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Servo-Tek tachometer generators (also caleed tach generators) provide a convenient means of converting rotational speed into an isolated analog voltage signal suitable for remote indication and control applications.
Combining high accuracy with low driving torque, Servo-Tek tach generators are ideal for use in servo systems.
Tach Generators are particularly suited to application in precision integrators and velocity servos, both of which require a highly linear speed/voltage relationship with minimum ripple.
DC Tachometer Generators are also excellent rate generators for velocity damping in position servos. The nearly pure dc output-with no phase shift-allows Servo-Tek Tach Generators to be used as feedback transducers for numerous types of equipment, including fast-response servos and other devices.
Servo-Tek Tach Generators are housed in aluminum casings protected in accordance with Mil-C-5541 or Mil-A-8625. Alnico permanent magnets are used. Armature shafts are stainless steel, and rotate on fully-shielded stainless steel ball bearings. Commutators are made from an alloy containing 95% silver. Armature laminations are wound with Isomid insulated wire, over Teflon slot insulation. The entire armature is impregnated and baked, resulting in a NEMA Class H insulation system.
Servo-Tek Tachometer Features
Brush Life: Tachometer Generator brushes and commutators are matched for long life and stability. Operation at 1 mA output will deliver maximum brush life.
Linearity: Linearity, of Servo-Tek DC Tach Generators, at any speed is better than 0.1% of the output at that rpm.
Ripple: The DC Tachometer Generator ripple rms value will not exceed 3% of the dc value at any speed in excess of 40 rpm on standard units; 1.5% on low-ripple models.
Bidirectional Operation: All Servo-Tek DC Tach Generators operate in either rotational direction. That direction can be determined by output voltage polarity. Output (in either direction) is held to a tolerance of 0.25% of the average output.
Stability: Optimum brush and commutator combination gives 0.1% stability. Highly stable output gives no evidence of long-term drift.
Breakdown Voltage: Servo-Tek DC Tach Generators are factory tested with an ac potential of 1,250 volts rms applied for one second between (either) terminal and the shaft.
Temperature Range: Tachometer Generators are designed for continuous operation in ambient temperatures ranging from -55°C to +100°C(-67°F to +212°F). Voltage output at 25°C will not deviate by more than 0.01% per degree of change within the range of -20°C to +75°C. All Tachs are temperature compensated, except for Series D and E.
Servo-Tek Series Datasheets
A Series - DC Tachometers with output signal between 1 and 10 volts/1000 rpm.
B Series - DC Tachometers with output signal between 11 and 24 volts/1000 rpm.
D Series - DC Tachometers with output signal between 25 and 50 volts/1000 rpm.
E Series - DC Tachometers with output signal between 0.7 and 3 volts/1000 rpm.
F Series – Low ripple DC tachometers with output signal between 1 and 8 volts/1000 rpm.
H Series - Low ripple DC tachometers with output signal between 5 and 16 volts/1000 rpm.
J Series - Low ripple DC tachometers with output signal between 16 and 30 volts/1000 rpm.
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