Motor Control Circuit Adaptive Gain Adjustment
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Solution Overview
Problem
Existing motor control circuits require external microprocessors or multiple integration constant circuits for setting control gains, which become complex and costly when subdividing speed ranges for precise control.
Innovation Solution
A motor control circuit that automatically adjusts speed and phase gains by comparing detection and reference signal periods, using digital counters and gain correction mechanisms to optimize control characteristics without external interfaces or analog circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If external microprocessors or multiple integration constant circuits are used to set control gains, then control precision is improved, but device complexity increases
Solution Approach 1:
The motor control circuit automatically determines optimal control gains through self-diagnosis of motor characteristics without requiring external microprocessors or multiple integration constant circuits. The circuit performs self-adjustment by detecting motor back-EMF and inductance to calculate appropriate PWM duty cycles and current limits, thereby achieving precise control while minimizing device complexity.
Solution Approach 2:
The control circuit dynamically adjusts control parameters including PWM duty cycle, current limit, and integration constants based on detected motor operating conditions. By changing these parameters adaptively rather than using fixed external settings, the circuit achieves precision control with a single integrated structure instead of multiple fixed circuits.
2Measurement precision
If multiple integration constant circuits are provided for different speed ranges, then control precision is improved, but manufacturing cost increases
Solution Approach 1:
A single motor control circuit is designed to handle multiple speed ranges and control functions through adaptive parameter adjustment rather than requiring separate dedicated circuits for each speed range. The circuit universally manages low-speed and high-speed operations, acceleration, deceleration, and positioning by dynamically modifying its control parameters based on real-time motor state detection.
Solution Approach 2:
The control circuit transitions from static fixed gain circuits to dynamic adaptive control where integration constants and PWM duty cycles are continuously adjusted based on detected motor characteristics and operating conditions. This dynamic approach replaces multiple fixed-speed circuits with one adaptable circuit, reducing manufacturing complexity and cost.
3Measurement precision
If speed ranges are subdivided for precise control, then control precision is improved, but the number of integration constant circuits increases
Solution Approach 1:
Instead of using multiple static integration constant circuits for different speed ranges, the invention employs a single dynamic control circuit that automatically adjusts its integration constants and control parameters based on detected motor operating conditions. The circuit dynamically switches between control modes for different speed ranges through parameter adaptation rather than physical circuit multiplication.
Solution Approach 2:
The control circuit performs self-diagnosis of motor characteristics and automatically determines appropriate control parameters for the current operating range without requiring external control signals or multiple pre-configured circuits. This self-adjusting capability eliminates the need for subdivided circuits while maintaining precision control across all speed ranges.
Data Source
AI summary
To provide a motor control circuit that variably controls the speed of a motor, in which an appropriate control gain corresponding to the speed of the motor that is set can be automatically set. The motor control circuit includes a period error signal output means, a speed error signal output means and a gain correction means.