Abstract
In this paper, the drawbacks of the conventional f-t frame based maximum torque per ampere (MTPA) control schemes are analyzed and mathematically proved. In order to inherit the merits of both the direct flux vector control (DFVC) in field weakening region and field orientated control (FOC) in constant torque region while avoiding their disadvantages, an integrated control scheme is proposed. The proposed control scheme integrates the FOC into f-t reference frame at low speeds to achieve a relatively accurate and robust MTPA control, while at high speeds, the DFVC is adopted to utilize the advantages of f-t frame based control scheme in field weakening region. A shape function is utilized by the proposed control scheme to achieve a smooth transition between the two control schemes. The proposed control scheme is verified by experiments under various operation conditions on a prototype IPMSM drive. The simulation and experimental results illustrate that the proposed control scheme could achieve a better MTPA control accuracy in constant torque region and a better field weakening performance in the constant power region. Meanwhile the complex look-up tables for FOC in field weakening region and the difficulties in observing flux vector at low speed are avoided.
Highlights
Interior permanent magnet synchronous machines (IPMSM) have many attractive advantages such as high efficiency, high power/torque density [1]–[3], high reliability and good fieldweakening performance [1], [4], it has been used in plenty of industrial applications, such as robot motion control, electric vehicles and other industrial fields [5], [6]
For maximum torque per ampere (MTPA) operation and the advantages of f-t frame based control schemes for filed weakening operation while avoiding their weaknesses, an integrated control scheme is proposed in which field orientated control (FOC) is employed at low speed (MTPA control) and the direct flux vector control [13], [22], [23], a kind of f-t frame based control scheme, is adopted at high speed
This paper proposed a novel integrated control scheme which combines FOC scheme with direct flux vector control (DFVC)
Summary
Interior permanent magnet synchronous machines (IPMSM) have many attractive advantages such as high efficiency, high power/torque density [1]–[3], high reliability and good fieldweakening performance [1], [4], it has been used in plenty of industrial applications, such as robot motion control, electric vehicles and other industrial fields [5], [6]. The f-t frame based control schemes are robust to dc-link voltage variations in field weakening region and can directly impose the stator flux amplitude limit, they have a better performance than the FOC in field weakening region [12]. The FOC is adopted, whereas at high speeds, the direct flux vector control (DFVC) scheme [13], [22], [23], [27] is employed as a kind of f-t frame based control scheme In this way, the proposed control scheme could achieve a better efficiency optimization control accuracy in constant torque region and a better field weakening performance in constant power region.
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