In single phase squirrel cage motors, the primary winding within the motor housing is not capable of starting a rotational motion on the rotor, but is capable of sustaining one. To start the motor, a secondary "start" winding has a series non-polarized starting capacitor to introduce a lead in the sinusoidal current. When the secondary (start) winding is placed at an angle with respect to the primary (run) winding, a rotating electric field is created. The force of the rotational field is not constant, but is sufficient to start the rotor spinning. When the rotor comes close to operating speed, a centrifugal switch (or current-sensitive relay in series with the main winding) disconnects the capacitor. The start capacitor is typically mounted to the side of the motor housing. These are called capacitor-start motors, that have relatively high starting torque. Typically they can have up-to four times as much starting torque than a split-phase motor and are used on applications such as compressors, pressure washers and any small device requiring high starting torques.
In single phase squirrel cage motors , the primary winding within the motor housing is not capable of starting a rotational motion on the rotor , but is capable of sustaining one . To start the motor , a secondary " start " winding has a series non - polarized starting capacitor to introduce a lead in the sinusoidal current . When the secondary ( start ) winding is placed at an angle with respect to the primary ( run ) winding , a rotating electric field is created . The force of the rotational field is not constant , but is sufficient to start the rotor spinning . When the rotor comes close to operating speed , a centrifugal switch ( or current - sensitive relay in series with the main winding ) disconnects the capacitor . The start capacitor is typically mounted to the side of the motor housing . These are called capacitor - start motors , that have relatively high starting torque . Typically they can have up - to four times as much starting torque than a split - phase motor and are used on applications such as compressors , pressure washers and any small device requiring high starting torques .
What does the centrifugal switch do the capacitor when the rotor achieves operating speed?
What does the centrifugal switch do the capacitor when the rotor achieves operating speed ?
disconnects the capacitor
disconnects the capacitor