The bearing is the most fragile part when a small or a medium-sized electric motor is running. If the bearing is damaged, circses as followed will happen: the increasing of the noise and the vibration, the rising of the working temperature, the decline of the matched equipments’precision, and it may even lead to the burning of the electric motors. So in order to extend the useful life by maintaining the bearings of electric motors, pay attention to the following factors in the course of the ins

1. Able to prevent from touching or approaching to the electriferous or rotating parts inside(with the exception of the smooth rotatable axletree and other similar parts),as well as to prevent the entry of foreign solid to motors.2. Prevent the entry of water to avoid the harmful effects caused by it.Second, the regulation of the protection classThe sign for the protection class: composed by the token letters “IP” and two token numbers followed. Thereinto, “IP” is the acronym of “the Intern

The type of product were composed of four parts .There are the product code, the specifications code, the special circumstances code and supplementary code. They are arranged in the following order: the products code - the specifications code - the special circumstances code - supplementary code.一、 Product Code: were composed of four components of the order。There are the type of electric motor code, the characteristics code of electric motor, serial number of the design, and the code of exci

Work system can be divided into continuous, short, periodic or aperiodic types. Periodic working system includes one or more specified constant duration of load, and the load during the running of the motor does not reach the thermal stability; non periodic work of load and speed usually changes in operating within the range.Working code usually indicated by S1~S10, the following are briefly introduced, we compare the common duty type. 1 S1 operating system: continuous working system; keep in co

1, the efficiency η: motor output mechanical power and the input power ratio, usually expressed as a percentage.2, power factor cosφ: motor input active power and apparent power ratio.3, Stall current I1 (starting current Ist): motor at rated voltage, rated frequency and rotor blocked input from the power supply circuit maximum steady-state rms current.4, stall torque T1 (starting torque Tst): motor at rated voltage, rated frequency and blocked rotor torque generated when the minimum measured

HM2-100L1-4-2.2KW three phase asynchronous motor for star connection. After starting 2 hours after normal output operation, still with full load, the motor speed is decreased rapidly, the winding heats up quickly, if you want to maintain the original speed operation, with only 60% of the rated load, once the motor stops will not re-start. Failure Analysis: the above phenomenon, multi-phase asynchronous motor walking single-phase. When a power failure, the star connection of the two-phase windin

1.Brush and commutator poor contact or brush wear too short; the grinding brush contact surface, replaced with new brushes. 2. Brush on uneven spring pressure: Proper adjustment of the spring pressure, so that each brush pressure maintained at 1.47 × 104 to 2.45 × 104Pa, also rely on the hand feeling. 3. Brush holder will loose brush holder bolts fastening the brush holder and parallel to the surface of the commutator; brush holder from the commutator surface distance is too large; adjust th

Winding wet processing method: (1) winding damp caused the ground should be dried, cooled to about 60 - 70 ° C, doused with the insulating paint after drying. (2) end winding insulation damage at the ground, re-insulated, painted, and then drying. (3) the winding ground point in the tank, should be re-wound windings or replacement of part of the winding element. Finally apply a different megger to measure, can meet the technical requirements.

The motor control system by the switch, a small transformer, fuse, main contactors, relays, temperature, pressure sensing device, etc., is relatively complicated. Often need the help of a variety of fault, control schematic analysis investigation. Usually pay attention to maintain control box outside the clean and dry, no water, oil, on a regular basis with a small sweep fan blowing components and terminal box clean, the rafts dust, or brush clean with a brush dipped in cleaning appliances, so

The normal operation of the motor should be issued a uniform and lighter buzzing sound, no noise, and special sound. Too much noise, electromagnetic noise, bearing noise, ventilation noise, mechanical friction sound, may be a sign of failure or malfunction phenomenon. Electromagnetic noise, electric motors fluctuated heavy sound, the cause may be the following. (1) non-uniform air gap between the stator and the rotor, the sound peaks and valleys and the high and low interval is the same, this