Control method for servomotor in injection molding machine
AssigneeKabushiki Meiki Seisakusho
InventorKeijiro Oka
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Abstract
In a method for controlling a servomotor in an injection molding machine having a servo amplifier which outputs a driving current 16 according to a command signal 15 transmitted from a control device 1 and a servomotor 8 having an encoder 9 which is driven by the driving current 16, the encoder 9 transmits angular displacement data 13, 14 to the encoder 9 according to a request command supplied from the control device 1. The control device transmits a command signal 15 calculated based on the received angular displacement data 14 to the servo amplifier 6.
Claims2
A method for controlling a servomotor in an injection molding machine comprising a servo amplifier which outputs a driving current according to a command signal transmitted from a control device and a servomotor having an encoder which is driven by said driving current, wherein the servo amplifier transmits a request command to the encoder according to a request command supplied from the control device to the servo amplifier;
- the encoder which has received the request command signal transfers said angular displacement data to the servo amplifier and to the control device by serial transmission;
- the servo amplifier and the control device, that have received the angular displacement data convert the received respective serial angular displacement data into parallel angular displacement data;
- the control device calculates a rotating speed based on the parallel angular displacement signal, compares the same with a set speed value and outputs a command signal to the servo amplifier;
- and the servo amplifier controls the servomotor by comparing said command signal with said angular displacement data.
Dependencies are inferred from the claim text.