JPS5847367B2 - Control device for blower motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control device for a blower motor, and more particularly to a blower motor control device suitable for use in an automobile air conditioner or the like.

When retrofitting a conventional heating heater to an automobile and upgrading it to an air conditioner for heating and cooling, it is necessary to control the motor for a small-capacity blower for the heater and the rotational speed of the motor. The heat resistor for adjusting the air volume was removed and replaced with a larger capacity blower motor for the air conditioner and an air conditioner resistor for controlling the motor.

For this reason, in order to improve the heater into an air conditioner, it is necessary to replace the control resistor as well as the blower motor, which has the disadvantage of requiring a lot of work and extra cost.

An object of the present invention is to eliminate the drawbacks of the prior art described above, and to provide an economical blower motor control device that can be used in common with a small-capacity blower motor for heat and a larger-capacity blower motor for air conditioners. is to provide.

The present invention provides a resistance circuit including a plurality of resistors for controlling the current of the motor, which is inserted between a drive power supply and a blower motor connected to the power supply, and a resistance circuit of the resistance circuit according to a desired air volume. In addition to an air volume changeover switch that partially changes the connection of the resistor to make the value variable, there is also an air volume changeover switch that partially changes the connection of the resistor, or when the blower motor is a larger capacity blower motor for an air conditioner or when the blower motor is for a heater. A blower connection changeover switch is provided that changes the resistance value of the resistance circuit depending on the case of a smaller capacity blower motor, and the blower is shared by a heater blower motor and an air conditioner blower motor. The present invention provides a control device for a commercial electric motor.

Embodiments of the present invention will be described in detail below based on the drawings.

The drawing is an electric circuit diagram showing one embodiment of the control device for a blower motor according to the present invention. In the drawing, 1 is a battery as a driving power source, 2 is a key switch, 3 is a protective fuse, and 4
is an air volume switch to change the air volume of the blower,
41, 42, and 43 are low, medium, and high volume contacts, respectively, of the air volume selector switch 4; 5, 6.7 are resistors with resistance values R1, R2, and R3, respectively, constituting a resistance circuit; 8 is a blower connection 81 and 82 are the heating operation contact and cooling operation contact of the blower connection changeover switch 8, respectively.
9 is a small-capacity blower motor for a heater and a large-capacity blower motor for an air conditioner, which are replaced as appropriate; 1
0 is ground.

In the figure, a battery 1 whose negative terminal is grounded to ground 10
from the positive terminal of key switch 2 and protective fuse 3.
It is connected to the common contact side of the air volume selector switch 4 through the .

This air volume selector switch 4 has a low volume contact 41, a medium volume contact 42, and a high volume contact 43 that can switch the air volume of the blower into three stages, low volume, medium volume, and high volume, respectively, and the low volume contact 41 is It is connected to the heating operation contact 81 of the blower connection changeover switch 8 through a resistance circuit made up of series connections of resistors 5, 6, and 7, and its intermediate contact 42 is connected to the connection point of resistors 5 and 6. The high-volume contact 43 is connected to the connection point between the resistors 6 and 7 and to the cooling operation contact 82 of the blower connection changeover switch 8.

Furthermore, the common contact side of this blower connection changeover switch 8 is connected to one end of a blower motor 9, and the other end of the blower motor is connected to ground 10.

To explain the operation of the device configured in this way, first, in the case of a small-capacity blower motor for the heater of the blower motor 9, the blower connection changeover switch 8 is closed to the contact 82 side during cooling operation.

In this state, when the key switch 2 is turned on and the air volume selector switch 4 is turned on to the low volume contact 41 side, the current control resistor of the blower motor 9 inserted between the drive power supply 1 and the blower motor 9 The resistors of the circuit are resistors 5 and 6, and their resistance value is R1+R2.

Also, when the air volume selector switch 4 is turned on to the medium volume contact 42 side, only the resistor 6 is inserted in the resistance circuit.
Its resistance value is R1.

Furthermore, when the air volume changeover switch 4 is turned on to the high volume contact 43 side, the resistor of the inserted resistance circuit disappears, and its resistance value is zero.

Therefore, if the air volume selector switch 4 is switched to the low flow contact 41, the medium flow contact 42, or the high flow contact 43, the resistance value of the current control resistor circuit decreases in three stages accordingly, and the resistor circuit is connected to the power source 1. Since the current flowing through the blower motor 9 increases and the rotational speed of the blower motor increases,
You can change the air volume to small, medium, or high as desired.

Next, when an air conditioner is retrofitted and the heater is reclassified as an air conditioner, if the blower motor 9 is replaced with a larger capacity blower motor for the air conditioner, the air conditioner will be operated for heating and cooling. Depending on the time, the blower connection changeover switch 8 is switched to the contact 82 side for cooling operation or the contact 81 side for heating operation.

First, during cooling operation, the blower connection changeover switch 8 is turned to the cooling operation contact 82 side.

Therefore, after turning on key switch 2 in this state,
If the air volume selector switch 4 is switched to the low flow contact 41, the medium flow contact 42, or the high flow contact 43, the resistance value of the current control resistor circuit will change to R in exactly the same way as in the case of the heater blower motor. , +R2, R2, or zero.
You can change the air volume to small, medium, or high as desired.

In this case, even if the resistance values are the same as those for the heater, the respective air volumes may differ due to differences in the characteristics of the blower motors.

Then, during heating operation, the blower connection changeover switch 8 is switched to the heating operation contact 81 side and turned on.

In this state, when the key switch 2 is turned on and the air volume selector switch 4 is turned on to the low volume contact 41 side, the resistor of the current control resistor circuit inserted between the drive power supply 1 and the blower motor 9 resistors 5, 6 and 7,
Its resistance value is R1+R2+R3.

Further, when the air volume changeover switch 4 is turned on to the medium volume contact 42 side, the resistors of the resistor circuit to be inserted are 6 and 7, and the resistance value thereof is R2+R3.

Further, when the air volume changeover switch 4 is turned on to the high volume contact 43 side, only the resistor 7 is inserted in the resistance circuit, and its resistance value is R3.

Therefore, if the air volume selector switch 4 is switched to the low flow contact 41, the medium flow contact 42, or the high flow contact 43, the resistance value of the current control resistor circuit decreases in three stages accordingly, and the resistor circuit is connected to the power source 1. Since the current flowing through the blower motor 9 increases and the rotational speed of the blower motor increases, the air volume can be changed to a desired small, medium, or high amount, respectively.

Moreover, the resistance value of the resistance circuit inserted during this heating operation is higher than the resistance value during the cooling operation, the resistance value R3 of the resistor 7 at the same closing contact position of the air volume changeover switch 4.
Since it is thicker, the current flowing through the blower motor 9 is reduced compared to during cooling operation, the rotation speed is lowered, and the air volume is also lowered, so the air volume during heating operation is not excessive and the air volume is comfortable. I can be hatched.

The resistance values of the resistance circuit inserted between the drive power source 1 and the blower motor 9 during each of the above operations are shown in the table below.

According to the above embodiment, there is provided a resistance circuit including a plurality of resistors for current control inserted between the drive power supply and the blower motor, and a resistance circuit provided on the input side of the resistance circuit to adjust the resistance according to the desired air volume. In addition to an air volume changeover switch for changing the resistance value of the resistance circuit, a blower connection changeover switch is provided on the output side of the resistance circuit and separately changes the resistance value of the resistance circuit depending on the capacity and usage of the blower motor. Therefore, even if the blower motor is replaced from a heater motor to an air conditioner blower motor, the blower motor can be used as is, so the resistor of the control resistance circuit can be used together with the blower motor as in the past. It eliminates the complexity of replacing the parts, making it simple and easy to use, and has the effect of improving control characteristics and economic efficiency.

In addition, in the example, we described how to change the capacity of the electric motor when used as a heater alone and when used as an air conditioner, but the capacity of the electric motor is changed when used as a heater alone and when used as an air conditioner. If you use a high-capacity electric motor and use heat alone, switch 8 to connect the blower.
It can also be used by switching to the contact 81 side during heating operation, and when used as an air conditioner, switching to the contact 82 side during cooling operation.

In this case, the electric motor itself can be shared, which is more economical.

As described above, according to the blower motor control device of the present invention, the resistors in the resistance circuit can be switched using the blower connection switch in addition to the air volume switch. There is no need to replace the unit, and it can be used easily and economically, especially when replacing motors for automobile heaters and blowers for air conditioners.

[Brief explanation of the drawing]

The figure is an electric circuit diagram showing an embodiment of a control device for a blower motor according to the present invention. 1...Drive power supply, 4...Air volume selection switch, 5 6 7...Resistor, 8...Blower connection selection switch, 9... ...Electric motor for blower.

Claims (1)

[Scope of Claims] 1. A driving power source, a blower electric motor driven by the driving power source, and a plurality of electric blower motors connected between the driving power source and the blower electric motor for controlling the current of the blower electric motor. A resistor circuit comprising a resistor, and an air volume changeover switch that switches the connection of the resistor of the resistor circuit to an appropriate position in order to vary the resistance value of the resistor circuit according to the required air flow rate, Another resistor is provided in series between the motor and the resistor circuit, and the resistor circuit is connected to the resistor circuit depending on whether the blower motor is a small-capacity motor for a heater or a large-capacity motor for an air conditioner. A blower connection changeover switch is provided for switching between connecting the other resistor in series and connecting the resistor circuit and the blower motor directly between the resistor circuit and the blower motor. A control device for a blower motor, characterized in that an assembly of a switch, another resistor, and a changeover switch for connecting the blower is used for both a heater and an air conditioner. 2% Allowance In the invention described in claim 1, the blower connection changeover switch is configured to switch whether the air conditioner is in a heating state or a cooling state when the blower motor is a large-capacity motor for an air conditioner. A blower motor having a function of switching between connecting the other resistor in series between the resistance circuit and the blower motor and directly connecting the resistance circuit and the blower motor. control device.