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Polynoids

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image of Polynoids, a type of linear motor
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The AC polynoid is an electrically operated, open loop AC linear induction motor that provides a constant force over its entire stroke.  It can run directly off of 115 / 230 VAC line voltage or with an adjustable frequency drive.  Its direction of travel is reversible by switching 2 of the 3 leads.   

 

A polynoid is made up of two basic parts, a rod and a stator.  The stator is a series of interconnected coils that are housed in a toothed steel assembly that is available with fins for improved heat dissipation.  An optional holding coil is available for end holding at one or both ends.  The rod is a custom copper clad steel shaft, with tapped mounting holes.  The rod can be supplied in any length.

 

Polynoid linear actuators are ideal replacements for air cylinders, and can be used to actuate electrical switch gears, for diverting products on conveyer belts.

 

·         Forces to 445 N [100 Lbs]

·         Acceleration to 9.8 m/s2 [1g]

·         Speeds to 2.3 m/s [90 in/sec]

·         Optional built-in electronic brake (holding coil) for end holding

·         Integral rulon bearings

·         Low cost, powered by AC line voltage or adjustable speed with an inverter

·         Provides long stroke with uniform force

·         Stroke limited by end stops on moving rod

·         Limited duty cycle applications

·         Virtually maintenance free

·         Single or 3-phase AC line voltage, 50 or 60 Hz (Single-phase requires use of external capacitor)


polynoids Product number Chart


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polynoids assembly
polynoid holding position
Polynoid
Finned SeriesSmooth Series
Coils A in [mm] B in [mm] Weight. LBS [kg] Coils A in [mm] Weight. LBS [kg]
2 2.124 ± .051 [54.2 ± 1.3] 3.499 ± .040 [88.9 ± 1.0] 1.7 [0.77] 2 2.124 ± .051 [54.2 ± 1.3] 0.85 [0.39]
3 2.514 ± .056 [63.9 ± 1.4] 3.879 ± .045 [98 .5 ± 1.1] 1.9 [0.86] 3 2.514 ± .056 [63.9 ± 1.4] 0.86 [0.39]
4 3.085 ± .071 [78.4 ± 1.8] 4.450 ± .060 [113.0 ± 1.5] 2.5 [1.1] 4 3.085 ± .071 [78.4 ± 1.8] 1.39 [0.631]
6 4.060 ± .091 [103.1 ± 2.3] 5.425 ± .080 [137.8 ± 2.0] 3.2 [1.5] 6 4.060 ± .091 [103.1 ± 2.3] 1.94 [0.88]
8 5.035 ± .111 [127.9 ± 2.8] 6.400 ± .100 [162.6 ± 2.5] 4.2 [1.9] 8 5.035 ± .111 [127.9 ± 2.8] 2.50 [1.14]
9 5.045 ± .101 [128.1 ± 2.6] 6.410 ± .090 [162.8 ± 2.3] 4.0 [1.8] 9 5.045 ± .101 [128.1 ± 2.6] 2.20 [1.0]
12 6.986 ± .151 [177.4 ± 3.8] 8.351 ± .140 [211.2 ± 3.6] 5.8 [2.6] 12 6.986 ± .151 [177.4 ± 3.8] 3.60 [1.64]
24 13.125 ± .271 [333.4±6.8] 14.802 ± .160 [376.0 ± 4.1] 12.8 [5.8] 24
Polynoid Rods
Length Catalog Number
inch mm
4 101.6 LTPY001-073
6152.4LTPY001-064
8203.2LTPY001-066
9228.6LTPY001-067
10254.0LTPY001-070
12304.8LTPY001-068
18457.2LTPY001-074
24609.2LTPY001-075
36 914.4 LTPY001-076
48 1219.2 LTPY001-077
60 1524.00 LTPY001-078
72 1828.8 LTPY001-079
Capacitors for Single-Phase Units
Capacitor Code Number Capacitor Rating
mFd Type
C1 10 165V C
C2 43-53 330V E
C3 189-227 165V E
C4 3 370V C
C5 10 330V C
C6 88-108 330V E
C7 64-77 330V E
C8 21-25 330V E
C9 30-36 330V E
C10 4 370V C

Polynoid Capacitor Connection:
The Polynoid leads should be connected to the capacitor and AC input. Refer to diagram below.

Depending on which end of the capacitor is connected to the AC Line, the polynoid will move in one direction of the other

Black Wire = AC Neutral
Red Wire = One side of the capacitor
White Wire = One side of the capacitor