Motor Control Initial Drive Prohibition for Lifespan
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Solution Overview
Problem
Brushless switched reluctance motors face damage and reduced lifespan due to repeated initial drive cycles caused by frequent on-off usage, leading to unexpected temperature increases.
Innovation Solution
A motor controlling device with an initial drive controlling portion that learns the relationship between encoder count values, rotor position, and energized phase during an initial drive, and an initial drive prohibiting portion that prevents repeated initial drives until a predetermined time has elapsed after the initial drive is completed, ensuring continuous power supply until the prohibition period is met.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the initial drive is repeatedly performed due to frequent on-off usage, then the motor can be activated and controlled, but the motor temperature rises unexpectedly and the motor may be damaged
Solution Approach 1:
The control device performs preliminary learning of the relationship between encoder count values, rotor positions, and energized phases during the initial drive. This learned information is stored and reused when the motor is restarted within the prohibition period, eliminating the need to repeat the initial drive and its associated heat generation.
Solution Approach 2:
The control device implements a prohibition period after the initial drive during which repeated initial drives are prevented. This periodic restriction allows the motor to cool down and avoids unnecessary repeated learning cycles, thereby protecting the motor from overheating and damage.
2Measurement precision
If the initial drive is performed to learn the relationship among encoder count value, rotor position and energized phase, then accurate motor control is achieved, but heat is generated and motor temperature rises
Solution Approach 1:
The control device performs the learning of rotor position relationships during the initial drive as a preliminary action. This learned data is then reused for subsequent operations within the prohibition period, eliminating the need to repeat this heat-generating process and allowing the motor to remain cooler.
3Reliability
If power is continuously supplied to prevent repeated initial drives, then motor protection is achieved, but energy is consumed during the prohibition period
Solution Approach 1:
The control device uses the previously learned relationship data stored from the initial drive to self-service subsequent motor control operations within the prohibition period. This allows the motor to be controlled accurately without repeating the initial drive, protecting the motor while minimizing additional energy consumption.
Data Source
AI summary
A motor controlling device includes an encoder to output pulse signals with a predetermined angle interval as a rotor of a motor is rotated. An energized phase of the motor is sequentially switched by detecting a rotation position of the rotor based on a value of counting the signals. An initial drive controlling portion executes an initial drive to switch the energized phase with a predetermined pattern after the device is activated so as to learn a relationship among the count value, the rotation position and the energized phase. An initial drive prohibiting portion prohibits the execution of the initial drive until a predetermined time is elapsed after the initial drive is finished.