JPH01114385A - Motor controller - Google Patents

Abstract

PURPOSE:To prevent the burning of a motor from being generated, by switching the motor from operating to stopping, with the logical product of the non- working of a detection switch working with the energy of an electromagnetic brake and the working of a time limiting switch. CONSTITUTION:The controller of a motor 1 is composed of an electromagnetic brake 2, electromagnetic contactors 4-5 for normal rotation and reverse rotation, a rectifier 6, a resistor 7, electromagnetic contactors 9-10, switches 11-13 for stopping, normal rotation, and reverse rotation, a timer 14, and the like. Then, a switching means 30 for switching the motor 1 to operation or stopping is composed, and the motor 1 is stopped and protected, or operation like this is executed. Besides, a detection switch (relay) 21 connected to a resistor or the like for determining the attracting current of the electromagnetic brake 2 and working with the applied energy of the brake 2, a time limiting switch (timer) 23, a relay 22, and their contacts are arranged. Then, by the applied energy of the electromagnetic brake 2, the time limiting switch 23 is worked, and at the time of the non-working of the detection switch 21 of the applied energy of said brake 2, the switching means 30 is switched to the stopping of the motor 1.

Description

[Detailed description of the invention] [#Application fields of Tojo] This invention relates to a control device for an electric machine.

[Conventional technology]

FIG. 8 is an electric circuit diagram showing a conventional motor control device. In FIG. 1, 111 is a [jammer], (21 is a motor
Normally closed contact of thermostat built into tit H electric motor Ill, 14
1 is an electromagnetic contactor for forward rotation of the electric motor 111, and is the main contact r4a)
and auxiliary contacts (41r+, (401 and (4a).
d) is (Iff). (61 is the !!! accent for the electromagnetic brake circuit, (7) is the electromagnetic brake (resistor that determines the attraction current of 21, (91 and (1α) are the electromagnetic brake;
) are each equipped with main contacts (9a) and (10a). συ is a switch for stopping the electric motor +11, u21 is a switch for forward rotation of the t-spinning machine +11, bet is a switch for reversing the electric motor (!1), and α4 is a timer equipped with a time limit contact (1aa).

In addition, - is a switching means for switching between operation and stop of the 14cwJ machine +11, and the above-mentioned forward rotation power output 9! Sword (
41 and its auxiliary contacts (4b) and (4d), the above-mentioned reversing electromagnetic contactor 16) and its auxiliary contacts (5b) and (5
d), consists of a stop switch Uυ of machine Il+, a switch for forward rotation, a switch for reverse rotation, and a normally closed contact 13 of the thermostat;

Next, the operation will be explained. Now, in order to run the Gysuke machine H1 in the forward rotation direction from the stopped state, press the forward rotation switch ++2.
i First, close it. Then, the forward rotation electromagnetic contactor 41 is excited, its main contact (4a) is closed, a positive phase voltage is applied to the motor from a power supply (not shown), and torque in the forward rotation direction is generated. At this time, the forward rotation electromagnetic contactor 141 is self-held by the auxiliary contact (4b).

10,000, the electromagnetic contacts @6 i91, +101 and timer 04 are excited by the forward rotation electrical box contact 1@auxiliary contact r4c of device 141), and the main contact (9a) of 1 magnetic contact @device (9) and (]O1 and (10a) are closed.Then, an attraction current determined by the resistor (8) flows to the electromagnetic brake ? The brake of the motive Ill is released, and the 1! motive +11 starts rotating in the forward direction (B).The magnetic brake (2) requires a large II! current to attract it, but if it is attracted, a small current is generated. It can be held with

Now, when the set time of the timer 04 has elapsed, its time-limiting contact (14a) is opened, so that the electromagnetic contactor Mtlol is demagnetized and its main contact (10a) is opened. Then, the electromagnetic brake (electricity flowing to 21/1
is reduced by the resistor (71) to a holding current value, and the temperature rise of the coil of the electromagnetic brake (21) is suppressed.

When the electric motor Ill (I-i is stopped when the I-i stop switch Uυ is operated, the forward rotation electromagnetic contactor 14) and the electromagnetic contactor i91 are demagnetized, and the self-holding of the forward rotation electromagnetic contactor +41 is also released and their Main contacts (4a) and (9a)
φI is opened. Therefore, the electric motor +11 is disconnected from the power source (not shown), and the electromagnetic brake (2) is also turned off, so that a mechanical braking action is performed, so that the exciter il+ immediately stops.

My father, the thermostat is a No-1tIIllIJ machine (11
When overload occurs, it operates due to temperature rise to open its normally closed contact 13;, extinguish the forward rotation magnetic contactor (4), and open its main contact (4a). It stops and protects Il+.

In addition, to rotate the electric motor +11 'i one river in the reverse direction.

Operate the reverse switch a3 instead of the forward rotation switch α, and connect the reverse rotation electromagnetic contactor (instead of the forward rotation electromagnetic contactor 41).
5 t51 f Since the operation is the same as in the case of normal rotation, the explanation will be omitted.

[Problem that the invention seeks to solve]

Since the conventional '+4R mechanical AL device is configured as described above, it can be used in situations such as when breakage occurs between the fluorescent lamp and the electromagnetic brake coil, or when the electromagnetic contactor for electromagnetic brake control malfunctions. If the electromagnetic brake is not energized and the voltage is applied to the motor for more than a certain period of time during an abnormality, the motor becomes locked and burns out.

This invention solves the above problems! Is it something that was done to erase the electric motor? An object of the present invention is to obtain a motor control device that can prevent burnout of an 11t #J machine when the brake is not excited.

[Means for solving problems]

The motor control device according to the present invention includes a switching means for switching between running and stopping the motor, a time limit switch that operates when a predetermined time elapses after the switching means switches to operation, and a VC switch that turns off the VC when the switching means is in a stopped state. The electromagnetic brake is energized to brake the electric motor, and is energized to release the braking when the switching means is in operation, and a detection switch that operates when the electromagnetic brake is energized, and the time limit switch is activated. Further, when the detection switch does not operate, the switching means switches to stop the electric motor.

[Effect]

In the [#J machine sub-side device in this invention, the logical product of the non-operation of the detection switch which operates when the electromagnetic brake is activated and the operation of the time limit switch switches the switching means' from operating the motor to stopping it. so that it acts like this,
This prevents the electric motor from entering an operating state where it is restrained by the electromagnetic brake.

[Embodiments of the invention]

Hereinafter, one embodiment VA1 of the present invention will be explained with reference to FIG.

In FIG. 1,...~Q4, (4a)~(4d),
(5a) to r5d), (9a), (10a) and (J4a) are the same as the conventional 'Jrfllt. t2
11 is a detection switch connected to one end of a resistor and an intermediate tap that determines the attraction current of the electromagnetic brake (2), and is activated when the electromagnetic brake (2) is energized; in this embodiment, a relay is used (hereinafter referred to as (referred to as a relay). (21a) is a normally closed contact of the relay circle. 23 is a switching means -
In this embodiment, a timer is used as a time limit switch that operates after a predetermined time after switching to operation (hereinafter referred to as a timer). (23a) is a time limit contact of the above-mentioned timer. 122i After a predetermined time after switching the switching means c1 to operation, that is, while the timer is operating, if the relay ring is not operating, it will operate, and its normally closed contact (2
2a) is integrated into the switching means.

The relay circle is sufficiently attracted by the voltage drop due to the attraction current of the resistor (ttlt Fi) of the intermediate tap of the resistor (8). Now, in order to operate the electric motor 111 in the forward rotation direction from the stopped state, the forward rotation switch (121'f is first closed. Then, the forward rotation electromagnetic contactor +41 is energized, and its main contact (4a successful! Opens). A positive phase voltage is applied to +11 from a power supply (not shown), and torque in the forward rotation direction is generated.At this time, it is self-maintained by the forward rotation electromagnetic contactor (auxiliary contact L 4t).On the other hand, for the forward rotation The auxiliary contact r4c) of the electromagnetic contactor 141 causes the electromagnetic contactors +91, 1101 and timer 041 to reach 8 ha,
Magnetic contactor (91 and (lω main contact C9a) and (1
0a) is closed. Then, in the electromagnetic brake (!1), an attraction current determined by the resistor (8) flows from the power supply (not shown) through the flow device 16, and ? The opening of electric motor III by tMi brake (!1 is released, and the opening of electric motor I
ll ij Start rotating in the forward direction. At this time, relay (2
The TJ is energized and its normally closed contact (21a) is opened.・The electromagnetic brake (21 requires a large current to attract, but once it is attracted, it can be held with a small current.) Once the set time has elapsed, its time-limited contact (146) opens, thus causing electromagnetic contact @ 6
(101td demagnetized, its main contact (10a) f;
l will be released.

Then electromagnetic brake +! The current flowing through the VC is reduced by the resistor (7) to a holding current value, and a rise in the coil temperature of the electromagnetic brake 121 is suppressed. The ratio of the attraction current to the holding current of the relay circle is the same as the ratio of the attraction current to the holding current of the electromagnetic brake 121, so the electromagnetic brake (21
The relay circle remains energized and its normally closed contact (21a) remains open when is held by the holding current. On the other hand, the timer 23 uses a forward rotation electromagnetic contactor (41
When the auxiliary contact (4C) is closed, it is excited, and after a predetermined time, its time-limited contact (2sa) is closed. The time-limiting contact (28a) is connected in series with the relay, but when the time-limiting contact (23a) closes, the time-limiting contact (23a) Since the relay is connected in series with the
The normally closed contact (Ha) of the relay remains closed, and [#
The lI machine... continues to rotate 101 times in the forward rotation direction.

the above? If the electromagnetic brake 121 is
If an abnormality occurs such as a disconnection between the coil and the current switch (61) or a breakdown of the electric current switch (91) and the electromagnetic brake is demagnetized, the relay circle will become inoperable and the closed contact ( 21a) is closed, so the relay (to) operates,
Since the normally closed contact (22a) is opened, the forward rotation electromagnetic contactor 14) is demagnetized, its self-holding is released, and it is opened.

Therefore, the supply of power (not shown) to the electric motor is cut off and the motor stops. That is, it is possible to prevent the electric motor +11 from being operated while the electromagnetic brake 12: is turned off, resulting in a motor damage accident.

Ill motive... To completely stop, operate the stop switch αυ, and the forward rotation electromagnetic fluid @ device 141 and the electromagnetic welder (9
1 is demagnetized, the self-holding of the forward rotation electromagnetic contactor (4) is subsequently released, and their main contacts (4a) and (9a)
will be released.

Therefore, the electric motor .

In addition, when the electric motor is overloaded, the thermostat operates due to the temperature rise, opens its normally closed contact (31t), completely demagnetizes the forward rotation electromagnetic switch 141, and closes its main contact (4).
a) is opened, and the electric current lJ fI&+t+ is stopped and protected.

In addition, when rotating the 'tJL#lI machine... in the reverse direction, operate the reverse switch 04 on the forward rotation switch side in the above explanation, Since the operation is the same as in the case of forward rotation except that the electromagnetic junction for reverse rotation +51'ff is operated in reverse rotation, the explanation will be omitted.

Above, in the e embodiment, the timer +141 and the timer β are 2.
I am using a timer, but is it the time limit contact of timer 04? The timer s2 may be omitted by using it in place of the time limit point (28a) of the timer/prisoner. In addition, in the above example, a reversible electric motor, that is, an electric motor that can rotate forward and reverse, was explained, but an irreversible electric motor! Similar young fruits are produced on # machines, that is, machines that rotate only in one direction.

In addition, although a three-phase squirrel cage induction motor was used as an example on the road in the above embodiment, similar effects can be obtained with other types of motors.

〔Effect of the invention〕

As described above, the motor control device according to the present invention has ms
A switching means for switching between operation and stop of the machine, a time limit switch that operates when a predetermined period of time has elapsed after the switching means switches to operation, and a time limit switch that is deenergized when the switching means is in a stopped state to open the motor and switch the motor. When the means is in operation, it is energized to perform the above 1+1. JEI
Equipped with an electromagnetic brake that releases J and a detection switch that operates when this electromagnetic brake is energized, 4, when the time limit switch is activated and the detection switch is not activated, ll-1, and the switching means 11t#. Since the switch was made to stop the J aircraft, the electromagnetic brake was deenergized.
This has the effect of preventing an accident in which the tt# machine is operated in the cutting state and the ta machine burns out.

[Brief explanation of the drawing]

FIG. 1 shows a motor control device according to an embodiment of the present invention. The circuit diagram shown in Figure 2 is the conventional one! Motivation M1djAJ! FIG. 2 is a circuit diagram showing the device. In the figure, Il+ is the electric motor, 121 is the electromagnetic brake, c
The at+h relay, Tsuba timer, and Bi are switching means. In Figure 1, the same reference numerals indicate the same or deleted parts.

Claims (1)

[Claims] A switching means for switching between running and stopping the electric motor, a time limit switch that operates when a predetermined period of time has elapsed after the switching means switches to operation, and a time limit switch that is deenergized when the switching means is in a stopped state to brake the electric motor; It is equipped with an electromagnetic brake that is energized to release the braking when the vehicle is in an operating state, and a detection switch that operates when the electromagnetic brake is energized, and when the time limit switch is activated and the detection switch is not activated, A motor control device, wherein the switching means switches the motor to a stopped state.