- •Memorize the words and word combinations and their equivalents.
- •Find the words and combinations of words in the text and translate the sentences containing them.
- •Read and translate the text.
- •Translate the word combinations from the text:
- •Point out the sentences in the text in which the word “to make” should be translated as “примушувати”.
- •Answer the questions.
- •Find the sentences in the text telling you about two problems facing the simple two pole dc motor. Text b Compensation for stator field distortion
- •Make sure that you know these words and word combinations.
- •Read and translate the text.
- •Answer the questions.
- •Text c Dynamo Design Variations
- •Read and memorise the words and word combinations.
- •Permanent magnet motor – двигун з постійним магнитом
- •Read and translate the text.
- •Answer the questions.
- •Listen to the words and word combinations from the text. Pay attention to their meaning.
- •Memorize the words and word combinations and their equivalents.
- •Read and translate the text.
- •Match the words and word combinations (a-e) to the sentences (1-5)
- •Answer the questions to the text
- •Say if the statement to the text is true or false
- •Translate the sentences paying attention to Indefinite Tenses in Active and Passive. Correct the mistakes in the sentences.
- •Text b Basic construction
- •Listen to the words and word combinations from the text. Pay attention to their meaning.
- •Memorize the words and word combinations and their equivalents
- •Read and translate the text
- •Match the words and word combinations (a-e) to the sentences (1-5)
- •Answer the questions to the text
- •Say if the statements to the text are true or false
- •Translate the sentences paying attention to Indefinite Tenses in Active and Passive. Correct the mistakes in the sentences.
- •Text c Principles of operation
- •Listen to the words and word combinations from the text. Pay attention to their meaning.
- •Find the words and combinations of words in the text and translate the sentences containing them.
- •Memorize the words and word combinations and their equivalents.
- •Read and translate the text
- •Match the words and word combinations (a-f) to the sentences (1-6)
- •Answer the questions to the text
- •Define the functions of Participle I and Participle II in the following sentences
- •Say, which of the sentences are in the Active and which are in the Passive Voice
- •Translate the sentences paying attention to the Sequence of Tenses
- •Translate the following Conditional sentences
- •Transformer Text a
- •Read and memorize words and word-combination
- •Make sure that you know these words and word combinations.
- •Read and translate the text.
- •Math the following English words with the Ukrainian ones.
- •Find English equivalents to the words:
- •Translate the word combinations from the text:
- •Answer the questions to the text.
- •Text b Operation at different frequencies
- •Read and memorize the words and word-combinations
- •Be sure that you know these words
- •Read and translate the text.
- •Text c Limitations
- •Make sure that you know these words and word combinations.
- •Read and translate the text.
- •Find the equivalents to the following.
- •Text d Construction
- •Read and memorise the words and word combinations
- •Read and translate the text. Cores
- •Find the equivalents to the folloving English words:
- •Point out English equivalents to the words:
- •Translate the word combinations.
- •Answer the questions.
- •Read the passage about steel cores. Retell it. Text e Windings
- •Listen to the words and word combinations from the text and memorize them.
- •Read and translate the text.
- •Match the English words and word combinations with the Ukrainian ones.
- •Insulation of windings
- •Text g Shielding
- •Supplement Speed control
- •Dc motor starters
- •Shielding
- •Autotransformers
- •Voltage transformers
- •Pulse transformers
- •3 Phase electrical power Transformer
- •3 Phase Transformer Delta and Wye Connections
- •Перелік скорочень
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Match the words and word combinations (a-f) to the sentences (1-6)
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induces
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slip
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friction
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accelerate
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air-gap
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interacts
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The magnetic field in a normal induction motor is induced across the rotor … .
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This magnetic field … with the rotating stator flux to produce the rotational force.
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When the rotor starts to … in the direction of the rotating field, the rate at which the magnetic field cuts the rotor windings reduces and the induced rotor voltage decreases proportionately.
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As the magnetic field rotates, the lines of flux cut across the rotor conductors and this … a voltage in the rotor windings.
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The amount of … is determined by the load torque required to turn the rotor shaft.
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The rotor settles at a speed slightly less than the rotating flux, which provides enough torque to overcome bearing … and windage.
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Answer the questions to the text
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What currents set up a changing magnetic field which rotates around the inside of the stator?
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What is a synchronous speed?
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What is the rotating field produced by in the simplest type of 3-phase induction motor?
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How many rotations for every cycle of the supply voltage does the flux perform when the three stator windings are connected to the 3-phase power supply?
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What is a 2 pole motor?
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Where is a magnetic field induced in a normal induction motor?
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What must be present across the rotor bars to establish a current flow in the rotor?
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What speed must the rotor rotate at to produce torque?
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What is a slip?
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What is a slip speed?
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What is the amount of slip determined by?
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What does the direction of the rotating stator flux depend on?
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What is a phase sequence?
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Define the functions of Participle I and Participle II in the following sentences
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When the induction motor is supplied from a power source of constant voltage and frequency, the current drawn by the motor depends primarily on the slip.
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At no-load, the motor will draw only no-load magnetizing current.
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When matching motors to mechanical loads, the two most important considerations are torque and speed.
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Induced voltage reappears in the rotor, but in the opposite direction.
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When set up a changing magnetic field rotates around the inside of the stator.
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Say, which of the sentences are in the Active and which are in the Passive Voice
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In contrast with a DC motor, the AC induction motor doesn’t have separate field windings.
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The performance of the 3-phase AC induction motor has been described for the speed range from zero up to its rated speed at 50 Hz.
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Typically, the slip varies between about 1% of synchronous speed at no-load to about 6% of synchronous speed at full-load.
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The induction motor will always run at a speed lower than synchronous speed because, even at no-load, a small slip is required to ensure that there is sufficient torque to overcome friction and windage losses.
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Inertia can be calculated using the formula.