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Equivalent circuit parameters are very important for permanent magnet synchronous machines since they serve as the basis for performance estimation and implementation of power electronic drives controls. Specified in the newly approved IEEE Std 1812, a short-circuit test can be employed, in combination with an open-circuit measurement, in order to determine the back emf and the synchronous inductance...
This paper proposes a method based on signal injection to obtain the saturated current-flux relations of a PMSM from locked-rotor experiments. With respect to the classical method based on time integration, it has the main advantage of being completely independent of the stator resistance; moreover, it is less sensitive to voltage biases due to the power inverter, as the injected signal may be fairly...
This paper studies the effect of different slice count on quality of multi-slice simulation. The slices are distributed evenly along the axial length of the machine. The torque and current waveforms at nominal point are analysed for different numbers of slices, and compared with the measured waveforms. Practical optimum is identified finding a trade-off between simulation time and results quality.
This paper presents the design of Unscented Kalman Filter (UKF) for estimation of state space variables of permanent magnet synchronous machine (PMSM). The UKF is shown together with the field oriented speed control. At first, the position and the speed of PMSM are measured, and UKF is used only for a load torque estimation. It is indicated how differences in sampling time of the speed and the current...
This paper presents the modelling and simulation of a low-power Brushless DC machine in a Rotor Flux Oriented mode in MATLAB/Simulink. The modelling of the machine is presented in the synchronous dq frame. Using this model suitable Proportional Integral controllers have been designed for the Rotor Flux Oriented speed and current loops. Sensorless simulation estimates obtained from a back-emf observer...
Torque ripple presents the main disadvantage of switched reluctance motor. Advanced control methods allow to minimize the torque ripple, which requires knowing the motor parameters — inductance and torque characteristics. The paper presents parameter identification of switched reluctance motor with 2p1/2p2 = 12/8 number of poles. Included in this document are results of inductance and torque measurements...
This paper highlights the widespread use of fractal analysis, by way of example in the comparative study, of the longterm normal functioning of SRMs. In the paper we considered the behaviors of two classes of SRMs: — with linear core and nonlinear core, respectively — for three types of loads (resistant torques): constant torque, linear torque variable with shaft speed, variable torque with the square...
The paper deals with various sensorless techniques for SRM. The theory of most these techniques is described and their advantages and disadvantages are discussed. Simulation of a SRM traction drive for an electric vehicle was created and experimentally verified. A selected method is simulated on the base of a real SRM for various operating range and conditions. The method is analyzed from the point...
The direct torque control (DTC) strategy is one of the most performance methods for induction machine (IM) drive torque control. The controlled stator magnetic flux and torque cannot be easily measured and therefore must be calculated using an IM mathematical model. This paper examines the impact of the replacement the original voltage IM model by Luenberger observer on the drive performance. As the...
In the current transfer machine for the flexible band, the equipment sometimes stops due to fluctuations in the tension of the flexible band, the readjustment is required at this time and the productivity is reduced. Therefore, in this study, we clarified factors influencing the positioning accuracy of the flexible band, proposed a monitoring method of operating condition, and aimed at the improvement...
A novel extended state observer (ESO)-based vector control (VC) strategy is developed for permanent magnet synchronous motor (PMSM) drive systems with only one phase current sensor. Generally, to achieve high precision control, two phase current sensors are indispensable for successful operation of the feedback control. In response to a phase current sensor fault, by use of technique of ESO, a new...
This paper analyzes the effects of the load torque oscillations in the signals of current and external stray flux and verifies that the characteristic signatures of this fault are clearly present even in an inverter-fed induction motor. In addition, a method based on the Linear Discriminant Analysis and on the calculation of the first odd harmonics of these signals is proposed for an automatic detection...
Induction motors are the most commonly used prime-movers in industrial applications. Many induction motors supplied by frequency converters are coupled with a physical angular rotor position/velocity sensor which makes the drive complex and require maintenance. This paper presents a sensorless control structure to avoid using a physical angular rotor position/velocity sensor. The proposed method estimates...
In order to reduce the speed overshoot of the traditional PI speed controller in direct drive permanent magnet synchronous motor(DD-PMSM), a novel speed controller is presented in this paper. In addition, a reduced-order load torque observer is proposed to reduce the effect of load torque changes and other disturbance factors on the system performances. The observed torque is imported to the input...
Aiming at the problem of existing larger speed fluctuation when the variable frequency air conditioning compressor running at low frequency, the reason of speed fluctuation in the low speed range for compressor is analyzed thoroughly in this paper, a speed fluctuation suppression strategy for the air conditioning compressor is proposed. Firstly, the periodic speed pulsation of compressor is reduced...
Gyrowheel is a unique attitude control device to measure external rates of the spacecraft body as well as provide momentum control. To ensure the external rate sensing accuracy of Gyrowheel, study of the accurate characterization of the currents in the torque coils is performed in this paper. Components of the current signals and the sources of them are analyzed, and an effective filtering method...
Although three million people around the world suffer from the lack of one or both upper limbs 80% of this number is located within developing countries. While prosthetic prices soar with technology 3D printing and low cost electronics present a sensible solution for those that cannot afford expensive prosthetics. The electronic and control design of a low-cost prosthetic hand, the Touch Hand II,...
This paper proposes an auto-tuning flux-weakening control for an IPMSM drive system. A predictive controller is implemented to enhance the dynamic responses of the proposed drive system, which yields improved overall transient responses, superior load responses, and good tracking responses. In addition, an on-line, auto-tuning flux-weakening control is implemented to control the IPMSM drive system...
In this paper a position sensorless control applied to a synchronous reluctance machine for an industrial drive application is discussed. For a given stator of an induction machine a synchronous reluctance rotor with flux barriers is designed by finite element methods and a prototype machine is built up. In this application the synchronous reluctance machine drive has already replaced the induction...
A motor is designed and tested for the MIT Robotic Cheetah project. The robot presents unique motor design challenges as it contains eight separate motors with different drive cycles, each consisting of short duration large torque commands followed by periods of lesser torque requirement. The ratio between maximum torque and rated torque is approximately 10:1. A design was selected through use of...
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