2STOBER Drives Inc. • ComTrac2012 • www.stober.com
Advantages:
You're probably already aware of the many common-sense
advantages offered by traction-type adjustable speed drives like
the ComTrac drive. When compared to mechanical belt-type, or
electrical adjustable speed drives, traction type drives offer:
• Often, a lower initial cost.
• Few worries about motor overheating during low speed
operation.
• No motor brushes to replace.
• Very compact and lightweight when compared to other me-
chanical drives.
• Simple design with few rotating components to wear or re-
place.
• Easily serviced by semiskilled personnel
• Low maintenance – doesn't need to be cycled through its
speed range to prevent component damage.
• 2 year warranty–your assurance of satisfactory product perfor-
mance.
Features:
Drive cone – The drive cone is made from ductile iron and is
precision ground for long service life. It contains inner air cham-
bers for efficient heat dissipation. It is independently supported by
a shielded bearing mounted into the motor adapter/slide – not just
by the motor bearing.
Traction ring – ComTrac's self-lubrication traction ring is made
from a proprietary material that provides exceptional resistance
to wear and high temperatures. When replacement is necessary,
only the ring and not the entire friction ring mounting flange is
replaced.
Speed adjustment – ComTrac's rack and pinion speed adjust-
ment system features stainless steel components to resist cor-
rosion and is dust resistant by design. The stainless steel pinion
shaft and ductile iron rack are designed to provide assured speed
adjustments in the wettest, dirtiest environments.
Handwheel control – Handwheel control with a position indicator
is standard on every ComTrac drive. Remote speed controls and
overspeed protection is also available.
All ComTrac drives are shipped with the handwheel positioned
on the left as viewed from the output shaft end of the drive. The
handwheel can be quickly and easily moved to the right side by
using the tools and instructions included with the drive.
Mounting position – ComTrac drives can be mounted in virtually
any position.
NEMA C-face input – All ComTrac drives feature a NEMA C-
face input – that means standard off-the-shelf motors, available
locally. ComTrac's patented corrosion resistant collet clamp ring
makes motor shaft attachment fast and simple. The proper hex
wrenches are included with each unit in the motor access cover.
When the motor must be replaced, it can be done easily and
quickly without disassembly of the entire drive.
In addition, the 0F unit is standard with a NEMA C-face output
flange. It enables you to add adjustable speed capability to new or
existing applications.
Torque compensator – The torque compensator assembly fea-
tures high-capacity cylindrical roller bearings – not needle bear-
ings – for long life and quiet operation. The design allows speed
changes during operation or while the drive is at rest. The load
compensating cams precisely match the pressure between the
drive cone and the traction ring in proportion to the load torque.
Cast iron housing – High tensile strength cast iron housing for
long service life in demanding applications.
Stainless steel nameplate.
Two year warranty – Every ComTrac unit is backed by a two-
year warranty.
Delivery – ComTrac units are shipped in 3 days or less.
Selection:
In general, proper selection of a ComTrac drive is as easy as the
drive is to operate.
1. Establish the maximum horsepower required by the driven
machine at maximum speed.
2. Select the drive which meets or exceeds the maximum HP
rating of the driven machine at maximum speed.
Part No. Example:
TD47 0 F K182 W
Traction Drive Model/Size
0– Non-geared
F– Flange Mount
Input for NEMA Frame Size (182TC)
Washdown/Severe Duty (Option)
Speed Control Made Simple!
ComTrac®Adjustable Speed Drives
