We have learned about the structure of permanent magnet synchronous motors before. We know that there are three types of motor structures: surface-mounted, plug-in and embedded. So what are the components of a permanent magnet synchronous motor? And what are its advantages and disadvantages? Find out together below!
Advantages: Compared with ordinary AC variable frequency motors, permanent magnet synchronous motors have high efficiency, high torque to inertia ratio, and high energy density. They are environmentally friendly and low-carbon motors. General AC motors are driven by frequency converters, while permanent magnet synchronous motors are driven by special drivers, such as Sanjing S3000B.
Disadvantages: The torque is bound by the demagnetization of the permanent magnet, poor earthquake resistance, limited high speed, small power, complex motor structure, high cost and difficulty in starting.
The components of the permanent magnet synchronous motor that actively adjusts the excitation include: machine-end voltage transformer, machine-end current transformer, and excitation transformer.
The excitation equipment needs to provide the following currents: factory AC380v, factory DC220v control power supply, and factory DC220v closing power supply.
It is required to provide the following empty contacts: active start, active stop, grid connection (one normally open, one normally closed) increase and decrease.
The following analog signals are required: generator terminal voltage 100V, generator terminal current, bus voltage 100V.
The excitation device outputs the following relay contact signals: excitation overcurrent, loss of excitation, abnormality of the excitation equipment, etc.
The excitation control, maintenance and signal loop consists of excitation switch, excitation circuit, fan, excitation switch tripping, excitation transformer overcurrent, regulator failure, abnormal generator working conditions, power transmitter, etc.
When an internal fault occurs in a synchronous generator, in addition to the need to demagnetize, it is also necessary to demagnetize the rotor magnetic field to a as soon as possible to ensure that the demagnetization time is shortened as much as possible when the rotor fails. It is a demagnetization device. main functions. According to the rated excitation voltage, it can be divided into linear resistor demagnetization and nonlinear resistor demagnetization.
In the past ten years, due to the emergence and application of new technologies, new processes and new equipment, the excitation methods of generators have been continuously developed and improved.
In terms of automatic adjustment of excitation devices, many new types of adjustment equipment have been continuously developed, promoted and used. Because there are obvious advantages in using microcomputer software to realize the active adjustment of excitation devices, many countries are now developing and experimenting with digital active adjustment excitation equipment composed of microcomputers and corresponding external equipment. This kind of adjustment equipment will be able to complete automatic Adapt to adjustment.
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