PMSM Drive and Generator Switching for Flywheel Resistance Control
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Solution Overview
Problem
Existing exercise equipment with permanent-magnet synchronous motors faces issues such as heat dissipation challenges, inertia constraints, complex resistance control, temperature affecting magnetic fields, lack of energy storage, and efficiency reduction due to electromagnetic field resistance being temperature-dependent, and high noise levels from cooling devices.
Innovation Solution
A driving and resistance control system with an electromagnetic resistance generation device adjacent to the external rotor of a permanent-magnet synchronous motor, utilizing a control device with a processing unit, motor driving circuit, resistance controller, and interlock switch to operate in generator and motor modes, allowing for smooth resistance variation, energy storage, and efficient heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If coils of electromagnetic windings for driving system and resistance system are arranged on a common stator, then device complexity is reduced, but heat dissipation becomes difficult and temperature rises
Solution Approach 1:
The patent divides the electromagnetic windings into separate driving system coils and resistance system coils, arranging them on different stators. This segmentation allows independent heat dissipation paths for each system, solving the heat accumulation problem while maintaining structural organization.
Solution Approach 2:
The resistance system coils are extracted from the common stator and placed on a separate resistance system stator. This extraction enables the resistance system to have its own dedicated heat dissipation path, preventing temperature rise from affecting the driving system.
2Device complexity
If coils of electromagnetic windings for driving system and resistance system are arranged on a common stator, then device complexity is reduced, but resistance control becomes complicated and hard to adjust
Solution Approach 1:
The control system is segmented into independent driving control and resistance control modules. Each module can be adjusted independently without affecting the other, making resistance control simpler and more flexible while maintaining overall system integration.
3Device complexity
If coils of electromagnetic windings for driving system and resistance system are arranged on a common stator, then device complexity is reduced, but high temperature from resistance control affects magnetic field intensity of permanent magnet
Solution Approach 1:
The resistance system coils are extracted from the common stator and placed on a separate resistance system stator. This spatial separation creates independent thermal zones, preventing high temperature from the resistance system from affecting the permanent magnet's magnetic field intensity.
Solution Approach 2:
The patent introduces separate stators as intermediary structures between the driving system and resistance system. These intermediary stators act as thermal barriers, isolating the heat generated by the resistance system from the permanent magnet while maintaining electromagnetic functionality.
4Device complexity
If coils of electromagnetic windings for driving system and resistance system are arranged on a common stator, then device complexity is reduced, but electricity generated by user work cannot be accumulated through backward charging
Solution Approach 1:
The resistance system is designed to generate electricity during user exercise, which is then stored in the energy storage device. The system serves itself by converting mechanical energy from user effort into stored electrical energy, creating a self-sustaining energy cycle without requiring external energy input.
5Ease of operation
If resistance generated by electromagnetic field is used, then resistance control is achieved, but temperature affects resistance to reduce efficiency
Solution Approach 1:
The resistance system coils are extracted to a separate stator with independent thermal management. This allows the resistance system to operate in a thermally isolated environment, maintaining stable electromagnetic resistance characteristics and efficiency even when generating high temperatures.
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 system provides efficient and accurate driving and resistance control, enables energy storage from user work, reduces noise and environmental impact, and maintains high efficiency and accuracy, making it environmentally friendly and energy-saving.
Implementation Method 1
the permanent-magnet synchronous motor operating in a generator mode, so that a generation voltage is generated
Implementation Method 2
An electromagnetic resistance generation device is arranged on an outer circumference of the external rotor of the permanent-magnet synchronous motor
Data Source
AI summary
A driving and resistance control system for a permanent-magnet synchronous motor is disclosed. A control device includes a processing unit, a motor driving circuit, a resistance controller, and an interlock switch. In a first operation mode, the interlock switch makes the motor driving circuit and the permanent-magnet synchronous motor open-circuiting, and connecting stator windings of the permanent-magnet synchronous motor to the resistance controller, and under this condition, the external rotor of the permanent-magnet synchronous motor is rotated by spinning of a flywheel, so that the permanent-magnet synchronous motor is operating in a generator mode to generate a resisting force to the flywheel by mesas of a resistance generation device. In a second operation mode, the interlock switch makes the motor driving circuit and the permanent-magnet synchronous motor closed-circuiting and cutting off control of the resistance controller, and electrical energy is supplied from the power supply circuit to the permanent-magnet synchronous motor, so as to make the permanent-magnet synchronous motor operating in a motor mode to induce an acceleration on the external rotor.