Are there any inverter efficiency improvements?
A – All inverter design requires a certain amount of compromise. From the point of view of the motor, the ideal inverter would have a linear output, meaning that voltage and current would smoothly vary. However, linear control elements are inherently inefficient, and must be so; they act like variable resistors, and must therefore dissipate power while operating. The first compromise made in inverter design is the use of switch mode control elements. Switch mode control elements are either on, with minimized conduction losses, or off, with minimized losses because they aren’t carrying any current. The higher the switching frequency, the greater the fidelity of the inverter output. However, higher switching frequency also entails greater switching losses, produces greater EMI, and may also place greater stresses on the motor winding itself. Higher speed control elements also tend to be more expensive, and have greater conduction losses. The Chorus technology, with its increased harmonic
