Abstract
To meet the demand for increasingly high power density in electric drives, the concept of a so-called integrated modular motor drive has emerged. The machine is composed of multiple identical modules, which receive individual control signals for multiphase control, to reduce unwanted stator current harmonics. Each module is equipped with its own power electronic converter, which is integrated in the machine housing. This integration imposes strict constraints on the dc-link capacitor design. To reduce the dc-link current ripple, and hence relax the design constraints on the dc-link capacitor, without compromising the possibility to eliminate unwanted stator current harmonics by means of multiphase control, a new interleaving strategy is proposed in this article. The n modules of the machine are split into p subgroups of m modules for interleaving, while the n-phase control is preserved. An analytical model, simulations and experimental results are provided for a 4 kW test setup, confirming that multiphase control can be combined with interleaving. As a result, both the stator current harmonic distortion and the dc-link current ripple can be reduced simultaneously.
Highlights
T HE HIGH energy efficiency, high power density, and high operating temperatures of emerging power electronic technologies make so-called integrated modular motor drives (IMMDs) a viable possibility [1], [2]: the power electronic converters are integrated in the machine housing and the machine is discretized into n separate modules
The stator of an axial flux permanent magnet synchronous machine (AFPMSM) with yokeless and segmented armature (YASA) topology is composed of n separate stator core elements [3]
Due to its high efficiency, low weight and compactness, and the resulting high power density, an AFPMSM with YASA topology can be used in transport, energy, and industrial applications [3]–[5]
Summary
T HE HIGH energy efficiency, high power density, and high operating temperatures of emerging power electronic technologies make so-called integrated modular motor drives (IMMDs) a viable possibility [1], [2]: the power electronic converters are integrated in the machine housing and the machine is discretized into n separate modules. An increased power density of the motor-drive combination can be obtained due to the volume decrease as a result of the shared housing Another advantage of an IMMD, is the feature that the current in each of the n stator modules can be controlled separately. —just as in the other papers where this interleaving technique is applied to the inverter of a segmented multiphase machine [33], [34] or an IMMD [35]–[37]—this interleaving technique is accompanied by a downgrade from an n-phase control to an m-phase control According to this traditional interleaving strategy, which is illustrated, each subgroup gets a dedicated carrier waveform, but the same m-phase reference as the other subgroups. The traditional interleaving strategy properly addresses the challenges concerning the PE design of an IMMD on the one hand, but impedes the benefits of multiphase control on the other hand by reducing the available degrees of freedom for the stator current control. The reduction in dc-link current ripple with this new interleaving strategy (which is a combination of multiphase control and interleaving) is compared to the
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