A method and control device for starting a motor with a power frequency inverter
A technology of power frequency inverter and starting motor, which is applied in the direction of motor generator control, electronic commutation motor control, control of electromechanical transmission devices, etc. The ability to carry load, the effect of reducing the excitation current and increasing the starting torque
Active Publication Date: 2021-01-08
HEFEI WIN POWER
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Problems solved by technology
[0005] The technical problem to be solved by the present invention lies in the fact that the starting motor of the power frequency inverter in the prior art mainly limits the large starting current through step-down starting, which easily leads to the reduction of the starting torque and cannot meet the starting requirements.
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[0041] The embodiments of the present invention are described in detail below. This embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present invention is not limited to the following implementation example.
[0042] A method for starting a motor with a power frequency inverter, which is applied to the start control circuit of a motor that uses the output of a power frequency inverter as a starting power supply, such as figure 2As shown, it is a control block diagram of a method for starting a motor with a power frequency inverter disclosed in an embodiment of the present invention. During the motor start process, the output voltage u and the output frequency of the power frequency inverter are controlled by the voltage-frequency ratio control module 6 The ratio of f is less than or equal to the preset constant c, where...
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The invention discloses a method of starting a motor by a power frequency inverter and a control device. The method comprises steps: during a motor starting process, the output voltage and the outputcurrent of the power frequency inverter are restricted; and, the ratio of the output voltage to the output current of the power frequency inverter is controlled to be smaller than or equal to a presetconstant. Large instantaneous starting current is controlled by a voltage reducing and current limiting mode, the ratio of the output voltage to the output current of the power frequency inverter iscontrolled to be smaller than or equal to the preset constant at the same time, the frequency is reduced while the voltage is reduced, the starting torque is increased, the ability of the motor with load is improved, the flux of the power frequency transformer and the flux of the motor are also ensured not to be saturated while the frequency is reduced, and the excitation current is reduced.
Description
technical field [0001] The invention relates to the technical field of electric motors and electric drives, and more specifically relates to a motor starting method and a control device using the output of a power frequency inverter as a starting power supply. Background technique [0002] Power frequency generally refers to the frequency of mains electricity, which is 50HZ in my country and 60HZ in some other countries. A transformer that can change the voltage of this frequency alternating current is called a power frequency transformer. An inverter using a power frequency transformer is a power frequency inverter. [0003] Such as figure 1 Shown is the topological structure diagram of the starting control circuit of the motor using the output of the power frequency inverter as the starting power, and the starting control circuit of the motor using the output of the power frequency inverter as the starting power includes a battery pack, a power frequency inverter Invert...
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IPC IPC(8): H02P1/26H02P21/34
Inventor 张为民周一晨
Owner HEFEI WIN POWER