Servo Motor Drive Circuit for Continuous 3D Printer Motion
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Solution Overview
Problem
Existing 3D printing systems face discontinuity in accelerated and decelerated motion due to software interruptions required to change the frequency of the output drive signal for servo motors, affecting the stability and continuity of motion.
Innovation Solution
A servo motor drive circuit comprising a motion controller, timer, and comparing units that autonomously change the frequency of the output drive signal, ensuring precise control of the duty ratio and reducing software intervention, thereby enhancing the continuity and stability of the servo motor's acceleration and deceleration phases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If software intervention is used to change frequency of output drive signal, then frequency control is achieved, but motion continuity is disrupted
Solution Approach 1:
The drive circuit autonomously changes the frequency of the output drive signal through its internal timer and comparing units, eliminating the need for software intervention. The circuit self-regulates the pulse period based on acceleration and deceleration requirements, ensuring continuous motion without software interruptions.
Solution Approach 2:
The patent replaces the software-based frequency control mechanism with a hardware-based drive circuit that directly controls the servo motor. This substitution of control architecture eliminates the discontinuity caused by software interruptions while maintaining precise frequency control capability.
2Ease of operation
If software control is used for servo motor, then motion control is achieved, but system stability is reduced
Solution Approach 1:
The drive circuit independently manages frequency changes and duty ratio control through its internal timer and comparing units, reducing dependency on software control. This self-service capability enhances system stability by eliminating software-related interruptions and delays.
Solution Approach 2:
The patent introduces a dedicated drive circuit as an intermediary between the control system and servo motor. This intermediary handles frequency and duty ratio adjustments, isolating the main control system from direct involvement in frequency changes and thereby improving overall system stability.
3Speed
If frequency change is performed during acceleration phase, then speed adjustment is achieved, but motion discontinuity occurs
Solution Approach 1:
The drive circuit ensures continuous frequency adjustment during acceleration and deceleration phases by using its internal timer to generate smooth transitions. The autonomous control mechanism maintains uninterrupted motion while achieving the required speed changes, eliminating discontinuity in the accelerated motion.
Solution Approach 2:
The patent implements dynamic frequency adjustment capability within the drive circuit, allowing real-time changes in pulse period based on acceleration and deceleration requirements. This dynamic control ensures smooth speed transitions without disrupting the continuity of motion.
Data Source
AI summary
The present application provides a servo motor drive circuit and a 3D printing apparatus, a motion controller is configured to send a drive enable signal to the timer; a pulse period providing unit is configured to send a pulse period value to the timer and the first comparing unit at beginning of each pulse period; the timer is configured to perform initialization in response to the received pulse period value during enabling of the drive enable signal, perform cyclic timing by taking the pulse period value as a timing period, and send a timing duration to the first comparing unit; and the first comparing unit is configured to acquire current level information that satisfies a preset duty ratio according to the preset duty ratio, the pulse period value, and the timing duration, and send a drive signal to a servo motor according to the current level information.