CN201430421Y

CN201430421Y - Three-phase asynchronous motor open-phase protector

Info

Publication number: CN201430421Y
Application number: CN2009203052430U
Authority: CN
Inventors: 耿成达
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-06-29
Filing date: 2009-06-29
Publication date: 2010-03-24
Anticipated expiration: 2019-06-29

Abstract

The utility model discloses a three-phase asynchronous motor open-phase protector, wherein three groups of iron cores with the same structures and three groups of same working joints are arranged in aprotector casing, the iron cores comprise dynamic iron cores and static iron cores, one ends of the iron cores are connected together by a hinge, a coil framework is sleeved on the central columns ofthe iron cores, the coil and a power cord of a motor are connected in series, and the working joints and the self-locking loop of a contactor are connected in series. The three-phase asynchronous motor open-phase protector directly utilizes working current of a motor to absorb the iron cores through magnetic force generated by the coils of the protector, and leads the interlocking working jointsto be closed, and the three groups of joints are connected in the self-locking loop of the contactor after being connected in series. When the motor is lack of phase, electric current does not existsin the phase wire, the iron cores of the protector lose magnetism, the dynamic and the static iron cores are released under the pushing of an inversed pushing spring, the working joints are triggeredto disconnect, the coil of the contactor loses the self-locking current releasing, the motor is disconnected, thereby protecting the motor. The iron cores of the three-phase asynchronous motor open-phase protector have extremely less action resistance, and lower ampere-turns current can work. The three-phase asynchronous motor open-phase protector is not influenced by the variation of a power supply and a load, and has strong overload capacity. The three-phase asynchronous motor open-phase protector has simple and applicable structure, smart appearance, long mechanical service span and low cost.

Description

The threephase asynchronous phase failure protector

Technical field

The utility model relates to a kind of phase failure protector of threephase asynchronous.

Background technology

Threephase asynchronous is in operation as if having a phase power supply to break down or breaking, and promptly causes phase-deficient operation, will burn winding, and the circuit inter-burnout-ing rate reaches more than 75 percent.There is complex structure in existing phase failure protector, and the cost height is safeguarded the shortcoming of inconvenience, so can not wide popularization and application.

The utility model content

It is a kind of simple in structure that the purpose of this utility model is to provide, and cost is low, after the motor phase failure, and the threephase asynchronous phase failure protector that the protection motor is not burnt.

Technical solutions of the utility model are: the threephase asynchronous phase failure protector, comprise a housing, three groups of iron cores and operating contact are set in the housing, iron core is formed " day " font by structure identical moving iron core and static iron core two parts, one end is linked together by hinge, be provided with certain interval between the upper and lower newel of moving iron core and static iron core, be wound with on the newel that the skeleton of coil is sleeved on, coil is provided with binding post, one end of moving iron core is provided with the anti-spring that pushes away and contacts with coil rack, and both sides stem stem end face studs with the short circuit copper ring; Moving iron core top is provided with a pair of operating contact, and fixed juncture is arranged on the dividing plate upper end, and corresponding with it movable contact is arranged on the shell fragment of bearing, and shell fragment is provided with the insulation support arm, and fixed juncture and shell fragment are respectively equipped with binding post.

The use that matches of the utility model threephase asynchronous phase failure protector and contactor; be provided with three groups of " day " font iron cores and three groups of identical operating contacts that structure is identical in the housing; coil rack is sleeved on the core center post; coil is connected in series with the power line of motor, and operating contact is connected in series mutually with the contactor self-locking circuit.During the no phase failure, iron core adhesive, junction closure, contactor self-locking circuit connection work.When the phase failure occurring, iron core is opened, and the contact that pushes the work forward is opened the control contactor outage.The moving iron core of the utility model adopts hinge to be connected with static iron core, makes iron core action resistance minimum, and very low ampere-turn electric current gets final product work.The utility model is not subjected to power supply, the influence of load variations, and overload capacity is strong.Not consuming electric power is without external power supply.The utility model is simple in structure to be suitable for, and external form is small and exquisite, and mechanical endurance is long, and cost is low.Do not need frequent maintenance, reliable, be fit to normal phase work, as long as the environment that contactor is fit to, this device just can reliability service.The core dimensions of same specification adopts the different conductor cross-sections and the number of turn can be suitable for the motor of multiple power.

Description of drawings

Fig. 1 is the utility model threephase asynchronous phase failure protector release condition figure;

Fig. 2 is the utility model threephase asynchronous phase failure protector attracting state figure.

Embodiment

As shown in the figure, the threephase asynchronous phase failure protector comprises a housing 1; three groups of iron cores and operating contact are set in the housing; iron core is formed " day " font by structure identical moving iron core 7 and static iron core 9 two parts, and an end is linked together by hinge 8, and the folding of iron core is the axle center with the hinge.Be provided with certain interval 14 between the upper and lower newel of moving iron core and static iron core, conveniently move separating of iron core and static iron core.Be wound with on the newel that the skeleton 10 of coil 12 is sleeved on, coil is provided with binding post and contacts mutually with the main contact of contactor.One end of moving iron core is provided with the anti-spring 13 that pushes away and contacts with coil rack 10, and both sides stem stem end face studs with short circuit copper ring 11; Moving iron core top is provided with a pair of operating contact, fixed juncture 15 is arranged on dividing plate 6 upper ends, and corresponding with it movable contact 3 is arranged on the shell fragment 4 of bearing 5, and shell fragment is provided with insulation support arm 2, fixed juncture and shell fragment are respectively equipped with binding post, and binding post is connected in series mutually with the contactor self-locking circuit.The folk prescription that wherein two group normal opened contacts are fit to motor is to various startup requirements such as, twocoueses.

The magnetic force that this device directly utilizes the motor operating current to produce by the protector coil is inhaled moving iron core adhesive; make the operating contact closure of its interlock, after three groups of series connection of this contact, be serially connected in again in the self-locking circuit of contactor; make the self-locking of contactor self-holding contact, machine operation.When the motor phase shortage; there is not electric current in this phase conductor; protector iron core loss of excitation; dynamic and static iron core is thrown off under the anti-promotion that pushes away spring, and moving iron core promotes the insulation support arm, and touches operating contact and become off-state by closed conducting state; contactor coil loses latching current and discharges; the motor outage, thus motor protected, if trip point is not repaired the utility model and can not be started once more.

Claims

A kind of threephase asynchronous phase failure protector, comprise a housing (1), it is characterized in that: three groups of iron cores and operating contact are set in the housing, iron core is formed " day " font by structure identical moving iron core (7) and static iron core (9) two parts, one end is linked together by hinge (8), on moving iron core and the static iron core, be provided with certain interval (14) between the following newel, be wound with on the newel that the skeleton (10) of coil (12) is sleeved on, coil is provided with binding post, one end of moving iron core is provided with the anti-spring (13) that pushes away and contacts with coil rack (10), and both sides stem stem end face studs with short circuit copper ring (11); Moving iron core top is provided with a pair of operating contact, and fixed juncture (15) is arranged on dividing plate (6) upper end, and corresponding with it movable contact is arranged on the shell fragment (4) of bearing (5), and shell fragment is provided with insulation support arm (2), and fixed juncture and shell fragment are respectively equipped with binding post.