JPH04125096A - Operation controller for brake motor - Google Patents

Abstract

PURPOSE:To eliminate a shock at the time of starting by suppling a current to a multipolar stator winding at the time of starting, and supplying a current of a reverse phase to that of the current supplied to the winding temporarily to a small polarity stator winding. CONSTITUTION:In the case of a hoisting, currents are supplied from power sources U, V, W to low speed multipolar stator windings through terminals U1, V1, W1 of a 2-stage speed brake motor M. Simultaneously, a normal open contact MC1-2 is closed, a timer T is operated to operate a reverse phase brake relay R in a short time until the normal close contact is opened, and the contact R-1 is closed. Thus, a current of reverse phase to that of the current supplied to the stator winding is supplied to a high speed small polarity stator winding from the terminals U1, V1, W1 of the motor M. Thus, a magnetic field for releasing a brake is increased. Since the motor M is reverse phase braked, the motor M is smoothly started without shock.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention utilizes a multi-polar stator winding for rotating a model rotor motor at low speed, a small-polar stator winding for rotating at high speed, and a magnetic field generated by an armature current. The present invention relates to an operation control device for a braking motor equipped with a brake that can be completely released.

[Prior art]

The above-mentioned braking motor is used as a hoisting motor for a hoisting machine, etc., and is operated at a low speed while waiting for the startup of hoisting and lowering, and then switched to a high speed for operation. In this way, it is used by switching from low speed to high speed, but when the number of poles of the multipolar stator winding for low speed is large, the winding resistance is large, so the armature current is small and the strength of the magnetic field generated by this is weakly controlled. There is a problem that the ratio of high and low speed cannot be increased too much because the motivation cannot be released)
, when the braking motor is started, current is temporarily supplied to the small-polarity stator winding in parallel with the multi-polarity stator winding, and the magnetic field for releasing the brake is increased. In the method of increasing the magnetic field that releases the brake by supplying current in parallel to the multi-polarity stator winding and the small-polarity stator winding, the current also flows to the small-polarity stator winding on the high-speed side at startup. There was a problem in that the electric motor tried to rotate at high speed in order to supply the electric power, which caused a shock.

There was also the problem that the moment the simultaneous energization was switched to the low speed, regenerative braking was applied on the high speed side, causing a shock. This shock is an important problem, especially in hoisting machines.

The present invention has been made in view of the above-mentioned points, and an object of the present invention is to provide an operation control device for a braking motor that does not cause a shock when starting and when switching from high speed to low speed.

[Means to solve the problem]

In order to solve the above problems, the present invention provides a cylindrical cage rotor,
In the operation control device for a braking motor, which includes a multi-polar stator winding, a small-polar stator winding, and a brake that is released by a magnetic field generated by an armature current, a current is applied to the multi-polar stator winding at startup. The present invention is characterized in that a control means is provided for supplying a current having a phase opposite to the current supplied to the multi-polar stator winding temporarily to the small-polar stator winding.

[Effect]

By configuring the operation control device for the braking motor as described above, the braking motor will be in a reverse phase braking state at the time of startup.
There is no shock at startup. Furthermore, when switching from high speed to low speed, there is no shock due to regenerative braking, unlike in conventional systems.

〔Example〕

An embodiment of the present invention will be described below based on the drawings.

FIG. 1 is a circuit diagram of an operation control device for a braking motor according to the present invention. In the figure, M is a two-speed braking motor, U, V,
W is 3-phase AC power supply, MCI is hoisting relay, MC2 is hoisting relay, MC3 is low speed relay, MC4 is high speed relay, Tr is transformer, T is timer, R is reverse phase braking relay, FBI PB2 is a push button switch for hoisting, and PB2 is a push button switch for lowering.

The two-speed braking motor M has terminals Ul, Vl, Wl of the multi-polar stator winding for low speed and terminals Ul, V2 . It has W2. In addition, the hoisting pushbutton switch FBI and the hoisting pushbutton switch FB2 are two-stage pushbutton switches, with the first stage setting a low speed and the second stage setting a high speed. .

In the operation control device having the above circuit configuration, in the case of hoisting operation, when the hoisting pushbutton switch FBI is pressed one step, the normally open contact FBI-1 closes and the normally closed contact FBI-3
opens, thereby operating the hoisting J-ray MCI and closing its normally open contacts MCl-1 and MCl-2. Normally open contact M
By closing Cl-2, low speed relay MC3 operates and closes its normally open contact MC3-1. As a result, current is supplied from the power supplies U, V, and W to the low-speed multipolar stator windings through the terminals Ui, Vl, and Wl of the two-speed braking motor M. At the same time, the normally open contact MCl-2 closes, which causes the timer T to operate and reverse phase braking rule R for a short period of time until the normally closed contact opens, and the normally open contact R-1 then closes. close. As a result, the terminal Ul of the two-speed braking motor M.

A current having a phase opposite to the current supplied to the multi-polar stator winding can be supplied from V2 and W2 to the small-polar stator winding for high speed.

As a result, current is supplied to the small-polarity stator winding at the same time as the multi-polar stator winding, so the armature current increases and the magnetic field for releasing the brake increases. In addition, since the two-speed braking motor M is in a state where reverse phase braking is applied,
The two-speed braking electric motor M will start smoothly without any shock.

When the short time set in timer T (for example, 0.1 to 0.2 seconds) has elapsed, timer T operates and its normally closed contact T-1
opens, and as a result, the reverse phase braking relay R becomes inoperable and its normally open contact R-1 is opened, so the reverse phase current supplied to the small polarity stator winding of the two-speed braking motor M is cut off. Then, the two-speed braking motor M rotates at a low speed with the anti-phase braking being released.

In this state, when the winding pushbutton switch FBI is pressed to the second stage, the normally open contact FBI-1 and the normally open contact FBI
-2 is also closed, and high-speed relay MC4 operates, closing its normally open contact MC4-1 and opening its normally closed contact MC4-2. As a result, the two-speed braking motor M is connected to the power supplies U, V, and W.
Current is completely supplied to the small polarity stator winding of , and the two-speed braking motor M rotates at high speed. At the same time, the normally closed contact MC
By opening 4-2, the low speed relay MC3 becomes inoperable and its normally open contact MC3-1 is opened, thereby cutting off the current in the multipolar stator winding.

When the hoisting pushbutton switch FBI is moved from the second stage to the first stage, its normally open contact FBI-2 opens, so the high-speed relay MC4 becomes inoperable, and at the same time as its normally open contact MC4-1 opens. Close normally closed contact MC4-2. As a result, the current in the small polarity stator winding of the two-speed braking motor M is cut off, and at the same time, the normally closed contact MC4-2 closes.
Since the low speed loop MC3 is activated and closes its normally open contact MC3-1, current is supplied to the multipolar stator winding of the two-speed braking motor M, causing it to rotate at a low speed.

Next, in the case of lowering operation, press the lowering push button switch PB.
When 2 is pressed to the first stage, the normally open contact PB2-1 closes and the normally closed contact PB2-3 opens. As a result, lowering relay MC2 operates, and its normally open contacts MC2-1 and MC
Close 2-2.

By closing the normally open contact MC2-2, the low speed loop M
C3 operates and closes its normally open contact MC3-1. As a result, current is supplied from the power sources U, V, and W to the low-speed multipolar stator winding of the two-speed braking motor M. At the same time, the normally open contact MC2-2 closes, causing the timer T
operates and the reverse phase braking relay R is operated for a short time until its normally closed contact opens, and its normally open contact R-1 closes. As a result, the high-speed small-polarity stator winding of the two-speed braking motor M is supplied with a current having a phase opposite to the current supplied to the multi-polar stator winding.

Since current can be supplied to the small-polarity stator winding and the multi-polarity stator winding at the same time, the magnetic field for releasing the brake is large, as described above, and the two-speed braking motor M is in a state where anti-phase braking is applied. Therefore, similarly to the above hoisting, the two-speed braking motor M starts smoothly without any shock.

When the short time set in timer T has elapsed and timer T operates, its normally closed contact T-1 opens and reverse phase braking relay R
becomes inoperative and its normally open contact R-1 opens, so that the reverse phase 1 supplied to the small polarity stator winding of the two-speed braking motor M
! The flow is completely blocked, and the two-speed brake electric motor rotates at a low speed with anti-phase braking released.

In this state, when the lowering pushbutton switch PB2 is pressed to the second stage, the normally open contact PB2-1 and the normally open contact FBI
-2 is also closed, and high-speed relay MC4 operates, closing its normally open contact MC4-1 and opening its normally closed contact MC4-2. As a result, the two-speed braking motor M is connected to the power supplies U, V, and W.
Current is supplied to the small polarity stator winding of M, and the two-speed braking motor M rotates at high speed. At the same time, the normally closed contact MC
By opening 4-2, the low speed relay MC3 becomes inoperable and its normally open contact MC3-1 is opened, thereby cutting off the current in the multipolar stator winding.

When the lowering pushbutton switch FB2 is moved from the second stage to the first stage, its normally open contact PB2-2 opens, so the high-speed relay MC4 becomes inoperable, and at the same time as its normally open contact MC4-1 opens. Close normally closed contact MC4-2. As a result, the current in the small polarity stator winding of the two-speed braking motor M is cut off, and at the same time, the normally closed contact MC4-2 closes.
Since the low speed loop MC3 is activated and closes its normally open contact MC3-1, current is supplied to the multipolar stator winding of the two-speed braking motor M, causing it to rotate at a low speed.

In the figure, SWl is a limit switch for preventing upper winding, SW2 is a limit switch for preventing lower winding, and NR is a reverse rotation prevention relay.

〔Effect of the invention〕

As explained above, according to the present invention, a current of 1 is supplied to the multipolar stator winding at startup, and a current of 1 is temporarily supplied to the small polarity stator winding. Since the device is equipped with a control means for supplying current of opposite phase, the following excellent effects can be obtained.

(1) Since the braking motor is in a reverse phase braking state at startup,
Shock will no longer occur during startup.

(2) Also, at startup, current is supplied to the small-polarity stator winding at the same time as the multi-polar stator winding, so it is possible to obtain a large magnetic field to release the braking, resulting in a low high-speed ratio. It becomes possible to increase the

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of an operation control device for a braking motor according to the present invention. In the diagram, M...2 fastest braking motor, MCI...hoisting relay, MC2...lowering relay, MC3...
...Low speed relay, MC4...High speed relay, PB
L...Pushbutton switch for hoisting, PB2...Pushbutton switch for lowering, T...Timer, R...
Relay for reverse phase braking

Claims (1)

[Scope of Claim] In an operation control device for a braking motor, which includes a cylindrical cage rotor, a multipolar stator winding, a small-polar stator winding, and a brake that is released by a magnetic field generated by an armature current. , control for supplying current to the multipolar stator winding at startup, and temporarily supplying a current to the small polarity stator winding with a current opposite in phase to the current supplied to the multipolar stator winding; 1. An operation control device for a braking motor, characterized in that a means is provided.