Phase Balance Efficiency System to Improve Motor Efficiency and Power Quality

摘要

Triangular capacitor arrays have been used for many years to match inductive impedance and to correct power factor in 3-phase circuits. Recent studies of the electrical properties of the phase balance capacitor array, including harmonics retention, have revealed new methods of reducing system harmonic interference which combine to significantly increase induction motor efficiency. For example, in inductive circuits, by varying the capacitance of these arrays using harmonic sensors and feedback loops, a method is shown to construct harmonic filters within the motor-PB array complex. If these harmonics, which are necessary for motor action, are not dissipated, then they don't need to be regenerated, thus saving power and improving the motor efficiency by 3%-5%. In addition, these symmetric capacitor arrays can be used to balance the magnitudes of the single-phase voltage and amperage signals, moving them closer to the mean values over the 3 phases. This phase balancing method attenuates spikes and provides ride-through capacity to protect loads from thermal damage and improves circuit stability. Design and manufacturing methods of these phase balance arrays for WYE and Delta circuits are discussed.