One-to-N time-sharing starting control circuit of permanent magnet synchronous motor frequency converter

Abstract

The utility model provides a one-to-N time-sharing starting control circuit of a permanent magnet synchronous motor frequency converter, and belongs to the technical field of motor starting. The circuit comprises a main line and a control loop, a plurality of circuit breakers in the main line are connected with phase lines L1, L2 and L3 of a three-phase alternating current power supply respectively, the output end of a circuit breaker QF0 is connected with the input end of a frequency converter INV, and the output end of the frequency converter INV is connected with the input ends of normally open contacts of a plurality of first contactors respectively. Output ends of the plurality of circuit breakers are respectively connected with corresponding normally open contact input ends of the plurality of second contactors; normally open contact output ends of the plurality of first contactors are respectively connected with corresponding normally open contact output ends of the plurality of second contactors in parallel and then are respectively connected with input ends of the plurality of self-starting motors; in a control loop, coils of a plurality of relays are connected in parallel, and a TA terminal and a TB terminal of the frequency converter INV are connected in series in a coil loop of the relays TF1, TF2... TFn which are connected in parallel.

Description

Technical Field

[0001] The utility model belongs to the technical field of motor starting control, and relates to a one-to-N time-sharing starting control circuit of a permanent magnet synchronous motor frequency converter. Background Art

[0002] At present, the main starting methods of asynchronously started permanent magnet synchronous motors are direct starting and inverter one-to-one starting. The starting circuit of the direct starting method is simple and does not require an external control circuit. However, in applications where a large starting torque and a small operating torque are required, the motor power needs to be increased to meet the starting torque requirements, resulting in a high-power motor with a very small load during operation, which increases the cost of the motor and wastes energy, and does not meet the requirements of energy conservation and environmental protection. Although the inverter one-to-one starting can solve the shortcomings of the direct starting method and minimize the installed capacity, it will cause a large number of inverters to be used when multiple motors are used in a cluster, and will greatly occupy the on-site installation space. Utility Model Content

[0003] The utility model aims to solve the above problems and provides a time-sharing starting control circuit of a permanent magnet synchronous motor inverter with one-to-N frequency converters.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A time-sharing starting control circuit of a permanent magnet synchronous motor frequency converter with one-to-N transmissions, comprising a frequency converter INV, a plurality of circuit breakers (QF0, QF1, QF2 ... QFn), a plurality of intermediate relays (JQX1, JQX2 ... JQXn), a plurality of No. 1 contactors (KM1, KM2 ... KMn), a plurality of No. 2 contactors (KM1A, KM2A ... KMnA), a plurality of starting buttons (SB1, SB2 ... SBn), a plurality of stop switches (SB1A, SB2A ... SBnA), a plurality of relays (TF1, TF2 ... TFn) and a plurality of self-starting motors (M1, M2 ... Mn), wherein the circuit comprises a main circuit and a control circuit, wherein in the main circuit, a plurality of circuit breakers (QF0, QF1, QF2 ... QFn) are respectively connected to a three-phase AC The phase lines (L1, L2, L3) of the power supply are connected, the output end of the circuit breaker QF0 is connected to the input end of the frequency converter INV, the output end of the frequency converter INV is respectively connected to the normally open contact input ends of the plurality of the first contactors (KM1, KM2 ... KMn), the output ends of the plurality of the circuit breakers (QF1, QF2 ... QFn) are respectively connected to the corresponding normally open contact input ends of the second contactors (KM1A, KM2A ... KMnA), the normally open contact output ends of the plurality of the first contactors (KM1, KM2 ... KMn) are respectively connected in parallel with the corresponding normally open contact output ends of the second contactors (KM1A, KM2A ... KMnA) and then respectively connected to the input ends of the plurality of the self-starting motors (M1, M2 ... Mn);

[0006] In the control circuit, the coils of the plurality of relays (TF1, TF2 ... TFn) are connected in parallel, the TA terminal and the TB terminal of the inverter INV are connected in series to the coil circuit of the parallel relays (TF1, TF2 ... TFn), the plurality of start buttons (SB1, SB2 ... SBn) are respectively connected in parallel with the normally open contacts of the plurality of intermediate relays (JQX1, JQX2 ... JQXn), and the output terminals of the plurality of start buttons (SB1, SB2 ... SBn) are respectively connected to the normally open contacts of the plurality of second terminals. The corresponding normally closed contact input ends of the contactors (KM1A, KM2A...KMnA) are connected, and the normally closed contact output ends of the plurality of the second contactors (KM1A, KM2A...KMnA) are respectively connected to the coil input ends of the plurality of the intermediate relays (JQX1, JQX2...JQXn) and the first contactor (KM1, KM2...KMn), and the coil output ends of the plurality of the intermediate relays (JQX1, JQX2...JQXn) and the first contactor (KM1, KM2...KMn) are connected to the neutral line.

[0007] Close the circuit breaker QF0-QFn, and power on the main line and control circuit. When the nth self-starting motor Mn needs to be started, first close the stop switch SBnA corresponding to the self-starting motor Mn, press the start button switch SBn, the intermediate relay JQXn self-locks and starts the inverter INV to enter the starting mode, and at the same time, the No. 1 contactor KMn is energized to start the corresponding nth self-starting motor Mn; after the self-starting motor Mn reaches the set frequency, the internal relay (TA / TB) of the inverter INV is energized, the coil of the relay TF1-TFn is energized, the coil of the No. 2 contactor KMnA is energized, the normally open contact is closed, and self-locking is achieved. The nth self-starting motor Mn enters the industrial frequency operation, and at the same time, the intermediate relay JQXn and the No. 1 contactor KMn are unlocked, and the inverter INV enters the standby state to prepare for the start of other self-starting motors. The overall control circuit structure is simple, and the purpose of starting multiple self-starting motors by one inverter can be achieved.

[0008] In the above-mentioned one-to-N time-sharing starting control circuit of a permanent magnet synchronous motor inverter, each output end of the plurality of stop switches (SB1A, SB2A...SBnA) is respectively connected to the corresponding normally open contact input ends of the plurality of No. 2 contactors (KM1A, KM2A...KMnA) and relays (TF1, TF2...TFn), and the normally open contact output ends of the plurality of No. 2 contactors (KM1A, KM2A...KMnA) and relays (TF1, TF2...TFn) are respectively connected to the coil input ends of the plurality of No. 2 contactors (KM1A, KM2A...KMnA) and relays (TF1, TF2...TFn) and are connected to the neutral line through the coil output ends of the No. 2 contactors (KM1A, KM2A...KMnA).

[0009] To start other self-starting motors, just wait for the inverter INV to enter the standby state and repeat the above actions. To shut down the nth self-starting motor Mn, just disconnect the corresponding stop switch SBnA.

[0010] Compared with the existing technology, the advantages of the utility model are: 1. The control circuit structure is simple, and it can achieve the purpose of starting multiple self-starting motors in time by one frequency converter, and then switch to normal power frequency operation after starting. 2. It can reduce the installed capacity, reduce the equipment cost, reduce the site occupied area, reduce energy consumption, and have a good effect in environmental protection and energy saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is the main circuit diagram of the circuit structure provided by the utility model;

[0012] Figure 2 This is a control circuit diagram provided by the utility model. DETAILED DESCRIPTION

[0013] like Figure 1 and Figure 2 As shown, a time-sharing starting control circuit of a permanent magnet synchronous motor inverter with one to N, including an inverter INV, a plurality of circuit breakers (QF0, QF1, QF2 ... QFn), a plurality of intermediate relays (JQX1, JQX2 ... JQXn), a plurality of No. 1 contactors (KM1, KM2 ... KMn), a plurality of No. 2 contactors (KM1A, KM2A ... KMnA), a plurality of start buttons (SB1, SB2 ... SBn), a plurality of stop switches (SB1A, SB2A ... SBnA), a plurality of relays (TF1, TF2 ... TFn) and a plurality of self-starting motors (M1, M2 ... Mn), the circuit includes a main circuit and a control loop, in the main circuit, a plurality of circuit breakers (QF0, QF1, QF2 ... QFn) are respectively connected to the three-phase The phase lines (L1, L2, L3) of the AC power supply are connected, the output end of the circuit breaker QF0 is connected to the input end of the frequency converter INV, the output end of the frequency converter INV is respectively connected to the normally open contact input ends of the plurality of first contactors (KM1, KM2 ... KMn), the output ends of the plurality of circuit breakers (QF1, QF2 ... QFn) are respectively connected to the corresponding normally open contact input ends of the plurality of second contactors (KM1A, KM2A ... KMnA), the normally open contact output ends of the plurality of first contactors (KM1, KM2 ... KMn) are respectively connected in parallel with the corresponding normally open contact output ends of the plurality of second contactors (KM1A, KM2A ... KMnA) and then respectively connected to the input ends of the plurality of self-starting motors (M1, M2 ... Mn);

[0014] In the control circuit, the coils of the plurality of relays (TF1, TF2 ... TFn) are connected in parallel, the TA terminal and the TB terminal of the inverter INV are connected in series to the coil circuit of the parallel relays (TF1, TF2 ... TFn), the plurality of start buttons (SB1, SB2 ... SBn) are respectively connected in parallel with the normally open contacts of the plurality of intermediate relays (JQX1, JQX2 ... JQXn), and the output terminals of the plurality of start buttons (SB1, SB2 ... SBn) are respectively connected to the normally open contacts of the plurality of second terminals. The corresponding normally closed contact input ends of the contactors (KM1A, KM2A...KMnA) are connected, and the normally closed contact output ends of the plurality of the second contactors (KM1A, KM2A...KMnA) are respectively connected to the coil input ends of the plurality of the intermediate relays (JQX1, JQX2...JQXn) and the first contactor (KM1, KM2...KMn), and the coil output ends of the plurality of the intermediate relays (JQX1, JQX2...JQXn) and the first contactor (KM1, KM2...KMn) are connected to the neutral line.

[0015] In the utility model, the circuit breakers QF0-QFn are closed, the main circuit and the control circuit are powered on, and when the nth self-starting motor Mn needs to be started, the stop switch SBnA corresponding to the self-starting motor Mn is closed first, and the start button switch SBn is pressed, the intermediate relay JQXn is self-locked and the inverter INV is started to enter the starting mode, and at the same time, the No. 1 contactor KMn is energized to start the corresponding nth self-starting motor Mn; after the self-starting motor Mn reaches the set frequency, the internal relay (TA / TB) of the inverter INV is energized, the coils of the relays TF1-TFn are energized, the coil of the No. 2 contactor KMnA is energized, the normally open contacts are closed, and self-locking is achieved, the nth self-starting motor Mn enters the industrial frequency operation, and at the same time, the intermediate relay JQXn and the No. 1 contactor KMn are unlocked, the inverter INV enters the standby state, and prepares for the start-up preparation state of other self-starting motors. The overall control circuit structure is simple, and the purpose of starting multiple self-starting motors by one inverter in time can be achieved.

[0016] Specifically, combined with Figure 1 and Figure 2 As shown, each output end of the plurality of stop switches (SB1A, SB2A...SBnA) is respectively connected to the corresponding normally open contact input ends of the plurality of No. 2 contactors (KM1A, KM2A...KMnA) and relays (TF1, TF2...TFn), and the normally open contact output ends of the plurality of No. 2 contactors (KM1A, KM2A...KMnA) and relays (TF1, TF2...TFn) are respectively connected to the coil input ends of the plurality of No. 2 contactors (KM1A, KM2A...KMnA) and are connected to the neutral line through the coil output ends of the No. 2 contactors (KM1A, KM2A...KMnA).

[0017] To start other self-starting motors, just wait for the inverter INV to enter the standby state and repeat the above actions. To shut down the nth self-starting motor Mn, just disconnect the corresponding stop switch SBnA.

[0018] The working principle of the utility model is as follows: the circuit breaker QF0-QFn is closed, the main circuit and the control circuit are powered on, and when the nth self-starting motor Mn needs to be started, the stop switch SBnA corresponding to the self-starting motor Mn is closed first, the start button switch SBn is pressed, the intermediate relay JQXn is self-locked and the inverter INV is started to enter the starting mode, and at the same time, the No. 1 contactor KMn is energized to start the corresponding nth self-starting motor Mn; after the self-starting motor Mn reaches the set frequency, the internal relay (TA / TB) of the inverter INV is energized, the coil of the relay TF1-TFn is energized, the coil of the No. 2 contactor KMnA is energized, the normally open contact is closed, and self-locking is achieved, the nth self-starting motor Mn enters the industrial frequency operation, and at the same time, the intermediate relay JQXn and the No. 1 contactor KMn are unlocked, the inverter INV enters the standby state, and prepares for the start-up preparation state of other self-starting motors. The overall control circuit structure is simple, and the purpose of starting multiple self-starting motors by one inverter in time sharing can be achieved;

[0019] To start other self-starting motors, just wait for the inverter INV to enter the standby state and repeat the above actions. To shut down the nth self-starting motor Mn, just disconnect the corresponding stop switch SBnA.

[0020] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A time-sharing starting control circuit of a permanent magnet synchronous motor inverter with one to N, comprising an inverter INV, a plurality of circuit breakers QF0, QF1, QF2 ... QFn, a plurality of intermediate relays JQX1, JQX2 ... JQXn, a plurality of No. 1 contactors KM1, KM2 ... KMn, a plurality of No. 2 contactors KM1A, KM2A ... KMnA, a plurality of start buttons SB1, SB2 ... SBn, a plurality of stop switches SB1A, SB2A ... SBnA, a plurality of relays TF1, TF2 ... TFn and a plurality of self-starting motors M1, M2 ... Mn, characterized in that: The circuit includes a main circuit and a control circuit. In the main circuit, several circuit breakers QF0, QF1, QF2...QFn are respectively connected to the phase lines L1, L2, and L3 of the three-phase AC power supply, the output end of the circuit breaker QF0 is connected to the input end of the frequency converter INV, the output end of the frequency converter INV is respectively connected to the normally open contact input ends of several first contactors KM1, KM2...KMn, the output ends of several circuit breakers QF1, QF2...QFn are respectively connected to the corresponding normally open contact input ends of several second contactors KM1A, KM2A...KMnA, the normally open contact output ends of several first contactors KM1, KM2...KMn are respectively connected in parallel with the corresponding normally open contact output ends of several second contactors KM1A, KM2A...KMnA and then respectively connected to the input ends of several self-starting motors M1, M2...Mn; In the control circuit, the coils of the relays TF1, TF2...TFn are connected in parallel, the TA terminal and the TB terminal of the inverter INV are connected in series to the coil circuits of the relays TF1, TF2...TFn connected in parallel, the start buttons SB1, SB2...SBn are connected in parallel to the normally open contacts of the intermediate relays JQX1, JQX2...JQXn, respectively, and the output terminals of the start buttons SB1, SB2...SBn are connected to the normally open contacts of the intermediate relays JQX1, JQX2...JQXn, respectively. The corresponding normally closed contact input ends of contactors KM1A, KM2A...KMnA are connected, and the normally closed contact output ends of several of the second contactors KM1A, KM2A...KMnA are respectively connected to the coil input ends of several of the intermediate relays JQX1, JQX2...JQXn and the first contactors KM1, KM2...KMn, and the coil output ends of several of the intermediate relays JQX1, JQX2...JQXn and the first contactors KM1, KM2...KMn are connected to the neutral line.

2. A one-to-N time-sharing starting control circuit for a permanent magnet synchronous motor inverter according to claim 1, characterized in that: The output ends of the several stop switches SB1A, SB2A...SBnA are respectively connected to the corresponding normally open contact input ends of the several No. 2 contactors KM1A, KM2A...KMnA and relays TF1, TF2...TFn, and the normally open contact output ends of the several No. 2 contactors KM1A, KM2A...KMnA and relays TF1, TF2...TFn are respectively connected to the coil input ends of the several No. 2 contactors KM1A, KM2A...KMnA and are connected to the neutral line through the coil output ends of the No. 2 contactors KM1A, KM2A...KMnA.

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