Motor Insulation Resistance Measurement Interruption Handling
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Solution Overview
Problem
The existing motor driving devices require longer measurement times for insulation resistance as the number of motors increases, and interruptions in measurement lead to the need to restart from the beginning, prolonging the process unnecessarily.
Innovation Solution
A motor driving device with a converter unit, inverter units, an insulation resistance measuring unit, a measurement interrupting unit, a storage unit, and a measurement resuming unit that allows for sequential measurement of insulation resistance across multiple motors, storing information on the selected motor and resuming from the interrupted point to avoid re-measuring completed motors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the insulation resistance of multiple motors is measured by sequentially selecting each motor one by one, then the insulation resistance of each motor can be measured, but the measurement time becomes longer as the number of motors increases
Solution Approach 1:
The control unit stores the measurement progress information (which motor was being measured when interrupted) in advance before the measurement is interrupted. This preliminary storage of state information enables the system to resume measurement from the correct position without re-measuring already completed motors, thereby reducing total measurement time while maintaining measurement precision
2Ease of operation
If the measurement is interrupted for some reason while measuring the insulation resistance of multiple motors in turn, then the measurement can be stopped temporarily, but the insulation resistance must be measured again from the beginning, making the measurement time longer than needed
Solution Approach 1:
The control unit continuously monitors the measurement state and provides feedback by storing which motor was selected as the measurement target when interrupted. Upon resumption, this feedback information is retrieved to determine the correct starting point, ensuring that already-measured motors are not measured again, thus maintaining ease of operation while minimizing time loss
Solution Approach 2:
Before interruption occurs, the system preliminarily stores the measurement state information (current motor index, measurement progress). This preliminary action ensures that when measurement is resumed, the system can immediately continue from the correct position without losing time on re-measurement, while still allowing easy interruption when needed
Data Source
AI summary
A motor driving device includes: an insulation resistance measuring unit configured to measure insulation resistance of a motor selected as a measurement target to thereby measure the insulation resistance of each of the multiple motors; a measurement interrupting unit configured to interrupt measurement of insulation resistance if a measurement interrupt condition is established; a storage unit configured to store information indicating the motor selected as the measurement target at the time of interruption of the measurement of insulation resistance; and a measurement resuming unit configured to, when measurement is resumed, resume measurement of the insulation resistance sequentially from the motor that had been selected as the measurement target when the measurement was interrupted, based on the information stored in the storage unit.