# ANSI/IEEE tachometric dynamo symbol

Canonical URL: https://eloragrid.ai/symbols/ansi-tachometric-dynamo
Publisher: Elora Grid
Updated: 2026-10-28
Lookup label: TG
Drawing use: Schematic
Reference families: IEEE / ANSI, Manufacturer

## Symbol convention

Convention: IEEE / ANSI
Form: Autodesk IEEE-oriented Instrumentation and Sensors form: Tachometric Dynamo
Autodesk publishes this block under its IEEE Symbol Preview. The counterpart is the matching functional concept in the library; no equivalence of every detailed standard graphic is asserted.
Related representation: [Tachometric dynamo](https://eloragrid.ai/symbols/iec-tachometric-dynamo)

IEEE-library tacho-generator form: a small machine on the shaft that produces a voltage proportional to speed.

## In plain English

### What does ANSI/IEEE tachometric dynamo mean?

A tachometric dynamo is a small generator coupled to the machine shaft whose output voltage rises with speed. It appears in older drive, governor and speed-indication schematics, with its output wired to a tachometer, speed relay or drive feedback input.

### A simple example

The symbol does not say whether the output is DC with polarity indicating direction, or AC with frequency and voltage both varying. Volts per 1000 rpm and ripple are key to the receiving input and come from the machine data.

### What the drawings help you do

Check whether output polarity is used to detect direction. Read the volts-per-speed constant from the data sheet. A tachometric dynamo generates a speed signal; a pulse (impulse) pickup produces pulses that must be counted.

### This particular reference

IEEE-library tacho-generator form: a small machine on the shaft that produces a voltage proportional to speed. A tachometric dynamo generates a speed signal; a pulse (impulse) pickup produces pulses that must be counted.

### Terms

- DC: Direct current: electricity flowing in one direction.
- AC: Alternating current: electricity whose direction changes periodically.
- Coil: A wound conductor that can produce a magnetic field when energised.

Concept diagram: Identify the device and form → Read the connections and state → Check the equipment reference
A guide to reading this reference. The original symbol illustration and its drawing notes appear below; these boxes are not a wiring diagram.

- [Autodesk IEEE Symbol Preview — Instrumentation and Sensors](https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-F44D5059-4728-40BD-B9BA-0DE7CFDFAACF.htm)
- [IEEE/ANSI 315-1975: graphic symbols for electrical and electronics diagrams](https://standards.ieee.org/ieee/315/515/)


## What it represents

A tachometric dynamo is a small generator coupled to the machine shaft whose output voltage rises with speed. It appears in older drive, governor and speed-indication schematics, with its output wired to a tachometer, speed relay or drive feedback input.
The symbol does not say whether the output is DC with polarity indicating direction, or AC with frequency and voltage both varying. Volts per 1000 rpm and ripple are key to the receiving input and come from the machine data.

## How to read it

- Check whether output polarity is used to detect direction.
- Read the volts-per-speed constant from the data sheet.

## Information to show or reference

- State output constant
- Show polarity or phase
- Reference the receiving input

## Important distinction

A tachometric dynamo generates a speed signal; a pulse (impulse) pickup produces pulses that must be counted.

## Facts

- Convention evidence: Autodesk IEEE Symbol Preview, Instrumentation and Sensors
- Public vendor block name: HIN1B11 / VIN1B11 (Autodesk identifier; not an IEEE symbol number)
- Output: Voltage proportional to shaft speed
- Artwork scope: Original functional illustration; exact standard glyph and compliance are not certified

## Public references

- [Autodesk IEEE Symbol Preview — Instrumentation and Sensors](https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-F44D5059-4728-40BD-B9BA-0DE7CFDFAACF.htm) — Autodesk. Public IEEE-oriented Instrumentation and Sensors preview listing the Tachometric Dynamo block and its vendor identifier.
- [IEEE/ANSI 315-1975: graphic symbols for electrical and electronics diagrams](https://standards.ieee.org/ieee/315/515/) — IEEE Standards Association. Graphic-symbol standards context and official status; not a source of reproduced artwork.

## Graphic scope

Independent original educational concept illustration by Elora Grid. Not a certified standards graphic or manufacturer footprint. Unitless; not to scale. Original artwork licence: https://creativecommons.org/licenses/by/4.0/. Publisher material is linked only.