JPH0932417A - Window regulator driving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To arm at smooth operation by switching voltage polarity so as to correspond to the motor rotating direction in response to the input of the up/ down operation of a window glass, and changing an output voltage of one polarity so as to lower the voltage at the time of down-operation in comparison with the voltage at the time of up-operation. SOLUTION: When an indication of the up/down operation of a window glass is input by a polarity change over switch 1, voltage polarity from a battery B is switched so as to correspond to the rotating direction of the motor B. A voltage control unit 2 changes an output voltage of at least one polarity in response to the polarity of the voltage switched by the switch 1, and supplies the voltage lower than the voltage at the time of up operation to a motor 23 at the time of down operation. A lowering speed to be accelerated by the weight of a window glass is lowered, and while, the impact at the time of abutment of the window glass and a stopper is moderated. Furthermore, since a motor torque at the time of constraining the bottom dead center of the window glass is lowered, a burden to be applied to a wire and a gear is reduced. The lowering speed is thereby lowered, and smooth lowering is enabled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a window regulator that raises / lowers a window glass by using a rotational force of a motor, and more particularly, a window regulator driving device that supplies a motor driving voltage to a motor of the window regulator. / Regarding the improvement of the descending speed.

[0002]

2. Description of the Related Art In a power type window regulator for raising / lowering a window glass by the power of a motor (hereinafter, also simply referred to as lifting / lowering), lifting / lowering is realized by driving a wire or an arm by a rotating force of a motor. .

[0003] In such a case, when the voltage from the battery is supplied to the motor, the polarity is switched by a changeover switch, thereby switching the normal rotation / reverse rotation of the motor. And
The forward / reverse rotation of this motor raises / lowers the window glass.

[0004]

By the way, since the above-mentioned elevation is switched by switching the polarity of the voltage supplied to the motor, the rotation direction of the motor is reversed but the generated torque is the same.

In this case, the ascending speed and the descending speed differ depending on the weight of the window glass and the mounting portion thereof.
That is, the speed decreases due to the weight of the window glass or the like when rising, whereas the speed increases due to the weight of the window glass or the like when descending. As a result, there will be a difference in speed between ascent and descent.

Further, as a result of the increase in the descending speed as described above, when stopping at the lowest position, a large impact occurs when the window glass mounting portion collides with a stopper or the like for restricting the stop position. There is. Such an impact may cause a problem that a sound is generated or a mechanical impact reduces durability of each part.

The present invention has been made in order to solve the above various problems, and an object thereof is to realize a window regulator drive device capable of eliminating or adjusting a speed difference between rising and falling. It is to be.

[0008]

SUMMARY OF THE INVENTION The inventor of the present application has found that a conventional power type window regulator drive device
As a result of intensive research to improve the problem of the speed difference of the descending speed, a new method of adjusting the speed difference of the ascending / descending by adjusting the driving voltage of the motor by using a simple structure was found, and the present invention was made It has been completed.

Therefore, the present invention, which is means for solving the problems, is configured as follows. The first invention is
A window regulator drive device that supplies a motor drive voltage to a window regulator that raises / lowers a window glass by using the rotational force of a motor, and receives an instruction to raise / lower the window glass. According to the polarity of the voltage switched by the switching means and the switching means for switching the voltage polarity from the power supply means in accordance with the rotation direction of the motor, the output voltage is changed in at least one of the polarities when the window glass descends. And a voltage control means for supplying a voltage lower than that at the time of rising to the motor.

In this case, it is preferable that the voltage control means lowers at least the lowering voltage than the voltage from the power supply means. According to the first aspect of the present invention, when an instruction to raise / lower the window glass is input to the switching means, the voltage polarity from the power supply means is switched according to the input in accordance with the rotation direction of the motor, and the switching is performed in this manner. The voltage control means changes the output voltage in at least one of the polarities according to the polarity of the voltage, and supplies a lower voltage to the motor when the window glass descends than when it rises.

As a result, the descending speed accelerated by the weight of the window glass can be reduced, and a window regulator driving device capable of eliminating or adjusting the speed difference between the ascending and descending speeds. It will be realized.

A second aspect of the present invention is a window regulator drive device for supplying a motor drive voltage to a window regulator that raises / lowers a window glass by utilizing the rotational force of a motor. A / down instruction is input, and in accordance with this input, a switching unit that switches the voltage polarity from the power supply unit according to the rotation direction of the motor, and two types of values that differ according to the polarity of the voltage switched by the switching unit. A window regulator driving device comprising: a voltage control unit that generates an output voltage and supplies a lower voltage to the motor when the window glass is descending than when it is rising.

According to the second aspect of the present invention, when an instruction to move up / down the window glass is input to the switching means, the voltage polarity from the power source means is switched according to the input, according to the rotation direction of the motor. The voltage control means generates two types of output voltages having different values in accordance with the polarity of the voltage switched to, and supplies a lower voltage to the motor when the window glass is descending than when it is rising.

As a result, the descending speed accelerated by the weight of the window glass can be reduced, and a window regulator driving device capable of eliminating or adjusting the speed difference between the ascending and descending speeds. It will be realized.

A third aspect of the present invention is a window regulator drive device for supplying a motor drive voltage to a window regulator that raises / lowers a window glass by utilizing a rotational force of a motor, and the window regulator rises. A / down instruction is input, and in accordance with this input, switching means for switching the voltage polarity from the power supply means in accordance with the rotation direction of the motor, and the output voltage is changed according to the polarity of the voltage switched by the switching means, A window regulator driving device comprising: a voltage control unit including a rectifying unit and a voltage dividing resistor unit for supplying a voltage lower than that when the window glass is rising to the motor.

In this case, when the voltage rises, a current flows through the rectifying means in the forward direction to reduce the voltage drop, and when the voltage drops, the rectifying means reverses and is cut off, and the voltage drop of the voltage dividing resistance means reduces the voltage. Is preferably supplied to the motor.

According to the third aspect of the present invention, when an instruction for raising / lowering the window glass is input to the switching means, the voltage polarity from the power source means is switched according to the input in accordance with the rotation direction of the motor. The voltage control means changes the output voltage according to the polarity of the voltage switched to, and supplies a voltage lower than that at the time of ascending to the motor when the window glass descends.

At this time, in the voltage control means composed of the rectifying means and the voltage dividing resistance means, a current flows through the rectifying means in the forward direction when the window glass is raised, so that the voltage drop is small. On the other hand, when the voltage drops, the rectifying means reverses and is cut off, and a voltage drop occurs in the voltage dividing resistance means. As a result, a voltage lower than that at the time of rising is supplied to the motor at the time of falling.

As a result, it becomes possible to reduce the descending speed accelerated due to the weight of the window glass, and a window regulator drive device capable of eliminating or adjusting the speed difference between the ascending and descending speeds. It will be realized.

A fourth aspect of the present invention is a window regulator drive device for supplying a motor drive voltage to a window regulator that raises / lowers a window glass by utilizing a rotational force of a motor, and the window regulator rises. A / down instruction is input, and in accordance with this input, switching means for switching the voltage polarity from the power supply means in accordance with the rotation direction of the motor, and the output voltage is changed according to the polarity of the voltage switched by the switching means, In order to supply a lower voltage to the motor when the window glass is descending than when it is ascending, voltage control means composed of a constant voltage source that generates different constant voltages depending on the polarity of the voltage is provided. It is a wind regulator drive device that operates.

In this case, the constant voltage source includes various voltage sources such as a series power source, a chopper and a switching power source. According to the fourth aspect of the invention, when an instruction to move up / down the window glass is input to the switching means, the voltage polarity from the power supply means is switched according to the input in accordance with the rotation direction of the motor, and the switching is performed in this manner. The constant voltage source of the voltage control means generates a constant voltage lower than that when the window glass descends and supplies it to the motor according to the polarity of the voltage thus obtained.

As a result, the descending speed accelerated by the weight of the window glass can be reduced, and a window regulator drive device capable of eliminating or adjusting the speed difference between the ascending and descending speeds. It will be realized.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a configuration diagram showing an embodiment which is a principle configuration of a window regulator drive device of the present invention. FIG. 2 is a configuration diagram showing the mechanism of the window regulator.

First, the mechanism of the window regulator and its operation will be briefly described with reference to FIG. Here, a description will be given of an example of the structure of a wire-type window regulator mechanism for a vehicle that raises and lowers a window glass using a wire.

Reference numeral 21 is a door, and 21a is a door inner plate mounted inside the door 21. Reference numeral 22 is a window glass which is driven to move up and down as described later. Reference numeral 23 is a motor that generates a rotational force, and is attached to a base 24. The base 24 is fixed to the door inner plate 21a with bolts or the like. Reference numeral 25 is a guide, which is a holder 26 that engages with a bracket 27 fixed to the lower end of the window glass 22.
It will guide you up and down. Reference numerals 28 and 29 denote attachment plates attached to the upper and lower ends of the guide 25 with respect to the door inner plate 21a. Reference numerals 30 and 31 denote pulleys mounted on the mounting plates 28 and 29, respectively, for guiding the wire 33.

Reference numeral 26a is a stopper for restricting the lower limit position when the window glass 22 descends, and the cushion 26b and the holder 26 contact at this lower limit position. Further, the teeth of the output gear 34 fixed to the output shaft of the motor 23 are
Is engaged with the drum 36 by the rotation of the motor 23.
Rotates. A screw groove is provided on the outer circumference of the drum 36, and the wire 33 is wound along the groove.

In such a window regulator mechanism, when the motor 23 is driven by the window regulator driving device described later, the rotational force of the motor 23 is changed to the gear 34.
And 35 to the drum 36. The rotation of the drum 36 moves the entire wire 33. And
The window glass 22 connected to the wire 33 via the holder 26 and the bracket 27 moves in the vertical direction. here,
By switching the rotation direction of the motor 23 between normal rotation / reverse rotation, it is possible to perform an up / down operation.

The window regulator driving device described in detail below can be used for various window regulators other than the wire type shown here, for example, arm type.

Next, the principle structure and operation of the window regulator driving device of the present invention will be described with reference to FIG. B is a battery that constitutes a power supply means for generating a constant DC voltage. The polarity changeover switch 1 is an operation switch for inputting an instruction to move up / down the window glass, and constitutes a switching means for switching the voltage polarity from the battery B according to the input in accordance with the rotation direction of the motor. . The polarity changeover switch 1 is one in which the contacts are directly switched by a manual operation, and one in which the operation unit and the actual polarity changeover switching unit are separated (a relay and a switching element are separate from the operation unit. Any of the means used) may be used.

The voltage control unit 2 changes the output voltage in at least one of the polarities according to the polarity of the voltage switched by the polarity changeover switch 1 and supplies the motor 23 with a voltage lower than that at the time of rising when the window glass descends. It constitutes a voltage control means. In FIG. 1, a voltage control unit 2 including a parallel circuit of a diode D that is a rectifying means and a resistor R that is a voltage dividing resistance means is shown. Incidentally, as the rectifying means, a selenium rectifier or the like can be used in addition to the silicon diode and the germanium diode.

In FIG. 1, when the polarity changeover switch 1 is in the state shown by the solid line on the a side, a positive voltage is applied from the battery B to the motor terminal 23a side and a negative voltage is applied to the terminal 23b side. For example, the motor 23 with this polarity
The window glass 22 is set to be raised by the rotation of.

In the case of this polarity, since the current flows in the forward direction of the diode D in the voltage control unit 2, the resistance value is extremely low and the voltage drop is extremely small. For example, when a silicon diode is used, it is about 0.6V, and when a germanium diode is used, it is about 0.1V. Therefore, when the rated voltage of the battery B is 12V, the motor 23 has 11.4V or 11.9V.
A voltage very close to the rated voltage such as V will be applied. Therefore, when the window glass 22 is raised, the same rising speed as in the conventional case can be obtained with almost no influence of the voltage control unit 2.

On the other hand, when the polarity changeover switch 1 is in the state shown by the broken line on the b side, a negative voltage is applied from the battery B to the terminal 23a side of the motor and a positive voltage is applied to the terminal 23b side of the motor. The window glass 22 is lowered by the rotation of the motor 23 at that time.

In the case of this polarity, the diode D in the voltage control unit 2 is biased in the reverse direction and is therefore in the cut-off state, which can be regarded as an almost infinite resistance value. Therefore, the current flows through the motor R through the resistor R. At this time, the voltage of the battery B is VB and the resistance value of the resistor R is R
When r and the internal resistance value of the motor 23 are Rm, the voltage drop Ed generated in the voltage control unit 2 is Ed = (Rr / (Rr
+ Rm)) VB. Therefore, the motor 23 has VB
-Ed = (Rm / (Rr + Rm)) VB is applied. Therefore, by adjusting the resistance value Rr of the resistor R, the rotation speed and torque of the motor 23 can be adjusted, and as a result, the descending speed of the window glass 22 can be adjusted to be slow. become. In this case, it becomes possible to reduce the descending speed accelerated due to the weight of the window glass, and it becomes possible to adjust in a direction to eliminate the speed difference between the ascending and descending. Also, by adjustment,
It is also possible to select an arbitrary descending speed.

As a result, the stopper 26a becomes the window glass 22.
It is possible to suppress the generation of shock and noise when the holder 26 comes into contact with the holder 26 when it descends. Further, since the motor torque at the time of restraining the window glass 22 to the lowermost position (at the time of restraining the bottom dead center) can be reduced, the load on the wire 33 and the gears 34, 35 is also reduced.

In this case, as compared with the conventional window regulator driving device including the motor and the polarity changeover switch, only the voltage control unit 2 for the diode and the resistor is newly provided, so that the structure is simple. Yes, and reliable enough.

As described above, the output voltage is changed in at least one of the polarities according to the polarity of the voltage switched by the polarity selector switch 1 to supply the motor 23 with a lower voltage when the window glass is descending than when it is rising. By providing the voltage control unit 2, it becomes possible to reduce the descending speed accelerated due to the weight of the window glass, and it is possible to eliminate or adjust the speed difference between the ascending and descending speeds. A regulator drive device can be realized.

FIG. 3 is a block diagram showing the configuration of another example of the embodiment of the present invention. Here, a series circuit of a diode D1 and a resistor R1, and a diode D2 and a resistor R2 in opposite directions are provided.
The voltage control unit 2 is configured in a state in which two circuits including a series circuit of 2 and 2 are connected in parallel.

In FIG. 3, when the polarity changeover switch 1 is in the state shown by the solid line on the a side, a positive voltage is applied from the battery B to the terminal 23a side of the motor and a negative voltage is applied to the terminal 23b side. For example, the motor 23 with this polarity
The window glass 22 is set to be raised by the rotation of.

In the case of this polarity, since the current flows in the forward direction of the diode D1 in the voltage control unit 2, the resistance value is extremely low and the voltage drop in the diode D1 is extremely small. On the contrary, the diode D2 is cut off by the reverse bias and the resistance value is extremely large.

Therefore, the voltage applied to the motor 23 at the time of rising decreases by the amount of the voltage drop caused by the resistor R1 connected in series with the diode D1. On the other hand, when the polarity switch 1 is in the state shown by the broken line on the b side,
From the battery B, the negative terminal 23a of the motor, the terminal 23
A positive voltage is applied to the b side, and the window glass 22 descends due to the rotation of the motor 23 in this polarity.

Since a current flows in the forward direction of the diode D2 in the voltage control unit 2, the resistance value is extremely low and the voltage drop in the diode D2 is extremely small. On the contrary, the diode D1 is cut off by the reverse bias and the resistance value is extremely large.

Therefore, the voltage applied to the motor 23 at the time of rising decreases by the amount of the voltage drop caused by the resistor R2 connected in series with the diode D2. In the above case, by adjusting the resistance values of the resistors R1 and R2, it becomes possible to freely and independently select the rising speed and the falling speed. Generally, by setting the resistance value of the resistor R2 to be larger than the resistance value of R1, it becomes possible to adjust the descending speed of the window glass 22 as a result.

In this case, the descending speed accelerated due to the weight of the window glass can be reduced, and the speed difference between the ascending and descending can be adjusted so as to be eliminated. It is also possible to select an arbitrary descending speed by adjustment.

As a result, the stopper 26a becomes the window glass 22.
It is possible to suppress the generation of shock and noise when the holder 26 comes into contact with the holder 26 when it descends. Further, since the motor torque at the time of restraining the window glass 22 to the lowermost position (at the time of restraining the bottom dead center) can be reduced, the load on the wire 33 and the gears 34, 35 is also reduced.

In this case, as compared with the conventional window regulator driving device including the motor and the polarity changeover switch, only the voltage control unit 2 for the diode and the resistor is newly provided, so that the structure is simple. Yes, and reliable enough.

As described above, two types of output voltages having different values are generated according to the polarity of the voltage switched by the polarity switch 1, and when the window glass is descending, a lower voltage than when it is rising is supplied to the motor. By providing the voltage control unit 2, it becomes possible to reduce the descending speed accelerated due to the weight of the window glass, and it is possible to eliminate or adjust the speed difference between the ascending and descending speeds. A regulator drive device can be realized.

FIG. 4 is a block diagram showing the configuration of still another example of the embodiment of the present invention. Here, instead of the series circuit of the diode and the resistor described above, a configuration example of the voltage control unit 2 ′ configured by a series power supply is shown.

Here, the voltage control unit 2'includes a transistor TR1 composed of an NPN transistor and bias resistors R11 and R12, and a first series power source (series-pass type power source) which acts in an ascending direction and a PNP. A second series power supply (series-pass type power supply) that is composed of a transistor TR2 composed of transistors and bias resistors R21 and R22 and that operates in the downward direction, and two series power supplies that operate in opposite directions. Are connected in parallel.

Here, when the polarity selector switch 1 is switched to the polarity side of the rising voltage, the resistors R11 and R
The bias voltage of the transistor TR1 (+
0.6V) is determined, and the transistor TR
Output voltage of 1 (voltage applied to the motor 23 when rising)
Is determined. The transistor TR1 that constitutes the first series power supply stops its operation when the voltage at the time of falling is applied by the switching of the polarity changeover switch 1, because the polarity of the bias voltage is inverted.

On the other hand, when the polarity changeover switch 1 is switched to the polarity side of the voltage for lowering, the resistors R21 and R22 are
The bias voltage of the transistor TR2 (-
0.6V) is determined, and the transistor TR
2 output voltage (voltage applied to the motor 23 when falling)
Is determined. The transistor TR2 constituting the second series power supply stops its operation when the rising voltage is applied by the switching of the polarity changeover switch 1 because the polarity of the bias voltage is inverted.

Therefore, the ratio of the resistances R11 and R12 and the resistance R
By adjusting the ratio of 21 and R22, it becomes possible to freely and independently select the rising speed and the falling speed. Generally, by setting the voltage generated on the transistor TR2 side to be lower than the voltage generated on TR1, it becomes possible to adjust the descending speed of the window glass 22 as a result.

In this case, the descending speed accelerated due to the weight of the window glass can be reduced, and the speed difference between the ascending and descending can be adjusted to be eliminated. Further, it is also possible to select any ascending speed and descending speed by adjustment.

As a result, the stopper 26a becomes the window glass 22.
It is possible to suppress the generation of shock and noise when the holder 26 comes into contact with the holder 26 when it descends. Further, since the motor torque at the time of restraining the window glass 22 to the lowermost position (at the time of restraining the bottom dead center) can be reduced, the load on the wire 33 and the gears 34, 35 is also reduced.

In this case, as compared with the conventional window regulator driving device including the motor and the polarity changeover switch, only the voltage control unit 2 having the series power source is newly provided, so that the structure is simple. , Reliability is also sufficient. Further, it is also possible to use an element such as a three-terminal regulator for this series power supply portion.

As described above, two kinds of constant voltages having different values are generated according to the polarity of the voltage switched by the polarity switch 1, and when the window glass descends, a constant voltage lower than that when the window glass rises is supplied to the motor. By providing the voltage control unit 2 for controlling, it becomes possible to reduce the descending speed accelerated due to the weight of the window glass, and it is possible to eliminate or adjust the speed difference between the ascending and descending. A window regulator drive can be realized.

In the case of FIG. 4, the description has been made assuming that there are two series power supplies that operate in opposite directions in the voltage control unit. However, in addition to this series power supply, a chopper using a thyristor or the like, A switching power supply, a DC-DC converter, etc. can be used.

That is, as shown in FIG. 5, the first and second voltage control units 2a and 2b are configured to generate different voltages according to the polarities of the voltages, and when the window glass is descending, it is more than when it is rising. By supplying a low constant voltage to the motor, it becomes possible to reduce the descending speed accelerated due to the weight of the window glass, and it is possible to eliminate or adjust the speed difference between the ascending and descending. A window regulator drive can be realized.

In this case, the first and second voltage control units 2
Even if a and 2b are not of the same type, it is possible to combine various power supplies and the above-mentioned series circuit of a diode and a resistor.

[0060]

As described above in detail, in the invention described in claim 1, when the switching means inputs an instruction to raise / lower the window glass, the voltage polarity from the power supply means is changed in response to the input. Switching according to the direction of rotation of the motor, the voltage control means changes the output voltage in at least one of the polarities according to the polarity of the switched voltage so that a voltage lower than that at the time of rising when the window glass descends is applied to the motor. Supply. As a result, it becomes possible to reduce the descending speed accelerated due to the weight of the window glass, and it is possible to realize a window regulator drive device capable of eliminating or adjusting the speed difference between the ascending and descending speeds.

According to the second aspect of the present invention, when an instruction to raise / lower the window glass is input to the switching means,
The voltage polarity from the power supply means is switched according to the input in accordance with the rotation direction of the motor, and the voltage control means generates two kinds of output voltages having different values according to the polarity of the switched voltage, and the window When the glass descends, a lower voltage is supplied to the motor than when it rises. As a result, it becomes possible to reduce the descending speed accelerated due to the weight of the window glass, and it is possible to realize a window regulator drive device capable of eliminating or adjusting the speed difference between the ascending and descending speeds.

According to the third aspect of the invention, when an instruction for raising / lowering the window glass is input to the switching means,
In response to this input, the voltage polarity from the power supply means is switched according to the rotation direction of the motor, and the voltage control means changes the output voltage according to the polarity of the voltage thus switched. Supply a lower voltage to the motor. At this time, in the voltage control means composed of the rectifying means and the voltage dividing resistance means, a current flows in the forward direction through the rectifying means when the window glass rises, so that the voltage drop is small. On the other hand, when the voltage drops, the rectifying means reverses and is cut off, and a voltage drop occurs in the voltage dividing resistance means. As a result, a voltage lower than that at the time of rising is supplied to the motor at the time of falling. As a result, it becomes possible to reduce the descending speed accelerated due to the weight of the window glass, and it is possible to realize a window regulator drive device capable of eliminating or adjusting the speed difference between the ascending and descending speeds.

According to the fourth aspect of the invention, when an instruction for raising / lowering the window glass is input to the switching means, the voltage polarity from the power source means is switched according to the input in accordance with the rotation direction of the motor. The constant voltage source of the voltage control means generates a constant voltage lower than that at the time of raising the window glass and supplies it to the motor according to the polarity of the voltage thus switched. As a result, it becomes possible to reduce the descending speed accelerated due to the weight of the window glass, and it is possible to realize a window regulator drive device capable of eliminating or adjusting the speed difference between the ascending and descending speeds.

Further, as a result of adjusting the ascending and descending speeds according to the invention described in each claim, it is possible to suppress the generation of shock and noise when the window glass reaches the lowermost position than before. become able to. Furthermore, since the motor torque at the time of restraint when the window glass is lowered to the lowest position can be reduced, the load on each part such as the wire and gear is also reduced.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an example of an embodiment having a principle configuration of a window regulator drive device of the present invention.

FIG. 2 is a configuration diagram for explaining a mechanism of a window regulator.

FIG. 3 is a configuration diagram showing another configuration of the window regulator drive device according to the embodiment of the present invention.

FIG. 4 is a configuration diagram showing still another configuration of the embodiment of the window regulator drive device of the present invention.

FIG. 5 is a configuration diagram showing another configuration of the embodiment of the window regulator drive device of the present invention.

[Explanation of symbols]

 B Battery (Power Supply Means) 1 Polarity Switch (Switching Means) 2 Voltage Control Unit (Voltage Control Means) D Diode (Rectifying Means) R Resistance (Voltage Dividing Means) 23 Motor

Claims (4)

[Claims] 1. A window regulator drive device for supplying a motor drive voltage to a window regulator that raises / lowers a window glass by using a rotational force of a motor, wherein an instruction for raising / lowering the window glass is input. Depending on this input, the switching means for switching the voltage polarity from the power supply means according to the rotation direction of the motor and the polarity of the voltage switched by the switching means change the output voltage in at least one polarity. A window regulator driving device comprising: a voltage control unit that supplies a lower voltage to the motor when the window glass is descending than when it is rising. 2. A window regulator drive device for supplying a motor drive voltage to a window regulator which raises / lowers a window glass by utilizing a rotational force of a motor, wherein an instruction for raising / lowering the window glass is input. Then, in accordance with this input, switching means for switching the voltage polarity from the power supply means in accordance with the rotation direction of the motor, and two types of output voltages having different values depending on the polarity of the voltage switched by the switching means, A window regulator driving device comprising: a voltage control unit that supplies a lower voltage to the motor when the window glass is descending than when it is rising. 3. A window regulator drive device for supplying a motor drive voltage to a window regulator which raises / lowers a window glass by utilizing a rotational force of a motor, wherein an instruction for raising / lowering the window glass is input. The switching means switches the voltage polarity from the power supply means according to this input according to the rotation direction of the motor, and the output voltage is changed according to the polarity of the voltage switched by the switching means, and rises when the window glass descends. A window regulator driving device comprising: a voltage control unit configured by a rectifying unit and a voltage dividing resistor unit to supply a voltage lower than the time to the motor. 4. A window regulator drive device that supplies a motor drive voltage to a window regulator that raises / lowers a window glass by using a rotational force of a motor, wherein an instruction for raising / lowering the window glass is input. The switching means switches the voltage polarity from the power supply means according to this input according to the rotation direction of the motor, and the output voltage is changed according to the polarity of the voltage switched by the switching means, and rises when the window glass descends. And a voltage control unit configured of a constant voltage source that generates different constant voltages according to the polarities of the voltages to supply a voltage lower than the time, to the motor.