JPH03200440A - Control method for motor of power seat and device thereof - Google Patents

Abstract

PURPOSE:To quickly move a seat to its optimum seating posture by driving motors at a fixed high speed at automatic control, and at manual control driving the motors at high speed and after passing a prescribed time controlling to drive the motors at low speed. CONSTITUTION:The motor control device 10 for a power seat is provided with a manual switch 12, a memory switch 14, and a CPU 16, and controls a seat position in the front and rear direction and inclination of a seat back by operation of a motor M1 for sliding and a motor M2 for reclining. In this case the motor control device 10 is provided with voltage supply lines 68, 70 between a battery 66 and motors M (M1, M2) in parallel with each other, a low voltage power source 18 is provided on one line 68, and the contact point 72a of a voltage control relay 72 is provided on the other line 70. At manual control, the motors M are driven at high speed, and after passing a prescribed time, the relay 72 is controlled so that the applied voltage on respective motors M are changed over to low voltage to drive the motors M at low speed.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention operates a seating posture control device by controlling the drive of a motor, and adjusts the longitudinal position, vertical position, inclination angle, headrest, etc. of the seat. The present invention relates to a motor control method and a motor control device for a power seat in which the support position by a side support device or the like can be adjusted.

[Conventional technology]

For example, in vehicles, seats called power seats are equipped with various seating posture control devices such as seat slide devices, seat lifter reclining devices, movable headrests, side support devices, etc. that can be moved by motor drive control. is well known.

Such power seats are widely used, for example, for driver sorting, and the driver operates an appropriate seating position control device to adjust the movable parts according to the driver's body shape, preferences, driving conditions, degree of fatigue, etc. It is configured so that the position can be adjusted and a good sitting posture can be set arbitrarily.

In such a power seat, a configuration is known in which, for example, a configuration is provided with a memory function that allows a microcomputer or the like to memorize the optimal position of a movable member of a seating posture control device adjusted by driving a motor. In such a configuration, for example, if memory is regenerated at any position control of the movable member, the movable member of the seating posture control device will automatically move from the arbitrary position to the memory position, and the memory position will be repeated again. Set. Therefore, one's optimal sitting posture can be easily set without performing any troublesome operations.

Furthermore, the positions of each movable member can be adjusted arbitrarily by a manual switch provided individually for each seating posture control device, and the position of the movable member can be adjusted as appropriate.

[Problem to be solved by the invention]

Here, a movable member of a seating posture control device, such as a seat in a seat slide device, which has a long travel distance during memory playback, is operated by a motor so that it can be moved at foot speed from an arbitrary position control to a memory position. The rotation speed of is set to a relatively high speed.

In other words, the motor is driven at high speed both during memory playback and when the manual switch is operated, and the movable member of the seating posture control device is moved at high speed also when the manual switch is operated.

However, even if the speed is appropriate during memory playback, the rotational speed during manual switch operation is too fast. Therefore, a decrease in the accuracy of stopping the movable member is inevitable, and it is difficult to stop the movable member at a position desired by the seated person, and it is difficult to finely adjust the position control of the movable member.

1: From the point mentioned above, it is conceivable to rotate the motor at two different speeds so that the moving speed of the movable member suitable for each of memory playback and manual switch operation can be obtained, for example.

In such cases, a configuration is often used in which the rotational speed of the motor is switched by switching the voltage applied to the motor between a high voltage and a low voltage.

However, if the voltage applied to the motor is set to a low voltage because the motor rotates at a low speed, the torque of the motor decreases in proportion to the applied voltage, and the torque during steady driving cannot be obtained during low speed driving.

Here, since the friction coefficient of the movable member of the seating posture control device when it starts moving is about several to ten times the friction coefficient during steady movement, the starting torque corresponding to this is Required for motors. However, during low voltage driving, the torque during steady driving cannot be obtained, and the motor starts the movable member with low torque, so there is a risk that the motor itself will not start.

The present invention provides a motor control method and motor control method for a power seat that enables fine adjustment of the position of the movable member by increasing the motor speed to two speeds while maintaining the torque necessary for moving the movable member of the seating posture control device. The purpose is to provide bag d.

[Means to solve the problem]

In order to achieve this object, in the power seat motor control method of the present invention, the friction coefficient during steady movement of the movable member is usually 1, and is a fraction of the friction coefficient at the start of movement.
We are focusing on the fact that it will be about 1/10th. In other words, according to the present invention, during manual control, the motor is started at high speed by the voltage supplied from the power supply, and after a predetermined time has elapsed from the start, the voltage applied to the motor is switched to a low voltage, and the motor is is driven at low speed.

Further, during automatic control, the motor is always driven at a constant high speed rotation by the voltage supplied from the power source.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

As shown in FIGS. 1 and 2, the power seat motor control system according to the present invention is equipped with ff1101;! , v = user switch 12, memory switch 14, central processing unit 16, and low voltage power supply 18.

Further, the motor control device 10 further includes, for example, a sliding motor M1, a reclining motor H2,
By driving each motor, the seat (Dryno (- seat)
The front and back positions of the seatback 20 and the inclination angle (reclining angle) of the seatback 22 can be controlled.

The motor Ml, 82 is provided as a driving source for each of the seating posture control devices, for example, the seat slide device 24 and the reclining device 26. These motors M
As l 82 , a DC geared motor is usually available.

For example, the seat slide device 24 is disposed between the seat cushion 28 of the seat 20 and the vehicle floor 29, and is driven by the slide motor H1 to move, for example, in the front-back direction (slide) using the seat itself as a movable member. The seat 20 is normally set at a seating position (drive position) as shown by the solid line in FIG. A seated person (driver) can get on and off the vehicle without being obstructed (riding position), and a seated person can get on and off the vehicle at the ride position.

Further, the reclining device 26 is operated by the seat back 2 which is a movable member by the drive of the reclining motor H2.
The inclination angle (reclining angle) of 2 can be adjusted.

In addition, the seat slide device 24 and the reclining device 2
The motors 81 and 82 are, for example, the position detecting means 3.
032, respectively. For example, as shown in FIG. 1, the position detection means 30 and 32 include a disk-shaped permanent magnet 34 fixed to an output shaft (not shown) of a motor, and a permanent magnet 34 provided adjacent to the side of the permanent magnet. A rotation sensor configured with a reed switch notch 36 can be used. In such a configuration, permanent magnet 34 is connected to motor 81 . The polarity of a permanent magnet that rotates integrally with each output shaft of M2 and passes by the side of the corresponding reed switch 36 opens and closes the reed switch contacts, and when the contacts are closed, a pulse is generated. .

Here, it is preferable that the rotation sensor (position detecting means) 3032 is formed with a permanent magnet 34 so as to generate a plurality of pulses per rotation of the output shaft of the corresponding motor 81 or M2, for example. According to such a configuration, motor M1. The drive of M2 can be subdivided and detected.

As shown in FIG. 1, the reed switches 34 of the rotation sensors 30, 32 are each connected to the central processing unit 16, for example, and as described later, pulses generated by driving the motor HIM2 are output to the central processing unit. ,
The number of pulses is counted and stored in the memory of the central processing unit. Then, the number of rotations of the motor H1H2, that is, the longitudinal position of the seat 20 and the reclining angle of the seat back 22 are detected based on the counts of the rotation sensors 30 and 32. For example, the pulse count increases when the motor Ml 82 rotates in the normal direction, and counts down when the motor Ml 82 rotates in the reverse direction.

The motor Ml 82 is, for example, a manual switch 1
The respective drives are controlled by the operations in step 2.

As shown in FIG. 1, the manual switch 12 includes a slide switch 38 and a reclining switch 40. As shown in FIG. 2, the manual switch 12 is provided at a position that can be operated by the driver, for example, on the side of the seat cushion 27.

As shown in FIG. 1, the switch 3840 of the manual switch 12 is, for example, an automatic return type seesaw switch that has a neutral position and two-position contacts and can switch the rotational direction of the motors M1M2 depending on the operating direction. Available. The switch 3840 of the manual switch 12 is connected to the central processing unit 1
6, respectively.

For example, manual switch slide switch 3
8 is operated, a predetermined signal is sent to the central processing unit 16.
The driver controls the slide motor H1 to move the seat 20 in the front and back directions, and arbitrarily sets the seat position according to the driver's body shape and preferences.

The central processing unit 16 is formed with a microcomputer (microcomputer) 42, and the microcomputer is configured to process input according to a stored program and to generate appropriate control signals. As can be seen from FIGS. 1 and 2, the control signal is, for example, relay control circuit 44.
LLI is input to motor control relay 4, and the relay control circuit is connected to motor control relay 4.
Activate the appropriate relay among 6 to 49. Then, the energized relays among the motor control relays 46 to 49 switch the corresponding relay contacts 46a to 49a, respectively, thereby controlling the drive (rotation) direction of the motor MI H2.

For example, when the sliding switch 38 of the manual switch is operated at any seat position, a corresponding signal is output to the central processing unit, Y and T.

Then, the control signal processed by the central processing unit 16 is output to the relay control circuit 44, and the signal from the relay control circuit 6 energizes, for example, the motor control relay 116, 47, which activates the corresponding relay. Contact 4Ga,
47a is switched. And relay contacts 46a, 4
By switching 7a, the slide motor M1 is driven in the corresponding direction, and the seat 20 is moved in the front and back direction.
The front and rear positions of the seat are adjusted.

The manual switch sliding switch 38 is normally operated, for example, when making fine adjustments to the front and back placement of the seat 20 in the drive position.

Further, when the reclining switch 40 of the manual switch is operated at any angle of the seat back 22, a corresponding signal is output to the central processing unit 16. Then, a signal from the central processing unit 16 is sent to the relay control circuit 44, and the signal from the relay control circuit energizes, for example, the motor control relay 4849, and the corresponding relay contacts 48a, 49a are switched. By switching the relay contacts 48a to 49a, the reclining motor H2 is driven in the corresponding direction, and the seat pack 22 is swung back and forth.

The reclining switch 40, which is a manual switch, is normally operated when finely adjusting the reclining angle of the seat pack 22.

The arbitrarily adjusted longitudinal position of the seat 20 and the reclining angle of the seat back 22 can be stored and reproduced by operating the memory switch 14. As shown in FIG.
For example, it is formed with a switch 52 for storing an arbitrarily set drive position, and a regeneration switch 5456 for automatically returning to the stored drive position (memory position). There is. memory switch set switch 52;
As the regeneration switch 5456, for example, an automatic return type switch can be used, and each switch is connected to the central processing unit 16, respectively.

For example, when the set switch notch 52 of the memory switch is operated in the drive position of the seat 20 that has been arbitrarily adjusted by operating the manual switch 12, the rotation sensors 30 and 32 of each motor detect the signal from the set switch. The counted number is stored in the memory of the central processing unit 16. In other words, the motor 81. , M2, the longitudinal position of the seat 20 and the reclining angle of the seat cover 22 are stored in the central processing unit 16 by operating the set switch 52 of the memory switch.

For example, when the regeneration switch 54 of the memory switch is operated at an arbitrary position of the seat 20, the current position of the motor M1 82 is first recognized by the counts of the rotation sensors 30 and 32. Then, in the memory of the central processing unit 16, the motor M
The count number (measured value) at the current position of 82 is compared with the count number (memory value) at the memory position, and if there is a match, the central processing unit 16 sends the corresponding relay control circuit 44 to the relay control circuit 44. A motor drive signal is output. The relay control circuit 44 is connected to the central processing unit 16
energizes a suitable relay among the relays 46 to 49, and by switching the corresponding relay contacts 46a to 49a, the motors 81 and 82 move in the corresponding direction until the measured value and the memory value match. driven, seat 20
is returned to the memory position.

In addition, in this embodiment, a regeneration switch 56 is provided in addition to the regeneration switch 54, and the re/4E switch 5
It is configured such that a memory position different from the memory position in 4 can be stored and reproduced.

When the playback switch 56 is operated, the operation is similar to that described above, and the sheet 20 is automatically returned to the memory position of another pattern.

Although not shown in the embodiment, the sheet 2
It is preferable that the memory switch 14 is provided with a ride switch for moving 0 to the ride position.

As shown in FIG. 2, the memory switch 14 is provided, for example, similarly to the manual switch 12, on the side of the seat cushion 27 or the like, at a location where the driver's operation port can be accessed. The manual switch 12 and memory switch 14 may be placed in any position where they can be operated by the driver, and are not limited to the side of the seat cushion 27. For example, the manual switch 12 and memory switch 14 may be placed in a position such as the armrest of a corresponding door, a console box, an instrument panel, etc. may be provided.

Here, the motor control device 10 of the present invention includes, for example,
A handbrake detection means 60 for detecting the locked state of the handbrake 58 is provided.

The handbrake detection means 60, as shown in FIG.
For example, when a handbrake detection means provided in the handbrake 58 is turned on, a locked state of the handbrake, that is, a stopped state of the vehicle is detected.

As the handbrake detection means 60, for example, an automatic return type pushbutton switch can be used, and the handbrake detection means is connected to the central processing unit 16 as shown in FIGS. 1 and 2.

For example, when the handbrake detection means 60 detects the locked state of the handbrake 58, a signal is output to the central processing unit 16, and the stoppage of the vehicle is detected, and the seat 20 can only be moved when the vehicle is stopped. It is configured so that Therefore, the handbrake 58
In the unrotated state, in other words, even if the manual switch 12, memory switch 14, etc. are operated by mistake while the vehicle is running, the seat will not be moved, which will prevent the driver's seating posture from collapsing while the vehicle is running, thereby increasing safety. Can be secured.

The motor control device 10 also includes overcurrent detection resistors 62 and 64 that detect overcurrent flowing to the motor Ml, 82. Overcurrent occurs, for example, when motors $41 and H2 are overloaded, and when the central processing unit 16 detects the overcurrent to each motor via the 'A current detection resistors 62 and 64, the The signal stops each motor. That is, for example, motor Ml 82
When the motor becomes overloaded due to mechanical blockage (mechanical blockage) or the like and an overcurrent occurs, the motor is immediately stopped, so that overheating and damage to each motor can be reliably prevented.

Furthermore, as can be seen from Figures 1 and 2, the motor M
1, 82, together with the central processing unit 16 and the relay control circuit 44, are connected to an automobile battery 66 serving as a power source, and are driven by the voltage supplied from the battery.

By the way, for example, the coefficient of friction of the slide rail (not shown) during steady movement of the seat 20 of the seat slide device 24 is a fraction of the coefficient of friction at the start of movement. Experimental data has shown that it decreases to about 1. Conversely, the motor drive torque required to move the seat 20 during steady movement is 1/1 to 1/10 N degrees of the starting torque.
The sheet can be moved in 1-minute.

Therefore, by focusing on the above experimental data, according to the present invention, when operating the manual switch 12, when manually controlling the motor Ml, 82, the seat 20
, motor 81 .
) 12 is driven at low speed rotation under low voltage.

For example, as can be seen from FIGS. 1 and 2, according to the motor control device 10 of the present invention, the battery 66,
Voltage supply paths 6870 between the motors Ml, 82 are formed in parallel, for example one path 68 is provided with a low voltage power supply 18 that reduces the supply voltage from the battery. The low voltage power supply 18 lowers the voltage supplied from the battery 66 to a predetermined low voltage below the rated voltage of the motor H1H2, for example, to a voltage at which the low-speed driving torque of the motor is approximately a fraction of the steady torque. Each motor is configured to be able to rotate at low speed.

Further, a relay contact 72a of a voltage control relay 72 is provided on the other path 70, and the voltage control relay is connected to the relay control circuit 44. Relay contact 72a is normally closed, making path 70 a closed circuit.

The relay control circuit 44 is configured to energize the voltage control relay 72 in response to a predetermined signal from the central processing unit 16, and when the voltage control relay is energized, the corresponding relay contact 72a is activated. Open, route 7
0 is an open circuit.

In this invention, during manual control, the motor M11M is operated under the supply voltage from the battery 66.
2 with high speed rotation, seat 20, gidopa, ri 22
After the motor reaches steady movement, the voltage applied to each motor is switched to a low voltage, and each motor is driven at a low speed. Here, seat 20, seat back 2? Since the steady movement of the motor 8182 can be determined based on, for example, the time since the start of the motor 8182, the voltage applied to the motor is switched after a predetermined period of time has elapsed since the start of the motor. For example, since it takes about 0.5 degrees from motor startup for the friction coefficient of the slide rail of the seat slide device 24 to reach the friction coefficient during steady movement, the predetermined time at motor startup is set with a margin of, for example, 50%. The time is approximately 0.75 seconds.

For example, as shown in Figure 1, manual switch 1
2, the corresponding predetermined signal is sent to the central processing unit 1.
6, first, the motor control relays 46 to 49
The corresponding relay among them is energized, and the relay contact 46a~
49a to switch the corresponding relay contact to connect the motor M1. Drive M2. Also, manual switch 1
When the signal from 2 is detected by the central processing unit 16, a timer (not shown) of the central processing unit is reset and the timer starts counting.

At this time, since the relay contact 72a is closed and the path 70 is closed, the supply voltage from the battery 66 is applied to the motors 81 and 82 via the path 70. Therefore, as you can see from Figure 3, the battery 6
The rated voltage from 6 is applied to the motors Ml, 82, and each motor is started under the rated voltage.

When a predetermined period of time has elapsed since the motors 81 and 82 were started and the timer is turned off, a signal is output from the central processing unit 16 to the relay control circuit 44, the voltage control relay 72 is energized, and the relay contact 72a opens. Path 70 then becomes open circuit, and low voltage ? A low voltage supplied from the lH source 18 is applied to the motors 141, 82, causing the motors to rotate at a low speed and move the seat back 22 at a low speed.

The seat 20 or seat back 22 moves and
When the manual switch 12 is released, the corresponding relay among the motor control relays 46 to 49 is activated by a signal from the relay control circuit 44, and the corresponding relay among the relay contacts 46a to 49a is activated. Contacts can be switched. Then, the motor Ml 82 is stopped, and the seat 20 or the seat back 22 is stopped from moving at a low speed at an arbitrary position.

Further, when the regeneration switch 54 or 56 of the memory switch is operated, the relay contact 72a is always closed. As shown in FIG. 4, the supply voltage from the battery 66, that is, the rated voltage, is constantly applied to the motor Ml 82. Therefore, the motors 81 and 82 rotate at high speed (steady drive) under the rated voltage, and the seat 20
, move the JidoPac 22 to the memory position at high speed.

As described above, according to the power seat motor control method of the present invention, during manual control, the motor Ml, 82 is started at high speed rotation by the voltage supplied from the battery 66, and after a predetermined period of time has elapsed from the start. , the voltage applied to the motor is switched to a low voltage and the motor is driven at low speed. In addition, in the auto control special program, the motor is always driven at a constant high speed rotation by the voltage supplied from the power source.

In other words, even during manual control, the motor 81 M
2 is started from steady drive under the rated voltage from the battery 66, so it is reliably started without being hindered by the coefficient of friction at the time the seat 20 and seat back 22 start moving. Therefore, it is possible to switch between high speed rotation and low speed rotation of the motors H1H2, and each motor is driven at low speed rotation under manual control, and each motor is driven at high speed rotation under automatic control.

Therefore, the seat 20 and seat back 2 are automatically controlled.
2, the seat can be quickly moved to the memory position and the right position, allowing the driver to get in and out of the car quickly (b), and also move the seat in the drive position and seat back position 3. Fine adjustments can be made easily.

During manual control, the seat 20 and seat back 22 are stopped from moving at low speed, so
The inertial force when stopping the seat, steering wheel, and steering wheel is suppressed, and the stopping accuracy is improved to 1 minute.

Furthermore, if the rotational speed of the motors 81 and 82 during high-speed movement of the seat 20 and the seatback 22 is a steady rotational speed under the rated applied voltage, then during high-speed rotation, each motor has a battery 66 It is sufficient to simply apply the supply voltage from the seat 20 and the seat back 22 without complicating the configuration.

And, the power seat motor control device 10 of the present invention
According to the above method, the motor control method described above can be carried out appropriately and the motor can be driven at a low rotation speed, so that the motor can be driven at two speeds in 1 minute.

In the embodiment, a power seat equipped with a seat sliding device 24 and a reclining device 26 is shown as an example.
However, the present invention is not limited thereto, and can also be applied to a power seat equipped with other seating posture control devices, such as a seat lifter, a movable seat belt, a seat belt, a seat support device, and a side support device.

Although the seat 20 is illustrated as a driver's seat in the embodiment, it is not limited thereto, and may be applied to an unstand seat, for example.

In addition, in the embodiment, the seat 20, the seat back 22
The positive controller is detected and recognized by the rotational speed of the motors 81 and 82. However, the positions of the seat 20 and seat back 22 are detected at any time, and the central processing unit 1G
It is not limited to this, as long as it can be recognized and memorized. For example, a configuration may be adopted in which the positive controls of the seat 20 and the seat back 22 are directly detected using a photoelectric position sensor or the like, and the position of the movable member is recognized and stored from the data of the position sensor.

In the embodiment, the present invention is embodied as a motor control device for a power seat for an automobile.

However, any seat that can adjust the position of the movable member of the seating posture control device through motor drive control is sufficient, and is not limited to power seats for automobiles.For example, seats for trains, airplanes, ships, etc. It can also be applied to sheets for , FJ hair, etc.

The above-mentioned embodiments are for illustrating the present invention, and are not intended to limit the present invention in any way, and any modifications, modifications, etc. made within the technical scope of the present invention are also included in the present invention. Needless to say.

〔Effect of the invention〕

As described above, according to the power seat motor control method according to the present invention, during manual control, the motor is started at high speed rotation by the voltage supplied from the power source,
After a predetermined period of time has elapsed since starting, the voltage applied to the motor is switched to a low voltage, and the motor is driven at low speed. Further, during automatic control, the motor is always driven at a constant high speed rotation by the voltage supplied from the power source. Therefore, it is possible to switch between high-speed rotation and low-speed rotation of the motor, and each motor is driven at low speed in manual control, and each motor is driven at high speed in automatic control.

Therefore, when the movable members of the seating posture control device are moved by automatic control, the seat can be quickly moved to the memory position controller, etc., and the seated person can quickly get on and off the vehicle, and the seat can be moved in the seating position. Fine adjustment of the positive control of members can be easily performed.

Then, during manual control, the movable member of the seating posture control device is stopped from a state of low-speed movement, so the inertia force when the movable member is stopped is suppressed, and the stopping accuracy is improved to 1 minute.

Furthermore, if the rotational speed of the motor during high-speed movement of the movable member of the seating posture control device is the steady rotational speed under the rated applied voltage, then during high-speed rotation, the voltage supplied to each motor from the power supply It is sufficient to apply as is. Therefore, the movable member of the seating posture control device can be moved quickly without complicating the configuration.

According to the power seat motor control device of the present invention, the above-mentioned motor control method can be carried out appropriately, and the motor can be driven at low speed, so that the motor can be driven at two speeds in 1 minute. It can be measured.

[Brief explanation of drawings]

FIG. 1 is a block diagram centered on the central processing unit of a power seat motor control device according to the present invention, FIG. 2 is a schematic block diagram of the motor control device, FIG.
FIG. 4 is a characteristic diagram of the voltage applied to the motor during manual control and automatic control using the motor control method of the present invention. 10: Power seat motor control bag feffi, 12:
Manual switch, 14: Memory switch, 16:
Central processing unit, 18: Low voltage power supply, 20: Seat (
driver seat, movable parts),? 2 Nigeed Pack (
(movable member), 24 Nijito slide device (seating posture control device), 26: 'J-clining device (seating posture control device), 30, 32: positive control detection means (rotation sensor), 42: microcomputer (microcomputer) , 4
4: Relay control circuit, 66: Battery (power supply), 68
70: Voltage supply path, 72: Voltage control relay, 72a
: Relay contact.

Claims (4)

[Claims] (1) A motor control method for a power seat in which movable members can be arbitrarily set by activating a seating posture control device through motor drive control. During automatic control, the motor is always driven at a constant high speed by the voltage supplied from the power supply, and during manual control, the motor is started at high speed by the voltage supplied from the power supply. A power seat motor control method that switches the voltage applied to the motor to a low voltage after a predetermined period of time has elapsed from the time of starting, and drives the motor at low speed rotation. (2) The power seat motor control method according to claim 1, wherein the rotational speed of the motor during high-speed driving is a steady speed under a rated applied voltage. (3) A series of motors that move the movable members of the seating posture control device attached to the seat, a manual switch that can arbitrarily drive the motor and adjust the position of the movable members of the seating posture control device, and a manual switch that can arbitrarily adjust the position of the movable members of the seating posture control device. a memory switch that stores and reproduces the position of the movable member of the seating posture control device as a memory position; and a memory switch that processes the input information according to a predetermined program.
It is equipped with a central processing unit that drives the motor and controls the voltage supplied to the motor, and a low-voltage power supply that reduces the voltage supplied from the power supply to a predetermined low voltage. The motor is always driven at a constant steady speed under the supply voltage from the motor, and under manual control using a manual switch,
The voltage supplied from the power supply drives the motor at a steady speed for a predetermined period of time after starting, and after the predetermined period of time, the voltage applied to the motor is automatically switched to a low voltage from the low-voltage power supply, and the motor starts running. A motor control device for a power seat that is driven at low speed. (4) A power supply and a series of motors are connected by parallel voltage supply paths, a low voltage power source is interposed in one path, and a relay contact is interposed in the other path, and when the relay contact is closed, , voltage from the power supply is applied to the motor, driving the motor at high speed, and when the relay contact opens, low voltage from the low voltage power supply is applied to the motor, driving the motor at low speed. A motor control device for a power seat according to claim 3.