JPH0727839Y2 - Motor drive control circuit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] <Industrial field of application> The present invention relates to a motor drive control circuit, and particularly to a motor drive control circuit suitable for use in an automatic lifting device for a radio receiving antenna for an automobile. Regarding

<Prior Art> There are various devices for selectively reciprocally moving an operating member by a motor. For example, as shown in FIG. 3, a radio receiving antenna for an automobile is automatically moved up and down by a motor capable of forward and reverse rotation. What is shown is known.

In the device including the conventional motor drive control circuit shown in FIG. 3, a motor unit for raising and lowering the antenna 21 is used.
A motor 23 capable of forward and reverse rotation and a relay plate adapted to interlock with the motor 23 via, for example, a speed reduction mechanism.
24 and are provided. The relay plate 24 rotates clockwise and counterclockwise in the drawing according to the forward and reverse rotation of the motor 23. One terminal 23a of the motor 23 is always in electrical contact with the relay plate 24 over its rotation range, and the relay plate 24 is electrically electrically connected to the relay plate 24 as the motor 23 rotates. As a position switch for detecting each position of the antenna 21 by turning on / off, a lower limit detection contact 25 for detecting the lower limit position of the antenna 21, an upper limit detection contact 26 for detecting the upper limit position,
An ascending intermediate detection contact 27 for detecting an intermediate stop position when ascending and a descending intermediate detection contact 28 for detecting an intermediate stop position when descending are arranged at appropriate positions. That is, as shown in FIG. 4, the contacts 25 to 28 are turned on / off at the respective stop positions of the lower limit, the middle limit and the upper limit of the antenna 21.

The motor 23 is drive-controlled via a relay circuit 29. The positive voltage terminal of the battery 30 as a power source is directly connected to the relay circuit 29, and is also connected through the ignition switch IG and the radio switch RS in series. The one directly connected to the relay circuit 29 of the positive voltage terminal of the battery 30 is connected to each common contact of the pair of relays RL4 and RL5 in the relay circuit 29. When the radio switch RS is off, both relays RL4 and RL5 are in the non-excited state and the above voltage
5 through the diode D1 through the falling limit detection contact 25
When the radio switch RS is turned on, both relays RL4 and RL5 are excited and the motor 23 is supplied via the relay RL4.
The voltage is supplied to the other terminal 23b.

Further, a mode switch MS is connected to the relay circuit 29, and when the mode switch MS is switched to a full range drive (hereinafter referred to as FULL) side that allows the antenna 21 to move to both operation limit positions, a short circuit signal is relayed. Intermediate drive (hereinafter HALF) that is input to the circuit 29 and enables the antenna 21 to move to the intermediate position.
The short circuit signal is released by switching to the ()) side. If the mode switch MS is selected to the FULL side when the radio switch RS is on, the relay circuit 29
The pair of relays RL6 and RL7 therein are excited, and the ascending limit detecting contact 26 and the descending limit detecting contact 25 are connected to each other via the diode D2 and the diode D1 in series via the relay RL6. When the mode switch MS is set to HALF, both relays RL6 and RL7 are de-energized, the rising intermediate detection contact 27 and the falling limit detection contact 25 are connected to each other via relay RL6, and the intermediate detection during falling is performed. Contact 28 is grounded through the coil of relay RL8 and through relay RL7. In the non-excited state of the relay RL8, one ends of the coils of the relays RL4 and RL5 are grounded via the relay RL8. When the radio switch RS is turned on in this state, the relays RL4 and RL5 are excited.

In the antenna automatic lifting device configured in this way,
When the radio switch RS is turned on in the state shown in FIG. 3 in which the antenna 21 is located at the lower limit, both relays RL4 and RL5 are excited and the motor 23
The positive voltage of the battery 30 is supplied to the terminal 23b of the motor and the terminal 23a of the motor is grounded via the diode D2. Therefore, the power source flows from the terminal 23b to the terminal 23a, the motor 23 rotates, and in this case, the antenna 21 rises. When the antenna 21 reaches the rising limit, the rising limit detecting contact 26 is turned off as shown in FIG. 4, so that the motor 23 is stopped.

According to this conventional structure, when the mode switch MS is switched to the HALF side in order to lower the antenna 21 to the intermediate position when the antenna 21 is located at the upper limit, both relays RL
6, RL7 is de-energized and one end of the coil of relay RL8 is grounded.
The current going to 3a flows through the coil of relay RL8.
Since both relays RL4 and RL5 are in a non-excited state, a current flows from the terminal 23a to the terminal 23b to the motor 23 via both relays RL4 and RL5, and the antenna 21 can be lowered. .

As described above, in the above-described conventional structure, the operation when lowering the antenna 21 from the ascending limit position to the intermediate position is complicated, and therefore its reliability is low. Further, since a motor drive current flows through the diode D2 when rising and through the diode D1 when falling, a large capacity diode must be used.
Further, since the one terminal 23a of the motor 23 and the relay plate 24 are connected to each other, the wiring inside the motor unit 22 must be performed, which causes a problem that the work is difficult.

<Problems to be Solved by the Invention> In view of the problems of the prior art as described above, a main object of the present invention is to provide a motor drive control circuit that can reduce the number of components and simplify the drive circuit. is there.

[Structure of the Invention] <Means for Solving the Problem> According to the present invention, a motor capable of reciprocating the working member for reciprocating between the first and second working limit positions is provided. And a single-pole double-throw type in which common contacts are connected to both terminals of the motor, and one of the selection contacts is alternately switched to a DC power source.
A relay and a second relay, a single-pole double-throw type third relay having a common contact connected to the other selection contact of the second relay, and the other selection contact of the first relay are connected to ground. And a second operation limit switch that opens when the operation member is located in the second operation limit, and one selection contact of the third relay is connected to ground, and the operation member has the first operation contact. A first operation limit switch that opens when it is in the operation limit position, and the other of the selection contacts of the third relay are connected so as to be grounded, and the operation member has the intermediate position and the first operation limit position. A first intermediate switch that opens when in between and a second intermediate switch that opens when the actuating member is between the intermediate position and the second actuated limit position
An intermediate switch, an operation limit stop mode for moving the operation member to any one of the first operation limit and the second operation limit, and an intermediate stop mode for moving the operation member to the intermediate position. When the operation limit stop mode is selected, the first relay is switched to the connection state with the DC power supply and the second relay is switched to the connection state with the third relay. The third relay is switched to the side in which the third relay is connected to the first operation limit switch, and when the intermediate stop mode is selected, the first relay is connected to the second operation limit switch and the first relay is connected to the second operation limit switch. Stop position selecting means for switching the two relays to a side for connecting to the DC power source and for switching the third relay to a side for connecting to the first intermediate switch; When the second intermediate switch is opened with the intermediate stop mode selected, the first relay is switched to the connection state with the DC power supply and the second relay is switched to the side with the connection state with the third relay. It is achieved by providing a motor drive control circuit characterized by having a relay control means for

<Operation> In this way, the relay used in the motor drive control circuit for selectively stopping the operating member interlocked with the motor at both the operation limit position and the intermediate position is connected to both terminals of the motor. It is only necessary to use the first and second relays and the third relay that switches when the operation limit stop mode or the intermediate stop mode is selected, and the number of relays can be minimized to simplify the circuit. Can be converted.

<Embodiment> Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a motor drive control circuit of an automatic elevator apparatus for an automobile antenna to which the present invention is applied. As shown in FIG. 1, this device has a motor unit 1 and a control unit 2. The positive voltage terminal of the battery 3 serving as a DC power source is connected to the power supply terminal a of the control unit 2 via the fuse F1, and the ignition switch is provided between the positive voltage terminal of the battery 3 and the terminal b.
The IG, the fuse F2 and the radio switch RS are connected in series, and the terminal c is grounded. A mode switch MS as stop position selecting means is connected between the terminals d and e, and the terminal e is connected to the terminal c in the control unit 2 and grounded.

An antenna 4 as an operating member is provided in the motor unit 1.
A motor 5 capable of moving up and down is provided, and a relay plate 6 interlocking with the motor 5 and similar to the conventional example are provided. Both terminals 5a and 5b of the motor 5 are connected to the corresponding terminals f and g of the control unit 2, respectively. The relay plate 6 includes a lower limit detection switch 7 as a second lower limit switch for detecting a lower limit as a second lower limit position and a first lower limit limit for detecting each position of the antenna 4. A rising limit detection switch 8 as a first operation limit switch for detecting a rising limit as a position, and an ascending middle detection switch 9 as a first intermediate switch for detecting an intermediate stop position at the time of rising.
And the second for detecting the intermediate stop position when descending
A descending intermediate switch 10 as an intermediate switch is provided, and one contact of each switch 7 to 10 is connected to each corresponding terminal h to k of the control unit 2 and each contact 7 ~ 10 common contacts are connected to terminal 1.

Next, the circuit configuration in the control unit 2 is shown below. The terminals f and g connected to both terminals 5a and 5b of the motor 5 are connected to common contacts C1 and C2 of a pair of single-pole double-throw contact type relays RL1 and RL2, respectively. Both relays RL
One end of the coil of 1, RL2 is connected to the terminal b, and the other end is connected to the terminal d via the diode D2, so that the mode switch MS is grounded when the FULL side is selected. There is. One contact S1 that is normally open as one selection contact of the relay RL1 and one contact S2 that is normally closed as one selection contact of the relay RL2 are connected to the terminal a, and the voltage of the battery 3 is supplied. There is. Relay RL1
The normally closed contact S3 is connected to the terminal h as the other selected contact of, and the normally open contact S3 is connected as the other selected contact of the relay RL2.
4 is connected to the common contact C3 of the single-pole double-throw contact type relay RL3. A normally open contact S5 as one selection contact of the relay RL3 is connected to the terminal i, and a normally closed contact S6 as the other selection contact is connected to the terminal j. One end of the coil of the relay RL3 is connected to the terminal d, and the other end is connected to the terminal b. Also, terminal b has a contact resistance
It is connected to the terminal k through R1 and a diode D1 for dealing with reverse connection due to power supply fluctuation.

The diodes D2 side of the coils of both relays RL1 and RL2 are connected to the terminal c via the Zener diode ZD1 for surge prevention, grounded, and connected to the collector of the transistor T1. The base of the transistor T1 is connected between the resistor R1 and the diode D1 via the Zener diode ZD2, and the resistor R2 and the capacitor C are connected.
Are connected in parallel to each other to the terminal c and are grounded, and the emitter of the transistor T1 is also connected to the terminal c via the diode D3 for reverse connection and is grounded. The capacitor C and the Zener diode ZD2 are for the noise of the transistor T1 and for stabilizing the base potential.
The diodes D4 and D5 for surge absorption are connected to the coils of the relays RL1 to RL3, respectively.

A relay control circuit 11 as a relay control means is configured by the transistor T1 and each of the other elements described above.
That is, the mode switch MS is the HALF in the intermediate stop mode.
When the radio switch RS is on, the antenna 4 is lowered to the intermediate position and then stopped according to the detection signal from the descending intermediate detection switch 10 as described later. be able to.

FIG. 2 shows the ON / OFF states of the switches 7 to 10 corresponding to the position of the antenna 4 similarly to FIG. 4 of the conventional example. Refer to FIG. 2 for the operating procedure of this device. And shown below.

FIG. 1 corresponds to a state in which the antenna 4 is located at the lower limit. If the ignition switch IG is turned on and the radio switch RS is turned on from this state, the relay RL
The coils of 1 and RL2 are excited, and the positive voltage of the battery 3 is supplied to the terminal 5a side of the motor 5. Also, as shown in the figure, the mode switch MS is the FU
When the LL side is selected, the terminals d and e are short-circuited and one end of the coil of each relay RL1 to RL3 is grounded, so each relay RL1 to RL3 is excited and the terminal 5b of the motor 5 is connected.
The side is grounded via the contact S4 of the relay RL2 and the contact S5 of the relay RL3, and also via the rising limit detection switch 8. Therefore, a current flows in the motor 5 in the direction indicated by the solid arrow from the terminal 5a to the terminal 5b, and the antenna 4 rises.

When the antenna 4 reaches the ascent limit position, the ascent limit detection switch 8 is turned off and the motor 4 is stopped.
In addition, when the mode switch MS is switched to the HALF side, the relay RL3 is in the non-excited state, but the transistor T1
Is turned on and both relays RL1 and RL2 are excited. Therefore,
The terminal 5b of the motor 5 is connected to the contact S4 of the relay RL2 and the relay RL3.
Since it is grounded via the contact S6 of the motor and the intermediate detection switch 9 at the time of rising, a current flows through the motor 5 in the direction of the solid arrow to raise the antenna 4 and the antenna 4 moves to the intermediate position. When it reaches, the ascending intermediate detection switch 9 is turned off and the motor 4 is stopped. When the antenna 4 is lifted from the intermediate position, the relays RL1 to RL3 are excited by switching the mode switch MS to the FULL side, and the antenna 4 reaches the lift limit and stops in the same manner as described above.

Next, when lowering the antenna 4 from the upper limit to the intermediate position, the radio switch RS is turned on and the mode switch MS is switched to the HALF side. Then,
Relay RL3 is de-energized and both relays RL1, RL2
Is also in the non-excitation state, but since the down limit detection switch 7 shown in FIG. 2 is in the on state, the terminal 5a of the motor 5 is
However, since it is grounded via the contact S3 of the relay RL1 and the lower limit detection switch 7, a current flows in the motor 5 in the direction of the dotted arrow shown from the terminal 5b to the terminal 5a,
The antenna 4 descends. Then, when the antenna 4 reaches the intermediate position, the forward / reverse rotation switching relay control circuit 11 turns off the descending intermediate detection switch 10 to turn on the transistor T1 and re-energize the relays RL1 and RL2. It At this time, since the rising intermediate detection switch 9 is in the off state, the drive current cannot flow in the motor 5, and the rotation of the motor 5 is stopped.

Further, when lowering the antenna 4 from the intermediate position to the lower limit position, the ignition switch IG or the radio switch RS is turned off. Then both relays RL1, R
Since L2 is in the non-excited state and the lower limit detection switch 7 is in the ON state, a current flows from the terminal 5b to the terminal 5a in the motor 5, and the antenna 4 descends. When the antenna 4 reaches the lower limit, the lower limit detection switch 7 is turned off and the motor 5 is stopped. The antenna 4
When lowering the switch from the upper limit position to the lower limit position at once, when the mode switch MS is switched to the FULL side, the ignition switch IG or the radio switch RS
Turn off. In this case, descending intermediate detection switch
Regardless of whether the relay 10 is turned on or off, the relays RL1 to RL3 are in the non-excited state, and the motor 5 continues to rotate until the lower limit detection switch 7 is turned off. Therefore, the antenna 4 can be lowered to the lower limit position. .

As described above, according to the present invention, the relay for appropriately stopping the antenna 4 at each of the operation limit position and the intermediate position is provided with a pair of relays for rotating the motor 4 in the normal and reverse directions, and whether the entire drive or the intermediate stop drive is performed. It can be configured with one relay for switching. Therefore, the number of relays can be further reduced, for example, when the circuit is configured by a relay having a coil for each contact, and the number of parts of the motor drive control circuit of the device as in the embodiment is suitable. Can be reduced to In this embodiment, the relays RL1, RL2
Although separate driving coils are provided in each, it goes without saying that one common coil may be used for driving.

Further, since the common terminals of the switches 7 to 10 of the relay plate 6 are grounded and are not directly connected to the terminals of the motor 5, the wiring structure in the motor unit 1 can be simplified and the relay plate 6 The degree of freedom of the common terminal structure is large. With the above structure, the motor drive control circuit can be simplified, and the drive stop operation can be further stabilized. Also, with this circuit configuration,
It is not necessary to provide a diode on the line through which the motor drive current flows, and a large capacity diode is not required.

[Effects of the Invention] As described above, according to the present invention, the motor drive control circuit for selectively stopping the operation member interlocked with the motor after moving to both operation limit positions or the intermediate position is minimized. Since it can be configured by using a number of relays, the number of parts can be reduced, the structure of the circuit can be simplified, the connection cost can be reduced, and the reliability of operation can be further enhanced.

[Brief description of drawings]

FIG. 1 is a circuit diagram of an automatic elevator device for an automobile antenna to which the present invention is applied. FIG. 2 is an explanatory diagram showing the operating state of each position detection contact according to the position of the antenna. FIG. 3 is a circuit diagram of a conventional automatic lifting device for an automobile antenna. FIG. 4 is an explanatory diagram showing the operating state of each position detection contact according to the position of the antenna in the conventional device. 1 ... Motor unit, 2 ... Control unit 3 ... Battery, 4 ... Antenna 5 ... Motor, 5a, 5b ... Terminal 6 ... Relay plate, 7 ... Down limit detection switch 8 ... Rise limit detection switch 9 ... Rise intermediate detection switch 10 … Down intermediate detection switch 11… Relay control circuit 21… Antenna 22… Motor unit 23… Motors 23a, 23b… Terminal 24… Relay plate 25… Down limit detection contact 26… Up limit detection contact 27… Up intermediate detection contact 28 … Intermediate detection contact when descending 29… Relay circuit, 30… Battery

Claims (1)

[Scope of utility model registration request] 1. A motor (5) capable of reciprocating forward and backward for reciprocating an operating member (4) between first and second operating end positions.
And a single-pole double-throw type in which a common contact is connected to both terminals of the motor (5), and one of the selection contacts (S1, S2) is switched so as to be alternately connected to a DC power source. One relay (RL1) and second relay (RL2), and a single-pole double-throw third relay (RL3) in which a common contact (C3) is connected to the other selection contact (S4) of the second relay (RL2). )
And a second operation limit switch which is connected to ground the other selection contact (S3) of the first relay (RL1) and which opens when the operation member (4) is located in the second operation limit. (7) and one selection contact (S5) of the third relay (RL3) are connected so as to be grounded, and the operation member (4) is opened when the operation member (4) is in the first operation limit position.
The operation limit switch (8) and the other selection contact (S6) of the third relay (RL3) are connected so as to be grounded, and the operation member (4) has the intermediate position and the first operation limit position. First intermediate switch (9) that opens when it is between
A second intermediate switch (10) that opens when the operating member (4) is between the intermediate position and the second operating limit position; and the operating member (4) to the first operating position. The operating limit stop mode (FULL) for moving to the position of either the limit or the second operating limit and the intermediate stop mode (HALF) for moving the operating member (4) to the intermediate position. When the operation limit stop mode (FULL) is selected, the first relay (RL1) is connected to the DC power source and the second relay (RL2) is connected to the third relay (RL3). The third relay (RL3) and the first operation limit switch (8).
When the intermediate stop mode is selected, the first relay (RL1) is switched to the second connection state.
The second relay (RL2) is connected to the operation limit switch (7) and the second relay (RL2) is connected to the DC power source, and the third relay (RL3) is connected to the first intermediate switch (9). Stop position selection means (MS) for switching to the connection state of the above, and the intermediate stop mode (HALF)
Is selected, the second intermediate switch (10) is opened to bring the first relay (RL1) into connection with the DC power source and the second relay (RL2) to the third relay (RL3). A motor drive control circuit, comprising: a relay control means (11) for switching to a side to be connected to.