JPS5925026A - Motor-operated cooling fan for car - Google Patents

Abstract

PURPOSE:To provide a relatively inexpensive motor-operated cooling fan which is of a simple structure and enables to perform excellent control of speed, by a method wherein a d.c. motor, of which the rotative speed is variable, is controlled in plural speed steps from a low speed to a high speed by means of a thermoswitch. CONSTITUTION:A d.c. motor is provided on the stator side with magnets 11A, 11B, 12A, and 12B, making 2 pole pairs which cross each other at right angles, and on the rotor side with brushes 13A, 13B, 14A, and 14B, making 2 pairs, the brushes 13A and 14A being connected to the negative pole of a battery 10. With a low-temperature 15 switched ON when the temperature of a cooling water exceeds 60 deg.C, an armature current passage, in which a current flows, in order, through the switch 15, the brush 14B, a coil in the position of the magnet 12B, coils in the positions of the magnets 11A and 12A to the brushes 13A and 14A, is formed, and a motor is brought to a low-speed operating state. When the temperature of a cooling water increases and exceeds 105 deg.C, a high-temperature thermoswitch 16 is also switched ON, a coil current being generated at all the coils to bring the motor into a high-speed operating condition.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electric cooling fan for an automobile for ventilating a radiator, and more particularly to an electric cooling fan equipped with a speed control function. Is there insufficient airflow from the radiator due to the car being operated at an idling state? Supplementary information: Promoting heat dissipation from engine cooling water 1.Among these cooling fans, dynamic cooling fans whose driving source is an electric motor are direct current fans, as shown in Figure 1. 1, which is equipped with an engine 1 and a blade 2 directly connected to its rotor shaft, is placed behind a radiator 3, and is cooled by forced passage of cooling water from the engine 4 to the radiator 3 through forced passage to the radiator 3; The electric motor 1 is controlled on and off by a thermoswitch that senses the temperature of the cooling water of the engine 4.

The radiator air flow rate is adjusted and the cooling water temperature is adjusted. Figure 2 shows a conventional electric motor and its control circuit, with a pair of magnets 5A and 5B4 on the stator side, an armature coil 6 and 7 commutators on the rotor side, and a pair of brushes 8.
As a DC motor connected to A and 8B, brushes 8A and 8B
In between, electricity is applied from -battery 0 through a thermoswitch 9.

In this way, in conventional equipment where the motor is controlled on and off by a single thermoswitch, the motor is operated at the rated speed or stopped under one-stage speed control, so when switching the motor on and off, The thermoswitch 9 requires high current cutting ability, high starting power, and resistance to flow, making it large and expensive, and has the problem of accelerating the deterioration of the switch contacts.

Furthermore, since there is a sudden change in the rotation of the blades when the electric motor is switched on and off, the sound quality of the wind blowing from the blades may give a strange feeling to the occupants.

To solve these five problems, stepless speed control that gradually changes the wake pressure applied to the motor using a DC chopper or the like, or stepped speed control that switches and inserts a resistor into the armature circuit can be considered. However, these speed control devices are expensive and have poor power efficiency and reliability. .

The present invention has been developed in view of the above-mentioned circumstances, and is a DC agitating machine that is capable of changing the rotation speed of paddy grains from low to low speeds by using thermoswitches for the number of paddy grains ranging from high-temperature operating thermoswitches to low-temperature operating thermoswitches. The object of the present invention is to provide a heart motion cooling fan that enables good speed control with a relatively low speed and simple configuration by performing multi-stage speed control up to high speed.

FIG. 3 shows an embodiment of the present invention, which is a case of two-stage speed control. The M-flow motor has two pairs of magnets IIA, IIB, and 12A orthogonal to each other on the stator side.

12BY2', and two pairs of brushes 13A, 13B, 14A, 14B orthogonal to each other are provided on the rotor side. The rotor has 20 slots and is connected to coils in an overlapping manner as shown in FIG. Brush 13N.

14A is connected to the negative terminal of battery 14.
8 is connected to the battery 10 via a low temperature operating thermoswitch 15.
The brush 13B is connected to the positive electrode side of the battery IO via the high temperature operation thermoswitch 16. Low-temperature operation thermoswitch 15ba1 For example, if the cooling water temperature is 6
The high-temperature thermoswitch 16 is set to turn on when the cooling water temperature exceeds 105°C, and turns on when the cooling water temperature exceeds 105°C.

With the DC motor and thermoswitch configured as described above, the cooling water temperature is 60°B.When 15 is turned on, the coil current is shown in Fig.
-(W magnet 12B position coil) -(Magnet)
A city machine car flow path is formed that flows through the coils at the IA and 12A positions to the brushes 13A and 14A, and the IMo machine operates at low speed1.Also, the cooling water temperature rises when the DC motor is operating at low speed. When the temperature exceeds 105° C., the thermoswitch 16 is turned on, and when both switches 15 and 16 are turned on, currents are generated in all coils as shown in FIG. 5, and the motor operates at high speed.

FIG. 6 (8) shows another embodiment of the present invention, which is a case of three-stage speed control. The difference between this figure and FIG. 3 is that the brush 14A is connected to the negative electrode side of the battery 10 via a medium-temperature operating thermoswitch 17. 85°C)
The temperature is set to . In this embodiment, when the thermoswitch 15 is turned on, most of the armature's direct current flows through the magnet 12B and the coils at IIA, resulting in low-speed operation, as shown in +AI in the same figure, and the thermoswitch 15 and 1
For the ON operation of 7, as shown in Fig. 6 f81, there is a magnet)
' The armature current flows through the coils at the 12B+11A and 12A positions, resulting in medium speed operation, and the thermoswitches 15 and 1
During the ON operation of 6 and 17, current flows through all the coils as shown in □ fc) in the same figure, resulting in high-speed operation. As mentioned above, according to the present invention, the present invention enables multi-speed variable speed direct current. Equipped with an electric motor and a thermoswitch that can detect temperature in multiple stages, the speed of the DC motor is controlled in multiple stages according to the temperature of the cooling water. Better than equipment. In addition, the DC cutoff ability and DC withstand capacity of the thermoswitch are reduced to save lives, and stepwise speed control eliminates sudden changes in fan rotation, reducing the driver's discomfort. Become.

[Brief explanation of drawings]

Figure 1 is a layout diagram of a centrifugal cooling fan, Figure 2 is a circuit diagram of a conventional cooling fan DC TS machine, and Figure 3 is an embodiment of the present invention. 4 is a circuit diagram showing the reef coil coil connection diagram in FIG. 3, FIG. 5 is a diagram for explaining the operation of FIG. 3, and FIG. 6 is a circuit diagram showing another embodiment 2 of the present invention. Operation explanatory diagram 1゜l...DC motor, 10...battery, 11A, 1
1B. 12A, 12B...Magnet, 13A, 13B. 14A, 14B...Brush, 15...Low temperature operating thermoswitch, 16...High temperature operating thermoswitch, 17
...Medium temperature operating thermoswitch. ward - (N taste ward α) taste ward CD ＜ 綜〈

Claims (1)

[Claims] In a cooling fan whose driving source is a DC motor whose operation is controlled by the detection output of a thermoswitch that detects the engine coolant temperature, the DC motor has multiple pairs of brushes and the power supply circuit to each brush is changed. By doing this, the configuration KL has variable speed in multiple stages, the thermo switch has a configuration that detects the cooling water temperature in multiple stages, and the power supply circuit from the thermo switch to the motor is changed to control the speed in multiple stages. An electric cooling fan for automobiles that is characterized by: