What's the difference between a three-phase asynchronous motor and an ordinary one?
Torque motor: it is a kind of special motor with soft mechanical characteristics and wide speed range. The shaft of the motor does not output power at constant power, but outputs power at constant torque. The torque motor includes: DC torque motor, AC torque motor and brushless DC torque motor. Difference: the torque motor is designed to reduce the speed without changing the output torque. When the power supply voltage is decreased, the motor speed drops, but the output force distance is constant, and the current is constant. Ordinary motors can not be slowed down by depressurization, which causes the output torque to decrease while the current increases and the motor is burned out. For inverter control: to confirm the torque of the motor is controlled by AC asynchronous motor or synchronous motor, because the inverter is used in AC motor; also confirmed that the locked rotor current is greater than or equal to the maximum current of inverter torque motor, torque motor can work because in the blocking state.
Ordinary motor motor and variable frequency motor of variable frequency motor, it is called the main appearance is different from the ordinary motor frequency conversion motor with forced cooling centrifugal fan, which ensures good motor cooling in low frequency and high frequency, frequency range also see nameplate motor internal structure can adapt to the specific operation of high frequency operation. Ordinary motors are generally allowed to operate under or less than 50hz.
The three-phase asynchronous motor cooling fan is fixed on the shaft of the motor of the same, and the rotation speed of the motor, low frequency operation, low speed fan also, cooling capacity is greatly decreased, the heat generated from the motor, which will burn the motor. And the structure of frequency conversion motor and the ability to withstand voltage have been specially designed to meet the requirements of high speed and high harmonics.
