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Frequency relay

A relay and frequency technology, applied in the field of YZR motor rotor resistance switching device, can solve the problems of irregular switching torque and current impact, not very accurate, unsafe equipment operation, etc., to speed up response time, improve operation safety, structure simple effect

Inactive Publication Date: 2009-12-30
大连美恒时代科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the setting time is too long and the resistance is cut off too late, the starting time will be too long, which is not conducive to the use and control of the equipment, and reduces the efficiency of the equipment. image 3 The control effect diagram of the motor rotor resistance cut-off time relay control mode is shown. When the actual motor switches the rotor resistance, the switching torque and current impact are extremely irregular (see paragraphs ab, cd, ef, gh), and most case is much greater than the motor rating of the
This is because the switching condition is controlled by the time relay, but in practice, the adjustment of the time relay is completely based on empirical values ​​(see bc, de, fg paragraphs), which is not very accurate
In addition, due to the different action of the load in different running directions, the adjustment of the time is more difficult. In the downward direction, because the load is the acceleration torque, the deceleration of the motor is large, and the setting time is short, which is beneficial to the motor. But in the upward direction, Since the load is a resistance torque, the deceleration of the motor is small, and the setting time is short, there is the same situation as the resistance load, or even worse
Conversely, if the setting time is long, it may be suitable in the upward direction, but in the downward direction, the long time will cause the motor to run at an overspeed, which will bring unsafe operation to the equipment.

Method used

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Experimental program
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Effect test

Embodiment 1

[0021] Embodiment 1: as Figure 4 , Figure 5 As shown in the figure, it is single-speed control of the motor. When measuring, connect the detection input terminal of the frequency measurement circuit to the rotor terminal of the YZR three-phase asynchronous winding motor, and filter out the input voltage signal through the filter in the frequency measurement circuit. Harmonic components, DC components and interference signals are used to restore the frequency of the power supply under test. After being processed by the operational amplifier and analog / digital conversion, they are handed over to the single-chip microcomputer for processing and calculation. Finally, the frequency of the power supply is calculated to be the same as that of the single-chip microcomputer. The input switching frequency value is compared, and when the measured frequency reaches the set value, the single-chip computer controls the corresponding relay action to complete the control of gear switching (...

Embodiment 2

[0022] Embodiment 2: as Figure 6 , Figure 7 and Figure 8 As shown, its wiring mode and device setting are the same as those in Embodiment 1, the difference is that the switching control of 4 gears is adopted here, that is, the relay unit needs 4 relays to complete the switching task of 4 gears, Correspondingly set the input unit to input the frequency values ​​of 4 suitable switching points. Such as Figure 6 As shown, four switching points a, b, c, and d are input to the controller by setting the input unit. It is an automatic process to complete the resistance switching of the YZR three-phase asynchronous winding motor with this device, as shown in Figure 8 In the case of switching the rotor resistance shown, it can be seen that the actual motor switches the rotor resistance, and the switching torque and the current it bears are extremely regular (see paragraphs ab, cd, ef, and gh). Through parameter setting, your motor can have sufficient torque when the rotor resis...

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Abstract

The invention discloses a frequency relay, which is characterized by comprising a frequency measuring circuit, a setting input unit, a relay unit and a control unit. The received frequency signals of a YZR motor rotor sent by the frequency measuring circuit are converted into specific frequency numerical values; the specific frequency numerical values are compared with the frequency setting value of the YZR motor rotor, which actualizes relay and is input by the setting input unit, and a control signal is sent to the relay unit after the frequency of the YZR motor rotor sent by the frequency measuring circuit reaches the frequency setting value so as to operate the relay in the relay unit. In the switch device provided in the invention, the frequency relay is more accurately controlled than a time relay compared with the traditional control mode of the YZR type three-phase asynchronous winding motor. Besides, the invention is simple in structure, convenient to produce, low in cost, and suitable to be widely promoted in the switching field of motor rotor resistors.

Description

technical field [0001] The invention relates to a YZR motor rotor resistance switching device, in particular to a frequency relay which uses a frequency relay to control the YZR motor rotor resistance switching. Background technique [0002] YZR three-phase asynchronous wound motors are often used in industrial equipment such as metallurgical machinery and cranes. In the control of YZR three-phase asynchronous wound motor, resistors need to be connected in series in the rotor circuit to control its starting torque and reduce its starting current. However, when the YZR three-phase asynchronous wound motor needs to run at full speed, it is necessary to cut off the resistance connected in series in the rotor circuit. Cutting needs to be switched step by step. At present, the traditional control of YZR three-phase asynchronous wound motor rotor resistance is cut off step by step by using the delay function of the time relay. Since the delay time of the time relay is set artifi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P1/34H02H7/08
Inventor 滕波
Owner 大连美恒时代科技有限公司