Sine wave voltage regulator of permanent magnet alternating current generator

Abstract

The invention relates to a sine wave voltage regulator of a permanent magnet alternating current generator, and belongs to the field of high-tech products specially supported by nation. The sine wave voltage regulator can be used for a single-phase permanent magnet alternating current generator or a three-phase permanent magnet alternating current generator. The main design technical parameters are as follows: the voltage regulation precision is not less than 99.5%, the sine wave waveform distortion rate is not more than 1.5%, the voltage temperature characteristic is not more than 0.01 (% / DEG C), the impact resistant current is not less than 10 times of rated current, the voltage regulation action time is equal to 10 milliseconds, and the working frequency is equal to 10-1000 Hz. According to the invention, a capacitive alternating current load or an inductive alternating current load can be undertook, when the sine wave voltage regulator has a fault, the emergent power supply can be still provided for the load. The sine wave voltage regulator adopts a power electronics power device, an operation integrated circuit, a digital integrated circuit, a photoelectric coupling device and an aluminum-based copper clad plate material, and a working principle of a digital circuit, the product has excellent heat radiation and insulation functions, and the sine wave voltage regulator has the advantages of reasonable structure and convenience for regulation.

Description

technical field [0001] The invention relates to a permanent magnet alternator sine wave voltage regulator, which belongs to the field of high-tech transformation of traditional industries-advanced manufacturing technology-power electronics technology-special motor control technology in the catalog of high-tech fields supported by the state. Background technique [0002] my country's motor capacity is about 700 million kilowatts, and the annual new capacity is about 150 million kilowatts, but the high-efficiency and energy-saving motors account for less than 3%. The rare earth permanent magnet motor is a new type of high-efficiency energy-saving motor that saves energy and materials. According to the demonstration of engineering academicians and experts organized by the Environmental Protection Department of the National Development and Reform Commission, if 1 / 3 of the newly added motors are replaced by rare earth permanent magnet motors, it can save nearly 100% of electricity...

AI Technical Summary

Problems solved by technology

[0005] The permanent magnet alternator also has its own inherent technical defects: because the rotor magnetic field is formed by permanent magnets, the magnetic field lines generated by the magnets cut the stator coils with the rotation of the rotor to generate induced electromotive force, so that the generator can output voltage externally. A load current will be generated. According to Lenz's law, the magnetic field formed by the load current is in the opposite direction to the magnetic field generated by the rotor magnet of the generator, and will counteract the magnetic field formed by a part of the rotor magnet, while the magnetic field strength of the rotor magnet during operation is constant. , so the synthetic magnetic field strength decreases, which reduces the output voltage of the permanent magnet generator

[0006] The sine wave voltage regulation control of the three-phase permanent magnet alternator is more difficult

[0008] 1. The above-mentioned patent adopts three-point tracking technology, which only guarantees that the permanent magnet alternator is under the three conditions of no load, half load and full load, and the waveform distortion rate of the sine wave is small. Under other load conditions, the sine wave High waveform distortion rate

Therefore, this patent can only be used in conjunction with permanent magnet alternators with low power and waveform distortion requirements of ≤10%.

[0009] 2. There are three adjustable resistors in the electrical schematic diagram of the above patent, which are used to adjust and correct the waveform and voltage of the permanent magnet alternator under three conditions: no-load, half-load, and full-load. Users report that it is inconvenient to use. Especially when used in conjunction with a three-phase permanent magnet alternator

[0010] 3. The control circuit in the electrical schematic diagram of the above-mentioned patent adopts the working principle of an analog circuit, mainly using crystal triode components to amplify, and the amplification capability of the crystal triode changes with temperature, such as for medium and high-power three-phase permanent magnet AC power generation machine, there will inevitably be a non-ideal result of output voltage fluctuations caused by voltage regulation accuracy due to temperature rise fluctuations

Not set in the above patent

[0012] 5. A power sampling transformer is designed in the above patent, and the sine wave voltage waveform sampled by the transformer will produce about 10% distortion, which affects the fidelity of the output sine wave voltage waveform of the whole machine; the power frequency transformer is large in size, High cost and high failure rate are not conducive to the integration and automation of component assembly and production, and should be eliminated

Images