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Special Encoder Applications
Gear
Motors
Avtron offers two solutions: |
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Modular encoders mounted between the motor and gearbox. Additional motor
shaft requirements can be as little as 0.83”. |
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Available models:
AV125,
AV850,
M56, M85,
M115 |
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Hollow shaft
encoders on the
non-drive end of the motor. |
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Available models:
AV685,
HS25A,
HS35A,
HS35M, M3-(3-9, A-J),
M4-(3-9, A-J), M6-(4-7),
M7,
M685 |
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Brushless DC Tachometers |
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K661 Brushless
tachometer
shown with M3-1
Solid Shaft Encoder. |
If you have
analog tachogenerators like the GE BC-42 and BC-46 or the Reliance
Electric RE-210 you probably want to upgrade them without the need to change your drives
to accept frequency inputs. These analog tachs are DC Generators that put out voltage
signals at 50, 100, or 200 VDC per 1000 RPM. If you are in this situation, Avtron has a
solution. You can install an Avtron
encoder on the motor in place of the analog tach and
add our Model K661 Brushless
Tachometer in the drive cabinet. The K661 will accept as a
standard, a 240
PPR input. It can handle signals up to 24 KHz, and has a maximum voltage
output of 300 VDC. The K661 has a selectable 50, 100, or 200 VDC per 1000 RPM output at 3
mA. The feedback signal is more stable than the analog tach signals and there are no
brushes to maintain. Speed regulation is improved and routine maintenance is eliminated.
The Avtron Model K662 Brushless
Tachometer can be used for more modern drives that use
a 0-10 VDC. The K660A can be used if you need a 4-20 mA signal.
This method of upgrading goes beyond improved performance. When digital drives are
installed in the future, the Avtron
encoder can be used to feed a frequency signal to the
drive directly, thus maintaining the installation. Only the Brushless Converter is removed
from service for a clean and efficient upgrade path. |
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Roll/Line Shaft |
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There are applications that come up from time to time where an
encoder must be mounted
to the end of a roll or drive shaft rather than on a motor shaft for instrumentation
purposes. The same installation standards apply no matter where the encoder is installed.
If you are mounting an encoder on a roll, the easiest way is to drill and tap the end of
the roll shaft and thread a 1 1/8" x 2" bolt into it. Cut off the hex head and
turn the bolt down to 1". Use an Avtron M3 Mill Duty or M4
Heavy Mill Duty Encoder with a 1"
hollow shaft mount and clamp it in place on the shaft. Using the insulating
hardware that comes with the M3 Mill Duty Encoder, mount a 1/4" rod with a ball and
clevis (looks like a tie rod on both ends, available from Avtron) between the
encoder
anti-rotation bracket and a convenient location on the machine's base. The mounting
arrangement permits the encoder to ride with any end movement of the roll, up to 1"
without affecting performance. |
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Ultra-Low
Temperature Applications |
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Avtron offers a full range of models capable
of operating outdoors in the coldest conditions. Proven on thousands of
oil rigs, wind turbines, mining equipment, and pipelines worldwide.
Models available include:
Modular
Encoders: AV125, AV850,
M56,
M67,
M85,
M115, rated at -40°C.
Hollow Shaft
Encoders:
M4-(3-9, A-J), M6-(4-7),
M685
, rated at -40°C; M7, rated
to -45°C and below.
Solid Shaft Encoders:
M4-(1-2),
M485, rated to -40°C. |
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