PTZ Camera Gimbal Motor Control Circuit for Positioning Error Elimination
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Solution Overview
Problem
The gimbal system in pan-tilt-zoom (PTZ) cameras experiences increasing rotation errors due to friction and idling issues, leading to inaccurate positioning and potential damage from continuous rotation beyond the limiting structure, as the motor cannot perceive when it has reached the limiting position.
Innovation Solution
A control circuit comprising a motor drive circuit, monitoring circuit, gimbal motor, and microprocessor that acquires and processes signals to determine the in-place status of the gimbal motor, allowing for precise control and correction of the gimbal's operating state to prevent continuous rotation and heat generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a limiting structure is arranged on the camera to prevent the monitoring device from rotating more than 360 degrees, then the cable from being pulled apart is prevented, but the gimbal motor cannot perceive when it reaches the limiting position and continues to rotate, causing friction and idling between the rotor and stator
Solution Approach 1:
The patent applies feedback by using a monitoring circuit to detect the operational state of the gimbal motor and provide this information back to the control circuit. The control circuit adjusts the motor's operation based on this feedback, enabling precise control and preventing continuous rotation beyond the limiting position. This resolves the contradiction by allowing the system to both prevent cable damage and accurately perceive the limiting position.
Solution Approach 2:
The patent replaces the purely mechanical limiting structure with an integrated electrical control system. Instead of relying solely on mechanical constraints, the system uses electrical signals from the monitoring circuit to control the motor's operation. This substitution enables precise position perception and control while maintaining the physical limiting structure for cable protection.
2Device complexity
If the gimbal motor continues to rotate without detecting the limiting position, then the mechanical structure can be simple, but the rotation error continuously increases due to friction and idling
Solution Approach 1:
The monitoring circuit provides continuous feedback on the gimbal motor's operational state, including current consumption and operational phase information. The control circuit uses this feedback to detect when the motor is in friction or idling states and adjusts operation accordingly, maintaining high rotation accuracy without requiring overly complex mechanical precision components.
Solution Approach 2:
The system uses the gimbal motor's own operational characteristics (current consumption, operational phase) as detected by the monitoring circuit to automatically adjust its operation. This self-service approach allows the system to maintain high precision by detecting and correcting friction and idling issues without external intervention or complex additional sensing mechanisms.
3Use of energy by moving object
If the gimbal motor operates without precise position control, then the system is simpler and consumes less power, but the deviation caused by back-and-forth rotation accumulates and prevents accurate positioning
Solution Approach 1:
The monitoring circuit continuously monitors the gimbal motor's operational state and provides feedback to the control circuit. This feedback enables the system to detect when the motor reaches the limiting position and when friction or idling occurs, allowing for precise positioning control. The system only consumes additional power when necessary for correction, rather than continuously operating at high power.
Solution Approach 2:
The system uses periodic monitoring of the gimbal motor's operational state through the monitoring circuit. By periodically detecting current consumption and operational phase, the control circuit can identify accumulated deviations and implement corrective actions at appropriate intervals, maintaining positioning accuracy without requiring continuous high-power operation.
Data Source
AI summary
This application discloses a control circuit of a PTZ camera and control method. The control circuit includes: a motor drive circuit, a monitoring circuit, a gimbal motor, and a microprocessor. The motor drive circuit, the gimbal motor, and the microprocessor are electrically connected to the monitoring circuit respectively. The gimbal motor is configured to drive a rotor of the camera to rotate. The monitoring circuit is configured to acquire a first signal between the motor drive circuit and the gimbal motor, and output a second signal to the microprocessor according to the first signal. The microprocessor is configured to obtain an in-place status of the gimbal motor according to the second signal. The motor drive circuit is configured to control an operating state of the gimbal motor according to the in-place status. As a result, the deviation caused by back-and-forth rotation of the gimbal motor can be eliminated in time.