Industrial Engineer · phase 9 of 16 · noun
Motor Nameplate Speed
Rated loaded shaft speed used to estimate slip and improve motor-control accuracy.
The Explain card
- Plain English
- The nameplate speed is how fast the loaded motor actually turns at rated frequency, a little below synchronous speed. The gap is the slip, and the drive uses it to estimate load and compensate.
- Example
- A four pole motor has a synchronous speed of 1800 rpm and a plate that reads 1750. Enter 1750 and the drive knows this motor slips about 50 rpm at full load.
- Why it matters
- A drive told 1800 thinks the motor has no slip and runs vector control on a wrong model, which shows up as poor low speed torque and hunting. Autotune can measure some of this, and the plate is still the place to start.
- Hook
- The plate says what the shaft really does.
Word knowledge
How the word is built, where it came from, and what it sits beside in memory.
In a sentence
During VFD commissioning, enter the Motor Nameplate Speed from the induction motor plate into parameter P1-25 in revolutions per minute.
Why these words
- motor Latin motor, mover, from movere, to move identifies the machine whose information is being referenced
- nameplate English compound of name and plate specifies the physical source of the recorded value
- speed Old English sped, success or quickness serves as the head noun and identifies the measured quantity
Where it came from
- Origin
- English engineering compound formed from motor, nameplate, and speed
- Entered the language
- 20th century
- What changed
- Three established nouns combined into a specialized label used in motor documentation and drive setup.
How it is spelled
- Pattern
- nameplate is written as a closed compound
- Pattern
- speed uses double ee for the long e sound
- Pattern
- motor retains the agent-noun ending -or
Spelled like
- baseplate
- bedplate
- feed
- need
- rotor
- stator
Broken into chunks
-
mot
- motion
- motive
- motorize
-
name
- namesake
- surname
-
plate
- baseplate
- faceplate
-
speed
- speedometer
- overspeed
What it sits beside
Same subject
- synchronous speed
- motor slip
- base frequency
- motor poles
- encoder feedback
Same shape
- motor nameplate voltage
- motor nameplate current
- motor nameplate frequency
Motor nameplate data
- rated voltage
- rated current
- rated frequency
- service factor
Motor speed terms
- synchronous speed
- base speed
- overspeed
Where it sits in the deck
Phase 9: VFD Ratings, Sizing, and Motor Data
Nameplate arithmetic, where the currents, voltages and duty ratings decide whether a drive can actually run the motor you bolted it to.
