Servo Amplifier Control for Motor Unit Exchange
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing component mounter drive systems require system power to be cut to the servo amplifier during motor unit exchanges, leading to increased complexity, cost, and reduced productivity due to the need for restarting the system after the exchange.
Innovation Solution
A control device is used to maintain system power on for the servo amplifier while switching it to a servo off state during motor unit exchanges, allowing for initialization of the encoder and subsequent return to a servo on state, eliminating the need for power-cutting circuits and reducing exchange time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If system power is cut to the servo amplifier during motor unit exchange, then reliability of encoder detection information is maintained, but device complexity increases and productivity decreases
Solution Approach 1:
The invention changes the operational state parameters of the servo amplifier by introducing a servo off state that decouples the feedback control function from the power supply state. This allows the amplifier to remain powered on while disabling servo control, enabling motor unit exchange without power cycling and simplifying the circuit configuration while maintaining encoder reliability.
Solution Approach 2:
The invention makes the servo amplifier's operational state dynamic by allowing transition between servo on and servo off states during operation. The control device can switch the amplifier to servo off state before motor unit exchange and return to servo on state after exchange, providing flexible adaptation without requiring physical circuit changes or power cycling.
2Reliability
If system power is cut to the servo amplifier during motor unit exchange, then encoder detection information reliability is maintained, but productivity decreases due to restart time
Solution Approach 1:
The invention changes the operational state parameters of the servo amplifier by introducing a servo off state that decouples the feedback control function from the power supply state. This allows the amplifier to remain powered on while disabling servo control, enabling motor unit exchange without power cycling and simplifying the circuit configuration while maintaining encoder reliability.
Solution Approach 2:
The control device performs preliminary action by switching the servo amplifier to servo off state before the motor unit exchange begins. This preparation ensures that the amplifier is ready to accept the new motor unit without requiring power cycling, and after exchange, the amplifier can be returned to servo on state immediately, eliminating restart delays and improving productivity.
3Reliability
If drive circuit is added to cut system power to servo amplifier, then motor unit exchange reliability is improved, but device complexity and cost increase
Solution Approach 1:
The invention changes the operational state parameters of the servo amplifier by introducing a servo off state that decouples the feedback control function from the power supply state. This allows the amplifier to remain powered on while disabling servo control, enabling motor unit exchange without power cycling and simplifying the circuit configuration while maintaining encoder reliability.
Solution Approach 2:
The invention replaces the mechanical/power-based solution (drive circuit to cut power) with a control-based solution (servo off state controlled by control device). Instead of using physical power switching circuits, the system uses software/control logic to disable servo feedback control while maintaining power supply, thereby reducing hardware complexity and cost while achieving the same reliability goal.
Data Source
Figure 1
Figure 2
AI summary
With respect to servo amplifiers (14) attached to a component mounter 10, a motor unit (11) of at least one of the multiple motor units (11), for example a motor unit (11) of a drive mechanism assembled on a mounting head, is attached to be exchangeable. A control device (27) of the component mounter switches the servo amplifier (14) from a servo on state to a servo off state before exchange of the motor unit (11), maintains servo amplifier (14) system power in an on state, initializes an encoder (13) of the motor unit (11) connected to the servo amplifier (14) after the motor unit (11) has been exchanged, and returns the servo amplifier (14) to a servo on state. By this, the servo motor (12) of the exchange motor unit (11) achieves a state in which feedback control can be performed based on detection information of the encoder (13), and operation of the exchanged motor unit (11) can be started.