JPH03879Y2 - - Google Patents

Description

[Detailed description of the invention] This invention uses motors, especially in automatically controlled air conditioners for automobiles (so-called automatic air conditioners).
The present invention relates to a rotation control circuit that is effective when used in a motor that drives a fan for blowing cold or warm air into a vehicle interior.

Air conditioners that combine a heater and a cooler to control the temperature inside a car cabin throughout the year are widely used. Automatically controlled air conditioners equipped with automatic control mechanisms have come into use. This type of automatically controlled air conditioning system maintains the temperature inside the vehicle at a set temperature (for example, 25 degrees Celsius).
When the temperature inside the vehicle is lower than the set temperature, the heater is activated, and when the temperature is higher than the set temperature, the cooler is activated.

In such an automatic air conditioner, in order to quickly bring the temperature inside the vehicle to the set temperature, it is necessary to rotate the fan at high speed to blow out cold or warm air. If the temperature is close to the set temperature, it is necessary to slow down the rotation speed of the fan to maintain the temperature. In the above-mentioned automatically controlled air conditioner, the rotational speed of the motor is automatically changed in accordance with the temperature inside the vehicle, so conventionally, the first controller was used for this purpose. A control circuit as shown in the figure was used.

That is, one terminal of the motor 3 is connected to a cord 1 (including a printed wiring circuit; the same applies hereinafter) connected to one side of a power source 2, and the other terminal is connected to resistors 5, 6. , 7 are connected in series. A cord 8 branches from a part of the cord 4 closer to the motor 3 than the resistor 5, and the cord 8 branches into two cords 8a and 8b.
There are sliding contacts 9a and 9b in the form of elongated strips at both ends of the
is connected. Also, resistor 5 and resistor 6 of code 4
A cord 10 is branched from between the two cords 10a and 10b, and at both ends of the cord 10 there are elongated sliding contacts 11a and 11 in the form of strips.
b is connected. Further, a cord 12 branches from between the resistors 6 and 7 of the cord 4, and the cord 12 branches into two cords 12a and 12b.
There are sliding contacts 13a, 1 elongated in the shape of a strip at both ends of the
3b is connected. Furthermore, resistor 7 of code 4
Code 1 from the part further away from motor 3
4 is branched, and one sliding contact 15 is connected to the end of the cord 14. Each of the above-mentioned sliding contacts is symmetrical about a single sliding contact 15 connected to the cord 14, with each pair of contacts connected to the same cord 8, 10, 12 arranged in the center. Sliding contacts 9a, 11a,
13a, 15, 13b, 11b, and 9b are arranged in this order. Furthermore, in the vicinity of each of the sliding contacts 9a to 9b arranged in this way, there is a long sliding contact 16 that is continuous from the end of the contact 9a at one end to the end of the contact 9b at the other end. It is provided in parallel to the moving contacts 9a to 9b. 17 is a long sliding contact 1
6, and each of the sliding contacts 9a to 9 leading to the cord 4.
one long sliding contact and each sliding contact 9a to 9b.
The slider 17 is interlocked with the air mix door and moves upward or downward in the figure depending on the difference between the temperature inside and outside the vehicle and the set temperature.
That is, for example, when the temperature inside the vehicle is significantly higher than the set temperature, the slider 17 moves to the upper end in the figure to electrically connect the sliding contacts 9a and 16; If the temperature is significantly lower, the slider 17 moves to the lower end in the figure and the sliding contacts 9b and 16
The slider 17 moves toward the center of the sliding contact 16 as the vehicle interior temperature approaches the set temperature. Such movement of the slider 17 is automatically performed by an actuator or the like (not shown) connected to a thermostat.

A single contact 19 is connected to the other end of the cord 18, which has one end connected to one long sliding contact 16, and another single contact 20 provided near the single contact 19, The end of the cord 4 leading to the motor 3 is connected via the resistors 5, 6, and 7 described above. Furthermore, another single contact 21 is provided on the extension of both single contacts 19 and 20, and this single contact 21 is connected directly to the terminal of the motor 3 through a cord 22 without passing through a resistor. Each single contact 19, 20,
A long sliding contact 23 in the shape of a strip is provided near the contact 21 in parallel with the arrangement of the single contacts 19, 20, 21. 24 is the sliding contact 23 and each single contact 1
The slider 24 is a slider for switching the electrical connection with the terminals 9, 20, and 21, and the slider 24 is manually switched by a lever provided on the driver's seat or the like. A sliding contact 23 is connected to the cord 1 and the other side of the power source 2. 25 is an isolated contact with which the slider 24 comes into contact when stopping the rotation of the motor 3.

When the rotation of the fan motor 3 is controlled by the control circuit configured as described above, the slider 2 on the right side of the figure is required to automatically control the rotation of the motor.
4 is positioned so as to span between the sliding contact 23 and the single contact 19 as shown by the solid line in the figure. When the slider 24 is positioned in this manner, the rotational speed of the motor 3 is automatically controlled by the position of the other slider 17. That is, when the temperature inside the vehicle cabin deviates significantly from the set temperature, the slider 17 moves significantly upward (or downward) in the figure and electrically connects the sliding contact 16 and the sliding contact 9a or 9b. let Therefore, the current from the power source 2 is input to the motor 3 without passing through any resistance, and the motor 3 rotates at high speed. When the temperature inside the vehicle gets a little close to the set temperature, slider 1
7 moves slightly inward to electrically connect the sliding contact 16 and the sliding contact 11a or 11b. Therefore, the current from the power source 2 is input to the motor 3 through the resistor 5, and the motor 3 rotates at a medium speed. When the temperature inside the vehicle compartment approaches the set temperature, the slider 17 moves further inward and brings the sliding contact 16 into electrical contact with the sliding contact 13a or 13b. Therefore, the current from the power source 2 is input to the motor 3 through the two resistors 5 and 6, and the motor 3 rotates at a medium to low speed. When the temperature in the vehicle interior approaches the set temperature, the slider 17 moves to approximately the center of the sliding contact 16 and brings the sliding contact 16 and the sliding contact 15 into electrical contact. For this reason, power supply 2
The current is input to the motor 3 through three resistors 5, 6, and 7, and the motor 3 rotates at a low speed. Next, in order to rotate the motor 3 at high speed by manual switching, move the slider 24 and make electrical contact between the sliding contact 23 and the single contact 21, so that the current from the power source 2 does not pass through the resistance at all. The motor 3 rotates at high speed. To manually rotate the motor 3 at a low speed, if the sliding contact 23 and the single contact 20 are electrically connected by the slider 24, the current from the power source 2 passes through the three resistors 5, 6, and 7. The motor 3 rotates at a low speed.

However, the conventional motor rotation control circuit constructed and operated as described above has the following drawbacks when the motor 3 is manually rotated at a low speed. That is, each sliding contact 9a, 11 leads to the cord 4 via the cords 8, 10, 12.
a, 13a, 15, 13b, 11b, and 9b are arranged so that the slider 17 is always in contact with any one of the sliding contacts so that the rotation of the motor does not stop during automatic control. There is. Therefore, when the slider 17 moves to a position exactly in the middle of two adjacent sliding contacts, the two sliding contacts are brought into electrical contact. For example, if the slider moves to the position shown by the chain line in FIG.
and a will be electrically connected. Therefore, when the motor 3 is manually rotated at a low speed, the resistor 6 is short-circuited through the cords 12, 12a, the sliding contact 13a, the slider 17, the sliding contact 11a, and the cords 10a, 10. Therefore, from power supply 2 to motor 3
The current flowing through the motor 3 passes through the two resistors 5 and 7, and the motor 3 rotates at a slightly faster speed than its original low speed. The slider 17 moves regardless of the position of the other sliders 24, even during manual control, and regardless of the manual control, and as described above, one resistor is short-circuited and the rotation of the motor 3 is stopped. The phenomenon of speeding up always occurs when the slider moves between adjacent sliding contacts (the shorted resistance differs each time), so when manually driving the motor 3 at a low speed, the rotation of the motor 3 often increases. The speed may suddenly increase, which is undesirable as it causes discomfort to the passengers. In addition, the automatic control circuit sets the motor speed considering the case where all the passengers are in the car, so if only the driver's seat is in the car, the rotation will be too fast even at low speeds and the noise will be loud.

The present invention aims to provide a motor rotation control circuit that does not have the above-mentioned drawbacks.

Hereinafter, the present invention will be explained with reference to drawings showing embodiments.

FIG. 2 shows an embodiment of the present invention.
Components equivalent to those of the conventional example shown in the drawings are given the same reference numerals, redundant explanations are omitted, and only the features of the present invention will be explained. That is, three resistors 5,
The end of the cord 4 in which 6 and 7 are connected in series is connected only to the cord 14 which leads to the central sliding contact 15. Therefore, three resistors 5, 6, 7
is used only when automatically controlling the rotation of the motor 3, and the three resistors 5, 6, and 7 are irrelevant when controlling the rotation of the motor 3 manually. Therefore, when manually rotating the motor 3 at a low speed, one end of a newly provided cord 26 is connected to the single contact 20 that makes electrical contact with the sliding contact 23 via the slider 24, and the other end of the cord 26 is is connected to the terminal of motor 3. A resistor 27 is connected in series in the middle of the cord 26, and the resistance value of the resistor 27 is made larger than the sum of the resistance values of the three resistors 5, 6, and 7 described above.

In order to rotate the motor 3 at low speed in the circuit configured as described above, if the slider 24 is moved to a position where the sliding contact 23 and the single contact 20 are crossed, the power source 2 can be rotated. The current is code 26, resistance 2
7 to the motor 3, and the motor 3 is rotated at a low speed. At this time, the other slider 17 moves as the temperature inside the vehicle increases, but the motor 3 always rotates at a low speed regardless of the position of the slider 17, which is slower than the low speed rotation during automatic control. , rotates with less noise.

Since the motor rotation control circuit of the present invention is configured and operates as described above, it is possible to set the motor rotation speed to the optimum speed according to the situation, and it does not cause discomfort to the occupant during manual operation. It has great practical effects, such as no problems.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of a conventional example, and FIG. 2 is a circuit diagram showing an embodiment of the present invention. 3: Motor, 5, 6, 7: Resistor, 9a, 9b,
11a, 11b, 13a, 13b, 15, 16,
23: Sliding contact, 17, 24: Slider, 20, 2
1: Single contact, 27: Resistance.

Claims (1)

[Scope of utility model registration request] A long sliding contact 16, and a plurality of comparatively short sliding contacts 9a, which are provided parallel to and close to the contact 16 and connected to each connection end of a plurality of series resistors 5, 6, and 7 connected to the motor. , 11a, 13a,
15, 13b, 11b, 9b, and a slider that is spanned between the aforementioned long sliding contact 16 and a plurality of sliding contacts and slides as the difference between the set temperature and the temperature inside and outside the vehicle changes. In the automatic control circuit consisting of 17,
Sliding contact 23 and single contact 2 by manual switching
In a motor rotation control circuit that is equipped with a manual control circuit that has a switching contact that converts the electrical connection between 0, 21, and 19 and rotates the motor 3 at low speed, high speed, or automatically, the motor 3 can be manually rotated at low speed. The single contact 20 electrically connected to the sliding contact 23 and the terminal of the motor 3 are connected in series through a resistor 27 having a resistance value greater than the sum of the resistance values of the series resistors 5, 6, and 7. A motor rotation control circuit characterized in that: