Device and method for automatically measuring response time of variable-pitch motor brake

Abstract

The invention discloses a device and a method for automatically measuring response time of a variable-pitch motor brake, and relates to the technical field of variable-pitch motors, and the device comprises an upper computer which is provided with an operation display interface; the measuring circuit comprises a single chip microcomputer, a first relay, a second relay and a current transformer which are arranged in a packaging box; according to the scheme, upper computer operation software, a brake measuring circuit and a data acquisition, judgment and uploading system are integrated; the problems that when an oscilloscope is used for online batch testing, time and labor are wasted due to manual measurement and recording, and data cannot be automatically stored are effectively solved, so that a variable-pitch motor manufacturer can 100% measure the response time of the brake when online detection is conducted after the brake is assembled into the whole machine, and the testing efficiency is improved. Whether the brake meets the use requirement or not is judged according to the corresponding standard, and powerful data support is provided for safe operation of a variable pitch system.

Description

Technical Field

[0001] The invention relates to an automatic measuring device and a measuring method for the response time of a pitch motor brake, and belongs to the technical field of pitch motors. Background Art

[0002] The permanent magnet variable pitch motor used in wind turbines is usually equipped with a brake to hold the variable pitch motor rotor after the motor is powered off, and finally fix the blades in a certain position. In the control system logic of the variable pitch motor, there are strict restrictions on the response time of the brake to loosen the motor rotor (brake release) and hold the motor rotor after power failure (brake engagement).

[0003] For example, when releasing the brake, some pitch control systems issue a command to supply power to the brake, wait for the expected brake release time, and then require the pitch control motor controller to issue three-phase power to supply the pitch control motor within a certain short period of time, so that the pitch control motor can start running. If the brake fails to loosen the motor rotor in time within the expected release time during this process, the inverter sends three-phase power to the motor. When the motor is powered on and ready to start running, the rotor is locked by a large braking torque (the braking torque of the brake is generally about 3 times the rated torque of the motor). The controller will issue a large current to overcome this braking torque. After the motor is subjected to this large current, it will have severe local heating in a short period of time. If things go on like this for a long time, the motor will be at risk of burning out. Therefore, the pitch control system requires the brake to have a fast release response time.

[0004] Another example is the engagement of the brake. When the pitch motor encounters a short circuit condition, the brake is needed to urgently hold the motor rotor. The pitch system can quickly cut off the current to the inverter and the motor, thereby avoiding greater losses. Therefore, the pitch system requires the brake to have a fast engagement response time.

[0005] In summary, under the premise that the rapid response of the brake is extremely important for the pitch system, the pitch motor manufacturer needs to measure the response time 100% when the brake is assembled into the whole machine for online testing, and judge whether the brake meets the use requirements based on the corresponding standards; the measurement of the brake response time is generally to build a set of circuits with power excitation, and use an oscilloscope to measure the current and voltage waveforms when the brake is opened and closed to make a judgment. Since the operation of the oscilloscope is a manual measurement and recording, it is time-consuming and labor-intensive, and it cannot be automatically recorded and saved. Therefore, it is necessary to propose a new solution to this problem. Summary of the invention

[0006] In view of the above-mentioned technical problems, the purpose of the present invention is to propose an automatic measurement device and method for the response time of a pitch motor brake.

[0007] The technical solution of the present invention is achieved as follows: a pitch motor brake response time automatic measurement device, comprising:

[0008] A host computer, wherein the host computer has an operation display interface;

[0009] A measuring circuit, the measuring circuit comprising a single-chip microcomputer, a first relay, a second relay and a current transformer arranged in a packaging box; one end of the first relay and the second relay are electrically connected to the brake through the current transformer, the other ends of the first relay and the second relay are electrically connected to the single-chip microcomputer, and the current transformer is electrically connected to the single-chip microcomputer, and the single-chip microcomputer is communicatively connected to a host computer; the single-chip microcomputer is used to control the opening and closing of the first relay and the second relay, the first relay is used to control the release of the brake, and the second relay is used to control the engagement of the brake, and the current change when the brake is released and engaged is displayed by an oscilloscope; the single-chip microcomputer monitors the current change on the brake in real time, and sends the current change data to the host computer, which records the current change data and outputs it on an operation display interface;

[0010] A power supply provides direct current to the brake.

[0011] Preferably, the data of the operation display interface of the host computer includes motor number, brake release current, data query, data storage, brake release and pull-in time record;

[0012] This includes data on the brake's forward and reverse energization states.

[0013] Preferably, the single chip microcomputer is provided with a communication serial port, and the single chip microcomputer is connected to the host computer via the communication serial port.

[0014] The present application also provides a method for measuring the response time of a pitch motor brake, comprising the following steps:

[0015] S1, acquisition of brake current;

[0016] After receiving the start signal from the host computer, the single-chip microcomputer first controls the first relay to energize the brake, so that the brake is in a released state, and then controls the second relay to de-energize the brake, so that the brake is in an engaged state; and in this process, the data of the current transformer is read to obtain the current size passing through the brake, and it is displayed on the oscilloscope;

[0017] When the brake is released when powered on, the current will slowly increase and generate a jump point; this jump point is the time point when the brake eliminates the braking torque when powered on; when the brake is pulled in when powered off, the current will slowly decrease and also generate a jump point, which is the time point when the brake establishes the braking torque when powered off;

[0018] S2, acquisition of release and pull-in time;

[0019] The single-chip microcomputer monitors the change of current in real time. When the brake is energized and released, the current begins to increase, and the internal clock of the single-chip microcomputer starts timing. When the current increases to the jump point, the timing ends, and the time interval is sent to the host computer.

[0020] When the brake is powered off and pulled in, the current starts to decrease, and the internal clock of the microcontroller starts timing. When the current decreases to the jump point, the timing ends and the time interval is sent to the host computer.

[0021] S3, data collection;

[0022] When the host computer receives the data from the measurement circuit, it records it in the corresponding format and outputs it on the operation display interface;

[0023] Among them, the motor number can be scanned by nameplate or recorded manually;

[0024] S4, automatic measurement is completed and recorded.

[0025] Preferably, in the step S1, the voltage required for energizing and de-energizing the brake is provided by a power supply in the measuring circuit.

[0026] Preferably, in the step S3, the data received by the host computer from the measurement circuit includes current change when the brake is released, current change when the brake is engaged, brake release time and brake engagement time.

[0027] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0028] The present invention integrates host computer operating software, brake measurement circuit, data acquisition, judgment and uploading system; it effectively solves the problem of time-consuming and labor-intensive manual measurement and recording during online batch testing with an oscilloscope, and the inability to automatically save data. As a result, the variable pitch motor manufacturer can measure 100% of its response time after the brake is assembled into the whole machine and during online testing, and judge whether the brake meets the use requirements based on corresponding standards, providing strong data support for the safe operation of the variable pitch system. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0030] Attached Figure 1 It is a structural schematic diagram of a device for automatically measuring the response time of a pitch motor brake according to the present invention;

[0031] Attached Figure 2 A schematic diagram of an operation display interface of a host computer of the present invention;

[0032] Attached Figure 3 The waveform diagram of the current and voltage extracted by the oscilloscope when the brake of the present invention is energized and released;

[0033] Attached Figure 4 The waveform diagram of the current and voltage extracted by the oscilloscope when the brake of the present invention is powered off and engaged;

[0034] Attached Figure 5 The present invention provides a logic block diagram of a method for measuring the response time of a pitch motor brake. DETAILED DESCRIPTION

[0035] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0036] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "straight", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0037] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] Embodiment 1

[0039] As attached Figure 1-2 As shown, the device for automatically measuring the response time of a pitch motor brake described in the present invention comprises a host computer, a measuring circuit and a power supply.

[0040] The host computer has an operation display interface; the measuring circuit includes a single-chip microcomputer, a first relay, a second relay and a current transformer arranged in a packaging box; one end of the first relay and the second relay are electrically connected to the brake through the current transformer, the other end of the first relay and the second relay are electrically connected to the single-chip microcomputer, and the current transformer is electrically connected to the single-chip microcomputer, and the single-chip microcomputer is communicatively connected to the host computer; in this embodiment, a communication serial port is arranged on the single-chip microcomputer, and the single-chip microcomputer and the host computer are connected through the communication serial port.

[0041] The single chip microcomputer is used to control the opening and closing of the first relay and the second relay. The first relay is used to control the release of the brake, and the second relay is used to control the engagement of the brake. The current changes when the brake is released and engaged are displayed by an oscilloscope.

[0042] Among them, when there is no measurement error in the measurement circuit, the change of brake current can be displayed without an oscilloscope. When there is a measurement error in the measurement circuit, the change of brake current needs to be displayed by an oscilloscope.

[0043] The single chip microcomputer monitors the current change on the brake in real time, and sends the current change data to the host computer, which records the current change data and outputs it on the operation display interface.

[0044] In this embodiment, the data on the operation display interface of the host computer includes motor number, brake release current, data query, data preservation, brake release and engagement time record; among them, data of the two states of brake forward and reverse power supply are included to facilitate comparison of the data of the two measurements, prevent single erroneous measurement, and thus improve the accuracy of the measurement.

[0045] The power supply provides alternating current to the measuring circuit and the brake.

[0046] Embodiment 2

[0047] As attached Figure 3-5 As shown, the present application also discloses a method for measuring the response time of a pitch motor brake, comprising the following steps:

[0048] S1, acquisition of brake current;

[0049] After receiving the start signal from the host computer, the single-chip microcomputer first controls the first relay to energize the brake, so that the brake is in a released state, and then controls the second relay to de-energize the brake, so that the brake is in an engaged state; and in this process, the data of the current transformer is read to obtain the current passing through the brake and display it on the oscilloscope; it should be noted that the single-chip microcomputer controls the power on and off of the first relay and the second relay separately and sequentially, and does not control them simultaneously.

[0050] Reference Figure 3-4 When the brake is released when powered on, the current will slowly increase and generate a jump point; this jump point is the time point when the brake eliminates the braking torque when powered on; when the brake is pulled in when powered off, the current will slowly decrease and also generate a jump point, which is the time point when the brake establishes the braking torque when powered off;

[0051] The voltage required for energizing and de-energizing the brake is provided by the power supply in the measuring circuit.

[0052] S2, acquisition of release and pull-in time;

[0053] The single-chip microcomputer monitors the change of current in real time. When the brake is energized and released, the current begins to increase, and the internal clock of the single-chip microcomputer starts timing. When the current increases to the jump point, the timing ends, and the time interval is sent to the host computer.

[0054] When the brake is powered off and energized, the current begins to decrease, and the internal clock of the microcontroller starts timing. When the current decreases to the jump point, the timing ends and the time interval is sent to the host computer.

[0055] Reference Figure 3-4 The microcontroller starts timing when the current is at the starting cursor line and ends timing when the current reaches the jump cursor line.

[0056] In order to ensure the accuracy of the data, the test software will record two sets of data when the power is first applied and the second time applied. Only when both sets of data meet the specified release and pull-in time requirements and the difference between the two sets of data meets the specified requirements, can the motor be allowed to leave the factory and the larger set of data will be recorded.

[0057] S3, data collection;

[0058] When the host computer receives the data from the measurement circuit, it records it in the corresponding format and outputs it on the operation display interface; the motor number can be recorded by scanning the nameplate or manually.

[0059] In this embodiment, the data received by the host computer from the measurement circuit includes the current change when the brake is released, the current change when the brake is engaged, the brake release time, and the brake engagement time.

[0060] S4, automatic measurement is completed and recorded.

[0061] To sum up, the automatic measurement device for the response time of the variable pitch motor brake of the present application integrates the upper computer operating software, brake measurement circuit, data acquisition, judgment and upload system; it effectively solves the time-consuming and labor-intensive manual measurement and recording during online batch testing with an oscilloscope, and the problem of being unable to automatically save data. As a result, the variable pitch motor manufacturer can measure 100% of its response time after the brake is assembled into the whole machine and during online testing, and judge whether the brake meets the use requirements based on the corresponding standards, providing strong data support for the safe operation of the variable pitch system.

[0062] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it. They cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. An automatic measuring device for the response time of a pitch motor brake, characterized in that: Include: A host computer, wherein the host computer has an operation display interface; A measuring circuit, the measuring circuit comprising a single chip microcomputer, a first relay, a second relay and a current transformer arranged in a packaging box; one end of the first relay and the second relay are electrically connected to the brake through the current transformer, the other ends of the first relay and the second relay are electrically connected to the single chip microcomputer, and the current transformer is electrically connected to the single chip microcomputer, and the single chip microcomputer is communicatively connected to a host computer; the single chip microcomputer is used to control the opening and closing of the first relay and the second relay, the first relay is used to control the release of the brake, and the second relay is used to control the closing of the brake, and the current change when the brake is released and closed is displayed by an oscilloscope; The single chip microcomputer monitors the current change on the brake in real time, and sends the current change data to the host computer, which records the current change data and outputs it on the operation display interface; A power supply provides direct current to the brake.

2. The automatic measuring device for the response time of a pitch motor brake according to claim 1 is characterized in that: The data on the operation display interface of the host computer include motor number, brake release current, data query, data storage, brake release and pull-in time record; This includes data on the brake's forward and reverse energization states.

3. The automatic measuring device for the response time of a pitch motor brake according to claim 1 is characterized in that: The single chip microcomputer is provided with a communication serial port, and the single chip microcomputer is connected with the host computer through the communication serial port.

4. A method for measuring the response time of a pitch motor brake, characterized in that: The following steps are involved: S1, acquisition of brake current; After receiving the start signal from the host computer, the single-chip microcomputer first controls the first relay to energize the brake, so that the brake is in a released state, and then controls the second relay to de-energize the brake, so that the brake is in an engaged state; and in this process, the data of the current transformer is read to obtain the current size passing through the brake, and it is displayed on the oscilloscope; When the brake is released when powered on, the current will slowly increase and generate a jump point; this jump point is the time point when the brake eliminates the braking torque when powered on; when the brake is pulled in when powered off, the current will slowly decrease and also generate a jump point, which is the time point when the brake establishes the braking torque when powered off; S2, acquisition of release and pull-in time; The single-chip microcomputer monitors the change of current in real time. When the brake is energized and released, the current begins to increase, and the internal clock of the single-chip microcomputer starts timing. When the current increases to the jump point, the timing ends, and the time interval is sent to the host computer. When the brake is powered off and pulled in, the current starts to decrease, and the internal clock of the microcontroller starts timing. When the current decreases to the jump point, the timing ends and the time interval is sent to the host computer. S3, data collection; When the host computer receives the data from the measurement circuit, it records it in the corresponding format and outputs it on the operation display interface; Among them, the motor number can be scanned by nameplate or recorded manually; S4, automatic measurement is completed and recorded.

5. The method for measuring the response time of a pitch motor brake according to claim 4, characterized in that: In the step S1, the voltage required for energizing and deenergizing the brake is provided by a power supply in the measuring circuit.

6. The method for measuring the response time of a pitch motor brake according to claim 4, characterized in that: In the step S3, the data received by the host computer from the measurement circuit includes the current change when the brake is released, the current change when the brake is engaged, the brake release time and the brake engagement time.

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