Stepping Motor Control Device for Smooth Acceleration
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Solution Overview
Problem
Existing control methods for stepping motors face challenges in smoothly accelerating and decelerating while maintaining a dynamic range, particularly at high speeds, due to issues with advance angle control and voltage management.
Innovation Solution
A control device that includes a processor to generate detection signals, detect rotation speed and advance angle, and switch between control states to adjust advance angle and voltage, using stored data to calculate target advance angles and control the stepping motor's rotation speed, ensuring smooth acceleration and deceleration across a dynamic range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If advance angle control is used to rotate the stepping motor at high speed, then the stepping motor can avoid step-out and rotate at higher speeds, but it becomes difficult to smoothly accelerate and decelerate while ensuring a dynamic range
Solution Approach 1:
The patent applies dynamics by making the control parameters (advance angle and voltage) variable rather than fixed. The control device dynamically adjusts the advance angle and voltage based on the current rotation speed and acceleration/deceleration requirements. This allows the system to adapt to different operating conditions, enabling smooth acceleration and deceleration while maintaining high-speed rotation capability without step-out.
Solution Approach 2:
The patent changes the control parameters (advance angle and voltage) based on the operating state. By storing multiple loci indicating relationships between advance angle and rotation speed at different driving voltages, and selecting appropriate loci based on current conditions, the system can smoothly transition between different speed ranges and maintain optimal control throughout the dynamic range.
2Device complexity
If voltage control is used to set target rotation speed with fixed advance angle, then control is simplified, but the dynamic range of rotation speed is limited
Solution Approach 1:
The patent segments the control space by storing multiple loci that represent different relationships between advance angle and rotation speed at different driving voltages. Each locus corresponds to a specific voltage level, and the control device selects the appropriate locus based on current operating conditions. This segmentation allows the system to maintain simple control logic within each segment while achieving a wide overall dynamic range by switching between segments.
Data Source
AI summary
A control device includes at least one processor which functions as an advance angle detection unit, a storage unit configured to store information indicating a plurality of loci each indicating a relationship between the advance angle and a rotation speed of a rotor at each driving voltage, a target advance angle calculation unit configured to calculate a target advance angle based on the information, an advance angle control unit, a voltage control unit, and a switching unit configured to switch between a first control state for setting a target rotation speed by controlling the advance angle along one locus among the plurality of loci and a second control state for setting the target rotation speed by controlling the voltage in a state where the advance angle is fixed, according to the locus, the target advance angle, and the driving voltage.