DC Shunt Machines

Question 1

dc shunt machine definition

Answer 1

field winding is in parallel with armature separate currents flow in field and armature

Question 2

relation between IA and If, and what is In (form sheet)

Answer 2

majority power is delivered to armature current
If<Ia

Iin = Ia+If

Question 3

V formula sheet

Answer 3

Vin = IaRa+e

Question 4

what happens to Bf

Answer 4

Flux BF constant and ke is constant

Question 5

speed-current realtionship formula sheet

Answer 5

𝜔 = (𝑉𝑖𝑛/𝑘𝐸)− ( (𝐼𝐴*𝑅𝐴/𝑘E))

Question 6

speed-T relationship

Answer 6

𝜔 = (𝑉𝑖𝑛/𝑘𝐸)− ( (𝑇*𝑅𝐴/(𝑘E)^2))

Question 7

t-speed relationship formula sheet

Answer 7

𝑇 = (𝑘𝐸/𝑅𝐴) x (𝑉𝑖𝑛 − 𝑘𝐸𝜔)

Question 8

T-Ia characteristic

Answer 8

Torque is directly proportional to armature current

Question 9

speed - Ia characterisitic

Answer 9

speed is almost constant for all armature current up to full loaded current

Question 10

torque - speed characterisitc

Answer 10

Torque has a near-linear inverse relationship with speed — small drop in speed as torque increases. works within small speed range