DC torque motors are a type of torque motor, powered by direct current. They are special-purpose motors with soft mechanical characteristics and a wide speed range. These motors deliver power not through constant power output but through constant torque output. DC torque motors can provide higher output speeds with lower output torque, allowing independent adjustment of speed and output torque, making them convenient to use and simple to operate, and offering superior controllability compared to standard AC torque motors.
Torque motors are characterized by their soft mechanical characteristics; as the load increases, the motor's speed automatically decreases, while the output torque increases, maintaining balance with the load. Equipped with a thyristor control unit, torque motors can adjust voltage and speed. They have a high locked-rotor torque and a low locked-rotor current, allowing for a certain period of locked-rotor operation. Due to the high rotor resistance and significant losses, the heat generated is substantial, especially during low-speed operation and locked-rotor conditions, which is why the motor is equipped with a coaxial fan or centrifugal fan on the rear cover for forced ventilation and cooling.
