Abstract
High torque and power density are unique merits of transverse flux machines (TFMs). TFMs are particularly suitable for use in direct-drive systems, that is, those power systems with no gearbox between the electric machine and the prime mover or load. Variable speed wind turbines and in-wheel traction seem to be great-potential applications for TFMs. Nevertheless, the cogging torque, efficiency, power factor and manufacturing of TFMs should still be improved. In this paper, a comprehensive review of TFMs topologies and design is made, dealing with TFM applications, topologies, operation, design and modeling.
Highlights
Control strategies reported in the same reference are field-oriented control (FOC) and direct torque control (DTC), these are classical techniques for PM synchronous machines (PMSMs) control
Interleaved PWM control of a SiC-based drive is proposed in [133] to coordinate the phases of the two stator sets of a double-sided transverse flux machines (TFMs): it offers a significant reduction in the capacitance, current and current ripple requirements of the DC-link capacitor bank, and smaller EMI filters are needed
According to TFMs literature, three basic ways to implement FOC have been explored for TFMs control: iq control, maximum torque per ampere (MTPA) control and maximum efficiency (ME) control
Summary
It should be noted that only TFMs can have either a radial or axial air gap, making it possible to have either a cylindrical or disk-shaped rotor. Unlike RFMs and AFMs, TFMs allow us to increase the motor torque by increasing the number of poles without affecting the flux linkage or current. An increase of the pole pairs, it should be noted that in RFMs or AFMs the pole area is halved if p is doubled, Ψm is halved and the torque remains the same, according to (1). In TFMs is it possible to increase p, keeping both Ψm and the diameter constant, so the torque and volumetric torque density increase in the same way
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