Motor Gain Switching for Rapid Speed Stabilization
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Solution Overview
Problem
Existing motor controlling devices take a long time to reach target rotational speed due to reduced control amounts when switching to smaller gains, which slows down the stabilization process.
Innovation Solution
An electronic device with a controller that selects a first gain during startup and switches to a second gain when the motor reaches a predetermined speed, using feedback control to quickly stabilize the rotational speed within a defined range, allowing for efficient motor control and image formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a large gain is used during startup feedback control, then the motor reaches target speed faster, but the motor rotation becomes unstable when approaching target speed
Solution Approach 1:
The patent applies dynamics by making the gain value changeable based on motor operating conditions. The controller dynamically switches between a first gain (larger value) during startup and a second gain (smaller value) when approaching target speed, allowing the control system to adapt its characteristics to different operational phases. This resolves the contradiction by enabling fast response when needed while ensuring stability when the motor nears its target.
Solution Approach 2:
The patent changes the control parameter (gain value) based on the motor's rotational speed and operational state. By switching between different gain values depending on whether the motor is in startup phase or approaching target speed, the system optimizes both speed response and rotation stability. This parameter change strategy directly addresses the technical contradiction by adjusting the control characteristic to match the current operational requirements.
2Stability of the object's composition
If a smaller gain is used when approaching target speed, then the motor rotation stabilizes, but the time to reach target speed increases
Solution Approach 1:
The dynamic gain switching strategy allows the system to use a larger gain during startup to minimize the time to reach target speed, then transitions to a smaller gain when approaching the target to ensure stable rotation. This time-varying control approach resolves the contradiction by applying different control strengths at different phases of the motor's acceleration, optimizing both response time and stability.
Solution Approach 2:
The controller preliminarily applies a larger gain during the startup phase to quickly bring the motor close to target speed before switching to a smaller gain for fine-tuning and stabilization. This preliminary aggressive control action reduces the overall time to reach target speed while maintaining stability through the subsequent gain reduction.
3Speed
If feedback control is continuously applied with large gain, then the motor reaches target speed quickly, but the control amount cannot be reduced when close to target speed
Solution Approach 1:
The patent implements dynamic gain adjustment where the controller automatically reduces the control amount by switching from a first gain to a second gain when the motor approaches target speed. This dynamic adaptation makes the control system easier to operate by automatically adjusting the control strength based on the motor's proximity to the target, preventing overshoot and instability without requiring manual intervention.
Solution Approach 2:
The feedback control mechanism continuously monitors the motor's rotational speed and uses this information to determine when to switch between gain values. The feedback signal triggers the gain reduction when the motor is close to target speed, automatically adjusting the control amount to maintain stability. This feedback-driven gain switching resolves the contradiction by linking control amount adjustment to the actual motor state.
Data Source
AI summary
An electronic device includes a motor, a detector, and a controller. The detector detects a rotational speed of the motor. The controller selects a gain from a plurality of gains based on the rotational speed and controls rotation of the motor through feedback control. The controller uses a first gain from startup of the motor until the motor initially reaches a predetermined rotational speed after the startup. The controller switches to a second gain smaller than the first gain when the motor initially reaches the predetermined rotational speed after the startup, and uses the second gain in a predetermined range with respect to the rotational speed. The predetermined range is defined between a lower limit smaller than the predetermined rotational speed and a higher limit larger than the predetermined rotational speed.