Weichuang Inverter Slip Motor Frequency Conversion Retrofit Energy Saving Application
I. Analysis of electric drive system of slip motor
1. Power is wasted seriously. The electromagnetic speed regulating motor is a tributary constant torque stepless speed regulating motor. The utility model is composed of an ordinary squirrel cage asynchronous motor, an electromagnetic slip clutch, a speed measuring motor and a control motor and a control device. The electric motor is driven as a 0-thick motive, and the electromagnetic slip clutch is used as a torque transmitter to transmit the output torque of the electric motor to the load side.
The electromagnetic slip clutch consists of two basic parts: (1) armature (main rotating rotor) (2) magnetic pole and exciting coil force (driven rotor). The armature rotation speed is constant, and the armature is coupled with the driven rotor through magnetic coupling, which drives the driven rotor to rotate, and changes the excitation current of the electromagnetic slip clutch to adjust the rotational speed of the driven rotor. The magnetic coupling loss is large, the eddy current loss is large, and it is easy to use heat and power waste. Xiangtan Chenhui Chemical Building Materials Co., Ltd. has two extruders with a 22KW electromagnetic speed governor; a 22KW ordinary machine buckle frequency converter. Under the same working conditions, the electromagnetic speed regulating motor consumes more than 30% of energy. Greatly increased production costs.
2. The characteristics of the electromagnetic speed regulating motor are soft. Although there is a speed reversal, the speed regulation is unstable, which greatly affects the product quality.
3. The electromagnetic speed regulating motor has a complicated structure and large heat generation, which has a great influence on production maintenance and production environment.
Second, the variable transmission system uses the superiority of the inverter:
The frequency converter is in the range of speed regulation, starting characteristics, dynamic response, adjustment accuracy, output characteristics, economic indicators and convenient operation and monitoring; all are superior to electromagnetic speed regulation. In addition, the frequency conversion speed regulation also has the advantages of perfect protection function, versatility, small maintenance workload, safe and reliable operation, low power consumption and long equipment life. The transfer can start from zero and start to increase speed, and can choose the speed increase and decrease curve, which is remarkable in energy saving and won praise from operators and maintenance personnel.
Third, the use of frequency converter benefit analysis:
According to the actual situation, the inverter can achieve 30% energy saving effect and save electricity. Take a 37KW slip motor as an example 37 (KW) × 24 (hours) × 12 (months) × 30% = 95904KW
According to the calculation of 0.5 generations per kilowatt hour, electricity costs can be saved:
95904×0.5=47952 yuan
Fourth, equipment investment:
37KW inverter AC60-T3-37KW
Another purchase of a common asynchronous motor 37KW
