Digital Exercise Resistance Control for Higher Concentric Torque
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Solution Overview
Problem
Traditional exercise devices lack the ability to provide dynamic resistance that can change nearly instantaneously and adjust tension continuously based on user movement, limiting the versatility and effectiveness of strength training.
Innovation Solution
A digital exercise device using a three-phase permanent magnet synchronous motor (PMSM) with dynamic torque control to generate resistance electronically, allowing for continuous adjustment of tension and resistance based on position and phase of the exercise movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional exercise devices use fixed mechanical resistance, then the device structure is simple, but the adaptability and versatility are limited
Solution Approach 1:
The patent replaces traditional mechanical resistance systems with an electronic motor system (PMSM) that provides dynamic torque control. The motor can generate resistance electronically through software control, allowing continuous adjustment of tension and resistance levels without complex mechanical components like weight stacks or spring mechanisms. This substitution enables high adaptability while maintaining relatively simple device structure.
Solution Approach 2:
The patent implements dynamic resistance by allowing the motor torque to change continuously based on position and phase of the exercise movement. The system can adjust resistance in real-time during the exercise cycle, providing different resistance levels for concentric and eccentric phases. This dynamic control significantly improves versatility without requiring multiple fixed resistance mechanisms.
2Productivity
If traditional exercise devices use fixed weight resistance, then the device is simple to manufacture, but the ability to provide dynamic resistance that changes instantaneously is limited
Solution Approach 1:
The patent replaces fixed mechanical weight resistance with an electronic motor system that can instantaneously adjust resistance levels through software control. The PMSM motor with electronic torque control can simulate various resistance profiles and change them instantly without physical reconfiguration, dramatically improving productivity and training efficiency while keeping manufacturing straightforward.
Solution Approach 2:
The patent changes the resistance parameter dynamically through electronic control of motor torque. Instead of physically changing weights, the system adjusts the torque output of the motor based on position, speed, and exercise phase, enabling instantaneous resistance changes that improve training effectiveness without complicating the manufacturing process.
3Force
If digital exercise device increases torque requestable during concentric phase, then the maximum weight capability is improved, but the motor control complexity increases
Solution Approach 1:
The patent implements dynamic torque control where the motor torque is adjusted in real-time based on the exercise phase. During the concentric phase, the system increases the requestable torque to enable greater maximum weight capability. This dynamic adjustment is achieved through software control of the motor driver, which modifies torque commands based on position and velocity feedback, improving force capability while managing complexity through intelligent control algorithms.
Solution Approach 2:
The patent uses feedback from position and velocity sensors to dynamically adjust motor torque during the concentric phase. The control system monitors exercise phase and provides enhanced torque support when needed, enabling users to lift heavier weights during the lifting phase while maintaining appropriate resistance during other phases. This feedback-based control achieves high force capability with manageable system complexity.
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
Enables greater maximum weight in the concentric phase of exercise movements and provides versatile, efficient, and engaging workout experiences by dynamically controlling inertia and resistance.
Implementation Method 1
A digital exercise device using a three-phase permanent magnet synchronous motor (PMSM) with dynamic torque control to generate resistance electronically
Implementation Method 2
three-phase permanent magnet synchronous motor (PMSM)
Data Source
AI summary
During at least a portion of a user exercise movement in which an actuator velocity of an actuator is in an outward direction, an amount of torque that is requestable from a motor is increased based at least in part on the actuator velocity. The motor provides resistance to the actuator. The actuator is coupled to the motor.