New block diagrams using vector signals in the general frame of reference for AC motors with stator core losses

Electrical Engineering Japan

2003

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SUMMARYSignal processing based on frequency polarity has been attracting wide attention due to its potential applications to industry. It is popular to employ two vector rotators for such signal processing. However, it has very recently been reported that an equivalent signal processing effect can be attained in a much simpler manner using two-input two-output filters in the D-module. This paper further investigates a class of characteristic-varying systems in the D-module, which contains the filters in the D-module as a special case, and gives new analytical results on their properties from the viewpoints of existence, realization, and stability. If the results are applied to filter problems, n-th order filters in the D-module in new forms can be easily and directly obtained, whose stability and response equivalent to the associated filters with vector rotators are guaranteed. If the results are applied to AC motor modeling problems, dynamic models and block diagrams of AC motors in general reference frame are easily and directly obtained. Very general and useful analyses are given for a newly proposed class of characteristic-varying systems in the D-module that have potential usefulness in various industrial applications including control of magnetic bearing system, analyses and active compensations of power systems, and sensorless drives of AC motors.

Section: Ac Motor Systemssupporting

confidence: 92%

“…ω 2n is electrical speed of rotor. The circuit equation in (25) can be expressed in the form of (3) such that If evaluated from the viewpoint of current controller for vector control, the induction motor turns out to be a kind of system with vector rotators, which can be shown as in Fig. 6(a) [24].…”

Section: Ac Motor Systemsmentioning

confidence: 99%

Characteristic‐varying systems in the D‐Module: Their properties of existence, realization, and stability

Electrical Engineering Japan

2003

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“…In the torque system, instead of torque equation (10) we use a simpler representation for AC motors based on stator flux linkage [25,[29][30][31]. In addition, the dynamic characteristic (43) of the mechanical load system (the system includes the rotor and a connected mechanical load) is expressed by using a first-order delay for simplicity.…”

Section: Type-a Vector Block Diagrammentioning

confidence: 99%

“…Such a block diagram in a fixed reference frame can be used immediately as a dynamic vector simulator for the SelE-HFSM [25,[29][30][31].…”

Section: Supplemental Considerationsmentioning

confidence: 99%

“…In addition, such a vector block diagram can be immediately used as an efficient dynamic vector simulator for the control system when the diagram is created by software that supports block diagram input. Vector block diagrams have been developed and used for induction motors, permanent-magnet synchronous motors, synchronous reluctance motors, and SepE-HFSM [25,[29][30][31].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Self‐excited hybrid‐field synchronous motors

2008

Elect Comm in Japan

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SUMMARYThis paper proposes a new well-organized dynamic mathematical model and new dynamic vector simulators for newly emerging self-excited hybrid-field synchronous motors (SelE-HFSMs) that have rotor field by both permanent magnet and diode-shorted field winding. The proposed new mathematical model has the following completeness and generality: (1) it consists of three consistent basic equations such as circuit, torque-evolution, and energytransmission equations; (2) it deals with pole saliency and contains nonsaliency as a special case; (3) it is a dynamic model and contains a static one as a special case; and (4) it is established in the general reference frame including the stator and rotor reference frames as special cases. The proposed new dynamic vector simulators are established in the form of a vector block diagram based on the new model. They have the following attractive features: (1) they succeed in realizing clear configurations with physically meaningful vector signals, which clearly show motor electromagnetic mechanism; (2) vector signals utilized as transfer signals between blocks are defined in the general reference frame; consequently, the simulators in the frame can be directly and easily reduced to the ones in the stator and rotor reference frames; (3) they are compact, and can be easily programmed by commercially available standard simulation software. Two typical and compact but sufficiently general dynamic vector simulators are newly presented. Validity of the model is verified analytically, and validity of the simulators is confirmed by numerical experiments.

A dynamic mathematical model and vector block diagrams for class of hybrid‐field synchronous motors

Electrical Engineering Japan

2005

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SUMMARYThis paper proposes a new dynamic mathematical model and new block diagrams for a newly emerging class of salient-pole hybrid-field synchronous motors (HFSM) that have rotor field by both permanent magnet and winding. The proposed mathematical model has the following completeness and generality. (1) It consists of three consistent basic equations such as circuit, torque, and energytransmission equations. (2) It deals with pole saliency and contains nonsaliency as a special case. (3) It is a dynamic model and contains a static one as a special case. (4) It is established in the general reference frame including stator and rotor reference frames as special cases. The proposed new block diagrams using vector signals for salient-pole HFSM are established based on the model. It has the following attractive features. (1) It succeeds in realizing clear configurations with physically meaningful vector signals, which are helpful for understanding motor electromagnetic mechanisms and useful for designing controllers for the salient-pole HFSM. (2) Vector signals utilized as transfer signals between blocks are defined in the general reference frame. Consequently, the vector-signal block diagrams in the frame can be directly and easily reduced to the ones in such a specific frame as stator and rotor frames. (3) It is compact. Two typical and compact but sufficiently general vector-signal block diagrams are newly presented.