Starting method of high-power synchronous motor and high-power synchronous motor
A synchronous motor and high-power technology, which is applied in the direction of AC motor control, electrical components, starting devices, etc., can solve the problems of large starting current of motor generators, achieve convenient and effective control, prevent out-of-step, and reduce impact
Pending Publication Date: 2018-01-19
BEIJING DONGBIAO ELECTRONICS
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Problems solved by technology
The disadvantage of starting in this way is that the starting current of the motor generator is relatively large, which is about 2 to 4 times the rated current.
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[0029] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0030] The rotor of the electric excitation synchronous motor is made into a pole type, and the magnetic field coils installed on the magnetic pole core are connected in series with each other, connected to have alternate and opposite polarities, and two lead wires are connected to two coils mounted on the shaft. slip ring top. When the three-phase AC power supply is connected to the stator winding, a rotating magnetic field is generated in the motor, and the squirrel-cage winding cuts the magnetic force line to generate an induced current, thereby making the motor rotate. After the motor rotates, its speed increases slowly to slightly lower than the rotational speed of the rotating magnetic field. At this time, the rotor magnetic field coil is excited by direct current, so that certain magnetic poles are formed on the r...
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The invention relates to the technical field of motor control, in particular to a starting method of a high-power synchronous motor and a high-power synchronous motor. In order to solve the problem that a conventional high-power synchronous motor is difficult to start, the starting method provided solves the problems of out of synchronism, overcurrent, and large grid impact. According to the technical scheme, firstly, an electric excitation synchronous motor is used for feeding excitation current to a rotor; two quantities are given by direct-current braking, and one quantity is angle Theta and 0 degree is given, and the other quantity is a voltage amplitude value M; and then, a given frequency keeps the electric excitation synchronous motor rotor reaching the synchronous frequency, and the control mode of the current is closed-loop control; finally, the frequency is accelerated, and after the electric excitation synchronous motor frequency is accelerated by 5HZ, and a normal constant-voltage-frequency ratio control or vector control is carried out. The method is advantageous in that compared with a conventional starting manner, the current closed-loop control is added, the asynchronous starting link is not needed, so that the current and the whole starting process can be more conveniently and effectively controlled.
Description
technical field [0001] The invention relates to the technical field of motor control, in particular to a method for starting a high-power synchronous motor and the high-power synchronous motor. Background technique [0002] In the current inverter market, most synchronous motors are started by asynchronous start. The excitation winding of the motor is short-circuited through a current-limiting resistor, and the motor is put into the power grid in a static state. The rotor damping winding generates a strong induction current and interacts with the stator rotating magnetic field to generate an asynchronous electromagnetic torque, so that the motor starts like an induction motor and waits to be close to synchronization. When the speed is high, the excitation is turned on, and the unit enters into a synchronous state. The disadvantage of starting in this way is that the starting current of the motor generator is relatively large, which is about 2 to 4 times the rated current. ...
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IPC IPC(8): H02P6/20H02P6/28H02P25/026H02P27/08
Inventor 赵志芳赵金鹏姬红红周继华
Owner BEIJING DONGBIAO ELECTRONICS