DC Static On-Off Generator and Its Working Method

Abstract

The present invention provides a DC static on-off generator and its working method. The generator includes an intelligent on-off rectification module for controlling the on-off of the generator's power output; the three-phase windings of the generator stator (10) are connected to controllable thyristors for controlling the on-off of power output; the power output terminals of the three-phase windings are also connected to the input terminals of the rectifier bridge module in the intelligent on-off rectification module (9). The direct current output from the output terminals of the rectifier bridge is connected to a switch control circuit to form a control signal for accessing the K pole and G pole of the controllable thyristor, and the external power output of the generator is turned on or off by controlling the controllable thyristor. The present invention has the advantages of being silent, energy-saving, safe, small in size, long in service life, maintenance-free, and easy to operate.

Description

Technical Field

[0001] The present invention relates to the technical field of generators, in particular to a DC static on-off generator and its working method. Background Art

[0002] The on-off control of the rectified output of traditional DC generators is achieved by using diode rectification and the on-off of contactors. A relatively large independent rectification control cabinet is required to complete this, and the contactor will generate a certain amount of noise and power loss during operation. In addition, the contacts of the contactor are prone to generating sparks during operation, which is not only unsafe but also extremely likely to damage the contacts and reduce the service life of the contactor. Summary of the Invention

[0003] The present invention provides a DC static on-off generator and its working method, which have the advantages of being silent, energy-saving, safe, small in size, long in service life, maintenance-free, and easy to operate.

[0004] The present invention adopts the following technical solutions.

[0005] A DC static on-off generator, the generator includes an intelligent on-off rectification module for controlling the on-off of the generator output power; the three-phase windings of the generator stator (10) are connected to controllable thyristors for controlling the on-off of power output; the power output terminals of the three-phase windings are also connected to the input terminals of the rectifier bridge module in the intelligent on-off rectification module (9), and the direct current output by the rectifier bridge output terminal is connected to the switch control circuit to form a control signal for accessing the K pole and G pole of the controllable thyristor, and the external power output of the generator is turned on or off by controlling the controllable thyristor.

[0006] The controllable thyristor is connected in series with a diode to form three rectifier sub-circuits for rectifying the power output of the generator stator windings to output direct current, and the three rectifier sub-circuits respectively correspond to the three-phase outputs of the generator stator.

[0007] The main body of the generator includes a stator (10), a rotor (11), a machine base (7) and a control box (1); a heat dissipation plate and an intelligent on-off rectification module are installed in the control box; the control signal output terminal of the switch control circuit is connected to the switch control terminal of the intelligent on-off rectification module.

[0008] An aviation socket (2) and a European socket (3) are installed at the rear panel of the control box; the lead-out wires of the three-phase windings of the stator are led out through the wire outlet holes of the machine base and connected to the AC terminals of the intelligent on-off rectification module to transmit electrical energy to the rectifier bridge module; the aviation socket is connected to the on-off switch and the switch control terminal of the intelligent on-off rectification module through a cable;

[0009] The European socket is connected to the DC terminal of the rectification circuit through a cable to transmit the direct current rectified by the rectification circuit to an external load.

[0010] The outgoing line hole is filled and sealed with epoxy resin, and the protection grade of the generator is IP55; a top cover in the shape of a rain cap is provided at the top of the generator.

[0011] The main body of the generator further includes a front end cover (6) and a rear end cover (12); the magnetic poles of the rotor are formed by high-energy product permanent magnets, so that the generator can output electric energy at any rotational speed.

[0012] The three commutation circuit combinations form a three-phase semi-controlled rectifier bridge circuit in the intelligent on-off rectifier module; the switch control circuit controls the thyristors in the three-phase semi-controlled rectifier bridge circuit to perform switch control on the external power supply of the generator.

[0013] The generator is placed on a crane, and the output circuit of the generator is a dedicated power supply circuit for the electromagnet of the crane's lifting mechanism; the electromagnet is a DC electromagnet and belongs to a highly inductive load;

[0014] The generator switch control circuit is externally connected to the on-off switch in the crane control room, and synchronously sends control signals to the K poles and G poles of the controllable thyristors at the three DC rectifier units of the generator, controlling the DC output power of the three DC rectifier units of the generator to the electromagnet, so that the generator does not rely on the contact opening and closing structure, and can completely make the three DC rectifier units quickly synchronously connect or quickly synchronously cut off through the controllable thyristors, avoiding the reverse electromotive force generated by the highly inductive load during on-off from causing an arc.

[0015] The advantages of the present invention are as follows:

[0016] 1. An intelligent on-off rectifier module is adopted, which includes a three-phase semi-controlled rectifier bridge. The switch of the external power supply of the generator is realized by controlling the on-off of the thyristor, and it has the advantages of silent, energy-saving, safe, small volume, long life, maintenance-free, easy to operate, etc.

[0017] 2. The magnetic poles of the rotor are made of high-energy product permanent magnets, which have the advantages of high temperature resistance and large magnetic field strength. Under the drive of the prime mover, the generator can output electric energy at any rotational speed from low speed to high speed. Therefore, the rotational speed of the prime mover can be adjusted according to the load size, thereby improving the energy conversion efficiency of the prime mover; at the same time, there is no excitation loss of the traditional electric excitation generator, improving the efficiency.

[0018] 3. The protection level of this DC static on-off generator is IP55. Coupled with the rainproof cap-style top cover design, the generator is fully capable of withstanding the harsh outdoor environment with a lot of dust. Since the rotor magnetic field of the generator is generated by high-energy product permanent magnets, this DC static on-off generator can output direct current at any rotational speed. Therefore, when the generator is driven by a hydraulic motor, the rotational speed of the hydraulic motor can be adjusted according to the load size. Combining with the static on-off function of the three-phase intelligent on-off rectification module, it is very easy to control the start and stop of the load device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments:

[0020] FIG Figure 1 is the front schematic diagram of the present invention;

[0021] FIG Figure 2 is the sectional schematic diagram of the present invention;

[0022] FIG Figure 3 is the electrical principle schematic diagram of the present invention;

[0023] In the figures: 1 - control box; 2 - aviation socket; 3 - European socket; 4 - rear cover; 5 - lifting lug; 6 - front end cover; 7 - machine base; 8 - heat dissipation plate; 9 - intelligent on-off rectification module; 10 - stator; 11 - rotor; 12 - rear end cover; 13 - bearing; 14 - fan. SPECIFIC EMBODIMENTS

[0024] As shown in the figure, for the DC static on-off generator, the generator includes an intelligent on-off rectification module for controlling the on-off of the generator output power; the three-phase windings of the generator stator 10 are connected to thyristors for controlling the on-off of the power output; the power output terminals of the three-phase windings are also connected to the input terminals of the rectifier bridge module in the intelligent on-off rectification module 9, and the direct current output by the rectifier bridge output terminals is connected to the switch control circuit to form a control signal for accessing the K pole and G pole of the thyristor, and the external power output of the generator is turned on or off by controlling the thyristor.

[0025] The thyristor is connected in series with a diode to form three commutation sub-circuits for rectifying the power output of the generator stator windings to output direct current, and the three commutation sub-circuits respectively correspond to the three-phase outputs of the generator stator.

[0026] The main body of the generator includes a stator 10, a rotor 11, a machine base 7 and a control box 1; a heat dissipation plate and an intelligent on-off rectification module are installed in the control box; the control signal output terminal of the switch control circuit is connected to the switch control terminal of the intelligent on-off rectification module.

[0027] An aviation socket 2 and a European-style socket 3 are installed at the rear panel of the control box; the lead wires of the three-phase windings of the stator are led out through the wire outlet holes of the machine base and connected to the AC terminals of the intelligent on-off rectification module to transmit electric energy to the rectifier bridge module; the aviation socket is connected to the on-off switch and the switch control terminals of the intelligent on-off rectification module through a cable.

[0028] The European-style socket is connected to the DC terminals of the rectification circuit through a cable to transmit the direct current rectified by the rectification circuit to an external load.

[0029] The wire outlet holes are filled and sealed with epoxy resin, and the protection grade of the generator is IP55; a top cover in the shape of a rain cap is provided at the top of the generator.

[0030] The main body of the generator further includes a front end cover 6 and a rear end cover 12; the magnetic poles of the rotor are formed by high-energy product permanent magnets, enabling the generator to output electric energy at any rotational speed.

[0031] The three commutation circuit combinations form a three-phase semi-controlled rectifier bridge circuit in the intelligent on-off rectification module; the switch control circuit controls the thyristors in the three-phase semi-controlled rectifier bridge circuit to perform switch control on the external power supply of the generator.

[0032] The generator is placed on a crane, and the generator output circuit is a dedicated power supply circuit for the electromagnet of the crane lifting mechanism; the electromagnet is a DC electromagnet and belongs to a highly inductive load.

[0033] The generator switch control circuit is externally connected to the on-off switch in the crane control room to synchronously send control signals to the K poles and G poles of the controllable thyristors at the three DC rectification units of the generator, controlling the DC output power of the three DC rectification units of the generator to the electromagnet, enabling the generator to not rely on the contact opening and closing structure and being able to completely and quickly synchronously connect or quickly synchronously cut off the three DC rectification units through the controllable thyristors, avoiding the reverse electromotive force generated by the highly inductive load during on-off from causing electric arcs.

[0034] Embodiment:

[0035] In this example, the DC static on-off generator uses high-energy product permanent magnets to form the magnetic field for electromechanical energy conversion. The multi-pole rotor embedded with the permanent magnets is driven by a high-speed prime mover to output medium-frequency three-phase electricity with a relatively high frequency, and then it is rectified by a three-phase intelligent on-off rectification module to output direct current for DC electrical equipment.

[0036] An aviation socket is externally connected to an on-off switch K2, and the on-off switch controls the control signals accessing the K poles and G poles of the controllable thyristors to perform synchronous on-off control on the output power of the three phases of the generator.

Claims

1. DC static on-off generator, characterized in that: The generator includes an intelligent on-off rectification module for controlling the on-off of the generator output power; the three-phase windings of the generator stator (10) are connected to controllable thyristors for controlling the on-off of power output; the power output terminals of the three-phase windings are also connected to the input terminals of the rectifier bridge module in the intelligent on-off rectification module (9), and the direct current output by the rectifier bridge output terminals is connected to the switch control circuit to form a control signal for accessing the K pole and G pole of the controllable thyristor, and the external power output of the generator is turned on or off by controlling the controllable thyristor; The controllable thyristor is connected in series with a diode to form three commutation sub-circuits for rectifying the power output of the generator stator windings to output direct current, and the three commutation sub-circuits respectively correspond to the three-phase outputs of the generator stator; The main body of the generator includes a stator (10), a rotor (11), a frame (7) and a control box (1); a heat dissipation plate and an intelligent on-off rectification module are installed in the control box; the control signal output terminal of the switch control circuit is connected to the switch control terminal of the intelligent on-off rectification module; The main body of the generator also includes a front end cover (6) and a rear end cover (12); the magnetic poles of the rotor are formed by high-energy product permanent magnets, so that the generator can output electric energy at any speed; The three commutation sub-circuits are combined into a three-phase semi-controlled rectifier bridge circuit in the intelligent on-off rectification module; the switch control circuit controls the thyristors in the three-phase semi-controlled rectifier bridge circuit to perform switch control on the external power supply of the generator; A working method of a DC static on-off generator, the generator is placed on a crane, and the generator output circuit is a dedicated power supply circuit for the electromagnet of the crane hoisting mechanism; the electromagnet is a DC electromagnet and belongs to a highly inductive load; The generator switch control circuit is externally connected to the on-off switch in the crane control room, and synchronously sends control signals to the K pole and G pole of the controllable thyristors at the three DC rectification units of the generator, controls the DC output power of the three DC rectification units of the generator to the electromagnet, so that the generator does not rely on the contact opening and closing structure, and can completely make the three DC rectification units quickly synchronously connect or quickly synchronously cut off through the controllable thyristors, avoiding the reverse electromotive force caused by the highly inductive load during on-off from generating an arc; The generator is driven by the hydraulic motor of the crane, and the speed of the hydraulic motor is adjusted according to the size of the electromagnet load, and the static on-off function of the three-phase intelligent on-off rectification module is cooperated to control the start and stop of the load equipment.

2. The DC static on-off generator according to claim 1, wherein: An aviation socket (2) and a European socket (3) are installed at the rear panel of the control box; the lead-out wires of the three-phase windings of the stator are led out through the wire outlet holes of the frame and connected to the AC terminals of the intelligent on-off rectification module to transmit electric energy to the rectifier bridge module; the aviation socket is connected to the on-off switch and the switch control terminal of the intelligent on-off rectification module through a cable; The European socket is connected to the DC terminal of the rectification circuit through a cable to transmit the direct current rectified by the rectification circuit to the external load.

3. The DC static on-off generator according to claim 2, characterized in that: The wire outlet holes are filled and sealed with epoxy resin, and the protection grade of the generator is IP55; a rain-proof cap-shaped top cover is provided at the top of the generator.

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