High-speed slip ringsLegacy
Moog PM Series high-speed slip ring
High-speed capsule slip ring rated to 12,000 rpm in 8 to 24 circuit builds; listed as legacy.
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Moog lists this series as legacy. We can help with spares for installed machines, a migration to the replacement, or an alternative. Find a replacement.
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Need Moog parts, a replacement or another suitable option? Send your part number or describe what the machine needs to do. We connect your requirement with experienced UK engineering and procurement support to help you get the right products, pricing and supply options. Your matched provider can take the enquiry through quotation and ordering to delivery and after-sales support.
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Select everything you need. A motor, drive and gearbox can be specified together as one axis.
Key specifications
| Circuits (max) | 24 |
|---|---|
| Current per circuit (max) | 2.5 A |
| Voltage (max) | 50 V |
| Speed (max) | 12,000 rpm |
| Outer diameter | 90.4–90.4 mm |
Summarised in our own words from Moog Inc.'s published data; series maxima, individual models vary. Last checked 2026-10-29. Source 1 · Source 2 · Source 3
Notes on this data
Dimensions converted from published inches. Guide lists 8/12/14 circuits; catalogue part 80027-950 lists 24.
Specify Motion is not affiliated with Moog Inc.. Moog and PM Series are used only to identify the product. Comparisons use published figures; always confirm against the current datasheet.
Moog PM Series replacement and alternative options
Use these supply-network options as a starting point for an engineering check. We can also help source the original Moog part. Published series figures do not establish an exact-model or drop-in replacement: confirm ratings, fit, interfaces and approvals for your application.
Slip rings built for 800 to 15,000 rpm, mainly used on test rigs and non-destructive testing equipment.
| Published maximum | PM Series | High Speed Slip Ring |
|---|---|---|
| Circuits | 24 | — |
| Current per circuit | 2.5 A | — |
| Speed | 12,000 rpm | 15,000 rpm meets or exceeds |
| Voltage | 50 V | — |
Figures are the highest published for each series and are not always measured the same way. A higher figure is not automatically a better choice: mounting, duty cycle, feedback, connectors and approvals matter too. An engineer will check the fit against your application before recommending anything.
Typical applications
What a high-speed slip ring is
A high-speed slip ring is a rotary joint built to run at speeds well above general industrial units, typically from a few thousand to over ten thousand rpm. To manage heat and wear, designers keep ring diameters small, use precisely balanced rotors and high-precision bearings, and select brush materials and contact forces for the higher surface speed. Some designs use liquid or forced-air cooling. Most high-speed units carry low-level signals such as strain gauges and thermocouples, with limited power circuits.
When engineers choose a high-speed slip ring
Choose a high-speed design for test rigs, spindles, centrifuges, turbines and tyre or wheel testing where the rotating sensors spin far faster than a normal slip ring allows. The trade-offs are circuit count, current and life: speed limits how big the rings can be, and brush wear rises with surface speed, so service intervals may be shorter. For very high data rates at speed, telemetry or contactless transfer may be an alternative. Balance and runout of the mounting shaft are critical.
How to specify the Moog PM Series
Send these with your enquiry and an engineer can confirm the right PM Series variant or an equivalent:
- Maximum and continuous speed (rpm)
- Duty: continuous running or short test runs
- Number and type of signal circuits, such as strain gauge, thermocouple or encoder
- Acceptable electrical noise (mΩ or µV)
- Power circuits and current (A)
- Shaft or bore interface and permissible runout (mm)
- Cooling, lubrication and expected service interval (h)
Common mistakes to avoid
- Mounting on a shaft with runout that the slip ring bearings cannot tolerate at speed
- Quoting peak test speed but not how long the rig runs there
- Using standard thermocouple wire through the rings and creating junction errors
- Forgetting the slip ring's own drag torque and inertia in rig calculations
Moog PM Series: frequently asked questions
Can you help replace Moog PM Series or source the original?
Send the full model code, quantity and required date. Our engineers can check original-part availability and assess suitable alternatives, including supply-network options where appropriate. We confirm compatibility and any changes needed before recommending a replacement.
What is the Moog PM Series?
High-speed capsule slip ring rated to 12,000 rpm in 8 to 24 circuit builds; listed as legacy. Published series figures include circuits 24, current per circuit 2.5 A, voltage 50 V, speed 12,000 rpm. It is made by Moog Inc.; Specify Motion can help source it or propose an equivalent.
Who makes the Moog PM Series?
The Moog PM Series is made by Moog (Moog Inc.) and is listed here for engineers comparing options. Specify Motion is not affiliated with Moog Inc.; brand names are used only to identify the product.
What is the circuits of the Moog PM Series?
The published series maximum circuits is 24. Individual models and sizes in the PM Series range vary, so check the exact variant against your duty cycle, mounting and environment, or ask our engineers to confirm the right size for you.
Is the Moog PM Series still available?
Moog lists the PM Series as legacy. We can help with spares for installed machines, a migration, or an equivalent from our supply network that meets the same published figures.
How fast can a slip ring rotate?
General industrial slip rings are typically rated to a few hundred rpm, while dedicated high-speed designs commonly reach several thousand to over ten thousand rpm. The practical limit depends on ring diameter, because surface speed sets brush wear and heat. Small-diameter capsules reach the highest speeds, while large-bore units are rated lower. Always check both maximum speed and continuous rating.
Can strain gauge signals pass through a slip ring cleanly?
Yes, when the rings use low-noise precious-metal contacts and the circuits are allocated well. Use dedicated rings for each bridge connection, keep them away from power, and consider amplifying or digitising on the rotor where noise is critical. Contact resistance variation is the main noise source, so state the acceptable level and the expected speed.
Further reading: How to select a slip ring · How to specify a slip ring · Slip rings
Other high-speed slip rings series
Engineer support
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Tell us how you use the Moog PM Series: the load, speed, duty and environment. Our engineers will confirm whether it is still the right part, find it for you, or propose an alternative that fits better.
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