Question
In: Electrical Engineering
The no-load speed of shunt motor Wo at supply voltage equal Va with linear magnetic characteristics....
The
no-load speed of shunt motor Wo at supply voltage equal Va with
linear magnetic characteristics. If the supply voltage is
increased, the no-load speed will be:
Solutions
Manojponduru answered 2 years agoRelated Solutions
A shunt motor has a supply voltage of 200 V and armature resistance of 3.6 Ω....
A shunt motor has a supply voltage of 200 V and
armature resistance of 3.6 Ω. At certain torque the motor run at
speed = 1200 R.P.M and take a current of 10 Amp from the supply and
its field current is 0.5 Amp. Find starting torque, no-load speed,
and the load torque when the current supplied by the supply is 5
Amp.
A) Refer to the diagram on “Speed Control of a Shunt Wound DC Motor. Suppose the...
A) Refer to the diagram on “Speed Control of a Shunt Wound DC
Motor.
Suppose the no load voltage V = 90V, Ra +
R1 = 4 ohms, Rsh + RF = 130 ohms,
and the motor runs at a rated speed of 1000 RPM when IL
= 4 amps. What is the back EMF VB in volts when the
motor runs at IL = 6 amps?
Note: Type a 1-decimal number, rounded off to the nearest
0.1
B) How...
A DC shunt motor drives a centrifugal pump at a speed of 1000 rpm when the...
A DC shunt motor drives a centrifugal pump at a speed of 1000
rpm when the terminal voltage and line currents are 200 V and 50 A,
respectively. Given the armature resistance, Ra = 0.1 ohm and field
resistance, Rf =100 ohm. Design a circuit which the speed of the
motor can be controlled by using the added resistance method to the
armature circuit and the maximum starting current is 120 A. Next,
if the added resistance in the designed...
23 hp, dc shunt motor is running at 1000 rpm when the armature voltage is 600...
23 hp, dc shunt motor is running at 1000 rpm when the armature
voltage is 600 V. The armature resistance of the motor is 0.8 ohm,
and the field resistance is 900 ohm. The efficiency of the motor at
full load is 92 %.
a) Calculate the value of the resistance of the dynamic braking
at full load. The armature current should be limited to 150% of the
rated value.
b) If the motor operated in regenerative braking at a...
A 240 V DC shunt motor draws 40 A while driving a constant torque load. The...
A 240 V DC shunt motor draws 40 A while driving a constant
torque load. The armature resistance is Ra = 0.2 Ω, the field
resistance is Rf = 240 Ω and machine constant is Ka = 120. The part
of magnetization characteristic (field flux versus field current)
related to the question is:
If (A) : 0.70 0.80 0.86 0.90 1.00
1.10 1.20 1.30 1.40
ϕ (mWb) : 5.80 6.30 6.59 6.70 7.20 7.60 7.96 8.20 8.45
The constant rotational...
DO NOT COPY FROM PREVIOUS SOLUTIONS Design a low-voltage, high-current, shunt-excited DC motor for an industrial...
DO NOT COPY FROM PREVIOUS
SOLUTIONS
Design a low-voltage, high-current, shunt-excited DC motor for
an industrial facility.
The motor should have the following specifications:
The output power of the machine is expected to be between (50)
hp.
The copper losses in the machine should be between 4% and 7% of
the output power.
The brush losses in the machine should be between 2% and 5% of
the copper losses.
The no load power should not exceed 6% of the output...
Starting from the dynamic equations of the PM DC motor obtain the voltage-to-speed transfer function in...
Starting from the dynamic equations of the PM DC motor obtain
the voltage-to-speed transfer function in s-domain. Draw the block
diagram.
Starting from the dynamic equations of the PM DC motor obtain the voltage-to-speed transfer function in...
Starting from the dynamic equations of the PM DC motor obtain
the voltage-to-speed
transfer function in s-domain. Draw the block diagram.
For full load operation of 60Hz, 380V, 4 pole 30kW induction motor, the speed is 1746rpm,...
For full load operation of 60Hz, 380V, 4 pole 30kW
induction motor,
the speed is 1746rpm, input current 56.2A power factor 90%.
In no load operation, input current 17.3A, power factor
13.5%.
In full load operation, assume that the mechanical loss is 25% of
the total loss and no other losses.
a) Iron loss load efficiency
b) Find a rotor copper loss under full load
c) Iron loss
d) Find a fixed automatic hand under full load
e) Find the...
A 6-pole and three-phase induction motor has synchronous speed of (1000) RPM. a) Find the no-load...
A 6-pole and three-phase induction motor has synchronous speed
of (1000) RPM.
a) Find the no-load and full-load operating speed of motor for
the cases given,
1. 2.5Hz electrical frequency of rotor for no-load
condition.
2. 6.3Hz electrical frequency of rotor for full-load
condition.
b) Find the speed regulation of motor by using parameters found
above.
c) Determine the electrical frequency of rotor under full-load
condition so that speed regulation would be equal to 5%?
(Electrical frequency of rotor for...
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