Tài liệu High Performance Driver P5a pptx

... HIGH PERFORMANCE DRIVES  E Levi, 2001 50 regarded as constant). Equations derived for the current-fed ... fixed sensors are used in the air-gap of the machine, displaced by 90 degrees). Magnitude and HIGH PERFORMANCE DRIVES  E Levi, 2001 51 position of the rotor flux space vector can then be obtained ... (2.24)-(2.26), together with flux linkage equations (2.21), suggests the fo...

Ngày tải lên: 26/12/2013, 01:17

... (2.56). Additionally, transition from one vector to the other takes place at much higher frequency than the HIGH PERFORMANCE DRIVES  E Levi, 2001 32 output frequency and each vector is utilised ... the HIGH PERFORMANCE DRIVES  E Levi, 2001 35 inverter is now capable of controlling both the frequency and the rms value of the fundamental component of the output voltage. Additional...

Ngày tải lên: 26/12/2013, 01:17

... the considerations of this sub-section and discussion of high performance DC motor drives, the following statements can be made: • High performance operation requires that the electro-magnetic ... the motor is highly oscillatory during the transient. It even takes negative values in some instants, during which the speed reduces rather than increases. Recall that in a high performan...

Ngày tải lên: 26/12/2013, 01:17

... direct stator flux oriented control in high speed and field-weakening region (the notions of indirect and direct vector control will be explained shortly). HIGH PERFORMANCE DRIVES  E Levi, 2001 50 regarded ... HIGH PERFORMANCE DRIVES  E Levi, 2001 41 3. ROTOR FLUX ORIENTED CONTROL OF INDUCTION MACHINES 3.1. ... fixed sensors are used in the air-gap of the machine, displaced by...

Ngày tải lên: 26/12/2013, 01:17

... HIGH PERFORMANCE DRIVES  E Levi, 2001 56 v qs * v ds e φ r j ω φ r i i i a b c * v v * * α β s s v qs ' v ds ' - i ds * qs i * ω * - ω P+I - P+I P+I i ds * i qs * ω r * L s L σ s qs i ds i - + e -j ... rotor flux is established in the machine, speed command equal to −40 % of the rated speed is HIGH PERFORMANCE DRIVES  E Levi, 2001 57 applied through a rate-of-change li...

Ngày tải lên: 26/12/2013, 01:17

... HIGH PERFORMANCE DRIVES  E Levi, 2001 63 Summarising the procedure: speed loop is held open, d-axis ... constant: () () LX LX LLL TLR mm rr rmr rrr === === =+= == = 2 50 132 100 0 42 2 50 12.6 100 0 04 046 046 63 73ms π π ππ γγ γ /. /. . ./. H H H HIGH PERFORMANCE DRIVES  E Levi, 2001 64 ψ r * i ds * T r s 1/ L m T e * 2 L r i qs * 3 PL m ω sl * ω r φ r e L r 1/ s ω ψ r * i ds *...

Ngày tải lên: 23/01/2014, 06:20

... analyzing the performance using them the user can locate the program area in which a performance problem lies. Correcting these problems can improve the program performance. Figure 9 shows performance ... the achievable theoretical peak performance from the basic performance character- istics of an architecture such as memory bandwidth and peak performance. If performance is lim...

Ngày tải lên: 24/12/2013, 19:15

... Erlangen-N¨urnberg, Cauerstraße 4, D-91058 Erlangen, Germany, {kberonov,durst,noezyilm}@lstm.uni-erlangen.de, 2 High Performance Computing Center Stuttgart (HLRS), Nobelstraße 19, D-70569 Stuttgart, Germany Abstract ... is presented in Fig. 4. It is clear that substantially higher Re than the maximal one showninthatFigure,Re τ ≈ 640, are required in order to quantify the high- Re asympto...

Ngày tải lên: 24/12/2013, 19:15

... gen- erality, we consider queries that involve only one aggregate function and a single join. High- Performance Parallel Database Processing and Grid Databases, by David Taniar, Clement Leung, ... table S in each processor is carried out after the distribution phase. Several things need to be highlighted from this scheme. ž First, the grouping is still performed before the join (although ....

Ngày tải lên: 21/01/2014, 18:20