Precision Rotary Table Application Solution

 
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Precision Rotary Table Application Solution

PUSIROBOT Nema17 closed loop integrated stepper
CANopen/RS485 bus · multi-turn absolute encoder · IP64 protection · power-loss position memory

Closed loop control No step lose IP64 Dust and splash proof Absolute encoder Power-loss memory 14 bit Multi-turn absolute position -40~80°C Wide temp. range

Ever run into these issues?

The table jerks on start/stop and runs unstable

Vibration is obvious during indexing, and the whole motion feels rough.

Position is lost on power‑off, so you have to re‑home every time

Restarting means wasting time finding the home position, dragging out cycle times.

Lost steps trigger equipment pauses or full stops

With open‑loop steppers, once a step is missed, all downstream stations go out of alignment – and maintenance costs climb.

The table is small, but the control hardware takes up too much space

Driver, controller, encoder cabling – making installation a headache.

💡

Root causes?①Open‑loop stepper control + a distributed system architecture. ②Motion control algorithms that can’t keep up.
The fix: integrate drive, control, encoder, and communication right into the motor body, and add closed‑loop feedback with precise control algorithms – that solves it all.

Nema17 closed loop integrated stepper

PUSIROBOT closed‑Loop stepper – integrates the stepper motor, absolute encoder, PMC006 series drive/controller, and CAN/RS485 bus communication into a standard 42mm×42mm motor flange, with IP64 water‑ and dust‑proof rating.
英2
Power supply voltage
DC 12-48V
Power supply voltage
DC 12-48V
Encoder
4000ppr incremental/ 14bit absolute
Encoder
4000ppr incremental/ 14bit absolute
Protection
IP64 (Aviation sealed)
Protection
IP64 (Aviation sealed)

Micro step
2/4/8/16/32/64/128 adjustable

Micro step
2/4/8/16/32/64/128 adjustable

Four Core Advantages

① Closed‑loop control – no lost steps

Built‑in incremental encoder (4000 PPR) or 14‑bit multi‑turn absolute encoder continuously monitors the rotor position and compares it with the commanded position. Any deviation is instantly corrected, fundamentally eliminating step loss. This all‑in‑one closed‑loop stepper achieves servo‑class positioning accuracy at a fraction of the servo cost.

② Multi‑turn absolute encoder – position retained after power‑off

With the 14‑bit multi‑turn absolute encoder, absolute position data is always stored. After power‑loss, unexpected stop, or emergency stop, the system restarts with the exact position known – no re‑homing required. For multi‑station indexing tables, that means production can resume immediately, saving significant auxiliary time.

③ PP (Positioning Profile) mode – smooth motion and fast settling

Supports adjustable acceleration/deceleration profiles – start speed, stop speed, acceleration, and deceleration are all independently configurable. In PP mode, you can update the next motion parameters on the fly, enabling seamless transitions without stopping. For continuous multi‑station indexing, the speed profile is smooth and impact‑free, and settling time is greatly shortened.

④ IP64 protection – rugged in harsh environments

Sealed aviation connectors and enclosed construction provide IP64 water‑ and dust‑proof rating, plus a wide temperature range from ‑40°C to 80°C. Whether in coolant‑splashed machining cells, dusty assembly lines, or laboratory chambers with thermal cycling, the table operates reliably.

System Connection Diagram

英3

Solution comparison

Feature Traditional Open‑Loop 42 All‑in‑One Closed‑Loop
Step‑loss detection ✕ Not detectable ✔ Real‑time closed‑loop compensation
Position after power‑off ✕ Lost – requires re‑homing ✔ Absolute encoder retains position – ready to go
Footprint Separate driver + controller + encoder ✔ Fully integrated into the motor body
Wiring count Pulse + direction + encoder + power ≈ 10+ wires ✔ Bus (2‑wire) + power (2‑wire) = 4 wires
Protection rating Usually unprotected ✔ IP64
Control modes Typically position‑only ✔ Position / Speed / PP / PV / Analog / Synchronisation
Multi‑axis networking Requires a separate multi‑axis controller ✔ Direct connection via CAN bus, up to 120 nodes

Selection Guide

Motor length Holding torque Phase current Weight
33mm 0.25 N·m 1.2A 0.32 kg
40mm 0.36 N·m 1.5A 0.36 kg
47mm 0.45 N·m 1.6A 0.42 kg
60mm 0.65 N·m 1.6A 0.52 kg
💡

Need higher torque? PUSIROBOT also offers 57mm and 86mm closed‑loop all‑in‑one units, with holding torque from 1.05 to 8.7 N·m – ideal for medium‑to‑large precision rotary tables.

Application Scenarios

4‑Station Indexing Assembly Turntable

Four 42 all‑in‑one units, each driving one station, networked via CAN bus. Absolute encoders eliminate re‑homing.
Repeat positioning accuracy: ±0.02°.

Optical Inspection Rotating Stage

Single 42 all‑in‑one with closed‑loop encoder, running constant‑speed scanning. S‑curve acceleration/deceleration ensures zero vibration, so image quality meets specifications.

Laboratory Auto‑Sampling Turntable

Compact 42mm form factor mounts directly under the benchtop unit. Multi‑turn absolute encoder means no re‑homing at each power‑on – experiments run uninterrupted.

CNC Small 4th Axis

IP64 protection withstands coolant splash and chips. Wide temperature range from ‑40°C to 80°C ensures reliable operation even in harsh shop‑floor conditions.
英4

Product Feature Summary

FeatureValue
Closed‑loop control with encoder feedbackEliminates step loss, delivers precise positioning
14‑bit multi‑turn absolute encoderRetains position after power‑off – no re‑homing, ready on power‑up
S‑curve acceleration/deceleration + PP modeSmooth, jolt‑free start/stop; short settling time
IP64 protection + aviation connectorsWater‑ and dust‑proof, survives harsh machining environments
Full integration of drive/control/encoderMinimises installation footprint; wiring reduced to just 4 wires
CANopen / Modbus bus supportEasy networking, up to 120 nodes, distributed control
‑40°C ~ +80°C wide temperature rangeStable operation in thermal‑cycling environments
20000+ hours durabilityLowers maintenance frequency and total cost of ownership
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