Motor Control Circuit Using Voltage Thresholds

Solution Overview

Problem

Existing motor control systems waste energy by continuously supplying driving voltage to motors even when the driven mechanism is idle, as they rely on timing methods that fail to dynamically respond to voltage changes and control power consumption effectively.

Innovation Solution

A motor control circuit system with a processor unit, sensor, and converter that dynamically controls AC current to the motor based on predetermined voltage thresholds, allowing the motor to operate intermittently and utilize inertia during idling, thereby reducing energy consumption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the motor is continuously supplied with driving voltage to ensure it runs, then the motor can maintain operation, but energy is wasted when the driven mechanism is idle

Engineering Contradiction:

Improvemotor operation continuityVSAvoidenergy consumption

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The patent applies periodic action by controlling the motor to operate intermittently rather than continuously. The controller detects voltage thresholds and activates the motor only when the voltage reaches the predetermined threshold, allowing the motor to cycle between on and off states. This periodic operation enables the driven mechanism to utilize inertia during off periods while ensuring the motor restarts when voltage conditions are met, thereby reducing energy consumption without completely compromising operational reliability.

Inventive Principle:

Principle #19Periodic action

2Adaptability or versatility

If a timer relay is used to control motor activation, then the motor can be energized at specific time intervals, but the system cannot dynamically respond to voltage changes

Engineering Contradiction:

Improveresponse to voltage changesVSAvoidcontrol system complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent replaces the mechanical timer relay system with an electronic voltage detection and control system. Instead of using a timer-based mechanical switch, the invention employs a controller with voltage sensing capabilities that continuously monitors the voltage and activates the motor based on real-time voltage threshold comparisons. This substitution enables dynamic adaptation to voltage changes while maintaining relatively simple system architecture through electronic control logic.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent implements feedback by continuously detecting the voltage level and using this information to control motor activation. The controller monitors the voltage signal and compares it against a predetermined threshold, activating the motor only when the voltage reaches the threshold level. This feedback mechanism enables the system to dynamically respond to voltage changes rather than following a fixed timing schedule, improving adaptability while keeping the control logic straightforward.

Inventive Principle:

Principle #23Feedback

3Productivity

If the motor operates continuously to drive the mechanism, then the mechanism receives consistent power, but the motor cannot utilize inertia for energy saving

Engineering Contradiction:

Improvemechanism operation consistencyVSAvoidmotor power consumption

Core Design Contradiction:

ProductivityVSUse of energy by moving object

Solution Approach 1:

The patent applies periodic action by controlling the motor to operate intermittently rather than continuously. The controller detects voltage thresholds and activates the motor only when the voltage reaches the predetermined threshold, allowing the motor to cycle between on and off states. This periodic operation enables the driven mechanism to utilize inertia during off periods while ensuring the motor restarts when voltage conditions are met, thereby reducing energy consumption without completely compromising operational reliability.

Inventive Principle:

Principle #19Periodic action

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 system significantly reduces power consumption by only energizing the motor when input voltage reaches a predetermined threshold, enhancing reliability through dynamic voltage detection rather than time-based methods, and allowing for adjustable rotational speed based on voltage levels.

Implementation Method 1

a motor (2) driven by an alternating current

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Implementation Method 2

a sensor (3) electrically linked to the processor unit

Methodology Applied

Scientific EffectElectrical field detection: Electric Field

Data Source

PatentUS20190267920A1Motor control circuit system

Publication Date: 2019.08.29 CHEN DER SAN

AI summary

A motor control circuit system is arranged to control the activation of a motor when the input voltage of the motor equals to a predetermined threshold so as to save the power consumption of the motor, wherein no current is allowed to pass to the motor before the input voltage of the motor reaches again the predetermined threshold. Therefore, the motor is electrified in an intermittent manner, such that the driven mechanism runs with its inertia even though the motor is idling, i.e. no current passing to the motor, so as to save the energy consumption of the motor.