Polyphase Motor Analysis
Ryan Christian
Building and leading a High Performance TEAM of Technical Sales Professionals impacting mission critical projects and programs.
By: Christoph Wiedner, Power Manager, DEWETRON GmbH
Why polyphase motors are used?
Polyphase motors are used in response to the demand for high efficiency by international standards (like IEC 60034), the rising costs of copper and metal sheeting, and increasing demands for durability and product quality have stimulated the development and use of poly-phase motors and poly-phase-drive-trains. By its design, it’s possible to reduce copper for the windings and metal sheets of the stator. Poly-phase motors are more efficient due to reduced copper and rotor losses as well as the reduction of Harmonic loads. Harmonics, which are the result of direction of the rotor and the opposing rotary field produced by the stator, create a cogging torque that generates noise and vibration. It’s possible to increase the range of electrical vehicles and industrial drives by reducing harmonic loads. Another benefit to polyphase motors is the higher torque of those motors resulting from the lower harmonic load during start up procedures. Reduction of the 5. and 7. harmonic help to reduce losses, noise, and vibration which results in highly efficient motors and drive trains! If we compare a 3-Phase and 6-Phase Motor with 30kW we can see a higher efficiency of 1% on the side of the 6-Phase motor.
Challenges for power analyzer
It’s a fact that conventional power analyzers can manage up to 4 or 6 power channels, max. This leads to the problem of power analysis of polyphase motors and polyphase drive trains. The need for reliable and traceable efficiency calculations requires power analyzers with more than 6 power channels, the capacity to store the raw data, precision power calculation of several power groups with variable synch sources and the option for the online calculation of mechanical parameters and mechanical power. This is precisely where we come in with our MIXED-SIGNAL POWER-ANALYZER!
The DEWE2-PA7 MIXED-SIGNAL POWER-ANALYZER combines the strengths of a conventional power analyzer, a gapless recorder and a power scope. With up to 12 power channels, online calculation of several power groups with variable sync sources and up to 7 phases for each group, the PA7 is the need based power analyzer for analysis of polyhase motors and drive-trains. Moreover, it’s possible to record and analyze any analog or digital signal, turning the the PA7 into a mixed signal power analyzer.
Intuitive operation of a mixed signal power analyzer
State-of-the-art hard- and software engineering combined with innovative usability makes it easy to concentrate on the important things -completing your tasks! OXYGEN? Measurement Software is the solution for power analysis, offering minimal configuration effort and intuitive operation. A Touch display, multi touch gestures, predefined schematics and unrivaled stability and precision make the DEWE2-PA7 the iPhone of Power Analyzers.