The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Bit-Stream based control, which uses one bit wide signals to control power electronics applications, is a new approach for controller design. A Bit-Stream based control system for the Rotor Side Converter (RSC) of a Doubly Fed Induction Generator (DFIG) is proposed to demonstrate that the Bit-Stream control technique is suitable for complex vector control tasks. A new stator flux estimator and reference...
Externally excited synchronous machines exceptionally suit the needs of axle drives in automotive applications due to their high efficiency over the whole operation range and the advantages for the realization of the functional safety. With the rotor current giving an additional degree of freedom new possibilities and necessities come up, bearing special challenges regarding the control. A loss minimum...
Stepping motors are used in numerous applications because of their low manufacturing cost and simple speed control. It is well known that their energetic efficiency is low but actual values are typically not available. In this paper the influence of the control algorithm on the efficiency of the stepping motor is analyzed, measured and discussed. For a good comparison of the efficiency for the different...
Functional verification of new power-electronic converters and their control requires final verification at a test bench. For this suitable machine-sets have to be available. Changing type or rating of the machine requires high effort. Fast and cost-effective prototype development and testing and production-site quality monitoring becomes possible by replacing the machine-set with a suitably designed...
In this paper, an adaptive torque control scheme for Permanent Magnet Synchronous Motors (PMSM) used in automotive applications is presented. The proposed algorithm relies on stator currents and rotor speed measurements and achieves global asymptotic convergence of the torque to its desired time-varying reference. The appealing feature of the proposed scheme is that little information about the motor...
This paper presents three current control strategies for a switched reluctance machine (SRM). Two classical controllers are recall : the hysteresis and the proportional - integral controller. Dynamic and current ripples with both controllers are compared and discussed. Then, a new current controller qualified as “hybrid controller” is proposed. It is a combination of the two previous structures. The...
In direct drive applications TFM have been proposed as a powerful alternative. A working TFG and an appropriate power converter were developed. Transient simulation of the system with relevant disturbance influences is done efficiently. A current control is used to optimize power-feedback into the grid. Measurements show positive results.
If a Predictive Torque Controller neglects the saliency of a machine the resulting prediction error contains the rotor angle information. A scheme to extract this information is derived in linear theory and extended for the nonlinear effects of a real reluctance synchronous machine. Measurement results confirm that this saliency based approach without signal injection is able to operate in the entire...
A concept of an integrated and distributed inverter for switched reluctance machines is introduced. The application at hand is an outer-rotor direct drive designed for railway traction applications. A five-phase switched reluctance machine (SRM) was developed and is used to demonstrate the function of the integrated and distributed inverter. The distribution is achieved by supplying each phase coil...
This paper proposes the use of an integrated low cost SAW torque sensor to improve the dynamic performance of permanent magnet servo drive systems including rotor position detection. A start-up procedure that enables machine control at and from zero speed is discussed and results presented to illustrate performance.
An electrical losses (copper and iron losses) minimization control of interior permanent magnet synchronous motors is proposed in this paper. Until now a Look-up Table based maximum torque per armature current control strategy was proposed by authors. That is a control to minimize copper losses. Meanwhile, the efficiency deteriorates as a result that the iron losses increase sharply in high speed...
Conventional vector control of IPMSM requires a motor position sensor to correctly orient the current vector orthogonally to the flux. Thus, a high degree of torque control over a wide speed range can be achieved. Rotor speed position is measured using shaft encoder which is fixed manually on the rotor such that positive edge of the home signal per one revolution Z of the shaft encoder coincides with...
Tranverse flux machines (TFM) have been proposed as a powerful direct drive alternative. The construction and control of TFM have often proved a problem. In this paper the construction of a working transverse flux generator is presented. Its characteristics are predicted by a detailed FE simulation. Also a current control is designed that compensates unsymmetries and maximizes the power output. Measurements...
This paper deals with the development of a test bench for mild hybrid drives used in construction machines. Due to the special conditions under which construction machines are operating this test bench needs to be adapted. Hence the bearing of the electrical drive, which is mounted directly to the internal combustion engine, the temperature control by a cooling circuit and the integration of an appropriate...
Many methods have been published for minimizing pulsating torque using programmed reference current waveforms (PRCW), however there are still several problems with their implementation. One major problem is the need to determine motor and controller parameters very accurately. The task of parameter determination is a considerable challenge as any measurement usually involves a number of conversions...
This work deals with the experimental results of implementing an adaptive observer for a shunt connected DC motor. The observer is able to estimate the state variables and one unknown parameter. Estimated states are compared to the corresponding experimental states. Custom-made electronics designs are employed for the observer implementation and the off-line identification of some nominal parameters...
This paper describes a new identification approach for a synchronous electromechanical drive. The electrical and the mechanical parts of the drive are identified. The identification is done when the system is in closed loop and in real operating conditions. Thus the approach can be used to perform monitoring and diagnosis actions. The originality of the approach is in the use of the a priori known...
The paper presents an investigation on the direct instantaneous torque control (DITC) of a 1-hp four-phase 8/6 switched reluctance motor (SRM). In the proposed technique, the instantaneous phase torque was estimated in real-time using a pre-stored look-up table of measured static torque, T(i, ??), where phase current and phase flux linkage were input parameters. Therefore, a high-resolution encoder...
It is known that control strategies for most electrical machines are derived based on machine parameters, which are constant for most of the excitation range. However, due to the salient pole nature of Switched Reluctance Motor (SRM), the machine inductance is not only a function of the rotor angle but also is a function of the excitation current. This complicates the development of control strategies...
In this paper, a nonlinear control approach for permanent magnet synchronous motor (PMSM) drives, without mechanical sensors, is presented. The proposed method is based on a combination of the well-known nonlinear regulation technique, state-dependent Riccati equation (SDRE), and its filtering counterpart (SDREF) which is derived by constructing the dual of this control method. The SDREF is designed...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.