Vibration motor When running, the power often fails to reach the rated power and is lost, because the power consumed includes active and reactive power.  

　　Active power is the power required for a vibration motor to generate mechanical torque and drive a load. Its current increases as the load increases. Reactive power is the power consumed when the electric and magnetic fields inside the vibration motor change repeatedly with the frequency of the power source and continuously exchange energy between the load and the power source.  

　　The change of reactive current under load changes is very small. In phase, the change of current always lags behind voltage 90 °, so it is purely inductive. In actual operation, the total current supplied by the power supply to the vibration motor is the vector sum of the active current and the reactive current. When the vibration motor is running at full load, the active current is greater than the reactive current, and the power factor of the total current is higher. When falling, the active current decreases and the reactive current is basically unchanged, so the power factor decreases.  

　　It can be said that when the output power of the vibration motor is fixed, the lower the power factor, the larger the reactive power it needs, and the greater the loss. Practice has proved that the power loss caused by reactive power mainly occurs on transmission and distribution lines. For terminal equipment that is far from the power source, the line resistance r is relatively large, and the vibration motor operates with a low power factor, the reactive power caused by Loss is even more prominent.