A soft start method for three-phase medium frequency motor
An intermediate frequency motor, soft start technology, applied in the direction of a single multi-phase induction motor starter, motor generator/starter, etc., can solve the problems of complex structure, increased cost and large size of the frequency converter, and achieve a wide range of application prospects, The effect of reducing startup current and saving hardware cost
Inactive Publication Date: 2017-10-24
ANHUI AGRICULTURAL UNIVERSITY
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Problems solved by technology
Using frequency converter to achieve soft start of motor is good, but the structure of frequency converter is complex, bulky, heavy, and greatly increases the cost
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[0029] Exemplary embodiments of the present invention will be described in detail below. The description of the exemplary embodiments is for the purpose of illustration only, and in no way limits the invention and its application or usage.
[0030] According to the starting method of the motor mentioned in the background technology mentioned above, after analysis, it is believed that the reason why the starting torque of the intermediate frequency motor with a frequency of 400 Hz is smaller than that of the commercial frequency motor may be related to the following factors. The first is the rated speed of the intermediate frequency motor High, the difference between the rotor (0 speed) and the rotating magnetic field of the stator is too large when starting; the second is that compared with the power frequency motor with the same power frequency of 50Hz, its volume is small, so the rotor diameter is also small (same conditions The lower rotor diameter is small and the torque i...
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The invention relates to a soft start method for a three-phase intermediate frequency motor, comprising the following steps: providing a three-phase intermediate frequency motor; providing an intermediate frequency power supply for the above three-phase intermediate frequency motor; providing a thyristor step-down starting circuit, the controllable The silicon step-down starting circuit is used to step down the intermediate frequency power supply and supply the reduced voltage to the intermediate frequency motor; control the thyristor step-down circuit to reduce the frequency of the low-voltage voltage output by it; the speed of the intermediate frequency motor reaches After the predetermined value, stop the frequency reduction control of the silicon controlled rectifier step-down circuit, and continue the voltage control, so that the intermediate frequency motor gradually enters the normal working state. According to the soft start method for the intermediate frequency motor of the present invention, the intermediate frequency motor can be started smoothly under the drive of the voltage signal with reduced voltage and frequency, which reduces the starting current of the intermediate frequency motor and prolongs the service life of the intermediate frequency motor. The impact on the intermediate frequency power supply is very small, which protects the safety of other electrical equipment in the circuit.
Description
technical field [0001] The present invention relates to a method for starting a motor, more specifically, to a method for soft starting a three-phase medium-frequency motor. Background technique [0002] The technical background related to the present invention will be described below, but these descriptions do not necessarily constitute the prior art of the present invention. [0003] Compared with the industrial frequency motor with a working frequency of 50Hz, the medium frequency motor with a working frequency of 400Hz, for example, has the advantages of small size, high power and high speed, and is widely used in aviation, ships, military, scientific research and other fields. In most occasions where intermediate frequency motors are used, the capacity of 400Hz intermediate frequency power supply is limited, and the starting current of high-power intermediate frequency motors can reach 5 to 7 times the normal operating current, which has a very negative impact on the sa...
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IPC IPC(8): H02P1/26
Inventor 孙力高琪娟鲍健赵宇马元龙张敏丁璇璇
Owner ANHUI AGRICULTURAL UNIVERSITY