The sensorless rotor position identification and low speed operation of the axial flux permanent magnet motor controlled by the novel PIPCRM method

The paper presents a simple sensorless method, which can be used to determine poles position of a permanent magnet axial flux motor. Described method is related to impact of a back electromotive force on current shape produced when a zero voltage vector is applied. A goal of this method is poles position detection for speed range from 2% of nominal speed of the motor. The goal of zero voltage vector method is fulfilling gap between method for initial position detecting e.g. PIPCRM and simple back electromotive force estimation method. Presented method has been tested on experimental set using 40 kVA / 16 poles / 3000 rpm axial flux permanent magnet motor.

show abstract

“…It can be seen that time of the position test is lower than 200 µs. In comparison to the PIPCRM position test [5], it is five time less.…”

Section: Laboratory Resultsmentioning

confidence: 90%

“…An achievement of researches is previously presented PIPCRM method [5]. This method can be used to detect only an initial rotor position.…”

Section: Laboratory Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Sensorless position identification of permanent magnet motor by zero voltage vector

Wiśniewski

Koczara

2011

2011 7th International Conference-Workshop Compatibility and Power Electronics (CPE)

Self Cite

View full text Add to dashboard Cite

show abstract

“…Recent researches show that such solution is not optimal, because when the speed goes up the t DRIVE should be decreasing. In other case, the drive system won't be able to achieve given speed [9]. Explanation requires introducing of n IMP parameter, which represents number of position tests per 360 electrical degrees.…”

Section: Control At Standstill and At Low Speedmentioning

confidence: 99%

Sensorless control of the axial flux permanent magnet synchronous motor at standstill and at low speed

Wiśniewski

Koczara

2009

2009 Compatability and Power Electronics

Self Cite

View full text Add to dashboard Cite

The paper presents a simple sensorless method, which can be used at standstill. Therefore method can be used to determine initial poles position of the axial flux permanent magnet motor. Moreover presented method can yield rotor position at low speed. An appropriate speed range for the method is limited. The paper shows the way of extend that speed range. Identification of rotor position is provided by current responses which are result of the single test voltage step. This paper deals with theory of the method confirmed by laboratory results on experimental set with 40 kVA / 16 poles / 3000 rpm axial flux permanent magnet motor.

show abstract

“…In such a case of operation, in many applications there is a need to introduce a special control algorithm [12,13], as well as the use of a sensorless control. It is assumed that position estimation based on the back electromotive force (EMF) does not have sufficient accuracy at lower speed range [14,15]. In such case other methods are used, e.g., using injection of additional test signals [16,17].…”

Section: Introductionmentioning

confidence: 99%

A new sensorless speed control structure for PMSM using reference model

Urbański¹

2017

Bulletin of the Polish Academy of Sciences Technical Sciences

View full text Add to dashboard Cite

Abstract. In the paper a new sensorless control structure for the PMSM drive is presented. Such a structure is especially recommended for speed in the range of single revolutions per second (excluding standstill). The method uses a back EMF observer for position estimation. However, there is no need to estimate the speed. This is a big advantage because of possible irregularity of estimated back EMF in this speed range, which makes the calculation of speed difficult or impossible. The proposed structure is similar to the model following control, but the reference model attempts to track the motor operating point. The main idea is to utilize as a reference a model of the whole drive, including speed and current controllers and motor model. Such a model produces reference voltage for the real inverter. However, an extra unit -called rotator -is needed to provide precise control of direct axis current, which is sensitive to the improper position of the voltage vector. The rotator acts as a kind of compensator for error of position estimation. range. This is confirmed by experimentally obtained waveforms shown in Fig. 1 and Fig. 2. This is the idle speed, using a constant value of reference current on q axis. These waveforms were obtained for a traditional field oriented control (FOC) method of the PMSM (using a similar structure as is shown in Fig. 4), with a cascade control structure using a closed speed control loop (which was disconnected for the test) with inner current control loops containing separate controllers on d and q axes, rotating synchronously with the rotor. The overall structure of control utilizes the sine and cosine of the estimated position and calculated speed value instead of measured values.To obtain smooth output values from the observer, the reference voltage is used instead of measured ones. This simplification gives good results

show abstract

The sensorless rotor position identification and low speed operation of the axial flux permanent magnet motor controlled by the novel PIPCRM method

Cited by 11 publications

References 4 publications

Sensorless position identification of permanent magnet motor by zero voltage vector

Sensorless position identification of permanent magnet motor by zero voltage vector

Sensorless control of the axial flux permanent magnet synchronous motor at standstill and at low speed

A new sensorless speed control structure for PMSM using reference model

Contact Info

Product

Resources

About