Planar Drive Stator PWM Ripple for Wireless Rotor Power
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Solution Overview
Problem
Existing planar drive systems face challenges in efficiently and reliably transferring energy wirelessly from a stator to a rotor, particularly due to limitations in the generation and utilization of alternating magnetic fields.
Innovation Solution
The proposed planar drive system employs a stator with energizable stator conductors that use current control based on pulse-width modulation (PWM) to generate a ripple current and an alternating magnetic field. This field induces an alternating voltage in the rotor coil, enabling efficient wireless power transfer without the need for additional primary coils.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If pulse-width modulation is used to control stator conductors, then wireless power transfer efficiency is improved, but ripple current and alternating magnetic field generation may cause energy losses
Solution Approach 1:
The patent converts the harmful ripple current and alternating magnetic field, which are side effects of PWM control, into a useful function for wireless power transfer. The stator conductors are designed to function both as drive coils and as primary coils for inductive power transfer. The alternating magnetic field generated by the ripple current induces voltage in the rotor coil, enabling efficient wireless energy transfer from stator to rotor.
2Power
If additional primary coils are added to the stator for wireless power transfer, then power transfer capability is improved, but device complexity increases
Solution Approach 1:
The stator conductors are designed to serve dual functions: they act as drive coils for producing the magnetic field that drives the rotor, and simultaneously function as primary coils for inductive power transfer to the rotor coil. This multi-functionality eliminates the need for separate primary coils, reducing device complexity while maintaining wireless power transfer capability.
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 achieves reliable and efficient wireless power transfer by leveraging the ripple current and alternating magnetic field generated by the PWM-controlled stator conductors, thereby enhancing the energy transfer efficiency and independence from the rotor's position.
Implementation Method 1
The stator is configured to carry out the energizing of the stator conductors by a current control based on a pulse-width modulation
Implementation Method 2
an alternating voltage may be induced due to the alternating magnetic field
Implementation Method 3
an alternating voltage may be induced due to the alternating magnetic field
Implementation Method 4
a magnetic interaction may be caused between energized stator conductors and the magnet device of the rotor
Data Source
AI summary
A planar drive system comprises a stator and a rotor. The stator comprises a plurality of stator conductors. The rotor comprises a magnet device comprising at least one rotor magnet. The stator is configured to energize the stator conductors. A magnetic interaction can be produced between energized stator conductors of the stator and the magnet device of the rotor in order to drive the rotor. The stator is configured to carry out the energizing of the stator conductors by a current control based on a pulse-width modulation. Due to the current control, a ripple current in energized stator conductors of the stator and thereby an alternating magnetic field can be generated. The rotor comprises at least one rotor coil in which an alternating voltage can be induced due to the alternating magnetic field.