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State detection circuit and a state detection method of electromagnetic brake

A technology of electromagnetic brake and state detection

Active Publication Date: 2018-06-15
BEIJING GOLDWIND SCI & CREATION WINDPOWER EQUIP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] This detection method requires a major improvement to the internal structure of the pitch brake, and the pitch brake needs to be redesigned, and the specific working status of the pitch brake cannot be accurately judged.

Method used

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  • State detection circuit and a state detection method of electromagnetic brake
  • State detection circuit and a state detection method of electromagnetic brake
  • State detection circuit and a state detection method of electromagnetic brake

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no. 4 example

[0092] According to the fourth embodiment of the present invention, the state detection circuit may include an acquisition unit 31 , an amplification unit 52 , a comparison unit 55 , a reference signal generation unit 51 and a processor 60 .

[0093] The acquisition unit 31 may include a sampling resistor 32, which may be connected in series with the coil 50 of the electromagnetic brake, and the amplification unit 52 may amplify the acquisition signal of the acquisition unit 31 (for example, the voltage across the sampling resistor 32).

[0094] The amplification unit 52 may be an operational amplifier or other types of amplifiers. Specifically, the positive input terminal and the negative input terminal of the amplifying unit 52 may be respectively connected to both ends of the sampling resistor 32, and resistors R6 and R7 connected in parallel may be connected between the negative input terminal and the output terminal of the amplifying unit 52, And the amplification gain (i...

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Abstract

The invention provides a state detection circuit and a state detection method of an electromagnetic brake. The electromagnetic brake comprises a coil; the state detection circuit comprises an acquisition unit and a processor, wherein the acquisition unit is electrically connected with the coil and acquires the electric signal of the coil; and the processor determines the working state of the electromagnetic brake based on the electric signal. According to the state detection circuit and the state detection method, the electric signal of the coil is directly detected, the working state of the electromagnetic brake is determined, and the internal structure of the electromagnetic brake does not need to be redesigned. According to the state detection circuit and the state detection method, theworking state of the electromagnetic brake is determined through at least one of the amplitude value of the electric signal and the duty ratio of a PWM signal, and the abnormal state of the electromagnetic brake of different types can be detected.

Description

technical field [0001] The invention relates to the field of electromagnetic brakes, in particular to a state detection circuit and a state detection method of an electromagnetic brake. Background technique [0002] The pitch system in the wind turbine is mainly used to control the rotation speed of the impeller by controlling the angle of the blade, so as to control the output power of the wind generator. During the normal operation of the wind turbine, when the wind speed is lower than the rated wind speed of the wind turbine, the pitch system will rotate the blades to the 0-degree angle position, and the windward area of ​​the blades will be the largest, so that the output power of the wind turbine will be maximized; when the wind speed exceeds the wind force When the rated wind speed of the generator set is reached, the pitch system keeps the speed of the wind rotor constant by controlling the angle of the blades. During the pitch change process of the wind power genera...

Claims

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Application Information

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IPC IPC(8): F16D66/02F03D17/00
CPCF16D66/022F03D17/00
Inventor 张明阳许东宁马磊
Owner BEIJING GOLDWIND SCI & CREATION WINDPOWER EQUIP
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