Special Encoder Applications

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Special Encoder Applications

Gear Motors

Brushless DC Tachometers

Roll/Line Shaft

Ultra-Low Temperature Applications

Gear Motors Avtron offers two solutions:	^ Back to Top
	Modular encoders mounted between the motor and gearbox. Additional motor shaft requirements can be as little as 0.83�.
	Available models: AV125, AV850, M56, M85, M115
	Hollow shaft encoders on the non-drive end of the motor.
	Available models: AV685, HS25A, HS35A, HS35M, M3-(3-9, A-J), M4-(3-9, A-J), M6-(4-7), M7, M685

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.

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.

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.