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It is clear that, for small machines, the use of Z equal to 24 could lead to unacceptable slot dimensions. The prototype of this machine was also tested, recording the vacuum induced electromotive forces and then verifying the perfect electrical symmetry of the 9-phase winding, as shown in figure 6. A further example of application is the phase motor shown in figure 7, consisting of four three-phase windings offset by 90 degrees, each characterized by 7 slots and 6 poles.

The choice of an unconventional winding in the case of what is shown in figure 7, was dictated by the need to have for the maximum frequency allowed and the nominal speed a total number of 24 poles, to be divided between the 4 independent units, of which the machine must consist for fault tolerance reasons. This resulted, for each unit, in a maximum number of 6 poles. In this case, the project concerned the development of an electric outboard motor with integrated propeller, where space constraints were predominant.

The first conventional one was rejected because the torque ripple was too high. The only remaining options were therefore unconventional, i. The second was chosen because of its lower magnet losses and the almost zero torque ripple. The results of the tests are shown in figure 9, where the waveforms recorded on the test bench are compared with those obtained by simulation of the machine with the finite element method in the time domain.


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  • The results confirm the perfect symmetry of the machine and the excellent agreement between design forecasts and experimental behaviour. Similar waveforms, which do not show any unexpected phenomenon as a consequence of the choice of an unconventional winding, were also obtained by loading the other two machine units. It was also shown that, through similar optimization techniques, it is possible to design machines with concentrated windings with combinations of number of slots and poles traditionally considered incompatible or not feasible in symmetrical form.

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    Finally, some application examples have been illustrated of how this can be of interest, especially but not only in the design of concentrated winding machines with more than three phases. It is therefore an operational approach and a methodology that, in fact, provides useful elements for greater freedom in design and execution.

    Save my name, email, and website in this browser for the next time I comment. Friday, July 5, Electric Motor Engineering.

    Non-conventional design of concentrated windings - Electric Motor Engineering

    Example of a distributed stator winding; b concentrated winding for small low-voltage electric motor; c concentrated winding for large medium-voltage electric generator. Please enter your comment! Please enter your name here. It is clear that, for small machines, the use of Z equal to 24 could lead to unacceptable slot dimensions. The prototype of this machine was also tested, recording the vacuum induced electromotive forces and then verifying the perfect electrical symmetry of the 9-phase winding, as shown in figure 6.

    A further example of application is the phase motor shown in figure 7, consisting of four three-phase windings offset by 90 degrees, each characterized by 7 slots and 6 poles.

    Non-conventional design of concentrated windings

    The choice of an unconventional winding in the case of what is shown in figure 7, was dictated by the need to have for the maximum frequency allowed and the nominal speed a total number of 24 poles, to be divided between the 4 independent units, of which the machine must consist for fault tolerance reasons. This resulted, for each unit, in a maximum number of 6 poles. In this case, the project concerned the development of an electric outboard motor with integrated propeller, where space constraints were predominant.


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    The first conventional one was rejected because the torque ripple was too high. The only remaining options were therefore unconventional, i. The second was chosen because of its lower magnet losses and the almost zero torque ripple. The results of the tests are shown in figure 9, where the waveforms recorded on the test bench are compared with those obtained by simulation of the machine with the finite element method in the time domain.

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    The results confirm the perfect symmetry of the machine and the excellent agreement between design forecasts and experimental behaviour. Similar waveforms, which do not show any unexpected phenomenon as a consequence of the choice of an unconventional winding, were also obtained by loading the other two machine units.

    It was also shown that, through similar optimization techniques, it is possible to design machines with concentrated windings with combinations of number of slots and poles traditionally considered incompatible or not feasible in symmetrical form. Finally, some application examples have been illustrated of how this can be of interest, especially but not only in the design of concentrated winding machines with more than three phases.

    It is therefore an operational approach and a methodology that, in fact, provides useful elements for greater freedom in design and execution. Save my name, email, and website in this browser for the next time I comment. Friday, July 5, Electric Motor Engineering. Example of a distributed stator winding; b concentrated winding for small low-voltage electric motor; c concentrated winding for large medium-voltage electric generator. Please enter your comment! Please enter your name here.