JPS5944998A - Protecting device for hysteresis motor group - Google Patents

Abstract

PURPOSE:To eliminate the adverse influence of heat generated in a motor to a load at the defect protecting time by classifying the load groups driven by the motor groups into thermally stable loads and thermally unstable loads. CONSTITUTION:Hysteresis motor groups 1-1-1-n, 2-1-2-n which drive thermally stable load groups 6-1-6-n, 7-1-7-n are respectively commonly connected through switches 11-1-11-n, 14-1-14-n. A group shortcircuit type which is connected simultaneously to a power source feeder 13 through corresponding one protecting breakers 12, 15 is employed, and hysteresis motors 3, 4, 5 which drive thermally unstable loads 8, 9, 10 respectively employ individual shortcircuit protecting type which are connected to a power source feeder 13 through switches 16, 17, 18 and protecting breakers 19, 20, 21.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention is a thermal (bistable Vζ deer, IIS 11!!
This invention relates to a protection device for a group of hysteresis motors that electrically power a load that requires the same operation as a load and a load that may be operated under normal conditions.

[Technical background A of the invention (problems with it)]

The journey of hysteresis starts from the rotating magnetic field (-therefore, the hysteresis loss that occurs in the hysteresis ring, and it rotates synchronously, producing torque at the beginning, torque at the synchronous speed (21llle movement is small, and rotation Because of its smoothness, it is used as a feed motor for noise, N+, inkstone tape, measuring cutters, etc., or as a commercial speed rotation bot motor. Am j111'J~ru shell <Ur(yo, 藺(two weakly thermal (bistable state I lick), 5
The one that is necessary and the one that is +ii + d thermal and thermal (two shadows - criticize the one that does not catch the horse mackerel.Moreover, there are many hysteresis balls rA machine details that control both of these loads.
1 JJ may be repeated.

These hysteresis - 'A' + M t, the number of short circuits of 1 fixed electric sea bream 1・ψ, etc. are used as a conjunctive force formula. Open the door and connect to the feeder via the J device and breaker.
,'l-individual projection system and multiple hysteresis units!
A group short-circuit protection type is adopted in which the group is commonly connected through a 1W enclosure, and this group is connected to a feeder (2) through one 11F enclosure.However, the former individual short-circuit method In this case, each electric motor is equipped with a knee switch and a breaker, and as the number of electric motors increases, the cost of short-circuit protection equipment such as switches and circuit breakers increases. In this method, the following occurs because the performance of the load itself may be degraded.

In other words, in the group short-circuit method, multiple hysteresis motors are collectively protected from short-circuiting by one circuit breaker, so that when a group of motors is in operation (- if any one hysteresis motor causes a short-circuit accident, , of course, the circuit breaker that is connected to the valley motor opens. When this circuit breaker opens, the healthy hysteresis motor is also disconnected from the power supply at the same time. Normally, this healthy In order to continue the operation of the Ryu kMJ Iso, immediately after discovering the faulty hysteresis motor (open the knee breaker to remove it from the group, and then re-close the breaker that was open).

At the time when the breaker is turned on again, the circuit breaker is in an asynchronous state due to the healthy valley hysteresis. ,・Healthy valley pressure 7s'ton! #Synchronized operation after Iso is re-introduced (power low speed period until 1 (2,
The hysteresis motor generates a large amount of heat compared to the same operation (2).Therefore, in the group short circuit method, the hysteresis 7 cAJja itself is not problematic, but the main motor group is thermal (2). If you are driving a weak load, secondary problems such as the load's performance being degraded by the heat generated by the engine will occur.

[Purpose of the invention]

The object of the present invention is to provide a protection device for a hysteresis power transmission group (1) which prevents the heat generated by the motor from having an adverse effect on the load when the motor is activated.

[Summary of the invention]

The present invention divides loads driven by hysteresis and a number of valleys into thermally stable loads and unstable loads. The working group is equipped with group short-circuit protection equipment (2 wires are connected, and the thermally unstable load ta [K working is hysteresis').
This article relates to a protection device for a group of voice aircraft.

[Embodiments of the invention]

The present invention will be described below with reference to the embodiments shown in the drawings.
, 1-2 , 1-n h- and 2-i + 2-
2 + 2-n and one hysteresis voltage @g3,
4.5, motor groups 1-1, 1-2, 1
-n 9 and 2-1°2-2.2-n load 6-1,
6-2, 6-n L- and 71.72, 7n are connected to the thermal (two strongly thermal (bistable) properties, respectively, and the load 8.9.10 of the electric motor 3,4゜5 is The motor plant is constructed by connecting the thermally unstable ones that are sensitive to heat.The input side of the hysteresis motor group 1-1S L-11-n is connected to the switch 11-1, respectively. .
-1.2-2.2-n inputs [11 are connected to a common terminal via switches 14-1.14-2.14-n, respectively;
and J'L through one protective circuit breaker 15. The hysteresis motors 3 and 4.5 drive the switches 16, 17, and 11, respectively.
Power supply feeder 13 (T
-Connection (two screws).

That is, thermally stable load 6-1 + 6-2 + G-n
and 71+72*7n driving 1-hysteresis j6 j4II 931 group i-I T 1-2 + 1
-n and 2-1.2-2.2-n are respectively switch 1
1-1, 11-2, 11-nfu・yo and 14-1,
Common connection 1171 via 14-2, 14-n:
, and the thermally stable load 8,
The hysteresis motors 3 + 4-5 that drive each of the 910 individually are each connected to a switch i6.17.18.
Valve the protective shields 19, 20.21 and turn on σV.
An individual short-circuit protection system connected to the feeder 13 is adopted.

Furthermore, the present invention (hysteresis due to two)
[A group of protection devices (2,] li %, inside the hysteresis car! Sukeiso 1-1 is 9 beans small each month 1 and 2
Wake up/do this. This short circuit accident is detected by a fault detection relay (not shown) and the direct protection circuit breaker 12 is opened. This opening of the breaker 12 naturally also disconnects the healthy hysteresis motors lTi 1-2 . . . ln from the sludge feeder 13 at the same time. Normally, in order to continue the operation of this healthy electric 4-cooker (second), open and close the failed hysteresis motor 1-1, remove it from the group by opening i+1l-1, then open the circuit, and then turn on the circuit breaker 12 again. At the time when the circuit breaker 12 is turned on again, each healthy hysteresis motor 1-2. (There are two people. However, each healthy hysteresis motor 1-2.1-n is turned on (p) and then synchronous operation (
During the acceleration period, the motor itself generates a large amount of heat, raising the ambient temperature.

However, in the present invention, these hysteresis '1
．． lj, dynamic 1zl 2 + 1 n τ(i' J6-2 to 6-n are hot and two strongly thermally stable ones are selected and maintained, so if the ambient temperature If rises. The properties of the negative 4ii'6-2 to 6-n will not be affected in any significant way.

Also, the hysteresis motor 3 that is currently powering the heat-sensitive load 8 is 9! J, the origin of the entanglement, 1...
) Immediately, the circuit breaker 21 opens, and the circuit breaker 16 opens, disconnecting the circuit 3 from the power supply.

After filling the electric motor 3 with 1, the switch 16 is turned on, and the 11J switch is turned on with the puller Hpt switch 19. The same thing happened after the electric motor 3 was turned on again.During the acceleration M at J, which started operation, Even if 8 is thermally unstable, its performance (2 is unnecessary).

〔Effect of the invention〕

As described above, in the present invention (2), hysteresis' motor group (= driven load group) is
The hysteresis group driving the thermally unstable load group is classified into the thermally unstable load group. The hysteresis electric motor group that instigates the hysteresis motor group has a V-circuit protection system (2444), so that each hysteresis 7-stroke motor has a protection action against short-circuit accidents, and the hysteresis motor's In the event of a short circuit accident (Nioke 4'41
The heat generated during the acceleration period from restarting one machine to synchronous operation will no longer have any adverse effects.

[Brief explanation of drawings]

The drawing is a circuit diagram showing an embodiment of a protection device for a hysteresis motor group according to the present invention (2). 1, 2.3.4.5...Hysteresis motor 6.7.
...Thermal stable load 8.9.10...Ship unstable load 11, 14.16.17.18...Switch 12,
15.19.20.21...Protective breaker 13...
′Gigen feeder

Claims (1)

[Claims] (1) Hysteresis tunning 1j1, several B(, (1) The load that is moved to the thermal The hysteresis "E" motive group that bounces the stable load group must protect the troughs that are connected to each other through a switch.
'l+i? The hysteresis group connected to the power supply feeder via Each of them is connected to the power supply feeder through an individual switch, breaker, and leakage breaker. Nil sword (Hikii! 1. No 11 smell is placed.