During the use of the torque motor, sometimes we will find that after the motor is energized, the motor does not rotate but it continuously emits a squeaky sound. If the motor is not energized, it will inevitably lead to a sudden increase in motor temperature during long-time operation, and even motor failure will occur.
The reason why the motor does not turn with electricity after it is energized is that: the stator winding and the rotor winding have an open circuit (one-phase breakage) or the power supply loses power; the winding lead wire ends are connected incorrectly or the winding internal connection is reversed; the power supply circuit contacts Loose, large contact resistance; motor load is too large or the rotor is stuck; power supply voltage is too low; small motor assembly is too tight or grease inside the bearing is too hard;
The countermeasures for disengaging the torque motor from humming are: to find out which points of the stator and rotor have broken points to repair; to check the polarity of windings, determine whether the end of the winding is correct, and correct connection errors in a timely manner; tighten the loose connection screws and use a multimeter. Determine whether each connector is falsely connected and repair it; reduce the load or detect and eliminate mechanical failure; check whether the specified Δ connection method is incorrectly connected to Y, and correct; if the pressure drop is too large due to the power supply wire is too fine, correct it; Small motors are re-assembled to make them flexible when they are too tight; qualified grease is replaced when the grease is too hard; the bearing is stuck and repaired in time.
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