Abstract
In the field of sensorless drive of synchronous machines (SMs), many techniques have been proposed that can be applied successfully in most applications. Nevertheless, these techniques rely on the measurement of the phase currents to extract the rotor position information. In the particular case of low-power machines, the application of such techniques is challenging due to the limited bandwidth of the available current sensors. An alternative is offered by those techniques that exploit the star-point voltage rather than phase currents. This work aims at providing a model of the dynamic behavior of the star-point voltage and presenting a technique for extracting the rotor electrical position needed for sensorless operation of SMs. Two different circuitries for measuring the star-point voltage are also presented and then compared. The presented mathematical analysis and the measurement methods are validated both numerically and experimentally on a test machine.
Highlights
IntroductionIn order to pursue such features, DC motors tend to be replaced in most application fields by synchronous motors (SMs) in advanced drive systems, such as permanent magnet synchronous motors (PMSMs), synchronous reluctance motors (SRMs) as well as PM-assisted synchronous reluctance motors (PM-SRMs)
In the field of electrical drives, there is an increasing demand for highly integrated and compact driving solutions where performance is preserved or improved while costs and size are minimized.In order to pursue such features, DC motors tend to be replaced in most application fields by synchronous motors (SMs) in advanced drive systems, such as permanent magnet synchronous motors (PMSMs), synchronous reluctance motors (SRMs) as well as PM-assisted synchronous reluctance motors (PM-SRMs).To drive these machines, position information is required
The PMSM has been coupled to a servomotor that is used to impose a rotation of 1 revolution per minute (RPM) to the PMSM to measure Γ abc by means of direct voltage measurement (DVM) and fast resettable integrator circuit (FRIC) in almost standstill conditions
Summary
In order to pursue such features, DC motors tend to be replaced in most application fields by synchronous motors (SMs) in advanced drive systems, such as permanent magnet synchronous motors (PMSMs), synchronous reluctance motors (SRMs) as well as PM-assisted synchronous reluctance motors (PM-SRMs). To drive these machines, position information is required. Position sensors are typically installed for operating SMs, such as resolvers or encoders, which lead to an increase in cost, space requirement, and system complexity It is, desirable to provide techniques, which allow the operation of SMs without having to resort to the use of position sensors. The proposed sensorless techniques rely mainly on the exploitation of two physical effects: induced back-EMF (electro motive force) and the presence of machine anisotropies
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