DC BRUSHLESS TACHOMETER

DC Brush Tachometer Generator Catalog RC700 Download pdf

tachsyn brushless transducers

A brushless tachometer and commutator

The patented Tachsyn brushless tachometer/commutator is a unique transducer that can be used as a brushless dc tachometer and/or as a brushless dc motor commutator.
The Tachsyn brushless transducer is a magnetic sensing device in which the output windings, field winding, and 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.
A miniature circuit board for complete Tachsyn brushless signal conditioning may be housed up to 100 feet from the hot-running motor, leaving only the non-electronic brushless and bearingless transducer to take the heat. The CT-4 circuit board is available for purchase, or may be customer-built from a Servo-Tek schematic, without charge for major OEM customers.
The CT-4 circuit provides ac field excitation for the brushless transducer, as well as conditioning for its output signals. These signals include a linear, low-ripple brushless dc tachometer voltage and either Hall-equivalent or sinewave commutation signals.
Tachsyn brushless transducers are available in models to commutate 4-, 6-, or 8-pole brushless dc motors. Any size may be used when a simple brushless tachometer signal is all that is required .
Pancake-shaped brushless Tachsyn transducers are easily mounted, cantilever-style, to the back of a motor or other device, with synchro-type adjustment for phasing. The brushless Tachsyn is bearingless.
Tachsyn brushless tachometer/commutators offer an economical solution to many velocity-loop problems, whether brushless or standard servo.

Tachsyn brushless tachometer/commutator

*Units normally in stock.

Tachsyn® is a registered trademark of Servo-Tek Products Company, Inc.

Control Schematic - Tachsyn brushless tachometer/commutator

General Specifications with CT-4

Brushless Tachometer Output

Ripple volts, p-p

+/- 2%

Volts/1 000 rpm

1 to 6.8 (to bus-l)

Linearity

+/- 0.1%

Minimum load resistance

1O k ohms

Commutation Output from the Tachsyn brushless tachometer/commutator

Format

3-phase: Hall-equivalent or sinewave

Poles

4, 6, or 8

Output impedance

1000 ohms

Power Supply for the Tachsyn brushless tachometer/commutator

Volts, dc

+/-11.5 to +/-16

Amps, maximum

0.075

Download detailed literature about the Tachsyn brushless tachometer/commutator pdf.