Control device for safe start of electric motor

A control device and motor safety technology, which is applied to the starter of a single multi-phase induction motor, motor generator/starter, etc., can solve the problems of unsafe power supply, delayed start of the motor, etc., and achieve simple structure and solution Secure boot issues, setting reasonable effects

Active Publication Date: 2018-03-23
STATE GRID HEILONGJIANG ELECTRIC POWER COMPANY +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem in the prior art that the delayed start motor cannot avoid the unsafe power supply, and provides a control device for safe start of the motor

Method used

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  • Control device for safe start of electric motor

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Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0012] Specific implementation mode one: the following combination figure 1 Describe this embodiment, the control device for the safe start of the motor described in this embodiment, which includes a power signal monitoring unit, a circuit breaker QS1, a circuit breaker QS2, a three-phase fuse FR, an intermediate relay KA, a start button SB1, a stop button SB2 and AC contactor KM1;

[0013] The three-phase motor M is sequentially connected to the three-phase power supply through the three-phase fuse FR, the AC contactor KM1 normally open main contact KM1-1 and the circuit breaker QS1;

[0014] The two AC input terminals of the power signal monitoring unit are respectively connected to live wires L1 and L3, and the two DC output terminals of the power signal monitoring unit are respectively connected to both ends of the intermediate relay KA coil;

[0015] Stop button SB2, start button SB1, intermediate relay KA normally open contact KA-1, AC contactor KM1 coil and three-phase...

specific Embodiment approach 2

[0017] Embodiment 2: This embodiment is a further description of Embodiment 1. The power signal monitoring unit includes a transformer T, a single-phase bridge rectifier circuit UR, a NE556 time-base integrated circuit IC1, a NE556 time-base integrated circuit IC2, and a 74LS393 counter IC3 , TC9160 timer chip IC4, 7805 regulator chip, NOR gate G1, NOR gate G2, NOR gate G3, NOR gate G4, resistor R1, resistor R2, resistor R3, resistor R4, resistor R5, resistor R6, Resistor R7, resistor R8, resistor R9, resistor R10, sliding rheostat RP, electrolytic capacitor C1, electrolytic capacitor C2, electrolytic capacitor C3, capacitor C4, electrolytic capacitor C5, capacitor C6, power status indicator LED and timer reset switch S1;

[0018] The two ends of the primary coil of the transformer T are respectively connected to live wires L1 and L3, the two ends of the secondary coil of the transformer T are respectively connected to the two AC input terminals of the single-phase bridge recti...

specific Embodiment approach 3

[0032] Embodiment 3: This embodiment is a further description of Embodiment 1. It also includes the power signal status indicator HL1, the power signal status indicator HL1 and the intermediate relay KA normally open contact KA-2 connected in series, through the circuit breaker QS2 Connect in parallel between live wires L2 and L3.

[0033] When the power supply is normal and the KA coil is energized, its normally open contact KA-2 is closed, and HL1 is on, and HL1 is used to further characterize the state of the power supply.

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PUM

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Abstract

The invention discloses a control apparatus for motor safe startup, belongs to the field of motor control, and solves the problem that the unsafe factors for the power supply cannot be avoided in the prior art by adopting a delay startup motor. The control apparatus comprises a power supply signal monitoring unit, circuit breakers QS1 and QS2, a three-phase fuse FR, an intermediate relay KA, a start button SB1, a stop button SB2 and an alternating current contactor KM1; a three-phase motor M is connected with a three-phase power supply through the FR, the KM1 normally-open main contact KM1-1 and the QS1 in sequence; two alternating current input ends of the power supply signal monitoring unit are connected with firing lines L1 and L3 respectively; the two direct current output ends of the power supply signal monitoring unit are connected with the two ends of the intermediate relay KA coils respectively; the SB2, the SB1, the KA normally-open contact KA-1, the KM1 coil and the FR auxiliary normally-closed contact are connected in series, and then connected between the firing lines L2 and L3 in parallel through the QS2; and the KM1 normally-open contacts KM1-2 are connected at the two ends of the start button SB1 in parallel.

Description

technical field [0001] The invention relates to a device for monitoring whether a motor is started in positive phase sequence, belonging to the field of motor control. Background technique [0002] There are many electrical equipment involved in the power system, and the motor is the core component of these electrical equipment. The safe start and use of the motor is of great significance to the normal operation of the power system. The power supply of these motors must be safe, and it will be safe when these motors are started. . [0003] The power used by the load is a circuit that uses three sinusoidal electromotive forces with the same frequency, the same amplitude, and a phase difference of 120° as the power supply. The three-phase power supply circuit can increase power by 50% compared with single-phase power supply in terms of power generation, and save 25% of steel materials in power transmission compared with single-phase power transmission. Electrical equipment h...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): H02P1/26
CPCH02P1/26
Inventor何朝阳姜德胜张歆炜李东辉孙国强
OwnerSTATE GRID HEILONGJIANG ELECTRIC POWER COMPANY