Three-phase AC machines

Июль 23, 2022

Содержание

2. Motor construction
4. Synchronous speed
5. EXAMPLE 1 – A four-pole AC three‑phase machine is fed with a supply at a frequency
6. EXAMPLE 1 – A four-pole AC three‑phase machine is fed with a supply at a frequency
8. Slip Slip is defined in two ways: per unit slip % slip and can be calculated
9. EXAMPLE 2 – A two-pole induction motor runs at 2880 rpm when connected to the 50
10. EXAMPLE 2 – A two-pole induction motor runs at 2880 rpm when connected to the 50
11. EXAMPLE 3 – A four‑pole 50Hz induction motor has a per‑unit slip of 0.03 on full
12. EXAMPLE 3 – A four‑pole 50Hz induction motor has a per‑unit slip of 0.03 on full
13. Wound rotor motor
14. AC three phase generator
16. Скачать презентацию

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Motor construction

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Synchronous speed

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EXAMPLE 1 – A four-pole AC three‑phase machine is fed with a

supply at a frequency of 50Hz. Calculate synchronous speed in:
rps
rpm
NB: the machine has four poles, so that is two pairs of poles.

a)

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EXAMPLE 1 – A four-pole AC three‑phase machine is fed with a

supply at a frequency of 50Hz. Calculate synchronous speed in:
rps
rpm

b)

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Slip
Slip is defined in two ways:
per unit slip
% slip
and can be

calculated as follows:

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EXAMPLE 2 – A two-pole induction motor runs at 2880 rpm when connected

to the 50 Hz mains supply. Calculate the:
per unit slip
percentage slip.

a)

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EXAMPLE 2 – A two-pole induction motor runs at 2880 rpm when connected

to the 50 Hz mains supply. Calculate the:
per unit slip
percentage slip.

b)

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EXAMPLE 3 – A four‑pole 50Hz induction motor has a per‑unit slip

of 0.03 on full load. Calculate the full load speed.

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EXAMPLE 3 – A four‑pole 50Hz induction motor has a per‑unit slip

of 0.03 on full load. Calculate the full load speed.

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Wound rotor motor

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AC three phase generator