Motor Speed Control via Residual Voltage Measurement
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Solution Overview
Problem
Traditional systems for controlling and adjusting the operation of devices actuated by electric motors are cumbersome, difficult to assemble, and prone to damage, especially in applications like beverage dispensing machines where variations in rotation speed due to scale buildup or debris affect the quality of dispensed fluids.
Innovation Solution
A process and apparatus that temporarily shuts down the electric motor to allow it to operate as a voltage generator, measuring the residual voltage to determine the rotation speed and adjust operating parameters, enabling real-time feedback control and diagnostic monitoring without the need for complex wiring or external instrumentation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional speedometers, encoders, or stroboscopes are used to monitor rotation speed, then measurement precision is improved, but device complexity and ease of manufacture deteriorate due to complicated assembly, calibration, and wiring requirements
Solution Approach 1:
The motor serves itself by generating residual voltage during free rotation that can be measured to determine rotation speed. The motor's own electrical characteristics are utilized for self-diagnosis and self-regulation, eliminating the need for external measurement devices.
Solution Approach 2:
The patent replaces mechanical measurement devices (speedometers, encoders) with an electrical measurement approach. By measuring the electrical voltage generated during free rotation, the system substitutes complex mechanical instrumentation with simple voltage sensing.
2Measurement precision
If traditional measurement devices are installed on rotating parts, then measurement precision is improved, but reliability deteriorates due to easy damage and need for periodic verification
Solution Approach 1:
The motor's electrical system is used to monitor its own operational status. By measuring residual voltage generated during brief free rotation periods, the system continuously self-diagnoses without requiring external sensors that could fail.
Solution Approach 2:
The control unit acts as an intermediary that processes the residual voltage signal to extract rotation speed information. This intermediary approach allows non-contact, damage-free measurement since the voltage is measured electrically rather than through physical sensors on the rotating parts.
3Manufacturing precision
If the pump rotation speed decreases due to scale buildup, then manufacturing precision is worsened, but using traditional devices to detect this increases device complexity
Solution Approach 1:
The system establishes a feedback loop where the measured residual voltage during free rotation provides information about current rotation speed. This feedback is used to detect deviations from optimal performance and trigger adjustments to maintain precise fluid dispensing.
Solution Approach 2:
Instead of using complex mechanical monitoring systems to detect scale buildup effects, the patent substitutes electrical measurement of residual voltage. This provides a simple, integrated way to monitor performance degradation and maintain manufacturing precision.
4Productivity
If the motor is continuously operated to maintain productivity, then productivity is improved, but measurement precision deteriorates because traditional devices cannot accurately measure speed under load
Solution Approach 1:
The system uses periodic brief interruptions of power supply to the motor during operation. During these short free rotation periods, the residual voltage is measured to determine actual rotation speed, providing accurate measurement without stopping continuous productivity.
Solution Approach 2:
The system performs preliminary measurement of residual voltage during brief free rotation before the motor is fully re-engaged. This preliminary action provides accurate speed data that can be used to adjust operating parameters while maintaining continuous productivity.
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 solution allows for precise and continuous adjustment of motor speed and operation, minimizing the impact of variations in rotation speed, ensuring optimal fluid dispensing and reducing maintenance needs, while being cost-effective and compact.
Implementation Method 1
measuring the residual voltage generated by the electric motor during the time interval in which the motor is not supplied with power and in which the motor operates as a voltage generator
Data Source
AI summary
Controlling and adjusting of the operation of a device actuated by an electric motor are carried out by shutting down the electric power supply of said electric motor at a plurality of time intervals during the motor operation, measuring in the time interval the voltage supplied by the electric motor, comparing the value of the measured voltage with a reference value and, if required on the basis of said comparison, varying at least one parameter related to the functioning of the device in order to compensate possible deviations.