Electrical drives and power electronics (0)

Sarnased õppematerjalid

8

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Test VIII - cumulative test

The DC machines are associated with the names of Jacobi and Henry. The electromagnetic torque is born in air gap. The torque is proportional to the current in dc motor. Which equations are correct? P = sW; oomega = tuletis fii'st The angular frequency is 2*pi()*n / 60 ja 2*pi()f The motor torque is equal to TL + J * oomega tuletis aja järgi The inductor supplies the motor with flux. The leading companies in the world market of electrical drive engineering are: Mitsubishi. The energy balance is described by energy conservation law. The armature supplies the motor with current. The cheapest and the most reliable is induction motor. The torque production is the result of interaction of current - flux. The mechanical torque as compared to the electromechanical torque is ?? The source of the magnetic flux of the motor is DC or permanent magnet. The most suitable for the speed control is synchronous servo motor.

Sissejuhatus robotitehnikasse

3

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Quiz3 vastatud

- 25. If J = 3, = 2, and t = 10, what will be T? -3*2/10=0,6 I*w/t 26. If J = 12 and T = 10, what will be acceleration? -10/12=0,8m/s2 T/J 27. If J = 4 T = 2, and = 5, how long the start-up will continue? -4*5/2=10s I*w/T 28. If J = 1 and T = 5, what speed will be reached at t = 2? -5*2/1=10rad/s t*T/J 29. If J = 12, what torque is required to provide acceleration of 5? -12*5=60Nm 30. If J = 5 and T = 5, what time is needed to reach the speed of 5? -5*5/5=5s I*w/T 2. Quiz on Electrical Drive Characteristics 1. Name the typical kinds of the time response processes. 2. What units are used to measure the drive quick action? 3. What units are used to measure the time constants? 4. What is the usual accuracy range of the accurate drives? 5. Does the mechanical time constant depend on the start-up speed? 6. How can the electromagnetic time constant be calculated? 7. Which time constant is usually the longest and which one is the shortest ? thermal, mechanical, or electromagnetic? 8

Elektriajamite üldkursus

568

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Book Analog Interfacing to Embedded Microprocessors

I hope it proves useful. ix Introduction Modern electronic systems are increasingly digital: digital microprocessors, digital logic, digital interfaces. Digital logic is easier to design and understand, and it is much more flexible than the equivalent analog circuitry would be. As an example, imagine trying to implement any kind of sophisticated micro- processor with analog parts. Digital electronics lets the PC on your desk execute different programs at different times, perform complex calculations, and communicate via the World Wide Web. While the electronic world is nearly all digital, the real world is not. The temperature in your office is not just hot or cold, but varies over a wide range. You can use a thermometer to determine what the temperature is, but how do you convert the temperature to a digital value for use in a microprocessor- controlled thermostat

Mehhatroonika

12

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Elektriajamite 1. Labor

Tallinn University of Technology Department of Electrical Engineering Report on laboratory work 1 on General Course of Electrical Drive SENSORLESS DRIVE POWER FLEX (ALLEN BRADLEY) Jüri Lina 666BMW Group M16 Variant 2 Tallinn 2014 1. Functional Diagram 2. Tables of observations Task Operation/Record Observation 1 Reverse the motor speed. How long Time to reverse was 16 does the motor reverse

Elektriajamid

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Piletid vastustega

circuit. 6) One of its main applications is in rectifiers, circuits that convert the Alternating voltage or alternating current into direct voltage or direct current. It is also applied in detectors, which find the signals in the noisy operation conditions. The third application is in switching circuits because an ideal rectifier acts like a perfect conductor when forward biased and lik a perfect insulator when reverse biased. 7) A power diode is more complicated in structure and operational characteristics than the small signal diode. The forward bias characteristic of the power diode is approximately linear, which means that the voltage drop is proportional to the omic resistance and to the current. The rated currents of power diodes are thousands of amperes and the area of the pn junction may be tens of square centimeters. In the case of power diode, the additional n- layer exists between these two layers, which is

Elektroonika jõupooljuht tehnika

3

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Microcontroller homework 07

Some hybrid steppers have more than one stackof magnets for more torque. 2. There are two types of stator winding methods forstepper motors: bipolar and unipolar. Bipolar windings use field coils with no common connections. The coils must be driven independently to reverse the direction of motor flow and rotate the motor. Unipolar motors use coils with centertaps. The centertap is usually connected to the positive supply, and the individual coils are grounded (through transistors) to drive the motor. Each time the field is changed in a bipolar motor or a different coil isturned on in a unipolar motor, the motor shaft steps to the next rotation position. Typical step sizes for a stepper are 7.5° or 15°. A 7.5° stepper will have360/7.5 or 48 steps per revolution. The step size depends on the number of rotor and stator teeth.  3. Considering the following circuit diagrams The Table:

Mikrokontrollerid ja praktiline robootika

16

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Elektriajamite 4. labor

Tallinn University of Technology Department of Electrical Engineering Report on laboratory work 4 on General Course of Electrical Drive INDUCTION MOTOR DRIVE (LUCAS-NÜLLE) Jüri Lina 666BMW Group M16 Variant 2 Tallinn 2014 1. Functional Diagram Nameplate data: Loading Machine SO3636- VDE 0530 IP:5 Is.KL: 6V 4 F U: 390V I: 4,4 A 4Nm/1.7k cos: W

Elektriajamid

14

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Mikrokontrollerid ja robootika homework 2

value of the worst spurious signal. 6. Channels - related to the inputs of the ADC can either be multiplexed or individually selected. 7. Linearity - relates to how a ADC follows a linear function. All ADCs are to a certain extend nonlinearity. 8. Operating temperature - measurement, which in optimal state for ADC-s, lets them function correctly. 9. Power dissipation - refers to the amount power dissipated when the ADC is operating. Question 2 An 8 bit ADC has a reference voltage of 5V. What is the digital output code word for an input of 1.2V? What is the voltage range corresponding to 1 LSB? 1,2𝑉 0,0195𝑉 = 61 ; 61 = 001111012 Digital output code for an input of 1.2V is 001111012. Voltage range corresponding to 1 LSB is U= 0,0195V. Question 3 A 15 bit ADC has a reference voltage of 10V. What is the digital output code word for an input of 6.83V

Mikrokontrollerid ja robootika

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