|
Vibration plate to achieve the principle of speed
Release time:
2017-06-09 8:03:14 |
|
We all know that the speed of the vibration plate can be adjusted, then the vibration plate is how to adjust the speed of it?
If only the power of the main winding of the vibrating disc is switched on, the motor does not turn, but if the external force is advanced by pushing an external force to rotate in any direction, the main winding
Turn on the power, the motor can be rotated in that direction, even if the removal of external force, the motor can continue to rotate, and can drive a certain mechanical load.
Only in the main winding of the vibrating disc into the single-phase sinusoidal AC, the motor will produce a pulse magnetic field, that is, the location of the magnetic field
And the strength of the magnetic field changes according to sinusoidal law.
If the use of external forces, in a certain direction to promote the rotation, then the rotor bar and the two rotating magnetic field relative to the speed of movement is not equal, so the two
The forward magnetic torque generated by the rotating magnetic field and the reverse electromagnetic torque are not equal, the forward electromagnetic torque is greater than the reverse electromagnetic torque,
Moment is not equal to zero, in this synthetic electromagnetic torque, the rotor is rotating along the direction.
When the motor rotor is stationary, the rotor guide bar and the two rotating magnetic field relative to the speed of the same size, in the opposite direction, so the two rotating magnetic field
In the rotor winding induced in the electromotive force and current equal size, the opposite direction, they were generated by the forward electromagnetic torque and reverse electromagnetic torque
The two electromagnetic torques cancel each other, so the synthetic electromagnetic torque is equal to zero. The vibration plate can not start on its own.
Why does vibration plate have such a feature? Professional pure theoretical knowledge to explain.
The dual-rotation magnetic field theory says that the pulsating magnetic field can be thought of as being composed of two rotating magnetic fields whose magnitude is equal and synchronous
The rotation speed is the same, but the rotation direction is opposite, and the magnetic field which is the same as the rotor rotation direction is called the positive rotation magnetic field, and the magnetic field opposite to the rotor rotation direction
Called the reverse rotation magnetic field, the electromagnetic torque of the vibration disk can be regarded as the result of the electromagnetic torque synthesis produced by the two rotating magnetic fields, respectively. |
|
|
Record: ICP.17021542
