Question

A motor operates from a DC supply in the range 5 V to 24 V, depending on the speed required. The current through the motor will be in the range 0.1 A to 6.5 A, depending on the torque required. One terminal of the motor is permanently connected to earth. It is required to measure both the voltage and the current using two analogue voltage input channels of a data acquisition system. Draw a diagram showing how the data acquisition system should be connected to the motor circuit, and specify how each input channel should be configured

Answer #1

A separate excited DC motor is running at 1000 rpm when the
armature voltage is 600 V. The motor has a field constant Kphi = 4
V.sec and the armature resistance of the motor is 0.8 Ohms.
i. Calculate the value of the resistance of the dynamic braking at
full load. The armature current should be limited to 200 % of the
rated value.
ii. If the motor operates in regenerative braking at a speed of
1200 rpm, calculate the...

A 230 V, 250 rpm, 100 A separately excited dc motor has
an armature resistance of 0.5 Ω. The motor is connected to 230 V dc
supply and rated dc voltage is applied the field winding. It is
driving a load whose torque-speed characteristic is given
by
TL = 500 − 10ω where ω is the speed in rad/sec and TL is
the load torque in N-m. Find
(a) the steady state speed at which the motor will drive
the...

Design of DC Motor Starter
In order for a dc motor to function properly, it must be protected
from physical
damage during the starting period. At starting conditions, the
motor is not rotating,
and armature generated voltage EA = 0 V. Since the internal
resistance of a normal DC
motor is very low, a very high current flows. It is possible for a
motor to be severely
damaged by such currents, even if they last for only a moment.
A...

Design of DC Motor Starter In order for a dc motor to function
properly, it must be protected from physical damage during the
starting period. At starting conditions, the motor is not rotating,
and armature generated voltage EA = 0 V. Since the internal
resistance of a normal DC motor is very low, a very high current
flows. It is possible for a motor to be severely damaged by such
currents, even if they last for only a moment. A...

The full-load armature current of a 5 hp, 150 V shunt dc motor
is 30 A. The field (shunt) resistance and the armature resistance
of the motor are ????F = 125 ? and ???????? = 0.15, respectively.
At a random speed of 1800 rpm magnetization curve of the motor has
measured and is shown in the table below. ????0 (V) armature
voltage 10 90 110 140 170 185 ???????? (A) field (shunt) current 0
0.82 1 1.2 1.7 2.88 Calculate...

In order for a dc motor to function properly, it must be
protected from physical damage during the starting period. At
starting conditions, the motor is not rotating, and armature
generated voltage EA = 0 V. Since the internal resistance of a
normal DC motor is very low, a very high current flows. It is
possible for a motor to be severely damaged by such currents, even
if they last for only a moment.
A solution to the problem of...

Question 2
The full-load armature current of a 5 hp, 150 V shunt dc motor
is 30 A. The field (shunt) resistance and the armature resistance
of the motor are ????F=125 ? and ????????=0.15, respectively. At a
random speed of 1800 rpm magnetization curve of the motor has
measured and is shown in the table below.
EO(V) armature voltage
10
90
110
140
170
185
IF (A) field (shunt) current
0
0.82
1
1.2
1.7
2.88
Calculate the following:
a....

A 200 V DC, 1,800 RPM shunt connected motor has an armature
resistance of 0.4 ohm and a brush resistance of 0.4 ohm; brush
voltage drop of 6.0 V, independent of load. The resistance of the
shunt field is 230 ohm. The full load rated line current is 40 A.
When the motor is operated at no load the line current is 5 A and
the speed is 1750 RPM.
Calculate speed at rated load
Calculate speed at .3 rated...

The following test data apply to a 7.5-hp, three-phase, 220-V,
19-A,60-Hz, four-pole induction motor with a double-squirrel-cage
rotor of design class C (high-starting-torque, low-starting current
type): Test 1: No-load test at 60 Hz; Applied voltage V = 219 V
line-to-line; Average phase current I1,nl = 5.70 A; Power Pnl =380
W; Test 2: Blocked-rotor test at 15 Hz; Applied voltage V = 26.5 V
line-to-line; Average phase current ll,bl = 18.57 A; Power Pbl =
675 W; Test 3: Average...

A 5-kW, 220-V shunt motor has an armature resistance of 0.15 ?
and a field-circuit resistance of 100 ?. The motor delivers rated
output power at rated voltage when its armature current is 20 A.
When the motor is operating at rated voltage, the speed is observed
to be 1000 r/min when the machine is loaded such that the armature
current is 15 A. In order to protect both the motor and the dc
supply under starting conditions, an external...

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