SERVO-TEK ® SERVO-TEK PRODUCTS COMPANY, INC. DC Tachometer Generators www.servotek.com RC-700 rev. 2 SERVO-TEK ® 1086 Goffle Road • Hawthorne, NJ 07506 • [email protected] Phone (973) 427-3100 • Fax (973) 427-4249 • www.servotek.com Technical Data An Industry Standard for over fifty years. A Servo-Tek DC tachometer generator provides a convenient and economical means of converting rotational speed into an isolated analog voltage signal suitable for remote indication and control. While this catalog contains information on our most popular models, we also manufacture countless special tach generators. Construction Most of our DC tach generators are housed in aluminum casings protected in accordance with Mil-C-5541 or Mil-A-8625 or high performance plastics. Alnico permanent magnets are used. Armature shafts are stainless-steel, and rotate on fully shielded stainless-steel ball bearings. Commutators are manufactured from an alloy containing at least 90% silver. Armature laminations are wound with Isomid insulated wire, over Teflon slot insulation. The entire armature is then baked, resulting in a NEMA Class H insulation system. Linearity Linearity at any speed is better than 0.1% of the output at that RPM. Bidirectional Operation All Servo-Tek tachometer 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. SB-740A-2 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 tachometer generators are factory tested with an AC potential of 1250 volts RMS applied for one second between (either) terminal and shaft. E-Series units are tested with 500 volts. DA-7533A-2 Ripple The ripple RMS value will not exceed 3% of the DC value at any speed in excess of 40 RPM on standard units. On the low ripple units, the ripple RMS value will not exceed 1.5% of the DC value. A peak to peak ripple of 1.5% is available on some models. Temperature Range Most of our DC tachometer generators are designed for continuous operation in ambient temperatures ranging from -55ºC to +100ºC. Voltage output at 25ºC will not deviate by more than 0.01% per degree of change within the range of -20ºC to +75ºC. All units are temperature compensated, with the exception of D-Series and E-Series tach generators. SERVO-TEK 1086 Goffle Road • Hawthorne, NJ 07506 • [email protected] Phone (973) 427-3100 • Fax (973) 427-4249 • www.servotek.com ® A-Series B-Series 1 to 10 volts/1000 RPM 11 to 24 volts/1000 RPM SB-757B-1 and SU-7346B-1 SA-757A-2 and SA-740A-2 SN-763A-2 A-Series Tachometer Generators B-Series Tachometer Generators Instrument Type: • 0.120 inch shaft diameter • Small in size • Ideally suited to instrumentation applications As is the case with the A-Series DC tachometer generator, the B-Series also comes in instrument and industrial configurations. Depending on the unit, the output voltage ranges between 11 and 24 V/1000 RPM. Electrical characteristics, ripple, linearity and temperature effects are the same as the A-Series. Industrial Type: • 0.187 inch shaft diameter • Special front-end bearings for radial loads • Ideal for pulley and belt drive applications Other shaft sizes and mounting configurations are available for most Servo-Tek generators. A-Series and B-Series Specifications Inertia (Approx.) oz-in-sec2 V/1000 RPM RPM (max) Armature Resistance (dynamic) Armature Inductance (henrys) Outline Dimensions Mounting Dimensions Shaft Size (in.) Model Number Mounting Weight (Approx.) SA-740A-7 Face 3.0 oz 1.32 x 10-4 2.6v 12,000 40Ω 0.024h Fig. 10 Fig. 1 .120 SB-740A-7 Flange 3.0 oz 1.32 x 10-4 2.6v 12,000 40Ω 0.024h Fig. 10 Fig. 2 .120 SA-740A-2 Face 3.0 oz 1.32 x 10 -4 7.0v 12,000 350Ω 0.18h Fig. 10 Fig. 1 .120 SB-740A-2 Flange 3.0 oz 1.32 x 10-4 7.0v 12,000 350Ω 0.18h Fig. 10 Fig. 2 .120 SA-757A-2 Face 3.0 oz 1.32 x 10 -4 7.0v 12,000 350Ω 0.18h Fig. 11 Fig. 1 .187 SB-757A-2 Flange 3.0 oz 1.32 x 10-4 7.0v 12,000 350Ω 0.18h Fig. 11 Fig. 2 .187 SA-740B-1 Face 4.0 oz 2.27 x 10 20.8v 8,000 1000Ω 0.56h Fig. 10 Fig. 1 .120 SB-740B-1 Flange 4.0 oz 2.27 x 10-4 20.8v 8,000 1000Ω 0.56h Fig. 10 Fig. 2 .120 SA-757B-1 Face 4.0 oz 2.27 x 10 20.8v 8,000 1000Ω 0.56h Fig. 11 Fig. 1 .187 SB-757B-1 Flange 4.0 oz 2.27 x 10-4 20.8v 8,000 1000Ω 0.56h Fig. 11 Fig. 2 .187 -4 -4 Maximum Driving Torque for A-Series and B-Series is 0.25 oz-in Most units listed above are normally in stock SERVO-TEK ® 1086 Goffle Road • Hawthorne, NJ 07506 • [email protected] Phone (973) 427-3100 • Fax (973) 427-4249 • www.servotek.com D-Series E-Series (Subminiature) SU-780D-1 SS-779E-1 25 to 50 volts/1000 RPM .7 to 3 volts/1000 RPM D-Series Tachometer Generators With rugged construction and high output voltages, the D-Series tach generator is ideally suited to a variety of industrial applications. The flange mounting arrangement provides a convenient assembly method, and the sturdy .187 shaft diameter permits the heavier loading frequently encountered where pulleys or belt drives are employed. The output bearing is fitted with a seal to help prevent the contamination that can occur in industrial applications. With output up to 50V/1000 RPM, D-Series generators are ideal for applications where high output voltages are required. Typically, these are slow speed applications. E-Series Tachometer Generators The E-Series DC tachometer generator is the smallest tach generator among those offering similar technical characteristics. Many outstanding features make it particularly suitable for use in all types of servo systems. Although the diameter is only 0.760” the E-Series provides up to 3 V/1000 RPM output. Almost any Servo-Tek DC tachometer generator can be manufactured with special configurations, various electrical specs and shaft modifications such as flats, pinions, holes, etc. Consult sales department regarding your special requirements. D-Series and E-Series Specifications Inertia (Approx.) oz-in-sec2 V/1000 RPM RPM (max) Armature Resistance (dynamic) Armature Inductance (henrys) Outline Dimensions Mounting Dimensions Shaft Size (in.) Model Number Mounting Weight (Approx.) SU-780D-1 Flange 8.5 oz 4.54 x 10-4 45v 5,000 1750Ω 1.00h Fig. 10 Fig. 5 .187 SU-7114D-1 Flange 8.5 oz 4.54 x 10-4 45v 5,000 1750Ω 1.00h Fig. 10 Fig. 5 .187 SU-780D-2 Flange 8.5 oz 4.54 x 10-4 33v 5,000 950Ω 0.54h Fig. 10 Fig. 5 .187 Synchro 1.25 oz 0.25 x 10-4 3v 12,000 180Ω 0.061h Fig. 12 Fig. 6 .120 SS-779E-1 Maximum Driving Torque for D-Series and E-Series is 0.25 oz-in Most units listed above are normally in stock SERVO-TEK 1086 Goffle Road • Hawthorne, NJ 07506 • [email protected] Phone (973) 427-3100 • Fax (973) 427-4249 • www.servotek.com ® Low Ripple Units (F-Series, H-Series and J-Series) 1 to 30 volts/1000 RPM CS-7514F-51C and SA-7356F-1 SB-7483H-1 F-Series (1-8 volts/1000 RPM) Servo-Tek low ripple DC tachometer generators satisfy the need for a cost effective, very low ripple tachometer. In addition to being the first economical low ripple units of their type, the F-Series tachometers incorporate all the desirable features of the standard units such as temperature compensation, long brush life, excellent linearity, and small dimensions. The ripple voltage does not exceed 1.5% RMS and 3.5% peak to peak at any speed in excess of 40 RPM on any F-Series, H-Series or J-Series DC tachometer generator. H-Series (5-16 volts/1000 RPM) The H-Series DC tachometer generators are low ripple units possessing all the same traits as the F-Series, but with the B-length armature. This means a slightly higher output voltage. J-Series (16-30 volts/1000 RPM) The J-Series DC tachometer generators are low ripple units possessing all the same traits as the F-Series, but with the D-length armature. These generators are ideal for applications where high output voltages with low ripple signals are required. Other shaft sizes and mounting configurations are available. F-Series, H-Series and J-Series Specifications Model Number Mounting Weight (Approx.) SA-7356F-1 Face SA-7388F-1 Face CS-7514F-51C Flange Inertia (Approx.) oz-in-sec2 Armature Resistance (dynamic) Armature Inductance (henrys) Outline Dimensions Mounting Dimensions Shaft Size (in.) V/1000 RPM RPM (max) 3.0 oz 1.14 x 10 -4 7.0v ± 3% 12,000 500Ω 0.38h Fig. 10 Fig. 1 .120 3.0 oz 1.32 x 10-4 7.0v ± 3% 12,000 500Ω 0.38h Fig. 10 Fig. 1 .187 3.0 oz 1.32 x 10 3.0v ± 3% 12,000 130Ω 0.061h Fig. 11 Fig. 3 .250 -4 SB-7483H-1 Flange 4.0 oz 1.96 x 10-4 16.0v ± 3% 8,000 800Ω 0.72h Fig. 11 Fig. 2 .187 SU-780J-1 Flange 8.5 oz 4.54 x 10-4 5,000 1050Ω 1.00h Fig. 10 Fig. 5 .187 30v ± 1% Maximum Driving Torque for F-Series, H-Series and J-Series is 0.25 oz-in at 25ºC Most units listed above are normally in stock SERVO-TEK 1086 Goffle Road • Hawthorne, NJ 07506 • [email protected] Phone (973) 427-3100 • Fax (973) 427-4249 • www.servotek.com ® Sealed DC Tachometers Servo-Tek’s Ruggedized ST-7337A-2N and ST-7337B-1 ST-13212 and ST-12970 1 to 45 volts/1000 RPM Sealed Tachometer Generators Servo-Tek manufactures a complete line of sealed units which are resistant against the harmful effects of fluids. These units employ a one-piece housing, a special shaft seal, and a form-fitted rubber boot on the terminal end. Servo-Tek sealed units meet electrical specifications after storage at 49ºC with 95% relative humidity for 24 hours. These units are capable of enduring vibration with amplitudes up to 0.03” total excursion at frequencies from 4 Hz to 55 Hz in each of three mutually perpendicular axes with no evidence of physical damage. These units are available with a low ripple output up to 30V/1000 RPM. PY Alternative (Up to 50 volts) Ruggedized Tachometer Generators Servo-Tek ruggedized DC tachometer generators are designed with sturdy aluminum housings and strong mounting flanges. Other features offered include extra-heavy armature shafts and bearings. The mechanical flexibility of the ST-13212 allows for the internal tachometer to be repaired or replaced, without having to replace the expensive anodized casting. The ST-13212 supplies outputs from 2.6 to 50V/1000 RPM and runs at speeds up to 5000 RPM. The shaft size is 5/16” in diameter. The ST-12970 comes equipped with a rubber coupling. It allows the unit to be driven by a motor shaft with 0.167” wide slot. The ST-12970 is also available with outputs up to 24V/1000 RPM and can run at high speeds. Sealed DC Tachometer Generator Specifications Inertia (Approx.) oz-in-sec2 V/1000 RPM RPM (max) Armature Resistance (dynamic) Armature Inductance (henrys) Outline Dimensions Mounting Dimensions Shaft Size (in.) Model Number Mounting Weight (Approx.) ST-7336A-7 Face 3.0 oz 1.32 x 10-4 2.6v 12,000 40Ω 0.024h Fig. 8 Fig. 8 .120 ST-7336A-2 Face 3.0 oz 1.32 x 10-4 7.0v 12,000 350Ω 0.18h Fig. 8 Fig. 8 .120 ST-7336B-1 Face 4.0 oz 2.27 x 10 20.8v 8,000 1000Ω 0.56h Fig. 8 Fig. 8 .120 ST-7337A-2 Face 3.0 oz 1.32 x 10-4 7.0v 12,000 350Ω 0.18h Fig. 8 Fig. 8 .187 ST-7337B-1 Face 4.0 oz 2.27 x 10 20.8v 8,000 1000Ω 0.56h Fig. 8 Fig. 8 .187 SU-7346D-1 Flange 8.5 oz 4.54 x 10-4 45v 5,000 1750Ω 1.00h Fig. 8 Fig. 5 .187 -4 -4 Maximum Driving Torque for a sealed DC tachometer generator is 0.7 oz-in Most units listed above are normally in stock SERVO-TEK 1086 Goffle Road • Hawthorne, NJ 07506 • [email protected] Phone (973) 427-3100 • Fax (973) 427-4249 • www.servotek.com ® Overhung Tachometer 1 to 24 volts/1000 RPM ST-7565 Series Introducing Servo-Tek’s new low-cost overhung tachometer. This bearingless tach-generator is small in size and has a black delrin housing and end plate. Because the Servo-Tek overhung unit is self-generating and provides an analog output, it makes for an excellent alternative to the encoder. No D-A conversion will be necessary! Mounts easily using a 10-32 threaded shaft. No coupling or mounting brackets will be required. ST-7565A-2 Part Number: ST-7565A-2 Output Voltage: Internal Resistance: Ripple: Linearity: Bidirectional Output: Polarity: Temperature Coefficient: 7 VDC ± 5%, no load, per 1000 RPM at 25ºC 270 Ohms typical at 25ºC 5% RMS of DC output voltage at speeds over 40 RPM 0.1% max., 0 to 4000 RPM 0.5% of nominal output in both CW and CCW directions Red wire positive with CCW rotation viewing shaft end 0.05% per ºC of nominal output at 25ºC from -20ºC to 50ºC Accessories Other Products ST50 Optical Encoder Rubber Couplings ST-9502 ST-9502-1 fits .120 shafts and ST-9502-2 fits .187 shafts. The tapered tang is molded to fit a straight slot 0.167”±.005” wide and 3/16” deep. ST50 ST20 Optical Encoder Flexible Couplings ST-9776 ST-9776 fits shaft diameters of up to .375 shafts. They may be ordered in any mixed or matched configuration. When ordering, please specify both hole sizes. The ST50, a 2 inch hollow shaft encoder, accepts motor shafts from .236 to .625 inches OD. It combines 3 phase brushless commutation pulses, 2 data channels and reference index pulse in a single package. ST20 Request a Servo-Tek RC-800 catalog for our complete product line of encoders. The ST20, a 2 inch shaft encoder, is a low cost, heavy duty solution to digital feedback. This unit is available in single or dual channel with nearly unlimited mounting patterns. Mounting and Outline Dimensions Figure 1 SA Face Mount Figure 2 SB Flange Mount Figure 3 SD Modified Synchro Figure 4 SM Aircraft Mount Figure 5 SU Large Flange Mount Figure 6 SS Synchro Mount Figure 7 Aircraft Configuration Figure 8 Sealed Configuration Figure 9 Flat Shaft Configuration Model # “L” SM-762A 2.520 SM-762B 2.957 Figure 10 Instrument/Industrial Configuration Model “L” “F” “P” “N” “S” Model “L” “E” “F” “N” ST-7336A 1.867 OMIT OMIT OMIT 0.120 ± .001 XX-7114B 2.193 0.562 0.437 0.157 0.187 ± .001 ST-7336B 2.304 OMIT OMIT OMIT 0.120 ± .001 XX-7114D 3.253 0.562 0.437 0.157 0.187 ± .001 ST-7337A 1.875 0.375 0.062 0.157 0.187 ± .001 XX-7146A 1.701 0.562 0.437 0.110 0.120 ± .001 ST-7337B 2.312 0.375 0.062 0.157 0.187 ± .001 XX-7346D 3.633 0.375 0.062 0.157 0.187 ± .001 Figure 11 Industrial Configuration “S” Figure 12 E-Series Tachometers Model # “L” “F” “P” “N” “S” Model # “L” “F” “P” “N” Model # “T” “L” “E” “S” XX-740A 1.701 OMIT OMIT OMIT 0.120 ± .001 XX-757A 2.240 0.375 0.062 0.157 SS-779E 1.687 1.479 0.375 ± .015 0.1200 ± .0005 XX-740B 2.138 OMIT OMIT OMIT 0.120 ± .001 XX-757B 2.677 0.375 0.062 0.157 SS-7251E 1.687 1.479 0.562 ± .015 0.1870 ± .0002 XX-780B 2.193 0.375 0.062 0.157 0.187 ± .001 XX-796B 2.677 OMIT OMIT OMIT XX-780D 3.253 0.375 0.062 0.157 0.187 ± .001 XX-7483H 2.677 0.375 0.062 0.157 XX-797A 1.701 0.187 0.187 0.110 0.120 ± .001 XX-7103A 1.756 0.375 0.062 0.157 0.187 ± .001 XX-7107D 3.253 OMIT OMIT OMIT 0.187 ± .001 XX-7123A 1.756 OMIT OMIT OMIT 0.187 ± .001 XX-7123B 2.193 OMIT OMIT OMIT 0.187 ± .001 XX-7356F 1.701 OMIT OMIT OMIT 0.120 ± .001 XX-7360F 1.756 0.375 0.062 0.157 0.187 ± .001 Servo-Tek Products Company • 1086 Goffle Road • Hawthorne, NJ 07506 Phone (973) 427-3100 • Fax (973) 427-4249 • www.servotek.com Specifications subject to change without notice Copyright © 2003 Servo-Tek Products Company