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6.2.13 Two-value capacitor motor. - A two-value capacitor motor is a capacitor motor using different
values of effective capacitance for the starting and running conditions (see 3.1.11).
6.2.14 Shaded pole. - A shaded-pole motor is a single-phase induction motor provided with an auxiliary
short-circuited winding or windings displaced in magnetic position from the main winding (see 3.1.11).
6.2.15 Split phase. - A split-phase motor is a single-phase induction motor equipped with an auxiliary
winding, displaced in magnetic position from, and connected in parallel with the main winding. Unless other-
wise specified herein, the auxiliary circuit is assumed to be opened when the motor has attained a predeter-
mined speed. The term split-phase motor used without qualification describes a motor to be used without
impedance other than that offered by the motor windings themselves, other types being separately defined
(see 3.1.11).
6.2.16 Universal. - A universal motor is a series-wound motor or a compensated series-wound motor
which may be operated either on direct-current or single-phase alternating-current at approximately the same
speed and output. These conditions must be met when the direct current and alternating-current\voltages are
approximately the same and the frequency of the alternating-current is not greater than 60 cycles per second
(see 3.1. 11).
6.2.17 Squirrel-cage induction. - A squirrel-cage induction motor is one in which the secondary circuit
consists of a squirrel-cage winding suitably disposed in the secondary core (see 3.1.11).
6.2.18 Synchronous. - A synchronous motor is a motor in which the average speed of normal operation
is exactly proportional to the frequency of the system to which it is connected (see 3.1.11).
6.2.19 Efficiency. - The efficiency of a machine is the ratio of the power output to the total power input.
6.2.20 Thermal protector (inherent overheating protective device). - A thermal protector is a protective
device which is responsive to motor current and temperature whose purpose, when applied to a motor, is to
protect the motor against excessive overheating due to overload or failure to start.
6.2.21 Fractional horsepower-motor. - A fractional horsepower motor is one built in a frame of any
size smaller than 182.
6.3 CHANGES FROM PREVIOUS ISSUE. THE EXTENT OF CHANGES (DELETIONS, ADDITIONS, ETC.)
PRECLUDE THE ANNOTATION OF THE INDIVIDUAL CHANGES FROM THE PREVIOUS ISSUE OF THIS
DOCUMENT.
Preparing activity:
Navy - SH
(Project 6105-NO21SH)
31/32
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