Motor Torque Control for Adjustable Inertia in Exercise Actuators
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Solution Overview
Problem
Traditional exercise devices require manual adjustment of tension and are limited in versatility and maximum weight, lacking the ability to provide dynamic resistance and instantaneous tension changes.
Innovation Solution
A digital exercise device using a three-phase permanent magnet synchronous motor to generate electromagnetic resistance, controlled by a processor to apply tension dynamically and continuously, simulating the experience of traditional weight stacks with electronic control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If traditional weight stacks are used, then maximum weight is limited by physical space, but the device can provide real inertia experience
Solution Approach 1:
The patent replaces the traditional mechanical weight stack system with an electromagnetic motor system. The motor generates force electronically controlled, eliminating physical weight stack limitations while enabling dynamic inertia adjustment through software control of the motor's electrical characteristics.
Solution Approach 2:
The patent changes the physical parameters of the system by using a motor with controllable electrical parameters (voltage, current, frequency) to replace fixed mechanical weights. This allows continuous adjustment of force output and simulated inertia without physical reconfiguration.
2Adaptability or versatility
If manual tension adjustment is used, then device structure is simple, but versatility and tension change speed are limited
Solution Approach 1:
The patent replaces manual mechanical tension adjustment mechanisms with an electronically controlled motor system. The motor's torque and speed are controlled through electrical signals, enabling instantaneous and precise tension changes without mechanical linkages or manual intervention.
Solution Approach 2:
The patent introduces dynamic control capabilities where the motor can continuously adjust its output characteristics in real-time based on programmed exercise protocols, enabling versatile tension patterns that adapt during exercise execution.
3Speed
If electronic control is used, then instantaneous tension changes are possible, but the device lacks traditional inertia feel
Solution Approach 1:
The patent applies preliminary anti-action by programming the motor control system to anticipate and compensate for the lack of mechanical inertia. The controller pre-adjusts electrical parameters to simulate the inertial characteristics of traditional weight stacks, counteracting the abruptness of electronic tension changes.
Solution Approach 2:
The patent modifies the electrical parameters of the motor control to simulate mechanical inertia effects. By adjusting current ramp rates, voltage profiles, and frequency modulation, the system creates force transitions that mimic the gradual acceleration and deceleration characteristics of physical weight stacks.
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 with adjustable inertia, providing versatile and efficient resistance training by allowing continuous tension changes and real-time adjustments.
Implementation Method 1
A digital exercise device using a three-phase permanent magnet synchronous motor to generate electromagnetic resistance
Data Source
AI summary
Torque that is requested of a motor is adjusted to generate an experienced inertia different from a mechanical inertia of an actuator. The motor provides resistance to the actuator. The actuator is coupled to the motor.