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In this paper, a novel model reference adaptive (MRA) based speed and rotor position estimation strategy is proposed for the surface mounted permanent magnet synchronous motor (SPMSM). In the proposed strategy, a new adaptive law is proposed by considering the MRA adaptive law as a controller. Furthermore a parameter self-turning strategy and a speed compensation strategy are proposed to improve the...
This research analyzes the vibration phenomenon in certain types of fractional slot permanent magnet synchronous machines that excites low order radial forces. The study utilizes a motor topology from the group having 12-stator slots and 10-rotor poles (12s10p) to identify and propose several design-based solutions to reduce vibration. Some electromagnetic design feature variations in the motor geometry...
Referring to a 4-wheel drive Formula Student Electric vehicle, a fractional-slot synchronous permanent magnet machine has been designed. Torque density has been improved adopting outer rotor topology and lightweight materials. An ironless rotor with PMs placed in an Halbach array configuration allows reduced rotor inertia to be obtained. The results described in the paper provide a quantitative assessment...
Propulsors with outboard drives (PODs) are propeller propulsion units situated under the hull of a marine vessel. They contain an electric motor which is directly connected to the propeller. With the absence of the gearbox, higher efficiency, lower noise and vibration can be achieved. Presently, the wound rotor synchronous motors dominate a large share of the podded propulsion market due to their...
This paper investigates two methods of self-sensing rotor position estimation based on signal injection for a homopolar synchronous motor. The magnetic anisotropy of the machine can be utilized for rotor position estimation, which can exclude a position encoder from the system in order to increase reliability of the drive. The stator response observer was tested and the field response observer was...
Based on previous research experience proved by simulated and experimental results a comparative discussion about advantages and disadvantages of using Vector Control or Direct Torque Control for PM-SM drives is presented.
This paper deals with performances of the two cylindrical permanent magnet synchronous motors (PMSM) identical from the point of view of geometrical dimensions but with different stator windings and PM materials. Motor A has fractional slot concentrated winding and rotor with ferrite magnets and motor B has distributed windings and rotor with NdFeB magnets. Parameters and performances of both motors...
Double Excited (or Hybrid Excited) Synchronous Motors (DESM or HESM) has gained great interest as they have the ability to control the air-gap field, and consequently the electrical drive speed due to the auxiliary excitation winding. To obtain the magnetic field distribution in the air gap many techniques are used. The Schwarz-Christoffel (SC) mapping allows the mapping of the slotted structure of...
In this paper robust nonlinear observer and controller are designed for sensorless control of interior permanent magnet synchronous motor (IPMSM). The proposed method is based on the high order sliding mode technique. The super twisting algorithm is combined with an interconnected observer which allows using it in multi-input multi output case. The proposed controller computed using the MTPA strategy...
In this paper, a robust and an efficient tracking controller based on model reference adaptive system (MRAS) technique is performed for mobile robot in order to get the accurate trajectory tracking performance. The model reference adaptive system (MRAS) technique has been presented so as to achieve the estimated value of system's speed information. To estimate the rotor position and speed of the mobile...
Based on double PWM structure, this paper analyzes the energy relationship between each part of the system according to the system energy flow in balanced energy state and unbalanced energy state and builds the energy mathematic model of double PWM. In order to solve the problems of DC bus voltage fluctuation and the mismatch in system output power and the motor power caused by the imbalance between...
The paper deals with the vector control of two surface-mounted permanent-magnet (PM) synchronous-motors in configuration “single-inverter dual-motor”, operating also with unbalanced loads. Since this structure is justified by the objective of obtaining low cost drives, a low computation burden sensorless method is proposed in order to further reduce the system complexity. A very simple algorithm for...
The paper presents a control scheme for the sensorless induction motor that yields the estimates of the fluxes, motor speed and inverse of the rotor time constant. The motor is field-oriented using Direct Field Orientation — the stationary frame fluxes are obtained from a combined Current and Voltage Model Observer. The speed is obtained from a flux-based MRAS sliding mode observer. More importantly,...
This paper presents a scheme for rotor position estimation from standstill to nominal speed for slotless surface mounted permanent magnet synchronous motors, which do not contain structural anisotropy. At standstill and very low speed, the position is estimated by signal injection, while the rotor polarity is identified by a special process based on the estimation of the back electromotive force (back-emf)...
Motor current measurement techniques as well as predictive control algorithms for electric drives rely on an assumption of linear motor currents changes resulting from constant inverter output voltages. Recent research has reported that this assumption does not hold in motors with short electrical time constant, and in drives whose rotor position advances substantially during a control period. This...
This paper presents a sensorless starting procedure for a soft starter driven IE4 direct on line permanent magnet synchronous motor (PMSM). First, the initial position of the rotor is determined using a pulsating current space vector. Subsequently, the motor is started from standstill by the soft starter from a known position. The following firing sequences are calculated on the basis of the flux...
Electrically Excited Synchronous Motor (EESM) serves as an option on hybrid vehicle applications. An EESM for mild hybrid application is designed in this study. Copper loss minimization and field current minimization are analyzed for current control strategies of EESM. Both of the current control strategies are applied and comparisons between the two are made thereafter. In both of the strategies,...
A new sensorless direct torque control method for PM-Assisted synchronous motor drives is proposed in this paper. The stator flux linkage amplitude and electromagnetic torque are the two controlled variables which are regulated in stator flux frame. Unlike the two most conventional sensorless methods at low speeds, high frequency (HF) rotating carrier voltage injection into stationary reference frame...
A calculation of the high frequency machine capacitances is presented and compared with measured bearing currents of a small outer rotor 2.4 kW-fan PM synchronous motor with a tooth-coil winding. The integrated two-level voltage-source, 16 kHz switching frequency IGBT inverter, operates at Fdc = 540 V DC link voltage. Due to the small size of the motor no circulating bearing currents can occur, but...
In this paper, we evaluate an effect of space factor of motor core on torque characteristics by using an interior permanent magnet synchronous motor (IPMSM). 2-D magnetic field analysis changing the space factor of motor cores and current phase angle is carried out to clarify the effect of space factor. The results show that torque has a peak value in 76% space factor even if current phase angle is...
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