Electrical (dc and ac) Tachometer Generator


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A rotating generator produces a voltage signal proportional to the rotational velocity of the input shaft. A dc generator produces a voltage level proportional to speed, as in Figure 1. Therefore it could be used as a tachometer. A principal requirement is that the output voltage be smooth over the operating range and that the out put be stabilized against temperature variations.

Figure 1

The ac generator produces an ac voltage output with a frequency proportional to rotational speed, as shown in Figure 2 In a simple two-phase motor, the ac voltage is applied to one phase of the motor and the measurement is taken off the other. Typical operating frequencies are 60 Hz and 400 Hz. This carrier frequency should be 5 to 10 times the required frequency response of the ac generator tachometer. The direction of travel is determined by the phase of the signal with opposite directions being 180 out of phase. The basic dc generator is shown in Figure 3.

Figure 2


Figure 3


 Sources of tachometer generators include the Tamagava Sieki Co. ;Magnetic SPA Co. and Johannes Hubner Co.
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GE Company; Kollmorgen Motion Technologies; Sierracin/Magnedyne and Micro Mo Electronics also produce tachometer generators.






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