
A magnetic drive system for food processing equipment that uses a rotating shaft with permanent magnet poles outside the food-contact chamber and a driven member with laminated soft magnetic pole elements inside, supported by a rotating shaft, to transmit torque without mechanical contact, allowing for compact, lightweight, and vibration-controlled operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mechanical drive system is used with a rotary seal at the base of the cup, then torque transmission is achieved, but wear and friction increase over time
Solution Approach 1:
The patent replaces the mechanical drive system with a magnetic drive system. A permanent magnet rotor in the motor base creates a rotating magnetic field that induces eddy currents in a conductive drive plate at the base of the cup, which in turn creates a magnetic field to rotate the impeller. This eliminates the need for rotary seals and mechanical bearings in the cup base, removing the wear and friction problems associated with mechanical contact.
2Power
If a mechanical coupling with projections and depressions is used to connect the cup and motor base, then torque transmission is achieved, but noise is generated
Solution Approach 1:
The patent eliminates the noisy mechanical interlocking coupling between the cup and motor base by using a magnetic drive system. The magnetic field couples the motor rotor to the impeller through the conductive drive plate without requiring physical contact or mechanical engagement features, thereby eliminating the noise generated by mechanical coupling.
3Area of stationary object
If the motor is positioned directly under the blender cup, then compact footprint is achieved, but overall height increases
Solution Approach 1:
The patent positions the motor laterally adjacent to the cup rather than directly underneath it, utilizing the horizontal dimension to accommodate the motor housing. This lateral positioning, combined with the magnetic drive system that transmits torque through the base structure, achieves a compact footprint while avoiding the height increase that would result from a vertically stacked configuration.
4Power
If a mechanical coupling system is used between the cup and base, then torque transmission is achieved, but ease of removing and returning the cup is reduced
Solution Approach 1:
The patent replaces the mechanical coupling system with projections and depressions with a magnetic drive system. The motor base generates a rotating magnetic field that acts on a conductive plate in the cup base, transmitting torque without requiring mechanical interlocking features. This allows the cup to be easily removed and installed without the constraints of mechanical coupling, while still achieving effective torque transmission during operation.
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 magnetic drive system reduces wear, noise, and gyroscopic effects, enabling a compact, lightweight, and efficient food processing solution with improved speed control and ease of handling, while maintaining effective torque transmission and safety features.
Implementation Method 1
A magnetic drive system for food processing equipment that uses a rotating shaft with permanent magnet poles outside the food-contact chamber and a driven member with laminated soft magnetic pole elements inside, supported by a rotating shaft, to transmit torque without mechanical contact
Implementation Method 2
a driven member with laminated soft magnetic pole elements inside, supported by a rotating shaft, to transmit torque without mechanical contact
Implementation Method 3
a driven member comprises a drive plate comprising a plurality of discrete pole elements formed from laminated layers, wherein layers of soft magnetic material are separated by layers of a non-magnetic material
Data Source
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AI summary
Food processing apparati including magnetic drives are described herein. According to one exemplary embodiment, a food processing apparatus may include a motor having a motor shaft, a rotor rotatably mounted on the motor shaft, and a stator producing an electromagnetic field for interacting with the rotor. The rotor may magnetically drive a drive plate coupled to an impeller inside a food-contact chamber.