CN201402969Y

CN201402969Y - Protection device for synchronous motor

Info

Publication number: CN201402969Y
Application number: CN2009200562041U
Authority: CN
Inventors: 贺小波; 黄树明
Original assignee: ZHUHAI STROM ELECTRICAL Co Ltd
Current assignee: ZHUHAI STROM ELECTRICAL Co Ltd
Priority date: 2009-05-08
Filing date: 2009-05-08
Publication date: 2010-02-10
Anticipated expiration: 2019-05-08

Abstract

The utility model discloses a protection device for a synchronous motor, and aims to provide a special protection device suitable for a synchronous motor. The protection device comprises a CPU module(1), a power module (7), and a human-machine interface (MM1) module (2), a voltage and current input collection module (3), a switching value input module (4), a relay module (5), and a communicationmodule (6) which are connected with the CPU module; and the power module (7) is connected with the other modules for supplying power. The protection device can be widely applied to the field of synchronous motor protection.

Description

The synchronous motor protective device

Technical field

The utility model relates to a kind of synchronous motor protective device.

Background technology

Synchronous motor is a kind of alternating current machine, mainly does generator usefulness, also can do motor usefulness, and it is bigger generally to be used for power, and rotating speed does not require the manufacturing machine of adjusting, large pump for example, air compressor machine and mine ventilation machine etc.In recent years owing to permanent magnetic material and development of electronic technology, small synchronous motor obtains application more and more widely.Between rotation speed n when one of characteristics of synchronous motor are stable operation and the frequency f of stator current 1 strict relation of constant is arranged, that is: the rotation speed n of the rotation speed n of synchronous motor and rotating magnetic field ₀Identical.The name of " synchronously " is come therefrom.High pressure, jumbo synchronous motor adopt rotary pole formula structure; Low capacity adopts revolving-armature type.

Protection watch-dog at the motor operation conditions is referred to as motor protecting device.This installs by electric parameters such as the voltage of gathering motor, electric currents, monitors the operating condition of motor in real time, in time sends alarm signal when the discovery motor breaks down, and motor and power supply are separated from the safety that guarantees motor.Conventional motor protecting device comprises functions such as differential protection, short-circuit protection, thermal overload protection, overload protection, rotation-clogging protection.Owing to need the characteristics of " synchronously " when synchronous motor has operation; conventional motor protecting device does not provide the protection alarm function that (is referred to as " step-out ") when synchronous motor is asynchronous, and therefore conventional motor protecting device is not suitable for synchronous motor.

The utility model content

Technical problem to be solved in the utility model is to overcome the deficiencies in the prior art, and a kind of protective device that is specially adapted for synchronous motor is provided.

The technical scheme that the utility model adopted is: the utility model comprises CPU module, man-machine interface (MMI) module, electric current and voltage input acquisition module, switching input module, relay module, communication module, power module, described man-machine interface (MMI) module, described electric current and voltage input acquisition module, described switching input module, described relay module, described communication module is connected with described CPU module by data/address bus, described power module respectively with described CPU module, described man-machine interface (MMI) module, described electric current and voltage input acquisition module, described switching input module, described relay module, described communication module connects power supply.

Described CPU module comprises microprocessor (MCU), digital signal processor (DSP), adopt high-speed synchronous serial port (SPI) to be connected real time communication between described microprocessor (MCU) and the described digital signal processor (DSP), described microprocessor (MCU) adopts the MSP430F149 chip, and described digital signal processor (DSP) adopts the TMS320LF2407 chip.

Described CPU module also comprises big capacity nonvolatile storage, analog-to-digital conversion (A/D) chip.

The beneficial effects of the utility model are: the utility model is provided with electric current and voltage input acquisition module; switching input module; relay module; communication module is connected with CPU module; realization provides effective protection to synchronous motor; its defencive function has: differential protection (at motor interior phase fault or shorted-turn fault); the quick-break overcurrent protection; thermal overload protection; overload protection; rotation-clogging protection; unbalance protection; ground protection (at earth fault), under-voltage protection (at the external power source fault), reverse power protection; the low frequency protection, loss of synchronism protection (specially at synchronous motor).

In the utility model, CPU module has adopted microprocessor (MCU) and digital signal processor (DSP) dual processor, and described microprocessor (MCU) is connected real time communication with digital signal processor (DSP) by high-speed synchronous serial port (SPI), thereby significantly improved communication and processing speed, can be up to 4M.

Description of drawings

Fig. 1 is a structured flowchart of the present utility model;

Fig. 2 is the circuit theory diagrams of the utility model CPU module;

Fig. 3 is the circuit theory diagrams of the utility model man-machine interface (MMI) module;

Fig. 4 is the circuit theory diagrams of the utility model electric current and voltage input acquisition module;

Fig. 5 is the circuit theory diagrams of the utility model switching input module;

Fig. 6 is the circuit theory diagrams of the utility model relay module;

Fig. 7 is the circuit theory diagrams of the utility model communication module;

Fig. 8 is the circuit theory diagrams of the utility model power module.

Embodiment

As shown in Figure 1, the utility model comprises CPU module 1, man-machine interface (MMI) module 2, electric current and voltage input acquisition module 3, switching input module 4, relay module 5, communication module 6, power module 7, described man-machine interface (MMI) module 2, described electric current and voltage input acquisition module 3, described switching input module 4, described relay module 5, described communication module 6 is connected with described CPU module 1 by data/address bus, described power module 7 respectively with described CPU module 1, described man-machine interface (MMI) module 2, described electric current and voltage input acquisition module 3, described switching input module 4, described relay module 5, described communication module 6 connects power supply.

Described CPU module 1 comprises microprocessor (MCU), digital signal processor (DSP), and as shown in Figure 2, U1 is digital signal processor (DSP), adopts the TMS320LF2407 chip; U2 is microprocessor (MCU), adopts the MSP430F149 chip, and U2 adopts the high speed SPI serial port to be connected with U1, and U9 chip FM3104 adopts I ²The C serial port is connected with U1, and E1, E2 are the active oscillating devices, is respectively U1, U2 the rectilinear oscillation signal is provided.

Described CPU module 1 comprises that also big capacity nonvolatile storage, analog-to-digital conversion (A/D) chip are arranged at U9 inside, and described big capacity nonvolatile storage is used to store event information, fault waveform information, has not obliterated data function of power down; Analog-to-digital conversion (A/D) chip is converted to digital quantity signal with the analog signals of input.

Described man-machine interface (MMI) module 2 comprises LCD MODULE and keypad, described man-machine interface (MMI) module 2 major functions provide operating personnel device are provided with and the various information of display unit, LCD MODULE can show 10 Chinese character informations of the 4 every row of row, as shown in Figure 3, JKEY is the gang socket of keypad, and keyboard signal is delivered to described central processing module 1; JLCD is the gang socket of Liquid Crystal Module, adopts parallel interface to connect described central processing module 1, and U5, U6 are that level transferring chip will be the acceptable 5V level of LCD MODULE from the 3.3V level conversion of CPU module.

Be transformed into light current after described electric current and voltage input module 3 is isolated on-the-spot voltage/current instrument transformer secondary singal and press signal, and gather through analog-to-digital conversion (A/D) the chip input port that modulate circuit is delivered to described CPU module 1, as shown in Figure 4, PT1～PT7 is the voltage/current instrument transformer.

Described switching input module 4 is isolated the external switch status signal and is converted digital signal to and is input to described CPU module 1 and gathers, as shown in Figure 5, U29～U42 is high withstand voltage smooth lotus root chip, and external signal is isolated after filter circuit is delivered to described CPU module 1.

Described relay output module 5 comprises the output of No. 8 relays; described relay output module 5 receives the driving order of described CPU module 1; externally send tripping operation, combined floodgate or warning information; it is the protection executive component of synchronous motor protective device; as shown in Figure 6; output signal from described CPU module 1 makes up through U16～U19 chip logic, isolates by U21～U28 light lotus root chip, drives J1～J8 totally No. 8 relays by U20 then.

Described communication module 6 is used for synchronous motor protective device and long-distance intelligent devices communicating and exchange message.Described communication module 6 comprises bus signals change-over circuit, buffer circuit two parts, and the bus signals change-over circuit is the signal format that described CPU module 1 can receive with the conversion of signals of communication bus; Buffer circuit is with synchronous motor protective device and external communication bus electrical isolation; As shown in Figure 7, U43, U44, U45 are high-speed light lotus root chip, play the isolation signals effect, and U46 receives the RS485 signal and is converted to the Transistor-Transistor Logic level signal; U47 receives the CAN bus signals and is converted to the Transistor-Transistor Logic level signal.

Described power module 7 is converted to 3.3V, 5V, 24V voltage with outside 220V power of alterating and direct current, as shown in Figure 8, be input to modular power source behind external power source process inductance, the capacitor filtering,

export

5V, 24V voltage then, 5V voltage is converted to the output of 3.3V voltage through U6 again; Wherein, 3.3V voltage offers described CPU module 1, described man-machine interface (MMI) module 2, described communication module 6; 5V voltage offers described electric current and voltage input module 3, described switching input module 4; 24V voltage offers described relay output module 5.

The utility model can be widely used in the protection field of synchronous motor.

Claims

1. synchronous motor protective device; it is characterized in that: it comprises CPU module (1); man-machine interface (MMI) module (2); electric current and voltage input acquisition module (3); switching input module (4); relay module (5); communication module (6); power module (7); described man-machine interface (MMI) module (2); described electric current and voltage input acquisition module (3); described switching input module (4); described relay module (5); described communication module (6) is connected with described CPU module (1) by data/address bus, described power module (7) respectively with described CPU module (1); described man-machine interface (MMI) module (2); described electric current and voltage input acquisition module (3); described switching input module (4); described relay module (5); described communication module (6) connects power supply.

2. synchronous motor protective device according to claim 1; it is characterized in that: described CPU module (1) comprises microprocessor (MCU), digital signal processor (DSP), adopts high-speed synchronous serial port (SPI) to be connected real time communication between described microprocessor (MCU) and the described digital signal processor (DSP).

3. synchronous motor protective device according to claim 2 is characterized in that: described microprocessor (MCU) adopts the MSP430F149 chip, and described digital signal processor (DSP) adopts the TMS320LF2407 chip.

4. according to claim 1 or 2 or 3 described synchronous motor protective devices, it is characterized in that: described CPU module (1) also comprises big capacity nonvolatile storage, analog-to-digital conversion (A/D) chip.