Tài liệu High Performance Driver P5b docx

... HIGH PERFORMANCE DRIVES  E Levi, 2001 57 applied through a rate-of-change limiter. Load torque ... (s) e ds i e qs e e e T ,T =i i =i * qs * ds Fig. 3.14 - Reversing transient of the drive of Fig. 3.9. HIGH PERFORMANCE DRIVES  E Levi, 2001 60 interest here). Speed command equals 600 rpm and is constant. ... flux space vector estimation and erroneous orientation of stator current...

Ngày tải lên: 26/12/2013, 01:17

... drive. 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. Additionally, higher ... voltages into (2.28) for each of the six sixty degrees intervals produces the following result: HIGH PERFORMANCE DRIVES  E Levi, 2001 37 is still in the second sextant, while t =12...

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 48 where σ =−1 2 LLL m s r /( ) is the total leakage coefficient. ... zero. This simplifies Eqs. (3.16) since they become eLi e L L drsqs qr s m r =− = ω σ ωψ (3.17) HIGH PERFORMANCE DRIVES  E Levi, 2001 43 in time and cannot be ever fully satisfied in reality. ... current references. Recall that the same was said in Chapter 1 in conjunction...

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 51 position of the rotor flux space ve...

Ngày tải lên: 26/12/2013, 01:17

... HIGH PERFORMANCE DRIVES  E Levi, 2001 65 TP L L iP L L ii ii ii i i en m r rn qsn m r dsn qsn dsn ... only when the stator q-axis current command is exactly equal to its rated value. From (3.33) 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 * i α s * i a * i a 1/ L m 2C R j φ r e i b * P i b e...

Ngày tải lên: 23/01/2014, 06:20

... 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 ... mated pair of connectors. white paper High Performance Connectors ADC works to continuously improve its products and processes with respect to quality and performance. Specifically,...

Ngày tải lên: 10/12/2013, 19:15

... it is skewed, and a skew model must be used. As aforementioned, in performance modelling, when it is skewed, we normally assume it is highly skewed with θ D 1:0. Therefore, we use an equation similar ... distributes the work to the slaves. The aim is to make all slaves busy at any given time, that is, the High- Performance Parallel Database Processing and Grid Databases, by David Taniar,...

Ngày tải lên: 21/01/2014, 18:20

... memory) size, the fewer number of passes taken to sort a file, resulting in performance gain. Table 4.1 illustrates how performance is improved when the number of buffers increases. In terms of ... desired information is often split during the design as a result of the normalization process. High- Performance Parallel Database Processing and Grid Databases, by David Taniar, Clement Leun...

Ngày tải lên: 21/01/2014, 18:20