CN103166189A - Delayed alarm protection method for alternating current (AC) variable-pitch motor - Google Patents

Abstract

The invention discloses a delayed alarm protection method for an alternating current (AC) variable-pitch motor. The method includes the following steps: step one, a given current loop is changed in a current loop control circuit, a maximum overload multiple, maximum overload time and delayed time of a delayed program are set; step two, when current starts to increase, an accumulated value of an accumulator starts to record time to accumulate, and when the current starts to decrease, the accumulated value starts to reduce and is reduced to zero; step three, when given current reaches the maximum overload multiple of rated current and the accumulated value reaches the maximum overload time, the current loop control circuit reduces the given current to the rated current; and step four, whether the given current keeps to be the rated current in the delayed time is judged, whether rotation speed of a direct current series excited motor is always less than a zero-speed threshold value is judged, if yes, output of a driver is cut off, and fault warning is alarmed, and if not, no action occurs. The delayed alarm protection method for the AC variable-pitch motor enhances production efficiency and safety performance.

Description

A kind of delayed alarm guard method that exchanges change oar motor

Technical field

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

Background technology

at present, in wind field pitch-controlled system used, the direct current pitch-controlled system has occupied the very big market, the change oar motor that uses is take series DC machine as main, direct current becomes the oar motor owing to passing through back-up source directly to the motor oar of powering back, thereby increased the reliability of system, but direct current becomes the oar motor generally to be applied in the small wind pitch-controlled system more, powerful direct current becomes the oar motor because volume is large, Heavy Weight, be not easy to install, and with commutator and brush, brought the maintenance issues of follow-up commutator and brush, thereby in medium-and-large-sized wind power pitch-controlled system all to exchange pitch-controlled system as main, change oar motor used is mainly asynchronous machine or permagnetic synchronous motor.

For the software feature of series DC machine, the characteristic of alternating current machine is harder, when externally load torque increases, rotation speed change is little, and electric current meeting fast rise, if electric current continue to keep higher value output, when namely external loading was always large, motor worked long hours and must burn under this state.

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 guard method that becomes the oar motor that exchanges, prevent that alternating current machine from long-time high electric current occurring, burning during high load capacity.

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

A kind of delayed alarm guard method that exchanges change oar motor; comprise and exchange the driver that becomes the slurry motor; described driver comprises current loop control circuit and the accumulator of connecting with described current loop control circuit, exchanges the delayed alarm guard method that becomes the oar motor and comprises the following steps:

Step 1: 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 2: 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 3: 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 4: 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 heavy load situation to exchange and become the oar motor and export the situation that large electric current burns always; By the increase setting of delaying time, can further solve in the situation that roller box is stuck or do not unclamp because other reasons causes motor internal contracting brake, exchange the problem that becomes oar motor long-play and burn, enhance 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 delayed alarm guard method that exchanges change oar motor of the present embodiment; comprise and exchange the driver that becomes the slurry 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 1: 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 2: 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 3: 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 4: 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, and quote fault and remind; Otherwise, do not move.

The present embodiment can effectively reduce in long-time heavy load situation to exchange and becomes that the oar motor is exported large electric current and the situation of burning always; By the increase setting of delaying time, can further solve in the situation that roller box is stuck or do not unclamp because other reasons causes motor internal contracting brake, exchange the problem that becomes oar motor long-play and burn, enhance 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. one kind exchanges the delayed alarm guard method that becomes the oar motor; comprise and exchange the driver that becomes the slurry motor; described driver comprises current loop control circuit and the accumulator of connecting with described current loop control circuit, it is characterized in that: exchange the delayed alarm guard method that becomes the oar motor and comprise the following steps:

Step 1: 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 2: 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 3: 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 4: 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.