CN2421776Y

CN2421776Y - Brushless non-ring soft starting speed variator for wound-rotor motor

Info

Publication number: CN2421776Y
Application number: CN 00224535
Authority: CN
Inventors: 喻扬
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-04-04
Filing date: 2000-04-04
Publication date: 2001-02-28
Anticipated expiration: 2010-04-04

Abstract

The utility model discloses a brushless soft non-ring starting speed regulating device for wound rotor motors, composed of voltage regulation, etc. circuit part and thyristor circuit part, wherein, the voltage regulation, etc. circuit part is arranged at the external of the motors; the thyristor circuit part synchronously rotate following a rotating shaft. The utility model is characterized in that a first coil (2< 1 >) of a rotary transformer is fixed with a casing, and a secondary coil (2< 2 >) is arranged on the rotating shaft; a thermistor (7) is connected in series in a control circuit. The utility model is made into a whole with the motors, the utility model discards original collecting rings of the motor, and does not need any additional facilities which are matched with the motor. The utility model has the advantages that the utility model simplifies the operating program, and saves large quantity cost. The utility model has the advantages of reliable capability, less investment, and obvious effect.

Description

Wound rotor motor is brushless acyclic soft start speed device

The utility model relate in the electric field speed regulating device, particularly non-carbonate soft starting electronic speed regulating device of the absence of collector of wound rotor three-phase asynchronous motor.

Wound rotor three-phase asynchronous motor is applied to crane and metallurgy industry, makes the power source of level and smooth soft start, velocity transformation plant equipment.For reaching practical effect, people are with frequency sensitive trheostat and rotor coil and connect, and adopt the method that changes rotor frequency, reach the purpose of soft start.The plate shape resistor and the rotor coil that will have tap join, and the output impedance that changes the motor rotor coil reaches the purpose of speed governing.During actual the use, in the soft start operational mode, motor must dispose the frequency sensitive trheostat of equivalent weight and volume, and promptly heaviness needs a large amount of copper-steel material manufacturings again, also will provide special place to shelve.In the velocity transformation operational mode, must owing to be that on-load switches, cause contact often to be ablated, and used resistor be to be formed by the resistance wire coiling with the tap of manual drum controller convert resistance device, often appearance heat be disconnected, corrosion.In above-mentioned two kinds of operational modes; electric energy in the rotor coil is carried out turnery by three collector rings in the rotating shaft with the carbon brush on being fixed on casing and is contacted transmission; such structure; can cause the wearing and tearing of collector ring and carbon brush; and copper end that the friction back produces and carbon powder can make the motor windings insulation reduce; like this, the user must often change carbon brush and cleaning motor windings, increases added burden to the user undoubtedly.(patent No. (982245157) only has single soft start function to the brushless acyclic starter that available data is introduced, and the speed of can not carrying out is regulated arbitrarily, and the scope of application is limited to.

It is metallurgical with wound rotor three-phase asynchronous motor absence of collector, non-carbonate smoothly soft start that the purpose of this utility model provides a kind of crane, again the device of governing speed arbitrarily.

For reaching above-mentioned purpose, the utility model replaces collector ring on the machine shaft by the resolver of the secondary coil of static primary coil and rotation and iron core combination; Carry out the variable conversion that controls signal to silicon controlled trigger signal with the photoresistance coupler, realize electrical isolation simultaneously; With single-phase silicon-controlled power consumption element as rotor coil; Be serially connected in the resolver primary coil loops with gradation type subzero temperature thermistor, realize soft start function.

After adopting such structure,, replaced traditional collector ring, promptly do not needed often to change carbon brush and clean motor windings, prolonged motor useful life again owing to adopt resolver to carry out the conversion and the magnetic coupling of forceful electric power and light current.Owing to adopt the photoresistance coupler as electrical isolation and the conversion and the single-phase silicon-controlled power consumption element as rotor coil that control signal to triggering signal, desirable any additional facilities of losing motor configurations will be saved substantial contribution, reduce operation sequence again.Winding rotor motor is become carry the advanced power equipment of soft start, speed regulating device.

The utility model is described in further detail below in conjunction with specification drawings and specific embodiments:

Accompanying drawing is the utility model electrical diagram:

Shown in the accompanying drawing, should form by being installed in the control circuit 9 on the body and being installed in controllable silicon drive circuit 10 two large divisions that rotate synchronously with rotating shaft on the machine shaft with novel.

Control power supply A, B are taken from the two-phase power supply on the motor wiring post.Change over switch 8 is invested a end, and this device possesses speed regulation function, invests the b end, possesses soft start function.Subzero temperature thermistor 7 with " cold disconnected heat logical " performance is with voltage regulator circuit 1 and connect.The primary coil that has iron core 2 of resolver 2 ₁Be fixed on the motor case, have the secondary coil 2 of iron core ₂Be installed on the machine shaft.The effect of this resolver is to replace traditional collector ring.The variable direct current signal of rectification circuit 3 outputs adds the input of photoresistance coupler 4, this photoresistance coupler carries out electrical isolation with the high voltage that has in the control signal of outside and the rotor, and it can join with the strong and weak control utmost point that changes resistance and output and Group of Silicon Controlled Rectifier 5 of front-end control signal.Three the end of a thread of the output of Group of Silicon Controlled Rectifier 5 and motor-spin-coil 6 join.Change the silicon controlled angle of flow, just can change the end resistance of rotor coil, thereby reach the speed governing purpose.

The utility model simple structure, dependable performance are implemented easily.

Claims

1, a kind of wound rotor three-phase asynchronous motor soft start speed device, by being installed in the outer voltage-regulation of machine, soft starting circuit and the interior rectification circuit that rotates synchronously with rotating shaft of the machine that is installed in, the photoresistance coupler, Group of Silicon Controlled Rectifier two large divisions forms, working power is taken from the two-phase power supply on the motor binding post, the control signal of voltage-regulation and soft start output, through voltage transformation, add the photoresistance coupler after the rectification and carry out signal and impedance conversion, the silicon controlled input is connected on the load end of photoresistance coupler, three the end of a thread and the silicon controlled output of rotor coil join, voltage-regulation outside machine, between the rectification circuit in soft starting circuit and the machine magnetic induction setting is set, purpose is to get to lose motor collecting ring, it is characterized in that: described magnetic-inductive device is resolver (2).

2, soft start speed device according to claim 1 is characterized in that: described resolver (2) is made up of the primary coil that has iron core (21) and two parts that the secondary coil that has iron core (22) can separate.

3, soft start speed device according to claim 1 and 2 is characterized in that: the described primary coil (21) that has iron core is fixed on the motor case; The secondary coil (22) that has iron core is installed on the machine shaft.

4, soft start speed device according to claim 1 is characterized in that: at the two ends of voltage regulator circuit (1) and connect a thermistor (7).

5, according to claim 1 or 4 described soft start speed devices, it is characterized in that: described thermistor (7) is the subzero temperature thermistor.

6, according to claim 1 or 4 or 5 described soft start speed devices, it is characterized in that: described subzero temperature thermistor is a gradation type subzero temperature thermistor.