Bctn bai7

Động cơ không đồng bộ 3 pha rotor dây quấn

TRƯỜNG ĐẠI HỌC BÁCH KHOA TP.HCM
KHOA ĐIỆN – ĐIỆN TỬ
BỘ MÔN THIẾT BỊ ĐIỆN
PTN KỸ THUẬT ĐIỆN (103B1)

BÁO CÁO THÍ NGHIỆM

Bài 7:

ĐỘNG CƠ KHÔNG ĐỒNG BỘ BA PHA
ROTOR DÂY QUẤN

Họ và Tên:..............................................................................................................................
MSSV: ...................................................................................................................................
Nhóm: ...................................Tổ: .........................................................................................
Thời gian thí nghiệm: ............................................................................................................

TP.HCM , THÁNG ...... NĂM 201...
Báo cáo thí nghiệm Máy điện

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Động cơ không đồng bộ 3 pha rotor dây quấn
Nhãn máy động cơ đồng bộ 3 pha dùng trong thí nghiệm của sinh viên:
Thơng số

Giá trị

Điện áp định mức
Dịng điện định mức
Cơng suất định mức
Tốc độ định mức
Tần số

1. Thí nghiệm mở máy động cơ không đồng bộ
a. Sơ đồ nguyên lý:
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b. Kết quả đo đạc:
 Bảng số liệu đo đạc:
Vị trí
Rmm[Ω]
I1[A]
I2[A]

1

2

3

4

5

c. Yêu cầu – Giải thích:

Báo cáo thí nghiệm Máy điện

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Động cơ không đồng bộ 3 pha rotor dây quấn
 Xây dựng đặc tuyến I1 = f(Rmm)
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 Xây dựng đặc tuyến I2 = f(Rmm).
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Báo cáo thí nghiệm Máy điện

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Động cơ không đồng bộ 3 pha rotor dây quấn
 Nêu nhận xét về 2 đặc tuyến
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 So sánh việc khởi động động cơ không đồng bộ 3 pha Rotor lồng sóc và Rotor dây quấn,
nêu ảnh hưởng của giá trị R2 lên việc khởi động động cơ.
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2. Thí nghiệm khơng tải:
a. Sơ đồ ngun lý:
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Báo cáo thí nghiệm Máy điện

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Động cơ không đồng bộ 3 pha rotor dây quấn
b. Số liệu đo đạc:
 Bảng số liệu đo không tải:
Va[V]

100

120

140

160

180

200

220

230

Vb[V]
Vc[V]
V0= V [V]
Ia[A]
Ib[A]
Ic[A]
I0= I [A]
Pa[W]
Pb[W]
Pc[W]
P0=  P[W]
cos
c. Yêu cầu – Giải thích:
 Xây dựng đặc tuyến P0 = f(U0)
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Báo cáo thí nghiệm Máy điện

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Động cơ không đồng bộ 3 pha rotor dây quấn
 Xây dựng đặc tuyến I0 = f(U0)
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 Nhận xét về hai đặc tuyến trên
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 Ước lượng giá trị tổn hao quay (tổn hao cơ) và tổn hao sắt từ.
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Bảng số liệu đo K:
UL1 – L2[V]

100

200

Ua-b[V]
K

K

Báo cáo thí nghiệm Máy điện

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Động cơ không đồng bộ 3 pha rotor dây quấn
 Nêu ý nghĩa K, so sánh với MBA
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3. Thí nghiệm ngắn mạch
a. Sơ đồ nguyên lý
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b. Số liệu đo đạc:
 Bảng số liệu đo thí nghiệm ngắn mạch:
Va[V]
Vb[V]
Vc[V]
Vn= V [V]

Ia[A]

0.25

0.30

0.35

0.40

0.45

0.50

0.55

Ib[A]
Ic[A]
In= I [A]
Pa[W]
Pb[W]
Pc[W]
Pn=  P[W]
I2n[A]
cos
Báo cáo thí nghiệm Máy điện

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Động cơ không đồng bộ 3 pha rotor dây quấn
c. Yêu cầu – Giải thích:
 Xây dựng đặc tuyến Pn = f(Un)
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 Xây dựng đặc tuyến I1n = f(Un).
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Báo cáo thí nghiệm Máy điện

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Động cơ không đồng bộ 3 pha rotor dây quấn

 Xây dựng đặc tuyến I2n = f(Un)
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 Nhận xét đặc tuyến.
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4. Thí nghiệm có tải
a. Sơ đồ ngun lý:
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Báo cáo thí nghiệm Máy điện

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Động cơ không đồng bộ 3 pha rotor dây quấn
b. Số liệu đo đạc:

I1 [A]
P2 [W]
cos1

0.30

0.55

c. Yêu cầu – Giải thích:
 Xây dựng đặc tuyến I1 = f(P2)
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 Xây dựng đặc tuyến cos1 = f(P2).
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Báo cáo thí nghiệm Máy điện

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Động cơ không đồng bộ 3 pha rotor dây quấn
 Nhận xét so sánh động cơ không đồng bộ 3 pha rotor dây quấn so với rotor lồng sóc
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Ưu điểm:

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Khuyết điểm:

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Báo cáo thí nghiệm Máy điện

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