CN205122408U - High voltage circuit breaker moves winding formula and becomes air gap permanent magnetism linear electric motor operating mechanism - Google Patents

Abstract

The utility model discloses a moving winding variable air gap permanent magnet linear motor operating mechanism of a high-voltage circuit breaker, which solves the problem that the existing high-voltage circuit breaker operating mechanism has many moving parts, complex transmission mechanism, controllability and reliability of the mechanism. problem of poor sex. The middle part including the V-shaped swing rod (4) is hinged on the support shaft (5), one end of the V-shaped swing rod (4) is hinged with the output shaft (3) of the permanent magnet linear motor (1), and the V-shaped swing rod The other end of (4) is hinged with the lower end of the transmission connecting rod (6), the upper end of the transmission connecting rod (6) is connected with the lower end of the insulating rod (8) through the insulating rod connector (7), and the insulating rod ( The upper end of 8) is connected with the lower end of the contact spring (10) through the contact spring connector (9) of the circuit breaker, and the upper end of the contact spring (10) is connected with the moving contact ( 12) Connect together. The reliability of the operating mechanism and the closing operation of the circuit breaker is improved.

Description

High voltage circuit breaker moving winding variable air gap permanent magnet linear motor operating mechanism

technical field

The invention belongs to the technical field of power transmission and transformation equipment, and in particular relates to an operating mechanism of a moving-winding variable-air-gap permanent-magnet linear motor applied to a high-voltage circuit breaker.

Background technique

Permanent magnet linear motors are generally used in linear drive environments. Most of the structures use armature windings placed on the primary iron core and permanent magnets placed on the secondary iron core. Due to the rapid rotation of the motor, the secondary iron core of this layout and the motor The shell is prone to collision, and the permanent magnet on the secondary core will be demagnetized due to strong collision, thus affecting the linear motion of the motor. Therefore, let the armature winding move, and the permanent magnet static linear motor can solve the problem of demagnetization of the permanent magnet due to collision. The air gap between the primary core and the secondary core of a conventional motor is a constant value, and the air gap flux density is also a constant value. The larger the air gap, the smaller the flux density, and the smaller the air gap, the greater the flux density. The linear motion speed of the secondary iron core of the motor is related to the electromagnetic thrust of the motor, and the electromagnetic thrust is proportional to the armature winding current and the air gap flux density. When the air gap is constant, the linear motion speed of the motor can be controlled by controlling the armature winding current, and the control of the armature winding current is realized by the controller. When the linear motor is used to control the moving contact of the high-voltage circuit breaker to perform opening and closing operations, since the opening or closing speed of the moving contact of the high-voltage circuit breaker is firstly slow, then fast, and finally slow, this requires the armature winding The current realizes segmental control. However, due to the higher requirements for the opening or closing speed of the high-voltage circuit breaker, the current of the armature winding reaches 200-300 amperes. At this time, it is difficult to realize the segmental control of the current, and it also reduces the life of the armature winding and the reliability of the controller. sex. Therefore, the permanent magnet linear motor with a constant air gap is not feasible during the opening and closing operation of the high voltage circuit breaker, and cannot meet the opening or closing speed requirements of the high voltage circuit breaker. The high-voltage circuit breaker is an extremely important power device in the power system. Its operation directly affects the stability and reliability of the entire system, and the operating mechanism of the high-voltage circuit breaker is an important part of it. It not only ensures the circuit breaker The long-term action reliability of the device must be met, and the requirements of the arc extinguishing characteristics for the operating mechanism must be met. Traditional circuit breaker operating mechanisms are mainly electromagnetic operating mechanisms, spring operating mechanisms, pneumatic operating mechanisms and hydraulic operating mechanisms. These operating mechanisms have complex structures, many moving parts, high failure rates, and most of them are in key parts It is easy to cause problems such as operation errors. The complex operating mechanism leads to long response time and large dispersion of the operating mechanism, and its structure cannot fully meet the kinematic and operating characteristics of the circuit breaker, thus failing to meet the requirements of the modern power system for the intelligent operation of the circuit breaker.

Contents of the invention

The present invention provides a moving-winding variable air-gap permanent magnet linear motor operating mechanism for a high-voltage circuit breaker, which solves the problem that the existing high-voltage circuit breaker operating mechanism has many moving parts, complex transmission mechanism, poor controllability and reliability of the mechanism. technical problems.

The present invention solves the above technical problems through the following technical solutions:

A high-voltage circuit breaker moving winding variable air gap permanent magnet linear motor operating mechanism, including a permanent magnet linear motor, a motor controller, a circuit breaker arc extinguishing chamber and a supporting shaft, and a moving contact is arranged in the circuit breaker arc extinguishing chamber And the static contact, the motor controller and the permanent magnet linear motor are electrically connected together, the middle part of the V-shaped swing rod is hinged on the support shaft, and one end of the V-shaped swing rod is hinged with the output shaft of the permanent magnet linear motor. The other end of the swing rod is hinged with the lower end of the transmission link, the upper end of the transmission link is connected with the lower end of the insulation pull rod through the connector of the insulation pull rod, and the upper end of the insulation pull rod is connected with the contact spring joint of the circuit breaker. The lower ends are connected together, and the upper ends of the contact springs are connected with the moving contacts in the arc extinguishing chamber of the circuit breaker.

On the primary iron core in the permanent magnet linear motor, a first permanent magnet ring, a second permanent magnet ring and a third permanent magnet ring are sequentially arranged along the horizontal direction from left to right, and between the first permanent magnet ring and the second permanent magnet ring A first non-magnetic spacer ring is set between the magnet rings, a second non-magnetic spacer ring is set between the second permanent magnet ring and the third permanent magnet ring, and the first permanent magnet ring and the electric pole on the secondary core The gap between the armature windings is 3.5 mm, the gap between the second permanent magnet ring and the armature winding on the secondary core is 0.5 mm, the gap between the third permanent magnet ring and the armature winding on the secondary core 2 mm, a left auxiliary permanent magnet ring is arranged on the left outer surface of the primary iron core, a right auxiliary permanent magnet ring is arranged on the right outer surface of the primary iron core; a Huo Er position sensor.

The moving-winding variable-air-gap permanent-magnet linear motor operating mechanism of the high-voltage circuit breaker proposed by the present invention simplifies the motion driving part in the traditional operating mechanism into the motor shaft rotating by the only component, which greatly reduces the zero cost of the operating mechanism. Components improve the reliability of the operating mechanism. The circuit breaker is driven by a linear motor, which has simple structure, fast speed response and good controllability in the motion process. According to the speed characteristic requirement of the high voltage circuit breaker, the permanent magnet linear motor proposed by the present invention adopts a moving winding variable air gap structure, so that the motion performance of the permanent magnet linear motor matches the speed characteristic of the high voltage circuit breaker. On the one hand, this structure improves the starting electromagnetic thrust of the permanent magnet linear motor, produces greater acceleration, and can realize fast action and rapid braking; on the other hand, it reduces the mechanical impact on the operating mechanism and increases the high voltage circuit break The mechanical life of the device and the operating mechanism. The invention proposes to directly use the electromagnetic attraction generated by the auxiliary permanent magnet to maintain the high-voltage circuit breaker at the opening and closing position, which has simple structure and reliable performance, effectively avoids the closing bounce of the circuit breaker, and improves the operation Reliability of mechanism and circuit breaker closing operation. Because the movement time of the high-voltage circuit breaker is short and the speed is fast, in order to prevent the loss of magnetism caused by the collision of the permanent magnet during the movement, the present invention proposes a moving winding type variable air gap permanent magnet linear motor structure, that is, the winding is placed on the moving secondary iron core , the permanent magnets are placed on the stationary primary core.

Description of drawings

Fig. 1 is the overall structure schematic diagram of the present invention;

FIG. 2 is a schematic structural view of the permanent magnet linear motor 1 of the present invention.

detailed description

The present invention is described in detail below in conjunction with accompanying drawing:

A high-voltage circuit breaker moving winding variable air gap permanent magnet linear motor operating mechanism, including a permanent magnet linear motor 1, a motor controller 2, a circuit breaker arc extinguishing chamber 11 and a support shaft 5, in the circuit breaker arc extinguishing chamber 11 A moving contact 12 and a static contact 13 are provided, and the motor controller 2 is electrically connected with the permanent magnet linear motor 1. It is characterized in that the middle part of the V-shaped swing link 4 is hinged on the support shaft 5, and the V-shaped swing link 4 One end of the V-shaped swing link 4 is hinged with the output shaft 3 of the permanent magnet linear motor 1, and the other end of the V-shaped swing link 4 is hinged with the lower end of the transmission link 6. The lower ends of 8 are connected together, the upper end of insulating rod 8 is connected with the lower end of contact spring 10 through circuit breaker contact spring joint 9, and the upper end of contact spring 10 is connected with the moving contact 12 in circuit breaker arc extinguishing chamber 11 connected.

On the primary iron core 14 in the permanent magnet linear motor 1, a first permanent magnet ring 17, a second permanent magnet ring 18 and a third permanent magnet ring 19 are arranged successively along the horizontal direction from left to right. Between the ring 17 and the second permanent magnet ring 18, a first non-magnetic spacer ring 20 is arranged, and a second non-magnetic spacer ring 21 is arranged between the second permanent magnet ring 18 and the third permanent magnet ring 19. The gap δ ₁ between a permanent magnet ring 17 and the armature winding 16 on the secondary iron core 15 is 3.5 millimeters, and the gap δ ₂ between the second permanent magnet ring 18 and the armature winding 16 on the secondary iron core 15 is 0.5 millimeters, the gap δ ₃ between the third permanent magnet ring 19 and the armature winding 16 on the secondary core 15 is 2 millimeters, and the left auxiliary permanent magnet ring 22 is arranged on the left outer surface of the primary core 14, on the primary A right auxiliary permanent magnet ring 23 is arranged on the right outer surface of the iron core 14 ; a Hall position sensor 24 is sleeved on the left end of the output spindle of the permanent magnet linear motor 1 .

The primary iron core 14 and the secondary iron core 15 are made of DW470 silicon steel sheets. The output shaft 3 of the motor is forged from No. 10 steel. The models of the first permanent magnet ring 17, the second permanent magnet ring 18 and the third permanent magnet ring 19 are all It is N38 type NdFeB permanent magnet. When the secondary iron core 15 moves to the closing or opening position of the circuit breaker, that is, when it is displaced to the far left or right, the left auxiliary permanent magnet ring 22 and the right auxiliary permanent magnet ring 23 are passed through using the principle of the shortest path of magnetic flux. The generated permanent magnetic attraction makes the secondary iron core 15 and the primary iron core 14 attract together, ensuring that the circuit breaker moves within a specified range and maintains at the opening and closing position.

The gap δ1 between the first permanent magnet ring 17 in the permanent magnet linear motor ₁ and the armature winding 16 on the secondary iron core 15 is 3.5 millimeters, the second permanent magnet ring 18 and the armature winding on the secondary iron core 15 The gap δ ₂ between 16 is 0.5 mm, and the gap δ ₃ between the third permanent magnet ring 19 and the armature winding 16 on the secondary core 15 is 2 mm. This variable air gap structure corresponds to the opening movement process of the circuit breaker. In the contact stroke stage, the air gap length is small. In this embodiment, the air gap length is 2 mm, so that the air gap magnetic density is relatively large. , resulting in a larger electromagnetic torque provided by the driving motor, so that the circuit breaker can obtain a larger initial speed; in the 3/4 opening stage after the circuit breaker is just opened, the air gap length is the smallest, which is 0.5mm. The electromagnetic torque provided by the driving motor under the length is the largest, which can achieve the fastest average opening speed to meet the speed characteristic requirements of the circuit breaker; the distance before the opening position is 1/4, and the maximum air gap length is 3.5mm, making The output torque of the motor is reduced, which is beneficial to reduce the mechanical impact on the motor and circuit breaker. The variable air gap structure ensures that the drive motor matches the speed characteristics of the circuit breaker structurally.

Claims (2)

1. a primary cut-out moves winding type change air gap permanent magnet linear electric motor operation mechanism, comprise permanent-magnetism linear motor (1), electric machine controller (2), arc-extinguishing chamber of circuit breaker (11) and back shaft (5), moving contact (12) and fixed contact (13) is provided with in arc-extinguishing chamber of circuit breaker (11), electric machine controller (2) and permanent-magnetism linear motor (1) are electrically connected, it is characterized in that, the middle part of V-arrangement fork (4) is hinged on back shaft (5), one end of V-arrangement fork (4) and the output shaft (3) of permanent-magnetism linear motor (1) hinged, the other end of V-arrangement fork (4) and the lower end of kinematic link (6) hinged, the upper end of kinematic link (6) is linked together by the lower end of insulated tension pole connector (7) with insulated tension pole (8), the upper end of insulated tension pole (8) is linked together by the lower end of contact of breaker spring joint (9) with touch spring (10), moving contact (12) in the upper end of touch spring (10) and arc-extinguishing chamber of circuit breaker (11) links together.

2. a kind of primary cut-out according to claim 1 moves winding type change air gap permanent magnet linear electric motor operation mechanism, it is characterized in that, on elementary iron core (14) in permanent-magnetism linear motor (1), the first magnet ring (17) is disposed with along horizontal direction from left to right, second magnet ring (18) and the 3rd magnet ring (19), the first non-magnetic spacer ring (20) is provided with between the first magnet ring (17) and the second magnet ring (18), the second non-magnetic spacer ring (21) is provided with between the second magnet ring (18) and the 3rd magnet ring (19), gap (δ between armature winding (16) in first magnet ring (17) and secondary iron core (15) ₁) be 3.5 millimeters, the gap (δ between the armature winding (16) in the second magnet ring (18) and secondary iron core (15) ₂) be 0.5 millimeter, the gap (δ between the armature winding (16) in the 3rd magnet ring (19) and secondary iron core (15) ₃) be 2 millimeters, the left outside side of elementary iron core (14) is provided with left redundant magnet ring (22), the right outside side of elementary iron core (14) is provided with right redundant magnet ring (23), hall position sensor (24) is socketed with at the left end of the output main shaft of permanent-magnetism linear motor (1).