CN210927369U - Novel low-speed high-torque permanent magnet direct-drive synchronous motor for crusher - Google Patents

Abstract

The utility model discloses a novel low-speed large-torque permanent magnet direct-drive synchronous motor for a crusher, which comprises a motor, a safety coupling and the crusher; wherein the motor comprises motor stator, shell, electric motor rotor, and the stator part comprises motor casing, stator core, stator winding, and electric motor rotor comprises the rotor shaft, rotor core, permanent magnet and baffle, is equipped with fan, characterized by at the tail end of motor: the tail end of the motor rotor is provided with a rotary transformer, the electrical end of the motor is connected with a frequency converter, the input electrical end of the frequency converter is connected with a power supply, and the control mode adopted by the frequency converter is a closed-loop vector control mode; the two motors are connected with the crusher through a safety coupling and are in following relation; the system is used for protecting the crusher and the crusher motor; by utilizing a double protection mechanism, the working mechanism of the crusher and the motor when meeting large resistance is protected; but also can play the role of energy conservation.

Description

Novel low-speed high-torque permanent magnet direct-drive synchronous motor for crusher

Technical Field

The utility model relates to a breaker motor field specifically discloses a novel synchronous motor is directly driven to low-speed big torque permanent magnetism for breaker.

Background

The crusher motor is a driving motor connected to the crusher and drives the bevel gear of the crusher to move so as to crush the ore. The traditional crusher motor has lower efficiency and power factor; when the stones are crushed, the crushing strength and the crushing difficulty are different due to different materials and different sizes, and when the stones are larger, the crushing difficulty is high, so that the problems of locking or damage to bevel gears of the crusher can be caused frequently; therefore, in order to protect the current equipment, a large belt pulley speed reducer and a small belt pulley speed reducer are adopted for speed reduction, namely, a belt transmission mode is adopted, the problems of elastic deformation, friction, gaps, lubrication, noise and the like caused by the mechanical transmission chain are serious, the durability is poor, and the problems of energy consumption, abrasion and the like of a traditional system are directly obvious; and the maintenance and overhaul work of the belt is difficult;

the belt transmission mode is selected to perform overload protection on the system in a slipping mode when the system is subjected to large resistance (the stone is large in size or part of the stone is hard and the like), the overload protection mode is not strictly compliant, although the overload protection mode can be performed in the slipping mode, the belt is damaged, and the slipping mode is unreliable.

In addition, the slipping phenomenon is only the speed reduction of the crusher or the non-operation of the crusher, but the motor of the crusher still works, the working of the motor needs to overcome the friction force of a belt to transfer torque, the energy consumption of the motor can be instantly improved, the waste of energy is serious, and extra burden is added to enterprises; secondly, in the process of skidding, the loss of each structural part is dozens of times of that of normal operation, and the service cycle of the structural part is shortened seriously. Therefore, it is urgently needed to develop a new overload protection system to solve the above problems without affecting normal use.

Disclosure of Invention

The utility model aims at providing a novel low-speed high-torque permanent magnet direct-drive synchronous motor for a crusher, which is used for protecting the crusher and a crusher motor; by utilizing a double protection mechanism, the working mechanism of the crusher and the motor when meeting large resistance is protected; but also can play the role of energy conservation.

A novel low-speed high-torque permanent magnet direct-drive synchronous motor for a crusher comprises a motor, a safety coupling and the crusher; wherein the motor comprises motor stator, shell, electric motor rotor, and the stator part comprises motor casing, stator core, stator winding, and electric motor rotor comprises the rotor shaft, rotor core, permanent magnet and baffle, is equipped with fan, characterized by at the tail end of motor:

the tail end of the motor rotor is provided with a rotary transformer, the electrical end of the motor is connected with a frequency converter, the input electrical end of the frequency converter is connected with a power supply, and the control mode adopted by the frequency converter is a closed-loop vector control mode;

the two motors are connected with the crusher through a safety coupling and are in following relation;

and the torque parameter upper limit of the frequency converter is consistent with the torque parameter upper limit of the safety coupling.

Preferably, the resolver measures the rotation angle and angular velocity of the rotor, and the resolver feeds back the information (motor speed) collected to the frequency converter by the signal processing circuit, and the frequency converter adjusts the motor torque.

Preferably, the safety coupling comprises a steel ball type safety coupling, a steel grit type safety coupling, a hydraulic type safety coupling, a friction type safety coupling and a magnetic powder type safety coupling.

Further, the safety coupling model is serpentine spring in this application.

Furthermore, a proximity switch can be additionally arranged on the safety connecting shaft and is connected with the sound-light alarm system, and when the crusher is overloaded, the proximity switch is closed to trigger the sound-light alarm system to work.

The beneficial effects of the utility model reside in that: the original belt pulley transmission speed reducing device is cancelled, and the frequency converter and the low-speed high-torque permanent magnet synchronous motor are reformed to directly drive the load. Because the vibration caused by impact load is not large, the working condition is very suitable for being transformed into a permanent magnet motor, the control precision, the efficiency, the power factor and the like of the motor can be greatly improved, and the energy-saving effect is particularly obvious; in addition, in equipment requiring large starting torque, a permanent magnet motor with smaller capacity can be used for replacing an induction motor with larger capacity, so that the phenomenon that a trolley is pulled by a large horse is better solved, the investment cost of the equipment is saved, and the running performance of the system is improved; meanwhile, the mode that the frequency converter and the low-speed high-torque permanent magnet synchronous motor directly drive the load is adopted, so that the running condition of a load end can be well controlled, and the safety of the system is improved; in addition, the zero transmission mode can directly provide torque for the actuating mechanism, obviously reduce the energy consumption of the system and directly reduce the maintenance cost of the transmission mechanism. At present, motors and transmission systems applied to enterprises such as power plants, cement plants, metallurgy, mines, steel and the like have the problems of high power consumption, low control precision and the like.

Drawings

Fig. 1 is a schematic view of the transmission of the present application.

Fig. 2 is a front view of the motor body of the present application.

Fig. 3 is a left side view of the motor body of the present application.

Fig. 4 is an electrical schematic of the present application.

In the figure, a motor stator 1, a motor rotor 2, a rotary transformer 3, a fan 4, a motor wiring device 5, a safety coupling 6 and a crusher 7.

Detailed Description

To facilitate understanding and practice of the invention for those skilled in the art, the following detailed description of the invention is provided in connection with the accompanying drawings and the embodiments, it being understood that the embodiments described herein are merely illustrative and explanatory of the invention and are not restrictive thereof.

Referring to fig. 1-4, the present application discloses a novel low-speed high-torque permanent magnet direct-drive synchronous motor for a crusher, which comprises a motor, a safety coupling 6 and a crusher 7; wherein the motor comprises motor stator 1, shell, electric motor rotor 2, and motor stator 1 part is by motor casing, stator core, and stator winding constitutes, and rotor part comprises rotor shaft, rotor core, permanent magnet and baffle, is equipped with fan 4, characterized by at the tail end of motor: the tail end of the motor rotor 2 is provided with a rotary transformer 3 (which can also be an encoder), the electrical end of the motor is connected with a frequency converter, the input electrical end of the frequency converter is connected with a power supply, the frequency converter controls the motor in a closed-loop vector control mode, and meanwhile, the frequency converter is combined with the rotary transformer 3 to acquire information and feed back to adjust, so that the motor has the output characteristic of zero-speed full torque, heavy load starting of large inertia load is realized, when the crusher 7 is started, ore in the crusher 7 does not need to be cleaned, the use is more convenient, the frequency converter is provided with a motor current and torque value display function, and the parameters of the frequency converter can be adjusted; the two motors on the crusher 7 are connected with the crusher 7 through the safety coupling 6, and the two motors are in following relation, and the following relation can strictly control the two motors to synchronously rotate, stop and start at the same time; the upper limit of the torque parameter of the frequency converter is adjusted to be consistent with the upper limit of the torque parameter of the safety coupling 6 (the torque of the safety coupling 6 can be adjusted), once the load exceeds the preset value, the safety coupling 6 can enable the motor to be separated from the crusher 7, so that the umbrella teeth of the crusher 7 are protected from being damaged, the energy consumption of the motor in an effective range is saved, the motor can be protected from bearing the load in the range all the time, and the service life of the motor is prolonged relatively. Meanwhile, because the torque of the safety coupling 6 is consistent with that of the frequency converter, a full-load signal can be fed back by the frequency converter, so that the motor is stopped in time, the energy consumption is reduced, and the protection belongs to electrical protection.

The utility model discloses in, rotary transformer 3 measures the rotation angle and the angular velocity of rotor, and this information is gathered to rotary transformer 3, feeds back motor speed to the converter, and the converter adjusts motor torque in real time according to this signal for it possesses big torque all the time.

The 6 models of safety coupling are serpentine spring in this application, and the displacement separation can take place for two connecting ends after transshipping. According to the characteristic, the proximity switch is arranged at the displacement position and is used as a trigger switch, the proximity switch is connected with the sound-light alarm system, when the crusher 7 is overloaded, the proximity switch is closed to trigger the sound-light alarm system to work, so that the purpose of highlighting is achieved, certainly, the proximity switch can also be connected with the motor, when the torque reaches the preset torque, the proximity switch is triggered to act, and then a circuit connected with the proximity switch is controlled to be switched on or switched off.

Example 1

The following are rated voltages: 6KV, power: the 400KW three-phase asynchronous motor is transformed into rated voltage: 690V, power: the description is given by way of example of a 400KW permanent magnet synchronous motor, but the present invention is not limited to this kind of modification.

Referring to fig. 4, it is a diagram of the electrical control system of the present embodiment, in which the system directly adopts the on-site 6KV power voltage to step down to 690V through the dry step-down transformer with a rated power of 630 KVA. The two frequency converters are designed into a following relation, and the synchronous state of the two motors is strictly achieved (the two frequency converters can also be designed to simultaneously control a plurality of motors according to the use requirement). The parameters of the frequency converter adopt 690V rated voltage and 500KW rated power. The voltage grade adopts 690V, and the operation of motor and converter can be more safe and stable, and simple structure is convenient for later maintenance and change.

In the present application, two protective measures are taken simultaneously: one is to adopt a safety coupling 6, when the ore with very high hardness is crushed, the safety coupling 6 is disconnected with a motor, and umbrella teeth of a crusher 7 are protected; the other is electrical protection, when the ore with very high hardness is crushed, the frequency converter displays the numerical value of the current and the torque of the motor, the upper limit of the parameter is set, and when the upper limit is reached, the frequency converter feeds back a signal to stop the motor, so that the mechanical and electrical double insurance can better protect the equipment.

It is to be understood that elements not specifically set forth in this specification are well within the skill of the art or are well within the skill of those in the art.

It should be understood that the above description of the preferred embodiments is given in some detail, and not as a limitation to the scope of the invention, and that various alternatives and modifications can be devised by those skilled in the art without departing from the scope of the invention as defined by the appended claims.

Claims (5)

1. A novel low-speed high-torque permanent magnet direct-drive synchronous motor for a crusher comprises a motor, a safety coupling and the crusher; wherein the motor comprises motor stator, shell, electric motor rotor, and the stator part comprises motor casing, stator core, stator winding, and electric motor rotor comprises the rotor shaft, rotor core, permanent magnet and baffle, is equipped with fan, characterized by at the tail end of motor:

the tail end of the motor rotor is provided with a rotary transformer, the wiring end of the motor is connected with a frequency converter, the input electrical end of the frequency converter is connected with a power supply, and the control mode adopted by the frequency converter is a closed-loop vector control mode;

the two motors are connected with the crusher through a safety coupling and are in following relation;

and the torque parameter upper limit of the frequency converter is consistent with the torque parameter upper limit of the safety coupling.

2. The novel low-speed high-torque permanent magnet direct-drive synchronous motor for the crusher as claimed in claim 1, wherein: the rotary transformer measures the rotation angle and angular speed of the rotor, the information (motor speed) collected by the rotary transformer is fed back to the frequency converter by the signal processing circuit, and the frequency converter adjusts the motor torque.

3. The novel low-speed high-torque permanent magnet direct-drive synchronous motor for the crusher as claimed in claim 1, wherein: the safety coupling comprises a steel ball type safety coupling, a steel grit type safety coupling, a hydraulic type safety coupling, a friction type safety coupling and a magnetic powder type safety coupling.

4. The novel low-speed high-torque permanent magnet direct-drive synchronous motor for the crusher as claimed in claim 3, wherein: the safety coupling model is serpentine spring in this application.

5. The novel low-speed high-torque permanent magnet direct-drive synchronous motor for the crusher as claimed in claim 1 or 3, wherein: and a proximity switch can be additionally arranged on the safety coupling and is connected with the sound-light alarm system, and when the crusher is overloaded, the proximity switch is closed to trigger the sound-light alarm system to work.

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