life nidec motor: Due to size constraints and brush commutator, the direct current motor speed is generally within 3000-12000 rev / min range, speed increases, the working life of the direct current motor is significantly reduced.
　　Operating life depends on the direct current motor brush and commutator wear of mechanical and electrochemical corrosion, at rated load torque and speed conditions, continuous operation of 300 to 500 hours. Using precision low noise of the motor, installed inside the varistor to reduce environmental electromagnetic interference. Load torque DC motor for speed, there is a direct relationship between the current speed increases linearly with the load decreases, the current increases linearly.
　　The selection of specifications, should be near its maximum efficiency point of work to get a good operating performance, operating life and stability characteristics.
　　Often occur when DC gear motor commutation some failures, mainly due to the size and brush commutation spark wear on the surrounding environment. The following small series to introduce some tips DC gear motor commutation, for your reference.
　　Within DC gear motor armature winding is AC induction, brushless DC motor through the mechanical action of the brush and commutator point, so that current flows in the external circuit of a DC current. The so-called commutation, is to use mechanical force to make a coil current in a very off-time from one value to another value transformation. For DC Gear Motor, the change forward after the current equal and opposite direction.
　　DC motor commutation failure, mainly refers to more than the standard brush commutation spark under. Normal operation of the commutator segments, the surface should be smooth, there should be a layer of dark brown cuprous oxide protective layer, the protective layer can increase the brush and commutator contact resistance between the pieces, short circuit current is reduced under the brush, protection commutator being worn, thus improving the working conditions of the segments, reducing the spark.
　　If the following circumstances surrounding environment, will increase the commutation spark, the brush and commutator wear piece intensifies: there is not enough oxygen in the air, can not make the commutator surface oxide film layer intact; the air temperature is too low commutator surface is difficult to form an oxide film; the air contains corrosive gas and dust, corrosive gas and dust which can destroy the oxide film has been formed, servo reversing cause difficulties, exacerbated by brush wear.