CN217282587U - Generator with low ripple output voltage - Google Patents
Generator with low ripple output voltage Download PDFInfo
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- CN217282587U CN217282587U CN202221251497.0U CN202221251497U CN217282587U CN 217282587 U CN217282587 U CN 217282587U CN 202221251497 U CN202221251497 U CN 202221251497U CN 217282587 U CN217282587 U CN 217282587U
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Abstract
The utility model provides a low ripple output voltage's generator, generator include heterogeneous motor, rectifier module and generator output. The multiphase motor is used for generating multi-path alternating voltage. The rectifying module is used for rectifying the multi-path alternating-current voltage to generate corresponding direct-current low-ripple voltage. The output end of the generator is used for outputting direct-current low ripple voltage and comprises a positive output end and a negative output end. The multi-phase motor comprises a stator arranged on the outer side of the multi-phase motor and a rotor arranged inside the multi-phase motor. The inner side of the stator is uniformly provided with N windings with coils connected in parallel, and the rotor comprises N magnetic poles and S magnetic poles which are symmetrically arranged; wherein n is a positive integer greater than 3. The rectifying module comprises a plurality of unidirectional conducting devices, wherein the unidirectional conducting devices correspond to the windings one to one. One end of each of the coils of the n windings is connected with the equal negative output end, and the other end of each of the coils of the n windings is connected with the positive output end through the one-way conduction device.
Description
Technical Field
The utility model relates to a generator technical field, in particular to low ripple output voltage's generator.
Background
The working principle of the generator is as follows: through the rotation of the motor rotor, the magnetic flux of the coil on the stator can be changed periodically, and according to the Faraday electromagnetic induction phenomenon, the coil can induce a voltage which is changed correspondingly, namely, an alternating current is generated. The stator is the stationary part of the machine, usually the generating coil. The rotor is the rotating part of the machine, usually a permanent magnet or a field coil. The main function of the rotor is to generate a rotating magnetic field, and the main function of the stator is to be cut by magnetic lines of force in the rotating magnetic field to generate (output) induced voltage.
The generator in the prior art is generally a single-phase motor or a three-phase motor (fig. 2 shows a three-phase motor), the ripple voltage of the output direct current voltage or alternating current voltage is large, and when the effective value of the output voltage meets the requirement of the battery cell, the maximum value of the output voltage seriously exceeds the specification of the battery cell, and the battery cell is damaged. The ripple voltage is the difference between the peak and the trough of the output voltage. Therefore, the generator in the prior art cannot be directly used for charging the battery, and an external direct current charger or an alternating current charger is generally used for charging the battery. For example, fig. 1, which is a combination charging method of a conventional alternator and an ac charger. The motor rotates to generate alternating voltage, the alternating voltage is changed into high-voltage direct current voltage through the rectifying module, 110 Vac-220 Vac or 380Vac alternating current is generated through the inverter module, and then an external alternating current charger charges the battery.
Therefore, it is desirable to provide a generator with low ripple output voltage to solve the above technical problems.
SUMMERY OF THE UTILITY MODEL
The utility model provides a low ripple output voltage's generator to solve the great technical problem of the direct current voltage of the generator output among the prior art or alternating voltage's ripple voltage.
In order to solve the technical problem, the utility model adopts the technical scheme that:
a low ripple output voltage generator for charging a battery, the generator comprising:
a multi-phase motor for generating a multi-path alternating voltage;
the rectifying module is used for rectifying the multi-path alternating-current voltage to generate corresponding direct-current low-ripple voltage; and the number of the first and second groups,
the generator output end is used for outputting the direct-current low ripple voltage and comprises a positive output end and a negative output end;
wherein the multi-phase electric machine comprises a stator disposed outside the multi-phase electric machine and a rotor disposed inside the multi-phase electric machine;
the inner side of the stator is uniformly provided with N windings with coils connected in parallel, and the rotor comprises N magnetic poles and S magnetic poles which are symmetrically arranged; wherein n is a positive integer greater than 3;
the rectifying module comprises a plurality of unidirectional conducting devices, wherein the unidirectional conducting devices correspond to the windings one by one;
one end of each of the n windings is connected with the negative output end, and the other end of each of the n windings is connected with the positive output end through the one-way conduction device.
In the generator with low ripple output voltage, n is 4-8.
Low ripple output voltage's generator in, the stator includes yoke portion and tooth portion, yoke portion is both ends open-ended tubular structure, the external diameter of yoke portion is 150mm-300mm, the internal diameter of yoke portion is 100mm-250mm, the tooth portion is followed the radial protrusion in of yoke portion in the inside wall of yoke portion, the width of tooth portion is 10mm-20mm, the length of tooth portion is 15mm-30mm, the height of tooth portion is 10mm-20mm, and is a plurality of tooth portion sets up to central symmetry, every all the winding has the coil of the same length on the tooth portion, forms the winding.
Low ripple output voltage's generator in, tooth portion orientation the surface of rotor sets up to sunken arc surface, the rotor orientation the surface of tooth portion sets up to convex arc surface.
Low ripple output voltage's generator in, the unidirectional flux device is fast recovery diode.
Low ripple output voltage's generator in, the generator still includes control module, its with heterogeneous motor rectifier module with the battery is all connected, control module is through reading the charged state of battery, thereby dynamic adjustment heterogeneous motor with rectifier module's output voltage and output current.
Low ripple output voltage's generator in, the generator still includes the switch, it is connected rectifier module with between the generator output, control module basis the state of battery, control the state of switch.
Low ripple output voltage's generator in, the switch sets up to MOS switch or relay switch.
Low ripple output voltage's generator in, the generator still includes the filtering module, it is connected the rectifier module with between the generator output end, the filtering module is used for reducing the rectifier module output the ripple of the low ripple voltage of direct current.
Low ripple output voltage's generator in, filter module is LC type filter circuit or pi type filter circuit.
The utility model discloses compare in prior art, its beneficial effect is: the utility model discloses a low ripple output voltage's generator, it is through setting up heterogeneous motor into n windings, wherein n is for being greater than 3 positive integer, thereby make the less multichannel alternating voltage of heterogeneous motor output phase difference, the coil of n windings of rethread is parallelly connected, and the one end of the coil of n windings all is connected with the negative-going output, the other end of the coil of n windings is connected with the positive-going output through the one-way device that switches on respectively, because the difference of phase place, can carry out voltage complementation between the windings, alright output can directly give the direct current output voltage that the battery charged after the rectification, and produce the low ripple voltage of direct current.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments are briefly described below, and the drawings in the following description are only corresponding drawings of some embodiments of the present invention.
Fig. 1 is a schematic block diagram of a combined charging of an alternator and an ac charger according to the prior art.
Fig. 2 is a schematic structural diagram of a three-phase motor in the prior art.
Fig. 3 is a schematic structural block diagram of a generator according to a first embodiment of the present invention.
Fig. 4 is a circuit diagram of a rectifier module of a generator according to a first embodiment of the present invention.
Fig. 5 is a schematic structural diagram of a multiphase motor of a generator according to a first embodiment of the present invention.
Fig. 6 is a schematic diagram of a plurality of ac voltages before rectification in the generator according to the first embodiment of the present invention.
Fig. 7 is a schematic diagram of a rectified voltage waveform of the generator according to the first embodiment of the present invention.
Fig. 8 is a schematic structural block diagram of a generator according to a second embodiment of the present invention.
Fig. 9 is a circuit diagram of a filter module of a generator according to a second embodiment of the present invention.
Fig. 10 is a flowchart of a first embodiment of a generator configuration method according to the present invention.
Fig. 11 is a flowchart of a second embodiment of a generator configuration method according to the present invention.
Wherein the content of the first and second substances,
the labels of fig. 3, 4 and 5 are as follows:
100. a battery pack having a plurality of batteries,
11. a multi-phase motor is provided with a plurality of phases,
111. a stator which is provided with a plurality of stator coils,
1111. winding 1112, yoke 1113, tooth,
112. the rotor is provided with a plurality of rotor blades,
12. a rectifying module 121, a unidirectional conducting device,
13. the output end of the generator is connected with the power supply,
131. a positive output terminal, 132, a negative output terminal,
14. a control module for controlling the operation of the electronic device,
15. and (4) switching.
The labels of FIG. 8 are as follows:
21. a multi-phase electric motor is provided,
22. a rectification module for rectifying the voltage of the power supply,
23. the output end of the generator is connected with the power supply,
24. and a filtering module.
In the drawings, elements having similar structures are denoted by the same reference numerals.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative efforts all belong to the protection scope of the present invention.
In the present invention, the directional terms, such as "up", "down", "front", "back", "left", "right", "inner", "outer", "side", "top" and "bottom", refer to the orientation of the drawings, and the directional terms are used for illustration and understanding, but not for limiting the present invention.
The terms "first," "second," and the like in the terms of the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance, nor should they be construed as limiting in any way.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
The generator in the prior art is generally a single-phase motor or a three-phase motor, the ripple voltage of the output direct-current voltage or alternating-current voltage is large, and when the effective value of the output voltage meets the requirement of the battery cell, the maximum value of the output voltage seriously exceeds the specification of the battery cell, and the battery cell can be damaged.
The present invention provides a preferred embodiment of a generator with low ripple output voltage, which can solve the above technical problems.
Referring to fig. 3, fig. 4 and fig. 5, a first embodiment of a generator with low ripple output voltage is provided for charging the battery 100. The generator comprises a multiphase motor 11, a rectifier module 12 and a generator output 13. The multiphase motor 11 is used to generate multiple ac voltages. The rectifying module 12 is configured to perform a rectifying operation on the multiple paths of alternating voltages to generate corresponding direct-current low ripple voltages. The generator output terminal 13 is used for outputting a dc low ripple voltage, and the generator output terminal 13 includes a positive output terminal 131 and a negative output terminal 132.
The multiphase motor 11 includes a stator 111 disposed outside the multiphase motor 11 and a rotor 112 disposed inside the multiphase motor 11. The inside of the stator 111 is uniformly provided with n windings 1111, and the coils of the n windings 1111 are connected in parallel, wherein n is a positive integer greater than 3. The rotor 112 includes N and S magnetic poles arranged symmetrically. Illustrated in fig. 5 is the case where n is six, i.e. the polyphase motor 11 comprises six windings.
The rectifying module 12 includes a plurality of unidirectional conducting devices 121, where the unidirectional conducting devices 121 correspond to the windings 1111 one to one. One end of each of the coils of the n windings 1111 is connected to the negative output terminal 132, and the other end of each of the coils of the n windings 1111 is connected to the positive output terminal 131 through the unidirectional conducting device 121. In fig. 4, six unidirectional conducting devices 121 are illustrated.
Taking a six-phase motor as an example, fig. 6 shows six ac voltages induced by the six-phase motor, the six ac voltages are rectified by the rectifying module to become waveforms shown in fig. 7, and the rectified six ac voltages are superimposed to become a dc output voltage (not shown in the figure) with a smaller waveform. The ripple voltage is the difference between the peak and the trough of the varying dc output voltage. The ripple ratio represents the stability index of the rectified dc output voltage, and is the ratio of the ripple voltage to the output voltage. When the output voltage is a fixed value, the ripple voltage is smaller, the ripple proportion is smaller, and the more stable the direct-current output voltage is. Taking a sine wave as an example, the ripple ratio corresponding to different phases in the above structure is shown below, and it can be seen that the ripple ratio is smaller as the number of phases is larger.
| Number of phases | 3 phase (C) | 4 phase of | Phase 5 | 6 phases of | 7 phase | 9 |
11 |
13 phase (C) | 14 phase |
| Ripple ratio | 0.5 | 0.293 | 0.191 | 0.134 | 0.101 | 0.060 | 0.044 | 0.030 | 0.026 |
The utility model discloses a generator with low ripple output voltage, which arranges a multi-phase motor 11 into n windings 1111, where n is a positive integer greater than 3, so that the multi-phase motor 11 outputs a plurality of ac voltages (6 ac voltages, as shown in fig. 6) having a small phase difference, and then the coils of the n windings 1111 are connected in parallel, and one end of each of the coils of the n windings 1111 is connected to the negative output terminal 132, the other end of each of the coils of the n windings 1111 is connected to the positive output terminal 131 through the unidirectional conducting device 121, because of the phase difference, windings 1111 may be voltage-complemented to raise the lowest voltage, thereby lowering the difference between the lowest voltage and the highest voltage, further, the ripple is reduced, and the rectified dc output voltage can be used to directly charge the battery 100, and a dc low ripple voltage (as shown in fig. 7, a waveform obtained by rectifying 6 ac voltages) is generated. The utility model discloses a low ripple output voltage's generator, it does not need external direct current charger or alternating current charger, can directly charge to battery 100.
Referring to fig. 5, n may be set to 4-8, that is, the number of windings is set to 4-8, which is illustrated as 6. The structure can output direct current low ripple voltage meeting general requirements, and is convenient for winding coils.
Referring to fig. 5, the stator 111 includes a yoke 1112 and a tooth 1113, and the yoke 1112 has a cylindrical structure with two open ends. Typically, the space to accommodate the multiphase motor 11 is limited. The yoke 1112 has an outer diameter of 150mm to 300mm and the yoke 1112 has an inner diameter of 100mm to 250 mm. The tooth portion 1113 protrudes from the inner sidewall of the yoke 1112 in the radial direction of the yoke 1112. The width of the tooth 1113 is 10mm to 20 mm. The length of the tooth part 1113 is 15mm-30mm, and the length of the tooth part 1113 is the dimension of the tooth part 1113 extending towards the rotor 112. The height of the tooth portion 1113 is 10mm to 20mm, and the height of the tooth portion 1113 is the dimension of the tooth portion 1113 extending in the axial direction of the yoke portion 1112. The plurality of tooth portions 1113 are centrosymmetric, and each tooth portion 1113 is wound with a coil of the same length to form a winding 1111. This structure can effectively utilize the inside space of yoke portion 1112, under the prerequisite of guaranteeing to hold the rotor 112 of certain size, makes the size maximize of tooth 1113, can twine longer coil to satisfy great output voltage's demand.
With continued reference to fig. 5, the surface of the tooth portion 1113 facing the rotor 112 is configured as a concave arc surface, and the surface of the rotor 112 facing the tooth portion 1113 is configured as a convex arc surface. The structure can effectively utilize limited space to meet the condition that the required output voltage and output power are large.
Referring to fig. 4, the unidirectional conducting device 121 is a fast recovery diode. The fast recovery diode has high reverse voltage resistance and short reverse recovery time, so that the fast recovery diode is not easy to damage when the output voltage is high, and a circuit can be effectively protected.
Referring to fig. 3, the generator further includes a control module 14, which is connected to the multiphase motor 11, the rectifier module 12 and the battery 100, and the control module 14 reads the charging state of the battery 100, so as to dynamically adjust the output voltage and the output current of the multiphase motor 11 and the rectifier module 12.
With continued reference to fig. 3, the generator further includes a switch 15 connected between the rectifier module 12 and the generator output 13, and the control module 14 controls a state of the switch 15 according to a state of the battery 100.
In the above structure, the control module 14 includes an MCU, the MCU sets the output voltage of the generator by reading the state of the battery 100 to be charged and then sending an instruction to the generator voltage regulation control unit, and after the generator is set, the MCU turns on the switch 15, and at this time, the generator charges the battery normally. When the MCU detects an abnormality (e.g., over-temperature of the generator, over-temperature of the battery, etc.) or the battery is fully charged, the switch 15 is turned off to disconnect the generator from the battery 100. The output power of the generator is adjusted according to the battery state, and the generator can be adjusted to be in a standby state in the scene that no battery is inserted or the battery is fully charged, so that the fuel consumption is further reduced.
The switch 15 is configured as a MOS switch or a relay switch. The MOS tube has low loss and better temperature control characteristics (heat conduction and heat generation), a small driving signal can control a large power circuit, and the use is convenient. The relay has high sensitivity, small control power and good electromagnetic compatibility.
Referring to fig. 8 and 9, a second embodiment of a generator with low ripple output voltage is provided. The generator of the present embodiment comprises a multiphase motor 21, a rectification module 22, and a generator output 23, and unlike the generator of the first embodiment, the generator of the present embodiment further comprises a filtering module 24 connected between the rectification module 22 and the generator output 23. When the ripple of the required output voltage is smaller, the filtering module 24 may further reduce the ripple of the dc low ripple voltage output by the rectifying module 12 to meet the higher requirement.
The filter module 22 is an LC type filter circuit or a Π type filter circuit. In fig. 9, an LC type filter circuit is illustrated. Both circuits can output voltage with low ripple factor.
The more the number n of windings of the multi-phase motor is, the smaller the output ripple voltage is, but the difficulty of processing and winding is increased correspondingly. Therefore, the problem exists in how to select the number n of windings, so that the minimum number n of windings is selected on the premise that the generator meets the required ripple voltage, and the processing difficulty and the winding difficulty are reduced to the minimum.
The present invention provides a preferred embodiment of a generator configuration method capable of solving the above technical problems.
Referring to fig. 10, a first embodiment of a generator configuration method according to the present invention is shown. When the space for accommodating the multiphase motor 11 is not limited, the generator adopts the structure of fig. 3. The generator comprises a multiphase motor 11, a rectification module 12 and a generator output end 13 which are connected in sequence, and the generator configuration method comprises the following steps:
s1, setting the output voltage of the generator and setting the ripple voltage of the output voltage;
s2, determining the set ripple proportion of the generator based on the output voltage and the set ripple voltage; and the number of the first and second groups,
s3, the number of phases to be set and arranged of the multi-phase motor 11 is determined based on the set ripple ratio.
The output voltage refers to a direct current voltage which is finally output by the generator to drive a load, such as a voltage between the positive output terminal 131 and the negative output terminal 132 in fig. 3. The set ripple voltage is the difference between the peak and the trough of the output voltage. The ripple ratio is set by setting the ratio of the ripple voltage to the output voltage. The number of phases to be arranged is set to an ideal number of phases of the multiphase motor in a case where the output voltage and the set ripple voltage are satisfied, and space restrictions are not taken into consideration. The output voltage is generally determined according to the battery capacity and the charging time. The set ripple voltage can be obtained by subtracting the output voltage value from the maximum value which can be borne by the battery core.
The utility model discloses a generator configuration method can confirm to set for the ripple proportion through the output voltage who sets for and the output voltage's of setting for ripple voltage earlier, then through setting for the ripple proportion, confirms the configuration looks number of setting for of heterogeneous motor for the ripple voltage of generator output satisfies the demand, can directly charge for the battery.
Step S2 is to determine the set ripple ratio of the generator according to the following formula:
Va*2 1/2 *E＝Vpp；
where Va is the output voltage, Vpp is the set ripple voltage, and E is the set ripple ratio. The method can accurately calculate the set ripple ratio of the generator.
Step S3 is determining the number of phases to be configured for the multiphase motor according to the following equation:
E＝1-sin(90°-180°/N)；
wherein, E is the set ripple ratio, and N is the set configuration phase number. The method can accurately calculate the set configuration phase number of the multi-phase motor.
In general, the space for accommodating the multi-phase motor is limited, the multi-phase motor cannot be made large without limitation, and the number of configured phases of the multi-phase motor cannot be set too much.
Referring to fig. 11, a second embodiment of a generator configuration method according to the present invention is provided. The generator arranging method of the present embodiment is different from the generator arranging method of the first embodiment in that the generator arranging method of the present embodiment includes, in addition to step S1, step S2, and step S3 of the first embodiment, the steps of:
s4, acquiring the maximum configuration phase number of the multi-phase motor; and the number of the first and second groups,
s5, comparing the maximum configuration phase number with the set configuration phase number; if the maximum configuration phase number is larger than or equal to the set configuration phase number, setting the actual configuration phase number of the generator according to the set configuration phase number; and if the maximum configuration phase number is less than the set configuration phase number, setting the actual configuration phase number of the generator according to the maximum configuration phase number. The maximum number of configured phases is the maximum number of phases which can be set by the multi-phase motor by comprehensively considering the internal and external spaces of the multi-phase motor and the winding process.
Referring to fig. 5, the multi-phase motor 11 includes a stator 111 disposed outside the multi-phase motor 11 and a rotor 112 disposed inside the multi-phase motor 11. The plurality of windings 1111 are uniformly disposed inside the stator 111, the plurality of windings 1111 surround the rotating space 113, the rotor 112 is disposed in the rotating space 113, and the step S4 includes the steps of:
s41: obtaining the width of winding 1111 (the width of winding 1111 is the total width of winding 1113 around the coil);
s42: obtaining the minimum spacing between the ends of adjacent windings 1111 near the rotor 112;
s43: acquiring the section diameter of the rotating space 113;
s44: acquiring the maximum number of configured phases of the multi-phase motor 11 by the following formula;
M＝Π*D/(W+H)；
wherein pi is 3.14, M is the maximum number of phases configured, D is the diameter of the cross section of the rotation space, W is the width of the windings 1111, and H is the minimum distance between the windings 1111. The method can simply and accurately calculate the maximum configuration phase number of the multi-phase motor 11.
Taking fig. 2 as an example, D is the cross-sectional diameter of the rotation space, W is the width of the windings, and H is the minimum spacing between the windings.
Step S41 is to set the output power of the generator and determine the width of winding 1111 based on the output power and the output voltage. The method can simply and accurately calculate the width of the winding 1111, wherein the number of turns of the coil is required to be more when the output voltage is higher, and the diameter of the coil is required to be larger when the output power is higher.
The actual number of phases configured is set at the maximum number of phases configured in step S5, and the generator is as shown in fig. 8. The generator further comprises a filtering module 24 connected between the rectifying module 22 and the generator output 23. The following steps are also included after step S5:
s6, determining the intermediate ripple ratio of the generator based on the actual configuration phase number and the output voltage;
s7, determining the intermediate ripple voltage output by the rectifying module 12 based on the intermediate ripple proportion;
s8, determining a parameter value of the filtering module 16 based on the intermediate ripple voltage and the set ripple voltage.
As shown in fig. 8, the rectifying module 22 rectifies the multi-path ac voltage and outputs a fluctuating intermediate dc voltage, where the intermediate ripple voltage is a difference between a peak and a trough of the intermediate dc voltage. The intermediate ripple ratio is a ratio of the intermediate ripple voltage to the intermediate dc voltage. And the parameter values of the intermediate ripple voltage filtering module are the parameters of the capacitor and the inductor in the filtering module.
The filtering module 16 is an LC filtering circuit, and the step S8 includes the following steps:
s81, setting the frequency of the generator;
s82, determining the parameter value of the filtering module 16 by the following formula:
Vpp＝Vp/(1+8*f 2 *L*C)；
wherein Vpp is a set ripple voltage, Vp is a middle ripple voltage, f is a frequency of the generator, L is an inductance value of the filtering module 16, and C is a capacitance value of the filtering module 16. The parameters of the circuit can be made to meet the requirements by adjusting the frequency, inductance value or capacitance value of the generator.
In step S82, the inductance of the filter module 16 is set to 0.5uH-1 uH. In a power application scenario, the inductance is low in a limited volume because the inductance requires too much current.
Step S6 is determining the intermediate ripple ratio of the generator according to the following formula:
F＝1-sin(90°-180°/M)；
wherein, F is the intermediate ripple ratio, and M is the actual configuration phase number.
In step S7, the intermediate ripple voltage output by the rectifier module 12 is determined according to the following formula:
Va*2 1/2 *F＝Vp；
wherein Va is the output voltage, F is the middle ripple proportion, and Vp is the middle ripple voltage.
Example 1:
1. setting the output voltage of the generator to be 80V, and setting the ripple voltage of the output voltage to be 2.4V;
2. according to formula Va × 2 1/2 E is equal to Vpp, the output voltage Va is 80V, the ripple voltage Vpp is set to 2.4V, and the ripple ratio E is set to 0.021;
3. according to the formula E, the ripple ratio E is 0.021 and the set configuration phase number N is 15 phases according to 1-sin (90-180 degrees/N);
4. calculating the width of the winding to be 30mm according to the output power and the output voltage;
5. the minimum spacing between the ends of adjacent windings near the rotor (i.e., the winding ends) is 10mm, and a size smaller than this size will not allow a coil to be wound;
6. according to a formula M ═ Π D/(W + H), ═ 3.14, the diameter D of the cross section of the rotating space is 250mm, the width W of the windings is 30mm, the minimum distance H between one ends (namely winding ends) of the adjacent windings close to the rotor is 10mm, and the maximum configuration phase number M of the multi-phase motor is calculated to be 19;
7. the maximum configuration phase number M of the multi-phase motor is 19 groups which are larger than the set configuration phase number N of the multi-phase motor is 15, and the actual configuration phase number of the generator can be set to be 15.
Example 2:
1. setting the output voltage of the generator to be 80V, and setting the ripple voltage of the output voltage to be 2.4V;
2. according to formula Va x 2 1/2 E is equal to Vpp, the output voltage Va is 80V, the ripple voltage Vpp is set to 2.4V, and the ripple ratio E is set to 0.021;
3. according to the formula E, the ripple ratio E is 0.021 and the set configuration phase number N is 15 phases according to 1-sin (90-180 degrees/N);
4. assuming that the maximum configuration phase number M of the multiphase motor is obtained as 12 groups, the maximum configuration phase number 12 of the multiphase motor is smaller than the set configuration phase number 15, and the actual configuration phase number of the generator may be set to 12;
5. according to a formula F, 1-sin (90-180 degrees/M), the actual configuration phase number M of the generator is 12, and the intermediate ripple ratio F is calculated to be 0.034;
6. according to formula Va × 2 1/2 F ═ Vp, the intermediate ripple ratio F is 0.034, the output voltage Va is 80V, and the intermediate ripple voltage Vp is calculated to be 3.8V;
7. according to the formula Vpp ═ Vp/(1+8 f- 2 L C), the frequency f of the generator is 1000Hz, the ripple voltage Vpp is set to 2.4V, the intermediate ripple voltage Vp is set to 3.8V, and L C is calculated to 7.3 x 10 -8 In a power application scenario, the inductance value is low in a finite volume, generally about 0.5uH, because the inductance needs an excessive current, where L is 1uH 110 -6 H, so the capacitance C is 73000 uF. When the actual configuration phase number M of the generator is 12 phases, an LC filter circuit is added, L is 1uH, the capacitance is 73000uF, the output ripple voltage can be reduced to 2.4V, and the design requirement is met.
The utility model discloses a low ripple output voltage's generator, it is through setting up heterogeneous motor into n windings, wherein n is for being greater than 3 positive integer, thereby make the less multichannel alternating voltage of heterogeneous motor output phase difference, the coil of n windings of rethread is parallelly connected, and the one end of the coil of n windings all is connected with the negative-going output, the other end of the coil of n windings is connected with the positive-going output through the one-way device that switches on respectively, because the difference of phase place, can carry out voltage complementation between the winding, alright output can directly give the low ripple voltage of direct current that the battery charges after the rectification. The utility model discloses a low ripple output voltage's generator, it does not need external direct current charger or alternating current charger, can directly charge to the battery, has both reduced the cost of the equipment of using the generator, can improve the charge time again.
The utility model discloses a generator configuration method can be earlier through the output voltage who sets for and the ripple voltage of setting for of the output voltage who sets for, confirms to set for the ripple proportion, then through setting for the ripple proportion, confirms the setting for configuration phase number of heterogeneous motor for the ripple voltage of generator output satisfies the demand, can directly charge for the battery.
In summary, although the present invention has been disclosed with reference to the preferred embodiments, the scope of the present invention is not limited thereto, and any person skilled in the art can substitute or change the technical solution of the present invention within the technical scope of the present invention.
Claims (10)
1. A low ripple output voltage generator for charging a battery, the generator comprising:
a multi-phase motor for generating a multi-path alternating voltage;
the rectifying module is used for rectifying the multi-path alternating-current voltage to generate corresponding direct-current low-ripple voltage; and the number of the first and second groups,
the generator output end is used for outputting the direct-current low ripple voltage and comprises a positive output end and a negative output end;
wherein the multi-phase electric machine comprises a stator disposed outside the multi-phase electric machine and a rotor disposed inside the multi-phase electric machine;
the inner side of the stator is uniformly provided with N windings with coils connected in parallel, and the rotor comprises N magnetic poles and S magnetic poles which are symmetrically arranged; wherein n is a positive integer greater than 3;
the rectifying module comprises a plurality of unidirectional conducting devices, wherein the unidirectional conducting devices correspond to the windings one by one;
one end of each of the n windings is connected with the negative output end, and the other end of each of the n windings is connected with the positive output end through the one-way conduction device.
2. The low-ripple output voltage generator of claim 1, wherein n is 4-8.
3. The generator with low ripple output voltage according to claim 1, wherein the stator comprises a yoke and teeth, the yoke has a cylindrical structure with two open ends, the yoke has an outer diameter of 150mm to 300mm, the yoke has an inner diameter of 100mm to 250mm, the teeth protrude from an inner sidewall of the yoke in a radial direction of the yoke, the teeth have a width of 10mm to 20mm, the teeth have a length of 15mm to 30mm, the teeth have a height of 10mm to 20mm, the teeth are arranged to be symmetrical about a center, and each tooth has a coil wound thereon to form the winding.
4. The low-ripple output voltage generator of claim 3, wherein the surface of the teeth facing the rotor is configured as a concave circular arc surface, and the surface of the rotor facing the teeth is configured as a convex circular arc surface.
5. The low-ripple output voltage generator of claim 1, wherein the unidirectional conducting device is a fast recovery diode.
6. The low-ripple output voltage generator of claim 1, further comprising a control module connected to the multiphase motor, the rectifier module and the battery, the control module dynamically adjusting the output voltage and the output current of the multiphase motor and the rectifier module by reading a state of charge of the battery.
7. The low-ripple output voltage generator of claim 6, further comprising a switch connected between the rectification module and the generator output, wherein the control module controls a state of the switch based on a state of the battery.
8. The low-ripple output voltage generator of claim 7, wherein the switch is configured as a MOS switch or a relay switch.
9. The low-ripple output voltage generator of claim 1, further comprising a filtering module connected between the rectifying module and the generator output, the filtering module configured to reduce ripple of the dc low-ripple voltage output by the rectifying module.
10. The low-ripple output voltage generator of claim 9, wherein the filter module is an LC filter circuit or a Π filter circuit.
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