Electrostatic Motor Plate Layout for Higher Power Density
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Solution Overview
Problem
Existing electrostatic machines suffer from low power density and complexity in managing capacitive interfaces, which limits their efficiency and reliability.
Innovation Solution
The electrostatic machine design includes a rotor plate and a stator plate with a coupled bearing radially located greater than or equal to 50% from the shaft to the outermost extent of the plate, and a race radially aligned with the coupled bearing, configured to maintain a minimum separation distance between the plates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If electrostatic machines use capacitive principles to generate torque at zero or low speeds with higher inherent voltages, then the ability to generate low loss torque is improved, but the power density remains low
Solution Approach 1:
The machine is divided into multiple stator plates and rotor plates arranged in a stacked configuration. Each plate pair contributes to torque generation, allowing the system to achieve higher power density through cumulative effect while maintaining the capacitive principle advantage of low loss torque generation at zero or low speeds
Solution Approach 2:
The patent transitions from a single-plane capacitor arrangement to a multi-layer stacked plate configuration, adding the axial dimension to the traditional radial arrangement. This dimensional change increases the effective capacitance and torque generation surface area without proportionally increasing the machine footprint, thereby improving power density
2Ease of operation
If electrostatic machines operate at higher inherent voltages than inductive machines, then operational efficiency is improved, but the complexity of managing capacitive interfaces increases
Solution Approach 1:
The control system is designed to manage multiple capacitive interfaces simultaneously using a unified control strategy. The same switching network and control logic are applied across all stator-rotor plate pairs, allowing the system to operate efficiently at higher voltages without proportionally increasing management complexity through standardization and reuse of control elements
Solution Approach 2:
A switching network acts as an intermediary between the high voltage power source and the multiple capacitive interfaces. This intermediary component manages the complex connections and switching requirements, enabling efficient operation at higher voltages while isolating the complexity within a dedicated control layer rather than分散 across all interfaces
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
This design enhances the power density and simplifies the management of capacitive interfaces, leading to improved efficiency and reliability of the electrostatic machine.
Implementation Method 1
a coupled bearing on the first one of the rotor plate or stator plate, and a race on the other one of the rotor plate or stator plate radially aligned with the coupled bearing
Implementation Method 2
Electrostatic machines operate on capacitive principles rather than inductive principles
Data Source
AI summary
An example system including an electrostatic machine including a rotor plate comprising a plurality of rotor electrodes, and rotatably fixed to a shaft configured to rotate about an axis; a stator plate comprising a plurality of stator electrodes, and rotatably fixed to a housing defining the rotor plate, the stator plate, and at least a portion of the shaft; an excitation circuit electrically; a controller, comprising: a rotor feedback circuit structured to interpret a voltage response value; a rotor position characterizing circuit structured to determine a voltage injection value; and a rotor position circuit structured to determine a calibrated rotor position value in response to the rotor position value; and wherein the excitation circuit is responsive to the voltage injection value to inject a voltage on at least one of the plurality of rotor electrodes or stator electrodes.