Brushless Sensorless Vacuum Pump for Wear Reduction

The patent replaces the mechanical brush-commutator contact system with an electronic commutation system using Hall effect sensors and electronic control circuitry. This substitution eliminates the mechanical wear between brushes and slip rings while extending operating time, resolving the contradiction between manufacturing cost and durability.

The patent changes the fundamental operating parameters of the drive motor from mechanical contact-based commutation to sensor-based electronic commutation. By altering the commutation mechanism from physical brush contact to electronic switching controlled by Hall sensors, the system achieves extended operational life while maintaining cost-effectiveness through reduced maintenance requirements.

The patent implements feedback control through Hall effect sensors that detect rotor position and provide real-time information to the electronic commutation system. This feedback mechanism enables the control circuit to accurately determine rotor position and direction, preventing unintended bidirectional rotation while maintaining the wear-free advantages of brushless operation.

The patent replaces mechanical direction control mechanisms with electronic control based on sensor feedback. The electronic commutation system uses Hall sensors to detect rotor position and controls the phase sequencing electronically, eliminating the need for mechanical direction reversal mechanisms and enabling precise unidirectional operation.

The patent designs the pump housing with inlet and outlet ports that serve multiple functions depending on rotation direction. The same physical ports handle both suction and discharge operations in different rotational modes, eliminating the need for separate dedicated ports for each direction and reducing overall device complexity while maintaining bidirectional efficiency.

The patent employs a symmetric pump chamber design where the flow paths are inverted when rotation direction changes. The inlet and outlet ports swap functional roles based on rotation direction, allowing the same structural configuration to efficiently handle fluid flow in both directions without requiring additional openings or complex flow path arrangements.