The gearbox manufacturer stated that this situation is similar to the lighting at home, with a lot of high current during startup. However, during normal use, the current will be higher than when it was just started, and so will the motor. What is the principle behind this? It is necessary for us to understand from the perspective of the starting principle of the motor and the rotation principle of the motor: when the induction motor is in a stopped state, from an electromagnetic perspective, it is like a transformer. The stator winding connected to the power supply is equivalent to the primary coil of the transformer, and the closed rotor winding is equivalent to the secondary coil of the transformer that has been short circuited; There is no electrical connection between the stator winding and the rotor winding, only a magnetic connection, and the magnetic flux forms a closed circuit through the stator, air gap, and rotor core. At the moment of closing, the rotor has not turned up due to inertia, and the rotating magnetic field cuts the rotor winding at a larger cutting speed - synchronous speed, so that the rotor winding can induce a higher potential that can be reached. Therefore, a large current flows through the rotor conductor, and this current generates magnetic energy that can offset the stator magnetic field, just as the secondary magnetic flux of a transformer can offset the primary magnetic flux.
Another situation is quality issues when manufacturers use raw materials. Some manufacturers choose materials for reducers to save costs and lower prices by using inferior ones. In this situation, even if the user is running normally, it is easy to experience tooth tapping. Normally, the box material used is HT250 high-strength cast iron, while the gear material is made of high-quality 20CrMo alloy steel and has undergone multiple carburizing treatments. The surface hardness of the flat key on the reducer shaft reaches HRC50. So when choosing a gear reducer, it is necessary to have a relevant understanding of the gear reducer and not only care about the price.
There are two possible situations for this user, one is their own problem. During the use of the reducer motor, when it exceeds the load operation of the machinery itself, there may be situations where the machine cannot withstand overload operation. Therefore, when selling the reducer, we also remind customers not to operate under low load, which will cause the corresponding gears or worm gears of the reducer motor to be unable to withstand throughout the entire operation process, resulting in such situations - tooth chipping or increased wear.
Post time: May-17-2023
