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.
The “direct-torque-control” (DTC) is an alternative to the commonly used “field oriented control” (FOC) for the control of a PMSM. One advantage of the DTC is its inherent ability of sensorless control. However at standstill and low speed range the back-EMF based model has problems to detect the rotor position. The switching command synchronized evaluation (SCSE) calculates the rotor position using...
The determination of the efficiency of electrical machines by direct measurements is often too imprecise if the efficiency exceeds 95 %. For electrically excited synchronous machines a standardized method exists to determine the efficiency by summation of the individual losses. This method needs a variable excitation and therefore cannot be used for permanent magnet synchronous machines. As permanent...
This paper presents a novel approach for measuring the differential inductances in a permanent magnet synchronous machine (PMSM). The knowledge of their accurate values is a prerequisite for sensorless vector controlled systems with carrier signal injection. For the measurements a standard industrial power converter is used. Besides the determination of self-inductances in the rotor-fixed reference...
This paper presents numerical torque simulations and sensorless control of a permanent magnet synchronous machine (PMSM). The machine was developed for a wheel-hub traction drive with a maximum torque of 4000 Nm. The Indirect Flux detection by Online Reactance Measurement (INFORM) method provides control at standstill and low speed without a rotor position sensor. A back electromotive force (EMF)...
A rotor of a buried permanent magnet machine can be constructed reliably by using magnets to support the rotor structure against centrifugal forces. In this work, a rotor solution with V- shape magnets in every pole are replaced with a rotor solution where every second pole are geometrically supported by the rest of the poles with the magnets. Effect of the replacement of the rotor is compared by...
This paper presents calculations and measurements for a permanent magnet synchronous machine (PMSM) with buried magnets. Due to wide field weakening capability and high utilisation of this external rotor machine, it can be especially used for traction applications. The steady-state torque is about 346 Nm and overload torque at three times nominal current is about 580 Nm. Fractional-slot concentrated...
This paper proposes an encoderless field-oriented control scheme for a permanent-magnet synchronous machine (PMSM) based on the back-EMF voltage. A polar stator coordinate representation is used to design a simple and robust position and speed estimator. The angle of the rotor is directly calculated based on stator current and voltage measurements as well as on knowledge of stator resistance and stator...
This paper investigates the nonlinear model of the permanent magnet synchronous machines (PMSMs). In order to incorporate the structural and saturation saliencies, two parameters are defined to indicate the saturation ratios. An analytical model is derived and the inductance matrix is expressed in both stationary and rotating reference frames, respectively. An incremental inductance measure system...
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.