HIN1B11
Tachometric dynamo
A tachometric dynamo indication identifies a speed-related generating measurement function.
IEC
IEEE / ANSI · TG
ANSI/IEEE tachometric dynamo symbol
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.
- 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.
Read the source: Autodesk IEEE Symbol Preview — Instrumentation and Sensors · IEEE/ANSI 315-1975: graphic symbols for electrical and electronics diagrams
IEEE / ANSI · 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.
Shown as an independently authored educational illustration. Use the cited publication and drawing legend to verify the required drafting form.
Schematic · TG
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
A distinction that matters
A tachometric dynamo generates a speed signal; a pulse (impulse) pickup produces pulses that must be counted.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
Autodesk IEEE Symbol Preview — Instrumentation and Sensors
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
Graphic-symbol standards context and official status; not a source of reproduced artwork.
About this graphic
This illustration was authored independently by Elora Grid to explain the concept. It is not reproduced from a customer drawing, an official standard graphic or a manufacturer CAD file. Its correspondence to an exact IEC or IEEE symbol identifier has not been certified.
SVG and DXF downloads contain this original artwork. DXF uses unscaled drawing units; a GA envelope supplies no product dimensions, clearances or fabrication information. Original artwork is available under CC BY 4.0. Third-party references retain their own terms.
Explore related references
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ANSI/IEEE tachometer symbol
IEEE-library tachometer instrument form showing where machine speed is indicated from a speed transducer.
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ANSI/IEEE impulse tachometric dynamo symbol
IEEE-library impulse tacho form for a speed sensor that outputs pulses at a rate set by shaft speed.
IEEE / ANSI
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