Extended high-speed operation via electronic winding-change method for AC motors

Electrified drive trains for tractors open great possibilities of raising performance in heavy agricultural operations due to high controllability and drive torque feedback. However, electric motor characteristics do not completely satisfy traction requirements in agricultural operations which imply high torques at low speeds as well as high transport speeds. The paper proposes to apply a winding switching method for electric wheel motors. The key advantage is the adjustment of resistance and flux to the optimal operation point which influences the motor characteristics and efficiency. Experiments show the transition of three winding configurations. The electric power for the traction drive is provided by a diesel-generator. Interaction of power flow and winding change is investigated.

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“…[8] is used as a basis for the switching circuit. This approach has been extended by delta and series switches in Fig.…”

Section: Winding Switch Methodsmentioning

confidence: 99%

“…SWAMY et.al. [8] has compared several winding switching solutions. As an result, a circuit has been presented which enables several star configurations for segmented stator windings.…”

Section: Previous Work In Winding Switchingmentioning

confidence: 99%

Winding switching strategy for electric wheel drives in agricultural machinery

Geissler

Osinenko

Herlitzius

2015

2015 IEEE International Conference on Industrial Technology (ICIT)

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“…Speed-torque control and change operations such as, i.e., velocity, are other means through which it is possible to impact EM performance. One of the most exploited methods in MFR configurations is PWM, however, previous works have shown the most significant disadvantage of this method, which is the generation of disturbances in the operation of the RFM, seeing the need to add an additional control to avoid such disturbance [16]. Furthermore, other RFM configurations such as commutable reluctance motors (RCM), allow a control method based on the electronic commutation of their windings, using isolated gate bipolar transistors (IGBT) as switching circuits, in addition to requiring a digital system for its operation.…”

Section: Introductionmentioning

confidence: 99%

Digital Pole Control for Speed and Torque Variation in an Axial Flux Motor with Permanent Magnets

2022

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The use of renewable energies in the transportation industry has prompted the development of higher power electric motors and intelligent electronic traction systems. However, the typical coupling between the two continues to be mechanical, which reduces its efficiency and useful life. On the other hand, permanent magnet axial flux motor configurations make it possible to dispense with mechanical couplings, due to their high torque at low speeds due to their direct application on the wheels of vehicles. In this work, the design of a digital pole commutation system is presented, applied to an axial flux motor with permanent magnets for speed and torque control at a constant speed. The performance of the system is evaluated with experimental measurements; proving the effectiveness of the design, obtaining torques of up to 1784 Nm without extra mechanical couplings and maximum speed regulation errors of 8.43%.

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“…The IMs utilized in the industry are designed to operate either in star or delta winding configuration. Online winding changeover techniques are a common practice either for inverter-fed [15][16][17][18][19][20] or for direct-online (DOL) [21][22][23] operated electrical machines. Within DOL motors, star-delta switches are predominantly used to improve the motor power factor and efficiency.…”

Section: Introductionmentioning

confidence: 99%

Current Ripple Reduction of Predictive Torque-Controlled Induction Motor Drive Using Delta-Star Switchover

et al. 2021

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The current and torque ripple of inverter-fed induction motor drives is an inherent problem of control strategies working with switching frequencies in the range of multiple kilohertz, such as direct torque and, more recently, predictive torque control. If the drive operates in a wide-speed and wide-torque range and is equipped with a machine with an accessible terminal block whose winding is nominally connected in delta, then the current and torque ripple can be reduced by utilizing the delta-star winding changeover technique. When the winding configuration is switched from delta to star, the instantaneous motor phase voltage peak is lowered, and its total harmonic distortion is reduced. However, the control strategy must be adjusted according to the actual winding topology, mainly due to the difference in the coordinate transformations of the measured currents and the difference between the phase voltage vectors obtained from the inverter. This paper proposes a predictive torque control of an induction motor drive with a switchable delta-star winding configuration. The paper is supported by theoretical background, and the key idea is verified by simulations in MATLAB/Simulink and experiments conducted on a dSPACE-controlled 5.5-kW laboratory drive. The simulations validated the presented equations and show the effects of not respecting the actual winding topology. The experiments mainly focused on analyzing the total harmonic distortion of the currents and consumed electrical power in multiple operating points.

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Extended high-speed operation via electronic winding-change method for AC motors

Cited by 89 publications

References 3 publications

Winding switching strategy for electric wheel drives in agricultural machinery

Winding switching strategy for electric wheel drives in agricultural machinery

Digital Pole Control for Speed and Torque Variation in an Axial Flux Motor with Permanent Magnets

Current Ripple Reduction of Predictive Torque-Controlled Induction Motor Drive Using Delta-Star Switchover

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