Motor Control Apparatus Using Superimposed Voltage Pulses
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Solution Overview
Problem
Continuous operation of electric motors at low voltage and low current leads to increased contact resistance between electric contacts, resulting in unstable motor operation.
Innovation Solution
A controlling apparatus that generates a superimposed signal with a peak voltage higher than the driving signal and applies it to the motor when the driving signal remains below a predetermined voltage for an extended period, preventing contact resistance increase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the motor operates continuously at low voltage and low current, then energy consumption is reduced, but contact resistance between electric contacts increases
Solution Approach 1:
The patent applies periodic high-voltage pulses superimposed on the low-voltage driving signal. This periodic action prevents contact resistance buildup by periodically cleaning the electric contacts through high-voltage discharge, while maintaining low average power consumption during normal operation.
Solution Approach 2:
The patent changes the voltage parameter dynamically by superimposing high-voltage pulses on the low-voltage driving signal. This parameter change allows the system to maintain low voltage operation for energy efficiency while periodically applying high voltage to prevent contact resistance increase.
2Use of energy by stationary object
If the motor operates continuously at low voltage and low current, then power consumption is reduced, but motor operation stability deteriorates
Solution Approach 1:
The controlling apparatus periodically superimposes high-voltage pulses on the low-voltage driving signal. This periodic intervention maintains motor operation stability by preventing contact resistance buildup, while the motor continues to operate at low power consumption during normal conditions.
Solution Approach 2:
The system dynamically changes the voltage parameter by adding high-voltage pulses to the low-voltage driving signal. This parameter modulation ensures stable motor operation by periodically eliminating contact resistance issues while maintaining low average power consumption.
Data Source
AI summary
Provided is controlling apparatus for an electric motor which is driven in accordance with a driving signal input through electric contacts held in slide contact with each other, the controlling apparatus including: a superimposed signal generating unit, which generates a superimposed signal having a peak voltage higher than a voltage of the driving signal; and a controlling unit, which generates the driving signal based on a controlling signal input so as to control the driving of the electric motor, and superimposes the superimposed signal onto the driving signal and output the resultant signal to the electric motor, the controlling unit superimposing the superimposed signal onto the driving signal and outputting the resultant signal to the electric motor when a state in which the driving signal is lower than a predetermined voltage continues for a time period which is longer than a predetermined time period.