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Động cơ không đồng bộ 3 pha rotor dây
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
Page 1
Động cơ không đồng bộ 3 pha rotor dây
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
Page 2
Động cơ không đồng bộ 3 pha rotor dây
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
Page 3
Động cơ không đồng bộ 3 pha rotor dây
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 nguyên lý:
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Báo cáo thí nghiệm Máy
Page 4
Động cơ không đồng bộ 3 pha rotor dây
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
Page 5
Động cơ không đồng bộ 3 pha rotor dây
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
Page 6
Động cơ không đồng bộ 3 pha rotor dây
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
Page 7
Động cơ không đồng bộ 3 pha rotor dây
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
Page 8
Động cơ không đồng bộ 3 pha rotor dây
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
Page 9
Động cơ không đồng bộ 3 pha rotor dây
b. Số liệu đo đạc:
I1 [A]
P2 [W]
cos1
0.30
0.55
c. Yêu cầu – Giải thích:
Xây dựng đặc tuyến I1 = f(P2)
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Xây dựng đặc tuyến cos1 = f(P2).
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Báo cáo thí nghiệm Máy
Page
Động cơ không đồng bộ 3 pha rotor dây
Nhận xét so sánh động cơ không đồng bộ 3 pha rotor dây quấn so với rotor lồng sóc
Ưu điểm:
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Khuyết điểm:
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Báo cáo thí nghiệm Máy
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