Air-Driven Alternator for Electrostatic Spray Gun
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Solution Overview
Problem
Conventional electrostatic spray guns require high voltages (20,000 - 100 kV) and complex external power sources to generate an intense electrostatic field for efficient spraying, which can be cumbersome and inefficient.
Innovation Solution
An electrostatic spray gun with an air-driven turbine-powered alternator that generates electrical power internally, using a Neodymium magnet rotor and copper wire windings to produce a compact and efficient electromagnetic alternator, reducing size and weight by 40% and improving responsiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If an external power source is used to generate high voltage for the electrostatic field, then the required voltage level is achieved, but the device complexity and size increase
Solution Approach 1:
The patent combines the power generation function directly into the spray gun by integrating a turbine and alternator assembly within the gun housing. This merging of functions eliminates the need for separate external power sources and voltage multipliers, reducing overall system complexity while maintaining the required high voltage output for electrostatic field generation
Solution Approach 2:
The spray gun becomes self-powered through the integration of a turbine driven by compressed air from the spray system itself. The alternator converts this mechanical energy into electrical energy to generate the high voltage needed for the electrostatic field, allowing the device to serve its own power needs without external intervention
2Volume of moving object
If a compact alternator design is used, then the size and weight are reduced, but the ability to generate sufficient electrostatic field intensity may be compromised
Solution Approach 1:
The patent achieves compact size while maintaining field intensity by changing key parameters of the alternator design: using a high-speed turbine (10,000-20,000 RPM), employing a voltage multiplier circuit to boost output voltage, and optimizing the alternator winding configuration. These parameter changes allow a small alternator to generate sufficient high voltage for the electrostatic field
Solution Approach 2:
The high-speed rotating turbine and alternator create periodic electromagnetic induction at high frequency, which when combined with the voltage multiplier, generates the intense electrostatic field needed. The rapid rotational speed compensates for the small size by increasing the rate of magnetic flux change, thereby maintaining field intensity in a compact form
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 compact alternator design reduces overspray and improves operational efficiency by generating a strong electrostatic field with lower volume and weight requirements, enhancing the responsiveness and reliability of the spray gun.
Implementation Method 1
an air-driven turbine that drives an electromagnetic alternator
Implementation Method 2
an air-driven turbine that drives an electromagnetic alternator
Implementation Method 3
The charged particles are thereby attracted to the article to be sprayed
Data Source
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AI summary
An alternator, such as for use in an electrostatic spray gun, comprises an alternator housing, a stator, a rotor, a shaft, a first bearing and a sheath. The stator is inserted into the alternator housing and has an inner diameter and an outer diameter. The rotor is disposed within the inner diameter of the stator. The shaft extends from the rotor and is rotatably supported by a first bearing. The sheath surrounds the outer diameter, supports the stator with respect to the alternator housing, and supports the bearing.