Tài liệu High Performance Driver P3 doc

... 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

... (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

... 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

... 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

... pro- cessing skew in parallel sorting is a challenge without which performance degradation can be expected, especially when a high degree of skewness is involved. ž As a rule of thumb for selecting ... be adopted: Ž If processing skew degree is high, then use parallel redistribution merge-all sort. Ž If both data skew and processing skew degrees are high OR no skew,then use parallel pa...

Ngày tải lên: 21/01/2014, 18:20

... white paper High Performance Connectors ADC works to continuously improve its products and processes with respect to quality and performance. Specifically, ADC has made ... randomly intermated connector performance and is improved through an automated process. • What is the typical performance of un-tuned mated connectors in the field? Typical performance of non-tuned ... central o...

Ngày tải lên: 10/12/2013, 19:15

... a cluster of SMP’s which are interconnected by a high speed network switch, and each node comprises eight vector PE’s. In order to achieve high performance in such an architecture, the intra-node ... optical transition in higher energy region is also available in such nanotubes according to our first-principles calculation of dipole-matrix elements. We suspected that such high- energy e...

Ngày tải lên: 24/12/2013, 19:15