JP2847535B2 - Motor drive control device for electric antenna - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor control device for a drive of a vehicle-mounted electric antenna expansion and contraction device, and more particularly to an operating voltage of a drive motor to prevent motor burnout. More particularly, the present invention relates to an improvement to be lightweight, small, built-in, and inexpensive.

[Summary of the Invention] Relays are interposed in the power supply circuits on the ascending and descending sides of the motor for driving the electric antenna, and the relays do not operate when the supplied voltage is lower than a predetermined voltage, thereby restricting the power supply to the motor. Thus, there is provided a motor drive control device for an electric antenna for preventing burnout of a motor.

[Related Art] As a conventional electric antenna control device, a limit switch type, a bimetal type, an electronic circuit type, or the like, which has a burnout protection function, has been proposed and implemented. The tenth most commonly used inexpensive
There is a control circuit using a limit switch shown in the figure. In the figure, 1 is a motor for driving an antenna, 2 is a limit switch for setting an ascending limit and a descent limit, 3 is a relay for switching the power supply on the ascending side and descending side of the motor 1, and 4 is a relay for turning on and off the power of a radio or the like. 3 for driving the relay. A power supply such as an on-vehicle battery is applied to the terminal 3 ', an operating voltage is applied to the terminal R by turning on a radio or the like, a current flows through the coil 4, and the coil 4 causes each contact of the relay 3 to rise. Switched, motor 1
Is driven to extend an antenna (not shown). When the antenna reaches the upper limit, the limit switch 2 is actuated by a cam or the like mechanically interlocked with the motor 1 and stops when the power supply to the motor 1 is cut off. When the power supply of the radio or the like is turned off, the coil 4 is de-energized, and the respective contacts of the relay 3 are switched to the descending side, the motor 1 is reversed, and the antenna starts descending. The descending side operates, the power supply to the motor 1 is cut off,
Stop.

[Problems to be Solved by the Invention] However, the conventional control device using the above-described limit switch does not cause a problem when the charging of the vehicle-mounted battery is normal, but the power supply voltage is a nonstandard voltage due to insufficient charging or the like. In such a case, the driving force of the motor 1 becomes insufficient, and the limit switch 2 becomes inoperative at the ascending or descending limit. Therefore, the power supply to the motor 1 is not interrupted, and the constraint current flows through the motor 1. In this state for a long time, the motor will burn out.

[Object of the Invention] Therefore, an object of the present invention is to regulate the minimum operating voltage by a relay so that power is not supplied to a motor for driving an electric antenna when the power supply voltage is a non-standard low voltage. The power is supplied by operating the relay with a voltage that obtains sufficient motor torque to fully operate the limit switch,
An object of the present invention is to provide a motor drive control device that can prevent the motor from being burned.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a method for controlling an antenna via a limit switch that sets the ascending and descending limits of the antenna in conjunction with turning on and off the power of a radio or the like or by manual operation. A power supply is supplied to an antenna driving motor that performs ascent and descent, and the limit switch is mechanically interlocked with the motor and is turned off at an ascent or descent limit. A relay is interposed in each of the power supply circuits on the ascending side and the descending side of the motor, and the operating voltage of the relay is set to the minimum sensitive voltage at which a motor torque sufficient to operate the limit switch can be obtained. The main point is that power is supplied to the power supply.

[Operation] If the power supply voltage of the vehicle-mounted battery is low due to insufficient charging or the like, and the radio or other antenna driving instruction power supply is turned on, first the electromagnetic force of the raising relay of the motor power supply circuit on the rising side is turned on. Since the coil is insensitive, the circuit is not formed and the motor does not drive. Also, even when descending,
Since the electromagnetic coil of the descending relay is insensitive, no circuit is formed as described above, and the motor is not driven. Therefore, each dedicated relay is interposed in the power supply circuit at the time of rise and fall, and the operating voltage of the relay is set to a voltage that can obtain a motor torque sufficient to operate the limit switch at a minimum sensitive voltage. Thus, it is possible to prevent the motor from burning.

[Embodiment] The present invention will be described below with reference to an embodiment shown in the drawings. FIG. 1 shows an embodiment of an electric antenna drive control device according to the present invention. FIG. 10 shows a conventional lowering relay 5 connected between the motor 1 and the limit switch 2 of the conventional example shown in FIG. 10. The relay 5 is, for example, a one-circuit, two-contact voltage detection relay employing a sensitive voltage setting method. It is. Also, relay 3
Is a two-circuit, two-contact voltage detection relay that employs a sensitive voltage setting method in the same way as the relay 5. Are switched from b → ad → c, respectively, current flows through the drive coil 6 of the relay 5 and the contact
7a is switched to 7b to supply power to the motor 1, sufficient antenna drive is performed, and the limit switch 2 is accurately turned off. If the power supply voltage is lower than the standard voltage on the falling side, the contacts of the relay 3
Even when switching from ac to d, no sensitive voltage is applied to the driving coil 6 of the relay 5, so that the contact remains connected to 7a and power is not supplied to the motor 1, so that the antenna does not operate. Therefore, burning of the motor 1 is prevented regardless of the limit switch 2.

As shown in FIGS. 2 and 3, the relay 5 may be of a switching type, which operates equivalently, or a voltage control type, as shown in FIG. In these figures,
8 and 9 are Zener diodes, and 10 and 11 are transistors.

FIG. 5 shows a modification of another embodiment according to the present invention, wherein S is a connection terminal to a starter circuit,
The contact 5 'of the relay 3 is connected between the middle point different from the two circuit B contact B of the relay 3 and the ground. In this example as well, the motor 1 can be protected from burnout as in FIG.

FIG. 6 shows another embodiment in which a one-circuit two-contact relay is used for the ascending and descending circuits, each of which has a dedicated sensitive voltage setting. Dedicated relays 16 are used for ascending and 17 are used for descending.
And 19 are ascending and descending limit switches, and 20 is a diode. Terminal 22 if the power supply voltage is higher than the specified voltage
When an operating voltage is applied to the ascending circuit shown in FIG.
When power is supplied to the motor 1 and the antenna is driven,
The limit limit is set by the limit switch 18. When the operating voltage is not applied to the terminal R at the time of lowering, the contact of the relay 16 is connected to the ground side, the relay 17 is driven, and the contact of the relay is switched to form a lowering circuit, and the motor 1 rotates in the reverse direction. The lowering of the antenna is performed, and the lowering limit is set by the limit switch 19. When the power supply voltage is a nonstandard voltage, each of the relays 1 is used in the same manner as in the embodiment of FIG. 1 or FIG.
Motors 6 and 17 do not respond, so motor burnout can be prevented.

FIG. 7 shows a modification of FIG. 6, in which the diode 20 is omitted. The operation sequence of this example is shown below.

Ascending relay 16 on Relay 17 off Rising end Relay 16 on Relay 17 off Falling relay 16 off Relay 17 on Falling end Relay 16 off Relay 17 off FIG. 8 is another modification of FIG.
In order to remove the diode 20 by using the automatic return function of 18, 19, a grounding contact 1 is placed on the off side of the limit switch 18.
8 'is provided.

When the limit switch 18 enters the ground contact 18 'at the upper limit position, the descent is started, but automatically returns to the contact 18 "immediately after the descent operation. This return operation is performed in a very short time. Then, the operation due to the power-off does not continue.

FIG. 9 shows still another modification of FIG.
Perform the voltage sensing function. In the examples shown in FIGS. 8 and 9, the limit switch has a ground contact, so that a braking action by utilizing the back electromotive force of the motor works, and a fluttering prevention function of the switch mechanism is obtained.

[Effects of the Invention] As described above, according to the present invention, it is detected that the power supply voltage applied to the antenna driving motor is a voltage that obtains a motor torque sufficient to completely operate the limit switch. Therefore, a voltage detection relay that is sensitive to a power supply voltage higher than a predetermined standard is used, and power is supplied up or down through this relay to prevent motor burnout due to inactivation of the limit switch. It can be reduced in weight and size, and can be built in the antenna driving body.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing one embodiment of the present invention, and FIGS.
FIG. 4 and FIG. 4 are circuit diagrams showing modified examples, respectively. FIGS. 5 to 9 are circuit diagrams showing another embodiment of the present invention, respectively.
The figure is a circuit diagram of a conventional example. 1 ... antenna driving motor, 2 ... limit switch, 5 ... motor control relay.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-62-233902 (JP, A) JP-A-56-13803 (JP, A) JP-A-56-78202 (JP, A) 188805 (JP, U) Actually open Sho 61-72903 (JP, U) (58) Field surveyed (Int. Cl. ⁶ , DB name) H01Q 1/10

Claims (1)

(57) [Claims] 1. An antenna driving motor for raising and lowering an antenna through a limit switch for setting an ascending and descending limit of the antenna in conjunction with turning on / off of a power supply of a radio or the like or manually. The limit switch is configured to be turned off at an ascending limit or a descending limit in mechanical linkage with the motor. In the control device for driving the motor of the electric antenna, the limit switch is connected to a power supply circuit on an ascending side and a descending side of the motor. An electric motor is provided in which an electric power is supplied to the motor by setting an operating voltage of the relay at a minimum responsive voltage at which a motor torque sufficient to operate the limit switch can be obtained by interposing a relay. A motor drive control device for the antenna.