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This paper describes sensitivity analysis to q-axis inductance variation of the position estimation using Extended Electromitive Force (EEMF) excited by High Frequency (HF) signal injection based on the mathematical formula evaluation, and it shows that the influence on the q-axis inductance variation is very small. Finally, experimental results indicate that position estimation can be performed well...
Several position sensorless control methods of IPMSMs(Interior Permanent Magnet Synchronous Motors) using the observers have been proposed. In case of the full-order observers, these designs are difficult, because the order of the error equations of the observers becomes four. In this paper, for the position sensorless control of IPMSMs, a design method of the full-order observer based on the extended...
Synchronous reluctance motors (SynRMs) have attracted studies, because SynRMs have no magnets in the rotors. The position sensorless control at low speeds of SynRMs is now desired, and several methods have been proposed. In this paper, by using the high-frequency current control system, a new position sensorless control method of SynRMs at low speeds by superimposing high-frequency current whose amplitude...
Synchronous reluctance motors (SynRMs) have attracted attention, because SynRMs have no magnets in the rotor. Position sensorless control at low speeds of SynRMs is now desired, and several methods have been proposed. The new position sensorless control method of SynRMs at low speeds by estimating a high-frequency extended e.m.f.(EEMF) caused by superimposed high-frequency current has been proposed...
A flux model, which is capable of both MTPA(Maximum Torque Per Ampere) control and position sensorless control of IPMSMs(Interior Permanent Magnet Synchronous Motors), has been proposed. This paper proposes that the flux is estimated using the full-order observer. And a design method for the full-order observer is also proposed. The design method of the full-order observer that robust flux estimation...
This paper proposes a new method for the advanced angle estimation of block-commutation controlled IPMSM with DC-bus current measurement. The block commutation drive for IPMSMs would be an attractive method to achieve both high efficiency and high power density drives. In this paper, the equivalent SPMSM mathematical model of IPMSMs including the principle of the reluctance torque development is employed...
Synchronous reluctance motors (SynRMs) have attracted attention as the motor which complement IMs and IPMSMs, etc., because SynRMs have no winding and magnet in the rotor. Position sensorless control at low speeds of SynRMs is now desired, and several methods have been proposed. This paper proposes a new position sensorless control method of SynRMs at low speeds by estimating a high-frequency extended...
Recently, the IPM motors for driving the compressors of the air-conditioners use often the rare-earth magnet. Soaring prices of it, however, is becoming serious problem. In this paper, a new IPM motor, which the use of rare earth magnet is reduced with pay attention to the demagnetization, is proposed. The experimental results show that the proposed motor is very useful.
In the world, 50 million air-conditioners are set up every year. It is important to save the power consumed by air-conditioners. Therefore, the price of IPM motors has to be reduced. The price of IPM motors decreases if the cost of the material of the IPM motors decreases through decreasing the size of the IPM motors. In this paper, the smallest IPM motor whose stator outer diameter is 90 mm for compressors...
The reduced order observer (disturbance observer) based on the the extended electromotive force(eemf) model, which can be applied to the position and velocity sensorless control for all synchronous motors included IPMSMs(Interior Permanent Magnet Synchronous Motors), had been proposed by authors. However, the design of a full-order eemf observer is difficult, because the error equations of the observers...
Recently, synchronous reluctance motors (SynRMs) have attracted study because of their favorable properties, including limited thermal expansion of the shaft due to low heat generation by the rotor, the ability to drive at high velocity, a low degree of torque ripple and an absence of demagnetization problems. Sensorless control of SynRMs is now desired, and several methods have been proposed. These...
This paper proposes fast initial position estimation of IPMSMs (Interior Permanent Magnet Synchronous Motors), which is based on intentional pulse voltage injection and comb filters. Most initial position estimation methods utilize the amplitude or differential values of high-frequency currents and the performance of sensorless control depends on the algorithm to reconstruct these values. Although...
Several position sensorless control methods of PMSMs(Permanent Magnet Synchronous Motors) using the full-order observers have been proposed. However, the designs of the full-order observers are difficult, because the error equations of the observers become one of the fourth order. On the other hand, the the extended electromotive force(eemf) model which can be applied to all synchronous motors included...
This paper proposes the fast initial position estimation of IPMSMs (Interior Permanent Magnet Synchronous Motors), based on intentional pulse voltage injection and comb filters. Generally, the rotor position can be estimated by detecting high-frequency current caused by injected high-frequency voltage because its response includes inductance information due to saliency. In general, sinusoidal current,...
Recently, synchronous reluctance motors (SynRMs) have attracted study because of their favorable properties, including limited thermal expansion of the shaft due to low heat generation by the rotor, the ability to drive at high velocity, a low degree of torque ripple and an absence of demagnetization problems. Sensorless control of SynRMs is now desired, and several methods have been proposed. These...
So far a lot of sensorless control methods have been proposed for permanent-magnet synchronous motors (PMSM). However, application which require the response at transition is limited in current methods, and the expansion of coverage of sensorless control is requested. In this paper, an extended flux is defined and minimal order observer estimating it is proposed. Then, the poles of the minimal order...
This paper proposes an algebraic design of a full-order observer for position sensorless control of Interior Permanent Magnet Synchronous Motors (IPMSMs). First, this paper describes the proposed flux model for position sensorless control of IPMSMs, which can approximately estimate maximum torque control frame. Next, this paper proposes an algebraic design of full-order observer based on the proposed...
A full-order extended electromotive force (eemf) observer for sensorless control of IPMSM and a design method of one have been proposed. This paper proposes a new design method of the full-order eemf observer by taking a new look at the error system of one. The simulation results show that a new design method of the full-order eemf observer is very useful.
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