CN103166184A - Delayed alarm method for direct current variable pitch motor - Google Patents

Abstract

The invention discloses a delayed alarm method for a direct current variable pitch motor. The method includes: a set step is that electric current loop set in an electric current loop control circuit is changed, and the maximum overload multiple, the maximum overload time and delay time of a time-delay program are set; an accumulative step is that when electric currents start to rise, an accumulated value of an accumulator starts to accumulate in a timing mode, and when the electric currents start to fall, the accumulated value starts to decrease until zero; a protection step is that after given electric currents reach the maximum overload multiple of rated currents and the accumulated value reaches the maximum overload time, the electric current loop control circuit decreases the given electric currents to the rated currents; a delayed alarm step is that within the delay time, the situations that the given electric currents keeps the rated currents constant, and the rotation speed of a direct current series excited motor is smaller than a zero-speed threshold value all along are judged; if yes, the output of an actuator is cut off and failure warning is alarmed; and if not, actions do not happen. According to the delayed alarm method for the direct current variable pitch motor, the production efficiency and the safety performance are improved.

Description

A kind of direct current becomes the delayed alarm method of oar motor

Technical field

The present invention relates to wind power generation field, relate in particular to a kind of delayed alarm method that direct current becomes the oar motor.

Background technology

at present, in wind field pitch-controlled system used, the direct current pitch-controlled system has occupied the very big market, the direct current pitch-controlled system is owing to directly returning oar by back-up source, thereby increased the reliability of system, in the direct current pitch-controlled system, direct current series-excited motor is because detent torque is large, the advantages such as overload capacity is strong, thereby become the first-selection that direct current becomes the oar motor, yet in the wind field practical application, usually find to have the situation that becomes the oar burn-down of electric motor to exist, trace it to its cause, has plenty of gear box stuck, having plenty of band-type brake does not unclamp, cause the very large even stall of motor load, thereby electric current is very large motor damage for a long time.

Because the series machine characteristic is softer, when the external loading torque surpasses motor output torque, motor speed can descend until be zero, electric current can rise at once, this characteristic is more useful in becoming the oar process, when becoming the prominent gust of wind of meeting in the oar process, when making change oar electric motor load torque exceed its output torque, become the oar motor rotation blockage, make blade position constant, after wind is little, then continue to forward blade to required angle position according to the master control order, avoided instantaneous its maximum power that exceeds of main generator power output.Although series DC machine overload capacity is stronger, if but motor stall always, drivers velocity ring output saturation, being that electric current loop is given is always maximum, suppose that maximum given electric current is 3 times of motor rated current, under the electric current loop effect, during stall, current of electric keeps 3 times of motor rated current outputs always, in the situation that the so large function of current, the time one, long motor must burn.

Summary of the invention

In view of the defective that above-mentioned prior art exists, the objective of the invention is to propose a kind of delayed alarm method that direct current becomes the oar motor, prevent direct current machine for a long time, burn in the situation of large electric current.

Purpose of the present invention will be achieved by the following technical programs:

A kind of direct current becomes the delayed alarm method of oar motor, comprises the driver of direct current series-excited motor, and described driver comprises current loop control circuit and the accumulator of connecting with described current loop control circuit, and the delayed alarm method that direct current becomes the oar motor comprises the following steps:

Step S1: setting steps, change electric current loop given in described current loop control circuit, maximum overload multiple and maximum overload time are set, and the time of delay of delay procedure;

Step S2: accumulation step, when electric current began to rise, it is cumulative that the accumulated value of described accumulator begins timing, and when electric current began to descend, described accumulated value began to reduce, until be zero;

Step S3: the protection step, the maximum overload multiple and the described accumulated value that reach rated current when given electric current reach maximum overload after the time, and described current loop control circuit is reduced to rated current with given electric current:

Step S4: the delayed alarm step, whether judgement given electric current in described delay time keeps rated current constant, and whether the rotating speed of direct current series-excited motor is always less than the zero-speed threshold value; If cut off the output of described driver, and quote fault and remind; Otherwise, do not move.

Outstanding effect of the present invention is: can effectively reduce in long-time stall situation series machine and export the situation that large electric current burns always; By increasing delay procedure, can further solve in the situation that roller box is stuck or do not unclamp because other reasons causes motor internal contracting brake series machine long-play and the problem of burning is enhanced productivity and security performance.

Following constipation closes embodiment, the specific embodiment of the present invention is described in further detail, so that technical solution of the present invention is easier to understand, grasp.

Embodiment

Embodiment

A kind of direct current of the present embodiment becomes the delayed alarm method of oar motor, the driver that comprises direct current series-excited motor, driver comprises current loop control circuit and the accumulator of connecting with the current loop control circuit, and increasing in the current loop control circuit has delay procedure, and it comprises the following steps:

Step S1: setting steps, change electric current loop given in the current loop control circuit, maximum overload multiple and maximum overload time are set, and the time of delay of delay procedure;

Step S2: accumulation step, when electric current began to rise, it is cumulative that the accumulated value of accumulator begins timing, and when electric current began to descend, accumulated value began to reduce, until be zero;

Step S3: the protection step, the maximum overload multiple and the accumulated value that reach rated current when given electric current reach maximum overload after the time, and the current loop control circuit is reduced to rated current with given electric current;

Step S4: the delayed alarm step, whether judgement given electric current in delay time keeps rated current constant, and whether the rotating speed of direct current series-excited motor is always less than the zero-speed threshold value; If, cut off the output of driver, make motor stalling, and quote fault and remind; Otherwise, do not move.

The present embodiment can reduce effectively that series machine in long-time stall situation is exported large electric current always and the situation of burning; By increasing delay procedure, can further solve in the situation that roller box is stuck or do not unclamp because other reasons causes motor internal contracting brake series machine long-play and the problem of burning is enhanced productivity and security performance.

The present invention still has numerous embodiments, and all employing equivalents or equivalent transformation and all technical schemes of forming are within all dropping on protection scope of the present invention.

Claims (1)

1. a direct current becomes the delayed alarm method of oar motor, the driver that comprises direct current series-excited motor, described driver comprises current loop control circuit and the accumulator of connecting with described current loop control circuit, it is characterized in that: the delayed alarm method that direct current becomes the oar motor comprises the following steps:

Step S1: setting steps, change electric current loop given in described current loop control circuit, maximum overload multiple and maximum overload time are set, and the time of delay of delay procedure;

Step S2: accumulation step, when electric current began to rise, it is cumulative that the accumulated value of described accumulator begins timing, and when electric current began to descend, described accumulated value began to reduce, until be zero;

Step S3: the protection step, the maximum overload multiple and the described accumulated value that reach rated current when given electric current reach maximum overload after the time, and described current loop control circuit is reduced to rated current with given electric current;

Step S4: the delayed alarm step, whether judgement given electric current in described delay time keeps rated current constant, and whether the rotating speed of direct current series-excited motor is always less than the zero-speed threshold value; If cut off the output of described driver, and quote fault and remind; Otherwise, do not move.