Timeline for Initial direction of a motor
Current License: CC BY-SA 4.0
7 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jan 27, 2021 at 15:12 | vote | accept | KMC | ||
| Jan 27, 2021 at 14:05 | comment | added | Andy aka | @KevinWhite amended to suit a hypothetical rotor with two quadrature coils. | |
| Jan 27, 2021 at 14:04 | history | edited | Andy aka | CC BY-SA 4.0 |
added 18 characters in body
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| Jan 27, 2021 at 0:21 | comment | added | Andy aka | It rotates initially in the correct direction because the brushes and the commutator positions only allow current to flow in the winding that creates the correct rotation for the applied electrical polarity. | |
| Jan 26, 2021 at 21:48 | comment | added | KMC | I edited my question to emphasize on what what I'm questioning. I understand why the rotor rotates or why switching polarity keeps it going in a particular direction - but I don't see how a CCW or CW rotation can be "chosen" electromagnetically if without some external mechanical interference. I showed a 3-coil motor as @KevinWhite pointed out for simplification. | |
| Jan 26, 2021 at 18:07 | comment | added | Kevin White | Typically small motors have three commutator segments, not four, with three coils wired in a delta fashion. Even if they have more they will usually be an odd number with 5 being another common number of poles of the armature. The stator will usually have two poles. | |
| Jan 26, 2021 at 12:05 | history | answered | Andy aka | CC BY-SA 4.0 |