Application Showcase: Integrated Motor Solution in Laser Marking Machine
Traceability and regulatory compliance measures often require a permanent marking solution for barcodes, serial numbers and manufacturer info. Mecco Marking and Traceability (https://www.mecco.com) manufactures laser marking machines customized to meet …
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Four Quadrant Drives: Torque Mode continued
In our last posting we introduced torque motors and posed the question about how we might be able to modify our new “Hybrid” drive to act like a torque motor. Have you thought of a way to do it? Great! You’re getting stepper theory down pat. Let’s see …
Four Quadrant Drives Part the Third: Torque Mode
Our last few posting introduced a number of improvements to our original stepper drive so we renamed it a “Hybrid” drive. This “Hybrid” drive operates in all four quadrants without missing any steps and without stalling. Think about that for a minute. …
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Four Quadrant Drives Part the Second: Hybrid Drives
Our last posting introduced the idea of four quadrant drives. Four quadrant drives allow the motor to generate torque in the same direction or in the opposite direction that the shaft is spinning. If the motor is operating in the first or third quadran …
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Four Quadrant Drives
Our last posting we introduced the idea of “position make up.” The idea is that we’re using the 1.1 full step rotor-stator lag information and making a choice as to whether or not the drive will send all the steps it has received to the stator. If it d …
LMD Ethernet at PackExpo 2013
Brian Taylor, Field Applications Engineer at Novanta IMS discusses the Liberty* MDrive Ethernet integrated motor+driver+controller with multiple networking protocols available. The demo shown uses the LMD Ethernet products with PLCs from: Siemens (Prof …
Rotor/Stator Relationship and Lead/Lag
We left off last time with a new “Hybrid” drive that controls the magnitude of the motor’s current based on how large the rotor lagged behind the commanded step position.The larger the lag the more current is pumped into the winding to try to keep it f …
Motor Lead/Lag and Variable Current Control, Part the Second
In our last blog I was about to call my local garage and make an appointment to have the 100,000 mile checkup which includes an oil change and replacement of the timing belt, among other things. The “motion control engine” experts there recommended tha …
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Motor Lead/Lag and Variable Current Control
Our last posting had us choosing a 3 amp motor that produce 75 oz-in of torque at 3000 FS/Sec. We chose to reduce the torque spec by 20 % to take into account the motor-to-motor manufacturing variations and then de-rated it from 60 oz-in (at 3 amps.) O …
Motor Stalls in Stepper Systems
In our last posting we established a number of good things about stepper motors and their controls: Small changes in the winding current can be controlled by using bipolar chopper drive. Torque is in a fairly linear relationship with the winding curren …
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