dc motor 1.ppt

Download dc motor 1.ppt

Post on 02-Jun-2018

231 views

Category:

Documents

0 download

Embed Size (px)

TRANSCRIPT

  • 8/10/2019 dc motor 1.ppt

    1/73

  • 8/10/2019 dc motor 1.ppt

    2/73

    Armature

    comutator

    Teras Kutub

    Belitan

    medanCarbon

    brush holder

  • 8/10/2019 dc motor 1.ppt

    3/73

    A typical DC motor

  • 8/10/2019 dc motor 1.ppt

    4/73

  • 8/10/2019 dc motor 1.ppt

    5/73

    (a) Armature and commutator segments. (b) Armature prior to the coil's wire

    being installed. (c) Coil of wire prior to being pressed into the armature. (d) A

    coil pressed into the armature. The end of each coil is attached to a

    commutator segment.

  • 8/10/2019 dc motor 1.ppt

    6/73

    (a) This diagram shows the

    location of the pole pieces in

    the frame of a DC motor. (b)

    This diagram shows anindividual pole piece. You can

    see that it is made of

    laminated sections. The field

    coils are wound around the

    pole pieces.

  • 8/10/2019 dc motor 1.ppt

    7/73

    The armature (rotor) of a DC motor has coils of wire wrapped around its

    core. The ends of each coil are terminated at commutator segments

    located on the left end of the shaft. The brushes make contact on the

    commutator to provide current for the armature.

  • 8/10/2019 dc motor 1.ppt

    8/73

    The stationary part of a DC motor has the field coils mounted in it.

  • 8/10/2019 dc motor 1.ppt

    9/73

  • 8/10/2019 dc motor 1.ppt

    10/73

  • 8/10/2019 dc motor 1.ppt

    11/73

  • 8/10/2019 dc motor 1.ppt

    12/73

    Belitan

    medan

    Belitan Kutub

    Antara

    Teras Kutub

  • 8/10/2019 dc motor 1.ppt

    13/73

    Simple electrical diagram of DC shunt motor. This

    diagram shows the electrical relationship between the

    field coil and armature.

  • 8/10/2019 dc motor 1.ppt

    14/73

  • 8/10/2019 dc motor 1.ppt

    15/73

  • 8/10/2019 dc motor 1.ppt

    16/73

  • 8/10/2019 dc motor 1.ppt

    17/73

    BELITAN GELOMBANG

  • 8/10/2019 dc motor 1.ppt

    18/73

  • 8/10/2019 dc motor 1.ppt

    19/73

    Belitan ombak/gelombang C = 2

  • 8/10/2019 dc motor 1.ppt

    20/73

    Belitan gelombong memerlukan :-

    - Sekurang-kurangnya dua berus tetapibilangan berus maksimum sama

    banyaknya dengan kutub .

    - Hanya dua laluan selari melalui angkerdalam satu belitan gelombang yang

    lengkap tanpa mengira bilangan berus .

  • 8/10/2019 dc motor 1.ppt

    21/73

  • 8/10/2019 dc motor 1.ppt

    22/73

    BELITAN LAPIS, C = 2P

  • 8/10/2019 dc motor 1.ppt

    23/73

  • 8/10/2019 dc motor 1.ppt

    24/73

    Secara am , belitan tindih/lapis

    memerlukan:-

    Berus sama banyak dengan kutub

    Laluan selari melalui angker samabanyak dengan kutub

  • 8/10/2019 dc motor 1.ppt

    25/73

    MOTOR SIRI AT

  • 8/10/2019 dc motor 1.ppt

    26/73

  • 8/10/2019 dc motor 1.ppt

    27/73

    Electrical diagram of series motor. Notice that the series field is

    identified as S1 and S2.

  • 8/10/2019 dc motor 1.ppt

    28/73

    The relationship between series motor speed and the armature

    current.

  • 8/10/2019 dc motor 1.ppt

    29/73

    MOTOR PIRAU AT

  • 8/10/2019 dc motor 1.ppt

    30/73

  • 8/10/2019 dc motor 1.ppt

    31/73

    Diagram of DC shunt motor. Notice the shunt coil is identified as a coil of

    fine wire with many turns that is connected in parallel (shunt) with thearmature.

  • 8/10/2019 dc motor 1.ppt

    32/73

    curve that shows the armature current versus the armature speed

    for a shunt motor. Notice that the speed of a shunt motor is nearly

    constant.

  • 8/10/2019 dc motor 1.ppt

    33/73

    MOTOR MAJMUK AT

  • 8/10/2019 dc motor 1.ppt

    34/73

  • 8/10/2019 dc motor 1.ppt

    35/73

  • 8/10/2019 dc motor 1.ppt

    36/73

  • 8/10/2019 dc motor 1.ppt

    37/73

    (a) Diagram of a cumulative compound motor, (b) Diagram of a differential

    compound motor, (c) Diagram of an interpole compound motor.

  • 8/10/2019 dc motor 1.ppt

    38/73

    (a) Characteristic curve of armature current versus speed for the

    differential compound motor and cumulative compound motor, (b)

    Composite of the characteristic curves for all of the DC motors.

  • 8/10/2019 dc motor 1.ppt

    39/73

  • 8/10/2019 dc motor 1.ppt

    40/73

  • 8/10/2019 dc motor 1.ppt

    41/73

  • 8/10/2019 dc motor 1.ppt

    42/73

    http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/motdc.htmlhttp://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/motdc.htmlhttp://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/motdc.htmlhttp://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/motdc.htmlhttp://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/comtat.html
  • 8/10/2019 dc motor 1.ppt

    43/73

    http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/motdc.htmlhttp://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/motdc.htmlhttp://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/motdc.htmlhttp://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/motdc.htmlhttp://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/comtat.html
  • 8/10/2019 dc motor 1.ppt

    44/73

    http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/motdc.htmlhttp://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/motdc.htmlhttp://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/motdc.htmlhttp://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/motdc.htmlhttp://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/comtat.html
  • 8/10/2019 dc motor 1.ppt

    45/73

    http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/motdc.htmlhttp://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/motdc.htmlhttp://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/motdc.htmlhttp://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/motdc.htmlhttp://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/comtat.html
  • 8/10/2019 dc motor 1.ppt

    46/73

  • 8/10/2019 dc motor 1.ppt

    47/73

  • 8/10/2019 dc motor 1.ppt

    48/73

  • 8/10/2019 dc motor 1.ppt

    49/73

  • 8/10/2019 dc motor 1.ppt

    50/73

  • 8/10/2019 dc motor 1.ppt

    51/73

  • 8/10/2019 dc motor 1.ppt

    52/73

  • 8/10/2019 dc motor 1.ppt

    53/73

  • 8/10/2019 dc motor 1.ppt

    54/73

  • 8/10/2019 dc motor 1.ppt

    55/73

  • 8/10/2019 dc motor 1.ppt

    56/73

  • 8/10/2019 dc motor 1.ppt

    57/73

    Contoh Soalan:

    Sebuah motor at di sambung kpd bekalan

    240V. Rintangan angker 0.2. Tentukan

    nilai DGE balik jika arus angker ialah 50A

    Eb = VIaRa= 240(50 x 0.2)

    = 24010

    = 230V

  • 8/10/2019 dc motor 1.ppt

    58/73

    The armature of dc machine has a resistance of 0.25

    and is connected to a 300V supply. Calculate the emf

    generated when it is running :a. as a generator giving 100A.

    b. as a motor taking 80A

    a. As a generator, generated emf:E = V + IaRa

    = 300 + (100 x 0.25) = 300 + 25= 325V

    b. As a motor, generated emf (or back emf):

    Eb = VIaRa

    = 300(80 x 0.25) = 30020 = 280V

  • 8/10/2019 dc motor 1.ppt

    59/73

    Daya Kilas (Tork) Mesin AT

    Dari persamaan; V = Eb + IaRa

    Darabkan persamaan diatas dgn Ia:

    VIa = EbIa + IaRa

    VIa = Jumlah kuasa elektrik yg dibekal

    kpd angker

    EbIa= Jumlah kuasa mekanikal ygdihasilkan oleh angker.

    IaRa = Kehilangan kuasa oleh belitan

    angker

  • 8/10/2019 dc motor 1.ppt

    60/73

    Jika T ialah tork dlm N-m,

    Oleh itu kuasa mekanikal yg terhasil adalah:

    T= 2nT = EbIa

    Tork, T = EbIa

    2

    n

    Juga : Eb = 2pZn

  • 8/10/2019 dc motor 1.ppt

    61/73

    J g p

    c

    P = pasang kutub = fluks/kutub (Wb)

    Z = Bil. Pengalir angker

    n = kelajuan dlm rev/sc = 2 ; belitan ombak

    = 2p ; belitan lapis @ tindih

    Formula diatas boleh juga ditulis spt berikut:

    Eb = 2pZN

    60c

  • 8/10/2019 dc motor 1.ppt

    62/73

    2nT = EbIa = ( 2pZn ) Ia

    c

    T = pZIa

    c

    T

    Ia

  • 8/10/2019 dc motor 1.ppt

    63/73

    Sebuah motor dc 8 kutub dgn lilitan ombak mempunyai 900 pengalir

    angker. Fluks berguna per kutub ialah 25mWb. Tentukan nilai daya

    kilas apabila arus 30A mengalir melalui angker.

    T = pZIa

    c

    = 4 x 25 x 10-3x 900 x 30

    x 2= 429.7 Nm

    Tentukan nilai T yg terbina apabila motor at dgn voltan bekalan

  • 8/10/2019 dc motor 1.ppt

    64/73

    Tentukan nilai T yg terbina apabila motor at dgn voltan bekalan

    350V mempunyai rintangan angker 0.5dan kelajuan putaran ialah

    15rev/s. Arus angker ialah 60A

    T = EbIa2n

    Eb = VIaRa

    = 350(60)(0.5)= 35030 = 320V

    T = EbIa = 320 x 60

    2n 2 x 3.14 x 15

    = 203.7 Nm

    A six pole lap wound motor is connected to a 250V dc

  • 8/10/2019 dc motor 1.ppt

    65/73

    A six-pole lap-wound motor is connected to a 250V dc

    supply. The armature has 500 conductors and a resistance

    of 1 ohm. The flux per pole is 20mWb. Calculate (a) the

    speed and (b) the torque developed when the armaturecurrent is 40A

    a. Eb = VIaRa = 250(40 x 1) = 210V

    Eb = 2pZN60c

    N = 60cEb

    2pZ

    = 60 x 2 x3 x 2102 x 3 x 20 x 10-3x 500

    = 1260 rpm

  • 8/10/2019 dc motor 1.ppt