Timeline for Shaded pole motor speed control
Current License: CC BY-SA 3.0
4 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jul 29, 2023 at 12:47 | comment | added | Janka | You can even go further and use double rungs in the squirrel cage, with the outer rung having a much smaller aluminium cross section than the inner one. Because the slip determines the strength of the skin effect in the rotor, such a rotor has a high resistance at low speeds and a low resistance at high speeds which means its characteristic becomes a single curve without the torque hill nor turning points. | |
| Jul 29, 2023 at 12:41 | comment | added | Janka | The squirrel cage is the resistor. The whole point of it is increasing the resistance of the rotor. So the torque/speed-characteristic of the motor is on the right of the hill not as steep as shown in the graphic but about 1:1. That way, lowering the voltage will lower the speed of the drive a lot more than with an almost vertical characteristic. | |
| Jul 29, 2023 at 9:50 | comment | added | rustyx | Good theory, but how do plan to put resistors in the squirrel cage rotor? 99% of the time it's cast aluminium or copper, i.e. a monolith. | |
| Feb 26, 2018 at 20:11 | history | answered | Janka | CC BY-SA 3.0 |