3. Quiz on Electrical Drive Motors and Models 1. What types of motors have the single-sided excitation? -(linear) synchronous 2. What types of motors have the dc excitation? - 3. What types of motors have the permanent magnet excitation? -synchronous, DC 4. What types of motors have the dc supply? -DC, synchronous 5. What types of motors have the slip rings? -induction 6. What types of motors are the brushless motors? -DC, synchronous 7. What orthogonal reference frames do you know? -(,)stator; (d,q)rotor;(x,y)arbitrary 8. What natural reference frames do you know? -3 phase 9. What stationary reference frames do you know? -stator 10. Write the frequency equilibriums that you know. -induction:w1=w2+w12;synchronous:w1=w12;DC:w2=-w12 11. What is the result of the mutual motion of the stator and rotor windings? -torque??? 12. What variables does the flux depend on? -L12 I12? L ja I 13. Write the formulae of the synchronous speed. -2*pii*f1/p 14. Write the formulae of the motor speed.
· The motor torque is equal to P/ TL + Jd/dt · The cheapest and the most reliable is induction motor · The torque production is the result of interaction of current flux · Efficiency of the electrical drive is the power ratio of load to supply · The best electrical drive has efficiency very high · The torque is proportional to the current in dc motor · The inductor supplies the motor with flux · The armature supplies the motor with current · The mutual motion of the stator and rotor windings result in counter-EMF · If the angular frequency of the stator field is 300, how much the synchronous speed of the 2-pole motor will be 300 · The characteristics of the rigid drive is rigid · The rigidity of the high-efficient electrical drives is high · The standard supply grid has the oscillation period of 20 ms · Select the components that belong to the servo drive position sensor · The multi-quadrant operation is typical for car
the reversing operation? Which variables change their sign in the reversing operation? The reversing drive operates within two or four quadrants jumping from the first to the fourth or from the third to the second quadrants. Test III Select the motors with the slip rings: wound-rotor synchronous Select the motors with permanent magnet excitation: separate excited DC, ?? Select the natural reference frames: L1, L2, L3 Select the stationary reference frames: alfa, beeta If the stator field frequency is 100, what will be the synchronous frequency of the 2- pole motor? 100 Select the correct frequency equilibrium: w1 = w2 + w12; w12 = w1 - w2 (w- oomega) The mutual motion of the stator and rotor windings result in ?? If the stator field frequency is 100, what will be the slip frequency of the loaded induction motor? <100 If the stator field frequency is 100, what will be the speedn of induction motor? <100
Microcontroller homework for week 12 1. Three different stepper motors (illustrations on page 162-163): · permanent-magnet, · variablereluctance, · hybrid. The VR stepper has a soft iron rotor with teethand a wound stator. As current is applied to two opposing stator coils, the rotor is pulled into alignment with these twocoils. As the next pair of coils is energized, the rotor advances to the next position. The permanent magnet (PM) stepper has a rotor with alternating north and south. As the coils are energized, the rotor is pulled around. This figure shows a single coil to illustrate the concept, but a realstepper would have stator windings surrounding the rotor. The PM stepper has more torque than an equivalent VR stepper.
Possible values: 0 Ramp 1 Coast 2 DC Brake Parameter A125 sets the Torque Performance mode. Possible values: 0 V/Hz, 1 Sensorless vector 1.3 Explain the difference between the drive braking modes? 0. Ramp Power input to the motor is reduced gradually, following a determined ramp path. 1. Coasting Power is turned off instantly and the rotor is allowed to freely spin until it stops. 2. DC Brake A DC source from the generates a permanent magnetic field in the stator which creates an EMF in the windings of the rotated rotor, causing the braking current. Interaction of the permanent stator flux and the rotor current produces the braking torque. 1.4 When the sensorless vector control is required? Sensorless vector control is beneficial when there is a need to save money on building the drive. With sensorless vector control, costly hardware such as tachometers can be left out from the construction of the drive. 1.5 Call the drive faults you met
http://www.hot.ee/e/emagnetism/ http://www.slideshare.net/KristelKiv/elektromagnetiline-induktsioon1-2 http://www.ene.ttu.ee/leonardo/elektro_alused/4Induktsioon.pdf http://koolibri.ee/download/?action=binary&id=3892 http://www.eki.ee/dict/qs/index.cgi?Q=Agregaat&F=M http://et.wikipedia.org/wiki/Kunda_hüdroelektrijaam http://et.wikipedia.org/wiki/Hüdroelektrijaam http://en.wikipedia.org/wiki/Electromagnet http://et.wikipedia.org/wiki/Induktor_(mähis) http://en.wikipedia.org/wiki/Stator http://en.wikipedia.org/wiki/Inductor http://et.wikipedia.org/wiki/Tuuleturbiin http://et.wikipedia.org/wiki/Turbiin http://et.wikipedia.org/wiki/Jõumasin http://et.wikipedia.org/wiki/Elektrijaam http://et.wikipedia.org/wiki/Elektrigeneraator
telgkompressor mitmeastmeline turbiin multistage turbine niiske aur humid steam otsetoimeline kaitseklapp direct acting safety valve põlemiskamber combustion chamber põleti burner reaktiivturbiin reactive turbine regeneraator regenerator, recuperator regeneratiivne ringprotsess regenerative cycle reguleeritav juhtlaba variable stator vane ringkiirus rotational velocity (speed) rootor rotor soojaveekast hot well soojusjuhtivus heat conductivity soojuspaisumine heat expansion soojusvaheti heat exchanger soojusvahetus heat interchange soojusvõimsus calorific power soojusülekanne heat-transfer staator stator
--13 -- E-8 Left Crankcase Cover & Magneto S/N Part No. Description Quantity Remark 1 11411 /1P50FMG Cover, crankcase, LH 1 2 31100 /1P50FMG Magneto Assy 1 3 31110/1P50FMG Rotor comp., magneto 1 4 31210/1P50FMG Stator comp., magento 1 5 31280/1P50FMG Coil, induction 1 6 31240/1P50FMG Coil, illuminating 1 7 35721/1P50FMG Plate, gear indicator pressure 1 8 31311/1P50FMG Locknut, magneto 1 9 13190/1P50FMG Oil seal, crankshaft, LH 1
--13 -- E-8 Left Crankcase Cover & Magneto S/N Part No. Description Quantity Remark 1 11411 /1P50FMG Cover, crankcase, LH 1 2 31100 /1P50FMG Magneto Assy 1 3 31110/1P50FMG Rotor comp., magneto 1 4 31210/1P50FMG Stator comp., magento 1 5 31280/1P50FMG Coil, induction 1 6 31240/1P50FMG Coil, illuminating 1 7 35721/1P50FMG Plate, gear indicator pressure 1 8 31311/1P50FMG Locknut, magneto 1 9 13190/1P50FMG Oil seal, crankshaft, LH 1
tion by applying power to an electromagnet in some form or another. We won’t spend our time on magnetic theory here. Instead, we will look at the basic motor types and their applications in embedded systems. Stepper Motors Stepper motors come in three flavors: permanent-magnet, variable- reluctance, and hybrid. Figure 7.1 shows a cross-sectional view of a variable- reluctance (VR) stepper motor. The VR stepper has a soft iron rotor with teeth and a wound stator. As current is applied to two opposing stator coils (the two “B” coils in the figure), the rotor is pulled into alignment with these two coils. As the next pair of coils is energized, the rotor advances to the next position. The permanent magnet (PM) stepper has a rotor with alternating north and south poles (Figure 7.2). As the coils are energized, the rotor is pulled around. This figure shows a single coil to illustrate the concept, but a real
Sammmootor Sammmootor on elektrimasin, mis muudab alalispinge impulsi Stepper motor mootori võlli mehaaniliseks energiaks. Soojushulk Füüsikaline suurus, mis iseloomustab soojusvahetuse teel ülekantud energiahulka. Soojushulk eraldub elektrivoolu läbimisel läbi takisti. Staator Elektrimootori paigalseisev osa, milles tekitatakse mootori Stator pöörlemise jaoks vajalik magnetväli. Sujuvkäiviti Seade asünkroonmootori sujuvaks käivitamiseks muutes pinge Soft starter efektiivväärtust pooljuhtlülitite abil. Sujuvkäivitus vähendab mootori käivitusvoolu ja käivitusmomenti. Sünkroonmootor Ühe – või kolmefaasilisel vahelduvpingel töötav mootor, milles Synchronous motor rootori magnetväli tekitatakse ergutusmähise või püsimagnetitega.
alternator. 2 Disconnect the battery negative terminal, then disconnect the multiplug or leads from the rear of the alternator. 3 On certain CVH engine models it may be 6.2 Exploded view of the Bosch G1 and K1 series alternators necessary to remove the air cleaner hose, and A Fan H Rectifier diode pack disconnect the radiator bottom hose to give B Spacer J Stator sufficient clearance to enable removal of the C Drive end housing K Slip rings alternator, in which case the cooling system D Drive end bearing retaining plate L Rotor must be drained with reference to Chapter 1. E Slip ring end bearing M Drive end bearing 4 Release the mounting and adjuster link F Slip ring end housing N Spacer
and pH. After meat protein solubilization is cutters, the knives can reach local peak tem- 158 Chapter 7 peratures of up to 75°C. This causes denatur- geneizing intermediate- and high-viscosity ation of the proteins, which then form fluids. The coarse batter flows through a unwanted small lumps in the sausage meat narrow gap between two disks, a rotative disk and partly lose their ability to bind water. (the rotor) and a static disk (the stator). Intense shear stress in the gap is due to the high rotation speed (from about 1000 to Cooking 2000 rpm) and the narrowness of the gap (50 The final texture of comminuted meat prod- to 1000 μm). Many of the factors that increase ucts is primarily the result of the protein gel the effectiveness of droplet disruption also
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