•     For three-phase asynchronous motor made a detailed introduction, mainly on the components of Y series three-phase asynchronous motor, Y series three-phase asynchronous motors for the main components. Some of the major component of several major motor Y series three-phase asynchronous motors, there are major motor skill Teng Zhida brief consolidation.

       The first part of the stator core, there is a part of the magnetic circuit of the motor, which part is coated with a 0.35mm-0.5mm steel sheet laminated insulating paint composition.

       The second part of the stator winding, three-phase winding consists of three mutually independent windings.

       The third part of the rotor windings

       The last part of the mechanical parts: base, terminals, shafts and bearings.

  • No. Standard No. Standard name

    1 JB / T 5269-1991 YR series (IP23) three-phase induction motor (frame size 160--280)

    2 JB / T 5270-1991 YR series (IP23) three-phase induction motor (frame size 315--355)

    3 JB / T 5271-1991 Y series (IP23) three-phase induction motor (frame size 160--280)

    4 JB / T 5272-1991 Y series (IP23) three-phase induction motor (frame size 315--355)

    5 JB / T 5274-1991 Y series (IP44) three-phase induction motor (frame size 355)

    6 JB / T 6316-1992 Z4 series DC motor (frame size 100-355)

    7 JB / T 5330-1991 vibration source three-phase induction motor

    8 JB / T 5779-1991 with a motor brush holder size eqv IEC 60136: 1986

    9 JB / T 5810-1991 inter-pole motor coil and the field winding turn insulation test specification

    10 JB / T 5811-1991 AC low-voltage motor windings inter-turn insulation test methods and limits

    11 JB / T 5275-1991 Y-W series and Y-WF series of chemical

    corrosion-outdoor and outdoor three-phase induction motor (frame size


    12 JB / T 6447-1992 YCJ series gear reducer three-phase induction motor

    13 JB / T 2361-1992 constant brush holder

    14 JB / T 2839-1992 RAA type collector ring and brush holder

    15 JB / T 6297-1992 YLJ series torque three-phase induction motor

    16 JB / T 6448-1992 YEP series (IP44) near the magnetic brake three-phase asynchronous motor (frame size 80--160)

    17 JB / T 6449-1992 YH series (IP44) high slip three-phase induction motor (frame size 80--280)

    18 JB / T 6450-1992 YCTD series electromagnetic governor motor (frame size 100--315)

    19 JB / T 6456-1992 YEJ series (IP44) electromagnetic brake three-phase induction motor (frame size 80--225)

    20 JB / T 7118-2004 YVF2 series (IP54) frequency control special three-phase asynchronous motor (frame size 80 to 315)

  •    To start using the drive, the drive can be selected by the acceleration mode, such as a straight line, s curve.

       If asynchronous motors at rated voltage direct start, starting current will reach 6-8 times the rated current, the larger the motor capacity does not allow such a situation, you need to install the soft-start measures.

       The so-called soft start the motor, is through a variety of methods to control the stator terminal voltage is gradually increased from zero to the rated value, so that the starting current controlled so as to avoid the impact of electromagnetic torque during startup. Using impact on the grid voltage fluctuation of the motor soft start to avoid the total pressure starts to reduce the high-frequency power oscillations and resonance, while reducing motor insulation life and the hazards and risks to stationary machinery.

  • With the support over the development drive motor so that the inverter technology matures, smaller size, power range and the increase in functionality, the price is more reasonable. This provides the necessary material basis for frequency control three-phase asynchronous motors large number of applications. Inverter for motor control, can change both voltage and frequency can be changed. At present, only part of the motor manufacturers also produce VVVF three-phase asynchronous motor, the inverter and the motor did not design and production into one.

    There are a variety of inverter classification, according to the main circuit work classification, it can be divided into voltage-current converter and inverter; switching mode according to classification can be divided into the inverter PAM control, PWM control and high carrier frequency inverter PWM control inverter; according to the working principle of classification, can be divided into V / f control inverter, converter slip frequency control and vector control inverter, etc.; according to use classification, can be divided into general-purpose inverter, high-performance special inverter, high frequency inverter, single-phase and three-phase inverter drive and so on.

    Supporting the drive motor technology not only saves space, but also effectively eliminate the surge voltage, thereby reducing the variety of additional losses, while reducing the impact on the motor insulation voltage source, reducing the electrical potential manufacturing costs and maintenance costs.

  • Three-phase asynchronous motors in vertical and more continue to use the device occupies an important significance in people's lives. Discussion phase induction motor common electrical failure and maintenance, can reduce the loss of three-phase asynchronous motors motor electrical fault caused more conducive to promoting the use of three-phase asynchronous motors in life. From the three-phase induction motor fault characteristics and common fault detection method, it discusses the phenomenon of induction motor common electrical failure analysis, to provide reference for fault repair three asynchronous motor.

    First, the main characteristics of three-phase asynchronous motors failure

    Three-phase asynchronous motors failure and motor wear, aging, fatigue has a great relationship, according to the situation of failure, summed up the failure of three-phase asynchronous motors are mainly the following characteristics: First, potential, motor running process because of lubrication problems lead to wear of the motor, when after severe wear, parts motor parameters exceeding the permitted value, this is operated, the motor will have some potential failure. Second, gradual onset, wear three-phase asynchronous motors, fatigue, aging is developed over time, damage parts occurs gradually, damaged parts may be happening slowly, so it has a gradual onset. Third, ambiguity, because when the motor's internal and external environment is different, so causing damage to the motor with a certain randomness, have resulted in the failure criterion for judging dispersible. Fourth, the diversity in the process of equipment operation, since the wear, fatigue, corrosion occurs on the part of the aging time, the damage caused by parts are different, the fault is not caused by the same, for example: the motor rotor imbalance rotor shaft bending, bearing wear, aging, rotor bar failure. These four points are the main features of the three-phase asynchronous power-failure.

    Second, the three-phase asynchronous motors common electrical failure Phenomenon

    (A) the stator winding grounding

    1. Symptom

    Stator winding grounding stator winding is connected with the case, the winding current increases caused by the grounding, then often lead to winding a lot of heat, causing phase short circuit, so that the motor can not be normal operation, while in the process of failure with a lot of noise .

    2. Analyzing Method

    Stator winding grounding fault diagnosis methods are the following: First, observation, to observe the winding end and the notch for cracks and charred case, if there is a description of this part is the location of the fault; secondly, check test pencil, test pencil check the motor housing to see if the neon tube lights, if lights up, there is the case of stator winding grounding occurred; Third, check with a multimeter, check the terminal and the housing of the three-phase windings

    Between resistance, resistance is 0, then the winding shorted.

    3. The repair method

    Fix the stator winding grounding faults: find the point of failure, and then eliminate ground, if it is judged a failure to produce, but the core was observed at the notch no insulation breakdown, charred, etc., then the access point in the tank, it needs to continue to be checked If found no serious burn phenomenon, then between the ground and the core of the wire, put insulating material, and can be painted.

    (B) of the stator winding short circuit

    1. Symptom

    Stator windings open circuit is a coil wire insulation damage caused, this time turns directly connected, the motor current is large, the coil will get very hot when the disconnection turns a little while, the motor rotation can still function properly, but current increases, resulting in inconsistent three-phase current, which would make the motor torque decrease, when more turns short circuit, usually burn out the motor, the motor can not start.

    2. Analyzing Method

    Stator winding short circuit fault diagnosis includes the following ways: First, the external observation method, usually the motor apart and observe the color of the stator windings breaking point often presents black scorch marks, darker, insulating paint zoom black, fragmentation occurs carbonization phenomenon; Second, feel the temperature rise method, which is mainly the use of a short circuit will produce a lot of heat principle, the motor no-load operation for about 10 minutes, then off, quickly disassemble the motor, there are hand feel the temperature significantly higher places where these places are short circuit occurs; Third, universal table to check the resistance is found that the resistance is zero or very small, compared to a short circuit. Fourth, the resistance measurement method, the resistance values were measured more phase windings, then, there is a fault in a smaller value as compared to normal.

    3. The repair method

    Stator winding short circuit fault repair is usually to find out after the short circuit, the number of turns for a small, insulated, when the number of turns more time, winding replacement.