Analog tachometers (tacho dynamos, DC tacho generators), briefly called „tachos" deliver output voltage in proportion to speed. The output voltage is generated in the form of regenerative energy, reason why tachos do not require any auxiliary power. Tachos offer high signal dynamics combined with robustness.
In drive technology, tachos acquire the currently present speed, for example at
Brochure – Selection Guide Encoders and angle measurement
Brochure – Product Overview – Encoders and angle measurement