JPS591439Y2 - Fan motor control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a control device for a fan motor incorporated in a fan device such as a car cooler.

A conventional control device 1 of this type connects a motor M to which a fan is attached to a resistor circuit 2, as shown in FIG. A changeover switch 3 and an automatic changeover switch 4 are provided, and the current is controlled and the rotational speed of the motor M is controlled by switching these switches.

However, in this device 1, after controlling the rotation using the automatic changeover switch 4, the manual changeover switch 3 is turned off.
When switching from O contact 5 to L contact 6 (low speed contact), in the state shown in the figure, even though switch 3 is in L contact 6, it appears to be in M contact 7 (medium speed contact). There was an inconvenience that similar rotations were performed.

That is, in this automatic changeover switch 4, the H contact 8 (high speed contact),
M1 contact 9 (relatively high speed medium speed contact), M2 contact 10
(relatively low speed medium speed contact) and L contact 11 (low speed contact) are provided, and when each of these contacts is independently connected to the moving path 16 by the slider 12, each contact The motor M is configured to rotate at the corresponding speed described above.

By the way, when switching from one contact to another,
For example, as shown in FIG. 1, when switching from contact 10 to contact 11, slider 12 is connected to the end of contact 10 and contact 1
1 (hereinafter referred to as wrapping) so as to simultaneously contact the ends of the moving path 16.

By wrapping the slider 12 and connecting it to the moving path 16 in this way, the circuit is prevented from becoming disconnected when switching the contacts, and this prevents the motor M from being energized. is ensured without fail, making automatic control of the motor rotation speed possible.

However, in this wrapped state (in Figure 1, M2 contact 10
and L contact 11 overlap.

) For example, change the slider 13 of the manual switch 3 to the Auto contact 5.
When switching from L contact 6 to L contact 6, the current flows from motor M to resistor R.
1 → Resistor R2 → Conductor 14 → Contact 10 → Slider 12 → Contact 11 → Conductor 15 → L contact 6, and the resistor R3 is short-circuited, and the motor M rotates one step higher than the low speed of L contact 6. It will rotate at medium speed.

Furthermore, when the M1 contact 9 and the H contact 8 overlap, the resistor R1 is short-circuited, and the rotation is still not the low speed rotation of the L contact 6.

The present invention was developed in order to eliminate the above-mentioned defects, and includes a resistance circuit provided to change the rotation speed of the fan motor in multiple stages, and a multi-contact manual switching system that appropriately selects the resistance value of this resistance circuit. A switch, a slider connected to an automatic changeover contact provided on the manual changeover switch, and a fixed contact connected so as to change the resistance value of the resistor circuit, the slider selecting the fixed contact. In the control device for both manual and automatic use, the fixed contacts are arranged on both sides of a moving path of the slider, and the slider sliding on this moving path is connected to the fixed contacts on both sides. It consists of a pair of independent slider pieces that are in contact with the contacts but have no conduction to each other, and by connecting each slider piece to the automatic switching contact, each switch rotates according to the contact instructions. An object of the present invention is to provide a fan motor control device that performs the following steps.

Hereinafter, the control device according to the present invention will be explained with reference to the drawings.

FIG. 2 is a circuit diagram showing an embodiment of the control device,
The same members as those shown in FIG. 1 are given the same reference numerals.

The motor M connected to the power supply 20 is connected to a resistance circuit 2, which has three resistances R1, R2, and R3 arranged in series, each having its own resistance value, and the other end connected to a manual changeover switch 3. It is connected to L contact 6 of .

This manual switch 3 has an OFF contact as well as an Auto contact 21. Each contact is selected by sliding the slider 13, which has the above-mentioned contacts 6, M contacts 7, and H contacts 8, and is placed on the moving path 22.
The o-contact 21 has two contacts, and each contact is connected to the movement paths 24 a and 24 b of the automatic changeover switch 23 .

This automatic switch 23 has a pair of moving paths 24a, 24
Fixed contacts 8 to 11 are provided in a staggered manner left and right with b as the center, and these fixed contacts 8 to 11 and the moving paths 24a, 24
The slider 25 that slides on b comes into contact with it.

These fixed contacts 8 to 11 are connected so that the resistance value of the resistance circuit 2 changes, and the H contact 8 is connected to the motor M and M1.
Contact 9 connects the connection point between resistor R1 and resistor R2 and M2.
The contact 10 is connected to the connection point between the resistors R2 and R3, and the L contact 11 is connected to the L contact 6 of the manual switch 3.

The motor rotation at each of these contacts is similar to the motor rotation in the conventional example.

The reason why there are two of each of the H, M, and M2 contacts is so that the speed of the motor M can be controlled by operating the slider 25 either up or down with the L contact 11 as the center. Also, each slider piece 25a of this slider 25,
25b is automatically operated as one body by a motor drive system operated by a signal from an amplifier installed in the vehicle or by a hydraulic piston, but there is no conduction between the slider pieces.

Next, the effect will be explained.

To automatically switch the rotation of the motor, set the slider 13 of the manual switch 3 to the Auto contact 21.

In this case, if the slider 25 of the automatic changeover switch 23 is in the state shown in the figure, the motor will rotate at a relatively low medium speed because a circuit to be described later will be formed.

That is, the current from the power source 20 is transmitted through the resistors R, , R, → conductor 26 → M2 contact 10 → slider piece 25 a → moving path 24
→ Conductor 27 a-*Auto contact 21 → Slider 13 → Moving path 22, and the motor M is rotated at a relatively low medium speed.

Here, the slider piece 25 b of the automatic changeover switch 23
The other side may also be in contact with the L contact 11, but even in such a contact state, the current flows through the circuit with lower resistance, so the resistors R1 and R2 and R3 are electrically connected. A circuit flowing to the L contact 11 is not configured.

Then, in the automatic changeover switch 23 as described above,
Even if the slider 13 of the manual switch 3 is moved to the L contact 6 when a wrap condition occurs, the slider piece 25 a
, 25b, the current does not short-circuit the resistor R3 and flow as in the conventional case.

In other words, the current flowing out of resistor R1 is resistor R2 → conductor 26 →
M2 contact 10 → slider piece 25 a → slider piece 25b-+
There is no flow from the L contact 11 to the conductor 28 to the L contact 6.

Therefore, by switching to manual mode, the motor can be made to rotate as instructed by the switch.

As is clear from the above description, according to the present invention, when configuring an automatic changeover switch, fixed contacts are arranged on both sides of the slider movement path, and the slider sliding on this movement path is A pair of independent slider pieces that are in contact with the fixed contacts on both sides and have no conduction to each other are connected to the automatic changeover contact, so that the automatic changeover switch and the manual This provides an excellent effect in that the action of the changeover switch is clearly separated, and the setting of the switch and the rotation of the motor are reliably matched.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of a conventional fan motor control device, and FIG. 2 is a circuit diagram of a fan motor control device according to the present invention. 2...Resistance circuit, 3...Manual changeover switch, 6゜7...Contact, 8,9,10.11.
...Fixed contact, 13.25...Slider,
20...Power supply, 21...Auto contact, 16, 22, 24a24 b...Movement path,
25a, 25b...Slider pieces.

Claims (1)

[Scope of utility model registration request] Connected to a resistance circuit provided to change the rotation speed of the fan motor in multiple stages, a multi-contact manual changeover switch that appropriately selects the resistance value of this resistance circuit, and an automatic changeover contact provided on this manual changeover switch. and a fixed contact connected to change the resistance value of the resistance circuit,
In a manual and automatic control device configured such that the slider selectively connects fixed contacts, the fixed contacts are arranged on both sides of a movement path of the slider, and the slider slides on this movement path. A fan motor comprising a pair of independent slider pieces that are in contact with the fixed contacts on both sides and have no conduction to each other, and each slider piece is connected to the automatic switching contact. control device.