JPH0237568U - - Google Patents

Description

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of an embodiment of a positive temperature coefficient thermistor according to the present invention, FIG. 2 is an explanatory diagram of an embodiment of a rotor in a small motor to which the embodiment shown in FIG. An explanatory diagram of a power supply circuit in a small motor to which the illustrated embodiment is applied, FIG. 4 is an explanatory diagram of another embodiment of a positive temperature coefficient thermistor in the present invention, and FIG. An explanatory diagram of an embodiment of a rotor in a motor, FIG. 6 is an explanatory diagram of a power supply circuit in a small motor to which the embodiment shown in FIG. 4 is applied, and FIG. FIG. 8 is an explanatory diagram for explaining the overheat prevention function of the positive temperature coefficient thermistor. In the figure, 1 and 2 are positive characteristic thermistors, 1-1
1 to 1-13 and 2-11 to 2-13
is the first divided electrode, 1-14 is the neutral point electrode, 2-
11' to 2-13' are second divided electrodes, 3 is a protrusion, 4-1 to 4-3 is a commutator, 4-
1' to 4-3' are commitangs, 5-1 to 5-3 are rotor windings, 5-1A to 5-3A and 5-1B to 5-3B are rotor winding terminals,
6 is an insulating member, 7 is a power supply, 14 is a motor shaft, 15
represents the rotor core.

Claims (1)

[Claims for Utility Model Registration] (1) A motor cover plate comprising a stator having a permanent magnet for forming a field and a rotor having a plurality of rotor windings wound around the rotor core. a small motor configured to supply current to the rotor winding through a commutator in sliding contact with supported power supply brushes, and having a positive temperature coefficient thermistor for controlling the current to the rotor winding; In the above, the positive temperature coefficient thermistor is formed into an annular shape, and a plurality of independent divided electrodes are formed on one electrode surface corresponding to each of the rotor windings, and one electrode is formed on the other electrode surface. The positive temperature coefficient thermistor is arranged on the commutator through an insulating member, and the positive coefficient thermistor is connected in series with the positive coefficient thermistor so that each of the rotor windings is connected in series with the positive coefficient thermistor. A small motor equipped with a positive temperature coefficient thermistor, which is connected to a divided electrode. (2) A stator with a permanent magnet for forming a field and a rotor with a plurality of rotor windings wound around a rotor core, and a brush for power supply supported on a motor cover plate. In a small motor configured to supply current to the rotor winding via a commutator in sliding contact and equipped with a positive temperature coefficient thermistor for controlling the current to the rotor winding, the positive temperature coefficient thermistor is annular. A plurality of independent first divided electrodes corresponding to each of the rotor windings are formed on one electrode surface, and each of the first divided electrodes is formed on the other electrode surface. A plurality of independent second divided electrodes are formed corresponding to the positive temperature coefficient thermistor, and the positive temperature coefficient thermistor is disposed on the commutator through an insulating member, and each of the rotor windings is connected to the positive temperature coefficient thermistor. A small motor equipped with a positive temperature coefficient thermistor, characterized in that the positive temperature coefficient thermistor is connected to a first divided electrode and a second divided electrode of the positive coefficient thermistor so as to be connected in series with the characteristic coefficient thermistor.