Difference between revisions of "Servo motor"

Revision as of 05:17, 13 October 2010

A servo motor is usually comprised of the drive section and the encoder. A servo motor is much smoother in motion than a comparable stepper motor, and will have a much higher resolution for position control. While the servo family is further divided into AC and DC types, most all the servos we use are brushed DC.

On the servo's shaft are magnets, attached at specific locations. Sequences and combinations of magnetic fields generated within the motor drive the magnets and give precise control over the shaft's rotation. Also on the servo’s shaft is a glass disc with very fine lines on it. The optical encoder counts those lines as it rotates with the motor, the information is fed back to the controller, and through a host of feedback loops and logic circuits, produces the desired motion.

Servo Part Numbers

The following part numbers note some common Dynetic Systems servos used in Techno CNC routers:

Servos for: LC+, RG 4896/5050, 59120, 78120

X/Y Motor Assembly - HZ2600M0670607

• (motor H50R10-067 / encoder H90Z46-SRV90C-1)

Z-Axis Motor Assembly - HZ2600M0670617

• (motor H50R11-067 / encoder H90Z46-SRV90D-1)

Servos for: LC 4896; 5050; 59120

X/Y Motor Assembly - HZ2600M0243600-L

• (motor H50R11-0243 / encoder H90Z46-SRV90C-1)

Z-Axis Motor Assembly - HZ2600M0243610-L (for LC and also for Servo Davinci)

• (motor H50R11-0243 / encoder H90Z46-SRV90D-1)

Servos for: PC 6050

X/Y Motor Assembly - ?????????????

• (motor H50M30-3485M4463 / encoder H90Z46-SRV90C-1)

Z-Axis Motor Assembly - HZ2600M067B617

• (motor H50M30-3485B4475 / encoder H90Z46-SRV90D-1)

Other Servo motors

• LP, LC, 3A X/Y Motor = HZ2600M0243600-L
• MP LC 4.5A X/Y Motor = HZ2600M1050XY3-L
• HP LC+ 5.1A X/Y Motor = HZ2600M0670607
• PC Brushless X/Y Motor = HZ2600M067B607B
• PC Brushless Z Motor = HZ2600M067B617B

Servo Cables

X/Y cable

• (servo cable HX1700M1016-CE = 16 foot, both cables)

• (servo cable HX1700M1025-CE = 25 foot, both cables)

• (servo cable set HX1700M1025-CEX = 20 foot)

• 15.5' Motor/Encoder Cable HX1700M1015.5-CE
• 15.5' Motor/Encoder Cable HX1700M1015.5-LC
• 16' Motor/Encoder Cable HX1700M1016-CE both cables
• 20' Motor/Encoder Cable HX1700M1020-CE
• 25' Motor/Encoder Cable HX1700M1025-CE both cables
• 31' Motor/Encoder Cable HX1700M1031-CE
• 35' Motor/Encoder Cable HX1700M1035-CE

Limit/Home Switches

A Limit switch, also known as Home switch, is a normally closed switch. This means that the switch, under ordinary circumstances, is closed and allowing current to flow and the servos to move. When a servo travels in such a manner so that it contacts the switch, the switch opens and current to the servo is cut off, stopping the servo.