2.8. ESTANDAR JAPONES CON VARIACIONES BRASILEÑAS ISDB-Tb
2.8.5. Codificación de video, audio y datos
Fig. 6-10. 4 phase split-link converter for a switched reluctance motor.
A 4 phase split-link converter (as in Fig.6-10) was constructed for a 4kW 4 phase switched reluctance motor. In the experiments, the load was a lkW, separately excited, d.c. generator. The input d.c. voltage to the power converter was adjustable, up to a maximum value of + 300 V and the maximum peak phase current was limited at 25 A to protect the drive system. As described in Chapter 5, the load phase power could be controlled to track the command value. Fig. 6-11(a) is the current and voltage waveform o f phase- 1 and phase-2 obtained when the motor was unning at 500 r/min. Fig. 6-11(b) is the waveforms of phase-3 and phase-4 obtained when the motor was running at the same operating point. Fig. 6-11(c) shows the waveforms of total sum of all phase currents when running at the same operating conditions. In Fig. 6-11(d), similar waveforms were obtained throughout period of regeneration. In Fig. 6-12, some similar results were obtained, running at 2380 r/min. Figure 6-13 are some
experimental results which demonstrate the control performance of total phase power, running at 500 r/min, 2380 r/min and at the other uncertain speed, respectively, when the motor was braked and then the motor was running from zero speed, 500 r/min, to 2380 r/min during a reverse rotational state. These experimental results show that total sum of all phase currents was an approximate constant no matter whether the speed was low, high or under regenerative conditions.
T e k l o o k s / s 2 A cqs
---*---
• ... ...
Tin— nnrv M fljf i e:<H.O'mP---Mî.SOh's T h l I Z/S'O tf
C h 3 2 .0 0 V C M 2 . 0 0 V
Fig. 6-11(a) Phase current and phase voltage waveforms during motoring state. C hi: phase-1 current, 10 A/div; Ch2: phase-2 current, 10 A/div; Ch3: Phase-1 voltage, 400 V/div; Ch4: phase-2 voltage, 400 V/div. Time : 2.5 ms/div.
T e k a ü jg g i o o k s / s 6 A c q s
i--- T---1
Fig. 6-11(b) Phase current and phase voltage waveforms during motoring state. Chi: phase-3 current, 10 A/div; Ch2: phase-4 current, 10 A/div; Ch3: Phase-3 voltage, 400 V/div; Ch4: phase-4 voltage, 400 V/div. Time : 2.5ms/div.
T e k a u r a 10 0 k S / s 9 A c q s [---?---1 ' » ’ t ! !— — r^— ' ‘ . 1 ! ' "~ ~ l---; ! 1 ! ; j .... j .... j .... j ... J — : — : — . : • . • • -■ ■ ■ T • ■ J ■
TIÏT S oo v ¿hi $oomv
ch3 lo.omv OUDD i.oov MJ.Soms Cut / 2.3 v
Fig. 6-11(c) Phase current and phase voltage waveforms during motoring state. C hi: total som of all phase currents, 12.5 A/div; Ch2: d.c. link current, 5 A/div; Ch3: phase-1 current, 10 A/div; Ch4: shaft speed, 500 r/min. Time: 2.5 ms/div.
T e k Q E J3 1 o o k S /s 154 Acq s
_________ t— .... ...-T--- --- ]
QE________ ______ I_______ .___________
CfTl 5 . 0 0 V CTT5 5 0 0 m V M 2 . 5 0 m s C h i f 2 3 v '
Ch3 lO.Omv B IB 1.00 V
Fig. 6-11(d). Phase current and phase voltage waveforms during regenerative state. Chi: total som of all phase currents,12.5 A/div; Ch2: d.c. link current, 5 A/div; Ch3:phase-1 current, 10 A/div; Ch4: shaft speed, 500 r/min. Time: 2.5 ms/div.
Fig. 6- 12(a) Phase current and phase voltage waveforms during motoring
state. Chi: phase-1 current, 10 A/div; Ch2: phase-2 current, 10 A/div; Ch3: Phase-1 voltage, 400 V/div; Ch4: phase-2 voltage, 400 V/div. Time: 1 ms/div.
T e k a n a 2 5 0 k S /s 20 Acqs
i---T---1
Fig. 6- 12(b) Phase current and phase voltage waveforms during motoring
state. Chi: phase-3 current, 10 A/div; Ch2: phase-4 current, 10 A/div; Ch3: Phase-3 voltage, 400 V/div; Ch4: phase-4 voltage, 400 V/div. Time: Ims/div. T e k B o n i 2 S 0 k s / s 2 A cq s _______________ I T H . i /Nfc- i ■ ■ ■ i
f.
• ■ i ■ . ■ ■ ' : : : : : i : : : : : m H l M l l l f f l l i ^ M l f l - u f f t i i n n r T O JTEE 2.00 v dni 16 omv
__ r n t T H T f l i i l l i M 100ms tn l
I
2 52 VC1Ï3 2 .0 0 V Ch4 2 .0 0 V
Fig. 6- 12(c) Phase current and phase voltage waveforms during motoring
state. C hi: phase-1 current, 10 A/div; Ch2: phase-2 current, 10 A/div; Ch3: Phase-1 voltage, 400 V/div; Ch4: phase-2 voltage, 400 V/div. Time: lms/div.
s o . o k s / s ________h- 17 A c q s ---- T--- ■ A A J Î A A J 2 . 0 0 V C h 4 2 .0 0 V
Fig. 6- 12(d). Phase current and phase voltage waveforms during regenerative
state.Chl: phase-1 current, 10 A/div; Ch2: phase-2 current, 10 A/div; Ch3: Phase-1 voltage, 400 V/div; Ch4: phase-2 voltage, 400 V/div. Time: 5 ms/div.
Fig.6-13(a). Current and phase voltage waveforms at 500 r/min. C hi: total som of all phase currents,12.5 A/div; Ch2: d.c. link current, 5 A/div; Ch3:phase-1 current, 10 A/div; Ch4: shaft speed, 500 r/min. Time: 25 ms/div.
Fig. 6-13(b). Current and phase voltage waveforms at 2380 r/min.Chl: total sum of all phase currents, 12.5 A/div; Ch2: d.c. link current, 5 A/div; Ch3: phase-1 current, 10 A/div; Ch4: shaft speed, 2400 r/min. Time: 1 ms/div.
T a k Q E Ü S I 0 . 0 k s / S 2 3 A c q s
f ---r---1
5 :6 8 V ' £ h 5 — i .8 8 V~ ' M i 5 .6 m s C h i 1---“T T V
lO .O m V C h 4 2 . 0 0 V
Fig. 6-13(c) Phase current and phase voltage waveforms during the transition from high speed to low speed state. Chi: total sum of all phase currents, 12.5 A/div; Ch2: phase-1 current, 10 A/div; Ch3:phase-2 current, 10 A/div; Ch4: phase-1 voltage 400 V/div. Time: 25 ms/div.
Fig. 6-14. Step shaft speed response from start to command speed (2860 r/min). C hi: The total sum of all phase currents, 12.5 A/div; Ch2: d.c. link current, 5A/div; Ch3: Phase voltage, 400 V/div; Ch4: shaft speed, 5714 r/min/div. Time: 250 ms/div.
Fig. 6-15. Shaft speed response from reverse rotational state (2060
r/min) to forward rotational state (2285 r/min). Chi: The total sum of all phase currents, 12.5 A/div; Ch2: d.c. link current, 5A/div; Ch3: Phase voltage, 400 V/div; Ch4: shaft speed, 5714 r/min/div. Time:250 ms/div.
In order to demonstrate the excellent speed servo performance, quicker step speed response and speed tracking experiments were performed and are showned in the Fig. 6-14 and Fig. 6-15. Figure 6-14 shows the result which is operated under 300 V and 4 A d.c. link source current. In this figure, channel one is total sum of four phase currents, channel two represents the waveform of d.c. link current, channel three
represents the waveform of phase- 1 voltage, and channel four represents the
waveform of shaft speed, which tracked the demanded speed (2860 r/min) from start. It can be seen that the step speed response time was around 300 ms under overloading (rated power 500 W). Figure 6-15 is the experimental result which resulted operation is under 300 V and from 2060 r/min (command speed : 2000 r/min; revese rotation) to 2285 r/min (command speed: 2300 r/min; forward rotation). It can be seen that the response time was quick, about 400ms. These results that the drive with space vector and sliding mode speed controller was far away superior to the existing switched reluctance drive and an excellent speed servo perfomce has been achieved.