Tachsyn Series Brushless DC Tachometer Commutators

Tachsyn Series Brushless DC Tachometer Commutators

Tachsyn Series Brushless DC Tachometers from ServoTek Products are a family of tachometers / commutators. This is a unique type of transducer that can be used as either a brushless dc tachometer and/or as a brushless dc motor commutator. The Tachsyn transducer is a magnetic sensing device in which the output windings, field winding, permanent magnet are all located in the stator, thus maximizing reliability. The very-low-inertia rotor has no windings, but is, instead, contoured with high- and low-reluctance poles.

Tachsyn transducers are available in models to commutate 4-, 6-, 8-pole brushless dc motors. Any size may be used when a simple tachometer signal is all that is required. Pancake-shaped Tachsyn transducers are easily mounted, cantilever-style, to the back of a motor or other device, with synchro-type adjustment for phasing. The Tachsyn tachometers / commutators offers an economical solution to many velocity-loop problems, whether brushless or standard servo.  For technical assistance, or capacities not listed here, please click here.


   

Features:

  • Can be used as a brushless dc tachometer and/or as a brushless dc motor commutator
  • Very-low-inertia rotor has no windings, but is, instead, contoured with high- and low-reluctance poles
  • The CT4 circuit board completes the Tachsyn signal conditioning and may be housed up to 100 feet from the hot-running motor,
    leaving only the non-electronic transducer to take the heat
  • The CT4 circuit provides ac field excitation for the transducer, as well as condition for its output signals
  • Output signals include a linear, low-ripple dc tachometer voltage and either hall-equivalent or sine wave commutation signals
  • Tachsyn transducers are available in models to commutate 4-, 6-, 8-pole brushless dc motors
  • Tachsyn tachometer/commutators offer an economical solution to velocity-loop problems, whether brushless or standard servo
  • Rotor also available for order with Product (please specify -R with model number). If rotor is needed, please consult factory for assistance.

General Information:

  • Each Tachsyn Transducer requires one CT-4 Series circuit board, or customer-built equivalent, connecting cable with double-barreled shield.
  • Standard configurations are normally in stock.
  • Please note: All data supplied here is for reference purposes only.  It should not be used to specify or size Tachsyn products.
    For assistance with sizing and selection, please
    click here to contact the factory.

How to Determine which Circuit Board is Best for your Application:

First, determine the Tachometer output as follows:

  • (Figure in multiplier Column (below)) X (Your Speed in Thousands of RPM) X (Volts/1000 RPM from TACHSYN (below))
  • If, at the top speed, the calculated voltage exceeds bus-1 VDC, then select a lower output multiplier in right column and recalculate. For the best signal-to-ambient-noise ratio in slow speed applications, select the maximum multiplier which will not exceed bus-1 VDC.

CT Diagrams

 

 

 

 

 

 


Tachsyn Transducer Ordering Information

Please click on the part number below order online.


Part Number

Bore

Poles 

Gain

V/1000
Inertia
Moment

Rotor
T4421WAB 0.500″ 4 1.15 1.0 ± 10% 0.94 x 10-4 No
T4421WAB-R  0.500″ 4 1.15 1.0 ± 10% 0.94 x 10-4 Yes
T4421WAC 0.500″ 4 1.00 1.0 ± 10% 0.94 x 10-4 No
T4421WAC-R 0.500″ 4 1.00 1.0 ± 10% 0.94 x 10-4 Yes
T4421WBC 0.250″ 4 1.00 1.0 ± 10% 0.94 x 10-4 No
T4421WBC-R 0.250″ 4 1.00 1.0 ± 10% 0.94 x 10-4 Yes
T5400WAC 0.500″ 4 1.00 1.0 ± 10% 1.59 x 10-4 No
T5400WAC-R 0.500″ 4 1.00 1.0 ± 10% 1.59 x 10-4 Yes
T5400WBC 0.250″ 4 1.00 1.0 ± 10% 1.59 x 10-4 No
T5400WBC-R 0.250″ 4 1.00 1.0 ± 10% 1.59 x 10-4 Yes

Tachsyn Transducer Circuit Boards (Required, Please Select One)

Part Number
Multiplier
Output
CT-405  0.5 Hall Equiv.
CT-410 1.0 Hall Equiv.
CT-415 1.5 Hall Equiv.
CT-425 2.5 Hall Equiv.
CT-440 4.0 Hall Equiv.

Tachsyn Rotor Spares

(Please note, Tachsyn models are available with pre-installed rotor. Please refer to -R designations above).  It is not necessary to order a secondary rotor for -R models.

For Tachsyn T4421 Series:
2933-2
2933-1


For Tachsyn T5400 Series:
2970-2
2970-1