Low-Voltage Brushless DC Motor Torque Control for Viscous Pumping
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Solution Overview
Problem
Conventional electric motors are inadequate for applications requiring high torque at variable loads, such as sewage pumping, due to insufficient starting torque and inefficiencies in existing alternative energy systems, particularly when operating at low voltages.
Innovation Solution
A brushless DC motor configured for low DC voltage (40-60 VDC) with a rotor and stator laminations optimized for high torque output, coupled with a high-resolution controller and noise filtering components to manage variable loads and reduce energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If conventional electric motors are used for sewage pumping, then the motor can operate at higher voltages (>100V ac/dc), but the motor provides insufficient starting torque and cannot handle variable high torque loads
Solution Approach 1:
The patent changes the electrical parameters by designing a motor specifically for low voltage DC operation (40-60VDC) rather than conventional high voltage AC/DC. This parameter change enables the motor to deliver high starting torque and handle variable loads effectively, resolving the contradiction between torque capability and load handling reliability
Solution Approach 2:
The motor incorporates dynamic control capabilities with electronic commutation and feedback circuits that can adjust torque output in real-time. This dynamic response allows the motor to maintain reliability under variable loads while providing high starting torque, addressing both aspects of the contradiction
2Adaptability or versatility
If alternative energy systems with battery banks are used to power the motor, then the system can operate off-grid, but the quiescent current requirements create constant drain on the battery system
Solution Approach 1:
The motor system incorporates feedback circuits and control mechanisms that monitor and optimize power consumption in real-time. This self-service capability allows the system to maintain off-grid operation while minimizing energy drain on battery systems, resolving the contradiction between adaptability and energy efficiency
Solution Approach 2:
The motor is designed with optimized winding configurations and magnetic circuits that reduce copper losses and iron losses. These parameter optimizations enable efficient operation at low voltages, reducing the energy consumption that would otherwise drain battery systems, thus resolving the contradiction
3Duration of action of moving object
If AC motors are used with mains voltage inverters, then the system can provide continuous power, but the motors do not provide sufficient starting torque and the inverters add quiescent current drain
Solution Approach 1:
The patent replaces the AC motor-inverter system with a brushless DC motor directly powered by battery systems. This substitution eliminates the inverter and its quiescent current drain while providing superior starting torque, resolving the contradiction between continuous operation and starting torque capability
Solution Approach 2:
The brushless DC motor incorporates dynamic torque control through electronic commutation and feedback circuits, enabling it to deliver high starting torque while maintaining continuous operation capability. This dynamic control resolves the contradiction between starting performance and continuous operation
4Power
If the motor is designed for high power output (~1 kW), then the motor can operate at economically viable levels, but conventional motors are wound for higher voltages that are incompatible with alternative energy systems
Solution Approach 1:
The patent fundamentally changes the voltage parameter from conventional high voltage (>100V ac/dc) to low voltage DC (40-60VDC). This parameter change enables compatibility with alternative energy battery systems while maintaining high power output capability through optimized current handling and reduced losses
Solution Approach 2:
The motor employs composite construction with optimized magnetic circuits, winding configurations, and laminated stators that enable high power density at low voltages. This composite design approach allows the motor to achieve ~1 kW power output while being compatible with low-voltage battery systems, resolving the contradiction between power and adaptability
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 solution provides reliable high torque and efficient operation under variable loads, significantly improving hydraulic performance and reducing energy requirements, enabling prolonged operation on renewable energy sources.
Implementation Method 1
a rotor with permanent magnets; a stator with a stack of laminations and windings wound therearound
Implementation Method 2
the windings and the stack of laminations are configured to handle at least 1 kW of continuous electric power
Data Source
AI summary
An electric motor for viscous pumping, wherein the electric motor is a brushless DC motor configured to be driven by a low DC voltage of around 40-60 VDC, and includes: a rotor with permanent magnets; a stator with a stack of laminations and windings wound therearound; and a controller to provide electronic commutation of electric current flowing through the windings; wherein the windings and the stack of laminations are configured to handle at least 1 kW of continuous electric power from the controller, and the controller includes a feedback circuit including a rotation sensor coupled to the rotor and having an angular resolution of at least 1/500th of a revolution to allow the controller to control the torque generated by the electric motor to a corresponding extent.