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Small variable frequency motors-what are the effects of long-term low-frequency operation of three-phase asynchronous motors

author:xiaoE date:2021-06-11 11: 03

  Wanbang motor manufacturer reminds that ordinary three-phase asynchronous motors are designed according to constant power, constant frequency and constant torque. When the operating frequency does not meet the rated frequency, it will cause the motor to heat up and become weak.

  The following is the impact of the low-frequency operation of the three-phase asynchronous motor compiled by the Hubei Wanbang motor manufacturer.

  1. The main impact is the resonance problem of the three-phase asynchronous motor at certain frequencies;

  2. It is a heat dissipation problem. When the power supply frequency is lower, the loss caused by the higher harmonics in the power supply is relatively large. At other low frequencies, its built-in electric fan is not enough to cool itself, and the life of the motor drops sharply.

  Addition from Hubei Wanbang Motor Manufacturer: In addition, motor speed regulation can also be carried out through a hydraulic coupler.The hydraulic coupler is a machine equipment that operates the liquid medium to report the speed. Its active input shaft end is connected with the original transmission, and the driven output shaft end is connected with the load shaft end. By adjusting the pressure of the liquid medium, the output shaft The speed can be changed.In the ideal state, when the pressure tends to infinity, the output speed is equal to the input speed, which is equivalent to a rigid coupling.When the pressure is reduced, the output speed will decrease accordingly, and the medium pressure will be changed continuously, and the output speed can be steplessly adjusted lower than the input speed.

  However, the hydraulic coupler is inferior to the variable frequency motor in terms of speed regulation, speed regulation accuracy, efficiency, etc., but the value is more self-made.

  3. Ordinary motors do not allow long-term low-frequency operations, otherwise they may burn out if they have a serious fever.

  Wanbang motor manufacturer has a professional motor R&D team, which provides customers with fast, accurate, multi-variety, and batch motor customization requirements. The motor power, protection grade, maintenance and other aspects can be optimized according to the use scene of the customer's product, and the motor can be customized It has the characteristics of strong power, high work efficiency, high dust and waterproof level, long maintenance cycle, durability and so on.

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