ABE 110-Electric motor & Electric
motor Terms
ENGR. ALJON E. BOCOBO
Professional Agricultural Engineer
BS Agricultural Engineering – CSU, Butuan City
Master of Engineering-Renewable Energy – ADDU,
Davao City(CAR)
Review Questions & Problems
1. A current, in amperes, that a
conductor can carry continuously
under the conditions of use without
exceeding its temperature rating.
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1. Ans: Ampacity
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1.Device, or group of devices, or other
means by which the electric motor
can be disconnected from the
power supply.
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Ans: Dicconnecting
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1.Refers to how frequently the motor is
started and how long it will run each
time it is started.
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Ans: Duty rating
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1. Machine which converts electrical
energy to mechanical energy
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Ans: Elictric Motor
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1. Case or housing which prevents the
operator from accidental contact
with energized parts and protect
the motor from physical damage.
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Ans: Enclosure
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1.Maximum current required to start
the motor
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Ans: Locked-rotor current
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1.It refers to the number of individual
voltages applied to the motor
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Ans: phase
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1. Rotating part of electric motor
which is typically constructed of a
laminated steel core containing
current-carrying copper wires.
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Ans: rotor
armature winding
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1.A motor that has three individual
voltages applied
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Ans: three-phase
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1.Indicates the maximum load that
can be successfully carried by the
motor if it is to operate continuously
and remain within a safe
temperature range.
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Ans: service factor
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1. Stationary part of an electric motor
consisting of copper winding which
is placed in a laminated iron core
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Ans: stator
field poles
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1.Device which protects the motor
against overheating due to overload
or failure to start.
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Ans: Thermal protector
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1. Twisting or turning force produced
by the motor
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Ans: Torque
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1. Motor torque at zero speed or the
maximum torque required to start
the load.
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Ans: Starting torque
Locked rotor torque
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1. An electric motor where the current
is sent into the stator winding which
is placed in stationary laminated
iron core, and the armature may or
may not be a set of magnet poles.
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Ans: Alternating Current
(AC) motor
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1.Motors are small series motors up to
3.73 kW rating which are commonly
designed to operate on either direct
current or alternating current.
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Ans: Universal motor
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1.A type of DC motor, in which the
field winding is connected in parallel
with the armature
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Ans: Shunt-wound motor
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1. A type of DC motor, in which the
field winding is connected in series
with the armature
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Ans: Series-wound motor
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1. A type of DC motor, in which has
series field and shunt field winding.
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Ans: Synchronous
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1.A type of AC motor capable of
raising the power factor of systems
having large induction motor loads.
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Ans: Synchronous
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1.What is the full load current of a 10horsepower electric motor, 230-volt,
60 Hz, three-phase, 90.2% efficiency,
and 0.80 power factor?
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Sol:
𝐼=
𝑃𝑜𝑤𝑒𝑟
2
=
3 𝑉 𝐸𝑓 𝑃𝑓
10𝐻𝑝∗746
1.732∗230∗0.902∗0.80
= 25.95𝐴
THANK YOU