Traction machine system and elevator

Abstract

The utility model relates to the technical field of traction machines, and discloses a traction machine system and an elevator, the traction machine system comprises an energy storage module, a first power conversion module and a second power conversion module, the energy storage module outputs direct current under the condition of alternating current power failure; when the motor is powered on, discharging is carried out when the voltage is higher than the bus voltage output by the first power conversion module, discharging is stopped when the voltage is lower than a preset voltage threshold value in the discharging process, and the bus voltage is larger than the preset voltage threshold value; the first power conversion module converts the alternating current into bus voltage under the condition that the alternating current is not powered down; the second power conversion module converts the bus voltage into alternating current and then supplies power to the motor; when the motor is braked, the braking energy is fed back to the energy storage module, so that a braking resistor does not need to be arranged, and energy recovery can be realized only by arranging the simple energy storage module.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of traction machine, concretely relates to a traction machine system and elevator. BACKGROUND

[0002] In elevator application, the existing brake system adopts energy consumption braking mode, consumes energy through braking power device and brake resistance, which not only causes energy loss unable to recover, but also the brake resistance is usually large in size, needs to set corresponding lead terminal and connect complex wire harness at the control end, occupies a large amount of space, brings many inconveniences to the installation and maintenance of elevator. SUMMARY

[0003] Therefore, the utility model provides a traction machine system and elevator to solve the problem of how to realize energy recovery when braking.

[0004] In a first aspect, the utility model provides a traction machine system, comprising: energy storage module, first power conversion module, second power conversion module, wherein, energy storage module, its first end is connected with the first end of second power conversion module, it is used to output direct current under the condition of alternating current power failure, discharges when the voltage of motor is higher than the bus voltage output by first power conversion module when motor is driven, and stops discharging when the voltage is lower than the preset voltage threshold during discharging, and the bus voltage is greater than the preset voltage threshold, first power conversion module, the alternating current side is power access end, the direct current side is connected with the direct current side of second power conversion module, it is used to convert alternating current into bus voltage under the condition that alternating current is not power failure, second power conversion module, the alternating current side is motor access end, it is used to supply power for motor after converting bus voltage into alternating current, and the braking energy is fed back to energy storage module when motor is braked.

[0005] In the utility model, the braking energy is fed back to the energy storage module when the motor is braked, so that the brake resistance does not need to be set, and the energy recovery can be realized by only setting simple energy storage module. When the external power failure, the energy storage module can release the recovered energy, and supply power for the motor again, so as to ensure the normal operation and protection of the system.

[0006] In an alternative embodiment, the energy storage module comprises: power storage battery, first relay, filter inductor and feedback IGBT, wherein, power storage battery, its first end is connected with the first end of filter inductor through first relay, its second end is connected with the second direct current end of second power conversion module, filter inductor, its second end is connected with the emitter of feedback IGBT, and feedback IGBT, its collector is connected with the first direct current end of second power conversion module.

[0007] In an alternative embodiment, the first power conversion module comprises: a three-phase rectifier circuit, a support capacitor, a bus capacitor group and a buffer capacitor, wherein the three-phase rectifier circuit has an AC side connected to the power supply and a DC side connected to the support capacitor, the bus capacitor group and the buffer capacitor in sequence, and the DC side is also connected to the DC side of the second power conversion module.

[0008] In an alternative embodiment, the first power conversion module further comprises: a soft start circuit arranged between the support capacitor and the bus capacitor group, and the soft start circuit comprises: a resistance branch and a second relay connected in parallel.

[0009] In an alternative embodiment, the second power conversion module comprises: a three-phase inverter circuit, wherein the DC side of the three-phase inverter circuit is connected to the DC side of the first power conversion module and the first end of the energy storage module, and the AC side is connected to the motor.

[0010] In an alternative embodiment, the second power conversion module further comprises: a braking circuit connected in parallel to the DC side of the three-phase inverter circuit, and the braking circuit comprises: a first diode and a braking IGBT, wherein the cathode of the first diode is connected to the first DC end of the second power conversion module, and the anode is connected to the collector of the braking IGBT; and the emitter of the braking IGBT is connected to the second DC end of the second power conversion module.

[0011] In an alternative embodiment, the traction machine system further comprises: an overvoltage protection circuit, and the overvoltage protection circuit comprises: a plurality of voltage-dependent resistors, wherein one voltage-dependent resistor is connected in parallel between each two phases of the AC side of the first power conversion module.

[0012] In an alternative embodiment, the traction machine system further comprises: a sampling circuit, a driving and control circuit, wherein the sampling circuit is used to collect the AC side voltage and current of the first power conversion module, the bus voltage, the AC side voltage and current of the second power conversion module; and the driving circuit is used to generate the control signal of the switch tube in the second power conversion module based on the collected information output by the sampling circuit.

[0013] In an alternative embodiment, the traction machine system comprises: a fault detection circuit, which is used to detect multiple fault types of the traction machine system based on the collected information output by the sampling circuit.

[0014] In a second aspect, the utility model provides a kind of elevator comprising the traction machine system of the first aspect and any alternative embodiment thereof, motor and elevator body. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description. Obviously, the drawings described below are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0016] Figure 1 is a component diagram of a traction machine system according to an embodiment of the present application;

[0017] Figure 2 is a specific circuit structure diagram of a traction machine system according to an embodiment of the present application. Specific embodiments

[0018] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the following will combine the drawings in the embodiments of the present application to clearly and completely describe the technical scheme in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0019] In the description of the present application, it should be noted that the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0020] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood in a broad sense. For example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between two elements, or it can be wireless connection or wired connection. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0021] In addition, the technical features involved in different embodiments of the present application described below can be combined with each other as long as there is no conflict.

[0022] In the present embodiment, a traction machine system is provided, Figure 1 is a component diagram of a traction machine system for a specific example, as Figure 1 shown, the traction machine system comprises: an energy storage module, a first power conversion module, a second power conversion module.

[0023] AsFigure 1 The energy storage module, whose first end is connected with the first end of the second power conversion module, has the following functions:

[0024] ① In the case of AC power outage, output DC power. ② In the case of motor driving, discharge when the voltage is higher than the bus voltage output by the first power conversion module, and stop discharging when the voltage is lower than the preset voltage threshold during discharging. The bus voltage is greater than the preset voltage threshold. ③ In the case of motor braking, recover energy.

[0025] As shown in Figure 1 The first power conversion module, whose AC side is the power input end, and whose DC side is connected with the DC side of the second power conversion module, is used to convert AC power into bus voltage in the case of no AC power outage.

[0026] As shown in Figure 1 The second power conversion module, whose AC side is the motor input end, is used to convert the bus voltage into AC power to supply power to the motor; and in the case of motor braking, the braking energy is fed back to the energy storage module.

[0027] Specifically, during the operation of the motor, there are the following cases:

[0028] ① In the case of no AC power outage and motor driving, the first power conversion module rectifies AC power into DC power, i.e. bus voltage, and if the voltage of the energy storage module is greater than the bus voltage, the energy storage module is controlled to discharge. At this time, the second power conversion module converts the DC power output by the first power conversion module and the DC power output by the energy storage module into AC power to supply power to the motor.

[0029] ② In the case of AC power outage and motor driving, the energy storage module is controlled to discharge, and at this time the second power conversion module converts the DC power output by the energy storage module into AC power to supply power to the motor.

[0030] Wherein, in the case of motor driving, when the voltage of the energy storage module is lower than the preset voltage threshold during discharging of the energy storage module, the energy storage module is controlled to stop discharging, thereby ensuring that the power storage battery reaches a certain power balance.

[0031] ③ In the case of motor braking, the second power conversion module rectifies the AC power at the motor end into DC power to charge the energy storage module, thereby realizing braking energy recovery.

[0032] In some optional embodiments, Figure 2 The specific circuit structure diagram of the traction machine system is shown in Figure 2As shown, the energy storage module includes: a power storage battery, a first relay J1, a filter inductor L, and a feedback IGBT Q1, wherein the first end of the power storage battery is connected with the first end of the filter inductor L through the first relay J1, and the second end of the power storage battery is connected with the second DC end of the second power conversion module; the second end of the filter inductor L is connected with the emitter of the feedback IGBT Q1; the collector of the feedback IGBT Q1 is connected with the first DC end of the second power conversion module.

[0033] Specifically, when the energy storage battery is charging or discharging, the first relay J1 and the feedback IGBT Q1 are closed to form a charging loop or a discharging loop, wherein the discharging loop outputs the DC power of the power storage battery to the DC side of the second power conversion module, and the second power conversion module converts the DC power into AC power to supply the motor, and the charging loop converts the braking energy output of the second power conversion module into AC power when the motor is braking, and feeds back to the power storage battery, thereby realizing the feedback of the braking energy.

[0034] Specifically, when the motor is motoring, during the discharging process of the power storage battery, the voltage of the power storage battery is detected, and when the voltage of the power storage battery is higher than the bus voltage after rectification, the motoring discharging is performed, and when the voltage is lower than the preset voltage threshold, the discharging is stopped.

[0035] In some optional embodiments, as shown in Figure 2 As shown, the first power conversion module includes: a three-phase rectifier circuit, a support capacitor C1, a bus capacitor group (C3 and C4), and a buffer capacitor C2, wherein the AC side of the three-phase rectifier circuit is the power supply access end, the DC side is connected with the support capacitor C1, the bus capacitor group, and the buffer capacitor C2 in parallel, and the DC side is also connected with the DC side of the second power conversion module.

[0036] Specifically, the three-phase rectifier circuit is a non-controlled rectifier circuit, which is composed of three bridge arms, and a diode is arranged on each bridge arm. Optionally, Figure 2 The topology of the three-phase rectifier circuit shown can also be other rectifier circuits, for example: replacing the diode with an IGBT, a MOSFET, a SiC, etc., which is not limited here.

[0037] In some optional embodiments, the first power conversion module further includes: a soft start circuit arranged between the support capacitor C1 and the bus capacitor group, as shown in Figure 2 As shown, the soft start circuit includes: a parallelly connected resistance branch (i.e. R1, R2) and a second relay J2.

[0038] Specifically, when the motor is in the motoring mode, the second power conversion module is not started, and the second relay is closed, so that the direct current output by the three-phase rectifier circuit first charges the capacitor, and when the voltage of the capacitor reaches a certain value, the second relay is opened, and the second power conversion module is started at the same time, so as to realize soft start.

[0039] In some optional embodiments, the second power conversion module comprises a three-phase inverter circuit, wherein the direct current side of the three-phase inverter circuit is connected with the direct current side of the first power conversion module and the first end of the energy storage module, and the alternating current side is the motor access end.

[0040] Optionally, as shown in Figure 2 The three-phase inverter circuit is composed of IGBT tubes S1-S6. By controlling the switching sequence and conduction time of the IGBT tubes S1-S6, the energy flow direction can be controlled to realize power supply for the motor or feedback of braking energy to the energy storage module.

[0041] In some optional embodiments, the second power conversion module further comprises a braking circuit connected in parallel with the direct current side of the three-phase inverter circuit, as shown in Figure 2 The braking circuit comprises a first diode D1 and a braking IGBT Q2, wherein the cathode of the first diode D1 is connected with the first direct current end of the second power conversion module, the anode is connected with the collector of the braking IGBT Q2, and the emitter of the braking IGBT Q2 is connected with the second direct current end of the second power conversion module. Specifically, when a sudden situation occurs, built-in braking is realized by closing the braking IGBT Q2.

[0042] In some optional embodiments, the traction machine system further comprises an overvoltage protection circuit, wherein the overvoltage protection circuit comprises a plurality of voltage-dependent resistors, as shown in Figure 2 Each two phases of the alternating current side of the first power conversion module are connected in parallel with a voltage-dependent resistor.

[0043] Specifically, when a transient overvoltage occurs in the circuit, such as high-voltage pulses generated by lightning, start-stop of electrical equipment, electrostatic discharge, etc., the resistance value of the voltage-dependent resistor will decrease rapidly, forming a low-impedance path to limit the overvoltage to a lower level, thereby protecting other elements in the circuit from damage caused by excessive voltage.

[0044] Specifically, a large inrush current may occur at the moment of starting, which may cause impact on the power supply and other elements. The voltage-dependent resistor can suppress the inrush current at the moment of starting, limit the size of the current by changing its resistance value, and protect the circuit elements.

[0045] Specifically, when there is a high-frequency interference signal in the circuit, the voltage-dependent resistor will exhibit different impedance characteristics, thereby absorbing or attenuating the interference signal, reducing the impact of electromagnetic interference on the normal operation of the circuit, and improving the stability and reliability of the circuit.

[0046] In some alternative embodiments, the traction machine system further comprises a sampling circuit and a drive and control circuit, wherein the sampling circuit is configured to collect the first power conversion module AC side voltage and current, bus voltage, and second power conversion module AC side voltage and current; and the drive circuit is configured to generate a control signal of a switch tube in the second power conversion module based on the collected information output by the sampling circuit.

[0047] Specifically, as shown in Figure 2 the three-phase rectifier circuit is a non-controlled rectifier circuit, and the three-phase inverter circuit is a controllable inverter circuit. During power supply to the motor or energy feedback during braking, various electrical parameters are collected, and a preset closed-loop control method is used to realize stable energy output. The preset closed-loop control method is not limited to a double-closed-loop control method of voltage outer loop and current inner loop, but can also be a power-voltage closed-loop control method, a direct-current voltage closed-loop control method, etc., which is not limited herein.

[0048] In some alternative embodiments, the traction machine system further comprises a fault detection circuit configured to detect various fault types of the traction machine system based on the collected information output by the sampling circuit.

[0049] Specifically, the fault types are not limited to open-phase detection, power failure detection, under-voltage detection, over-voltage detection, pump-up voltage detection, ground detection, short-circuit detection, etc.

[0050] It should be noted that the control of the power conversion module and the fault detection method in the present embodiment are both mature methods in the prior art, which will not be described herein.

[0051] In the present embodiment, an elevator is provided, which comprises a traction machine system, a motor, and an elevator body. As shown in Figure 1 the energy storage module has the following functions:

[0052] ① In the case of AC power failure, output DC. ② When the motor is running, discharge when the voltage is higher than the bus voltage output by the first power conversion module, and stop discharging when the voltage is lower than a preset voltage threshold during discharging, and the bus voltage is greater than the preset voltage threshold. ③ When the motor brakes, recover energy.

[0053] As shown in Figure 1The first power conversion module is shown, the AC side is the power access end, the DC side is connected with the DC side of the second power conversion module, and is used for converting the AC power into the bus voltage when the AC power is not powered off.

[0054] As shown in Figure 1 The second power conversion module is shown, the AC side is the motor access end, and is used for converting the bus voltage into the AC power to supply the motor; and when the motor brakes, the braking energy is fed back to the energy storage module. The rotation of the motor realizes the ascending and descending of the elevator body.

[0055] Although the embodiments of the present application are described in conjunction with the drawings, various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the present application, and such modifications and changes fall within the scope defined by the appended claims.

Claims

1. A machine system, characterized by Comprise: a storage module, a first power conversion module, a second power conversion module, wherein, the storage module, the first end of which is connected with the first end of the second power conversion module, is used for outputting direct current in the case of AC power outage, discharging when the voltage of the motor is higher than the bus voltage output by the first power conversion module during the motor driving, and stopping discharging when the voltage is lower than a preset voltage threshold during the discharging process, the bus voltage being higher than the preset voltage threshold; the first power conversion module, the AC side of which is a power supply access end, and the DC side of which is connected with the DC side of the second power conversion module, is used for converting AC power into bus voltage in the case of no AC power outage; the second power conversion module, the AC side of which is a motor access end, is used for converting the bus voltage into AC power to supply power to the motor, and is used for feeding back the braking energy to the storage module when the motor brakes.

2. The machine system according to claim 1, characterized in that, The storage module comprises: a power storage battery, a first relay, a filter inductor and a feedback IGBT, wherein, the power storage battery, the first end of which is connected with the first end of the filter inductor through the first relay, and the second end of which is connected with the second DC end of the second power conversion module; the filter inductor, the second end of which is connected with the emitter of the feedback IGBT; the feedback IGBT, the collector of which is connected with the first DC end of the second power conversion module.

3. The machine system of claim 1, wherein, The first power conversion module comprises: a three-phase rectifier circuit, a support capacitor, a bus capacitor group and a buffer capacitor, wherein, the three-phase rectifier circuit, the AC side of which is a power supply access end, and the DC side of which is connected with the support capacitor, the bus capacitor group and the buffer capacitor in parallel in sequence, and the DC side of which is further connected with the DC side of the second power conversion module.

4. The machine system according to claim 3, characterized in that The first power conversion module further comprises: a soft start circuit arranged between the support capacitor and the bus capacitor group, and the soft start circuit comprises: a resistance branch and a second relay connected in parallel.

5. The machine system of claim 1, wherein, The second power conversion module comprises: a three-phase inverter circuit, wherein, the three-phase inverter circuit, the DC side of which is connected with the DC side of the first power conversion module and the first end of the storage module, and the AC side of which is the motor access end.

6. The machine system according to claim 5, characterized in that The second power conversion module further comprises: a braking circuit connected in parallel with the DC side of the three-phase inverter circuit, and the braking circuit comprises: a first diode and a braking IGBT, wherein, the first diode, the cathode of which is connected with the first DC end of the second power conversion module, and the anode of which is connected with the collector of the braking IGBT; the braking IGBT, the emitter of which is connected with the second DC end of the second power conversion module.

7. The machine system of claim 1, wherein, Further comprise: an overvoltage protection circuit, and the overvoltage protection circuit comprises: a plurality of pressure-sensitive resistors, wherein, one pressure-sensitive resistor is connected in parallel between every two phases of the AC side of the first power conversion module.

8. The machine system of claim 1, wherein, Further comprise: a sampling circuit, a driving and control circuit, wherein, the sampling circuit is used for collecting the AC side voltage and current of the first power conversion module, the bus voltage, and the AC side voltage and current of the second power conversion module; the driving circuit is used for generating the control signal of the switching tube in the second power conversion module based on the collection information output by the sampling circuit.

9. The machine system according to claim 8, characterized in that Also included are: a fault detection circuit for detecting a plurality of fault types of the hoisting machine system based on the collected information output by the sampling circuit.

10. An elevator, characterized by Included are: the hoisting machine system, the motor and the elevator body according to any one of claims 1-9.

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