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Principle and characteristics of variable load phaser

2019-09-26

The variable load phaser is connected to the motor rotor control loop, and the motor operation is determined according to the operating current and the working voltage data signal of the collected motor, and the information content and the motor rotor collected by the motor rotor current sensor are collected. The electric current data signal and the same data signal presented by the DC working voltage are sent to the single-chip design to solve the problem. According to the operation of the motor, the compensation amount is fully adjusted and the dynamic compensation is maintained. The principle is shown in Figure 1. The main board interface CPU of the variable load phaser has a moderately open opening command. After the opening board is enlarged, the AC-DC converter device consisting of 12 thyristors is operated to convert the DC switching power supply to the same amount as the motor rotor current. The potential difference between the frequency and the position is added to the rotor control circuit of the motor, and then the positional relationship between the motor rotor current and the motor rotor operating voltage is changed, and the positional relationship between the motor motor stator current and the motor stator operating voltage is changed according to the electromagnetic field. Reducing the power factor angle, and finally making the motor's own power factor enough to improve, the motor stator current is enough to reduce, more than the compensation for the purpose of the motor.

The compensation characteristics of the variable load phaser under the same load are much better than the general static passive phase advancer. This is because the variable load phaser uses dual CPU operation, which can adjust the relevant main parameters according to the load transition, and exceed the dynamic compensation. The purpose of the power factor is to optimize the situation from start to finish; while the stationary and non-moving phase-in phaser is a fully-injected machine, and its switching amount cannot be sorted automatically as the high-voltage capacitor compensates. It is not possible to adjust the dynamic compensation as moderately as the variable load phaser. Therefore, the reactive power compensation can not be oversized, otherwise the over-load condition can occur under light load conditions; It is not possible to design a solution that is too small, otherwise it will be "under-filled" under light load conditions. For this reason, if the static immovable phaser is applied to the equipment with frequent load changes, it will cause the phaser to switch frequently, which may cause the power factor to fluctuate greatly, which is very likely to cause the phase changer to be destroyed and concentrated. The high-voltage capacitor for compensation is cracked. Because of this, the stationary phase-in phaser is only used in machines with relatively stable loads, and must be delivered under conditions where the machine exceeds 80% of the rated value.

The variable load phaser is based on the application limitations of the static immovable phaser, multi-faceted new product development, the application of dual CPU operation, modest adjustment of the single pulse and conduction angle according to the load transition, and according to "crossing - AC/DC inverter equipment converts the DC switching power supply to the same frequency and the potential difference of the position, which is added to the rotor of the motor, and exceeds the dynamic compensation. The power factor is optimized from 0.95 to 0.99 from start to finish. The variable load phase internator is also suitable for equipment with relatively stable load such as centrifugal fan and centrifugal water pump. However, the structure of the variable load phase inverter is complicated and the manufacturing cost is relatively high. Therefore, in the motor selection of the concrete production equipment, the machine equipment with a large change in the operational load adopts a variable load phaser and the machine with relatively stable load. It can be used with a stationary immovable phaser.


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