Drive system

Abstract

The object of the present invention is to provide a drive system comprising an induction generator having a primary winding and a secondary conductor, the primary winding including a main winding and an auxiliary winding, the drive system being capable of variable voltage of the main winding and increasing maximum output of the auxiliary winding. To this end, the drive system comprises an induction generator having a primary winding and a secondary conductor, the primary winding including a main winding and an auxiliary winding, the drive system comprising: a starting battery for starting the induction generator; a driving converter for driving a driving motor; an auxiliary converter for driving an auxiliary motor; a rectifier whose input side is connected to the main winding and whose output side is connected to the driving converter; and a generator converter whose output side is connected to the auxiliary winding and whose input side is connected to the auxiliary converter and the starting battery.

Description

Technical Field

[0001] The present invention relates to a drive system using an induction generator, wherein the induction generator has a primary winding having a main winding and an auxiliary winding. Background Technology

[0002] A drive system using a generator is known, wherein the generator has a primary winding having a main winding and an auxiliary winding.

[0003] For example, the generator described in Patent Document 1 has a three-phase winding (equivalent to the main winding) and a separate excitation winding (equivalent to the auxiliary winding). The three-phase winding is connected to the battery and the driving converter via a rectifier, and the excitation winding is connected to the battery and the driving converter via the excitation converter.

[0004] The generator described in Patent Document 2 has a main output winding (equivalent to a main winding) and an auxiliary output winding (equivalent to an auxiliary winding). The main output winding is connected to the power system, and the auxiliary output winding is connected to the auxiliary power system.

[0005] Patent document 3 describes a generator having a stator winding (equivalent to a main winding) and an auxiliary winding. The stator winding is connected to a converter via a rectifier, and the auxiliary winding is connected to a starting motor and an external cooling fan. Furthermore, the auxiliary winding is located at the bottom of a slot in the stator core.

[0006] Existing technical documents

[0007] Patent documents

[0008] Patent Document 1: Japanese Patent Application Publication No. 8-79908

[0009] Patent Document 2: Japanese Patent Application Publication No. 2005-168288

[0010] Patent Document 3: Japanese Patent Application Publication No. 59-76156 Summary of the Invention

[0011] Patent document 1 has a three-phase winding (equivalent to the main winding) and a separate excitation winding (equivalent to the auxiliary winding). However, since the three-phase winding is connected to the battery through a diode bridge (rectifier), the three-phase winding needs to be set to a constant voltage and cannot be set to a variable voltage.

[0012] Patent document 2 has a main output winding (equivalent to a main winding) and an auxiliary output winding (equivalent to an auxiliary winding). However, since the main output winding is connected to the power system, it is necessary to set the main output winding to a constant voltage, and it is not possible to set the main output winding to a variable voltage.

[0013] As such, Patent Document 1 and Patent Document 2 present the problem that it is impossible to set the three-phase winding or the main output winding (main winding) to a variable voltage.

[0014] Even assuming that the three-phase winding or main output winding (main winding) can be set to a variable voltage, since the voltage of the excitation winding or auxiliary output winding (auxiliary winding) changes proportionally to the voltage of the three-phase winding or main output winding (main winding), a new problem arises: when the voltage of the excitation winding or auxiliary output winding (auxiliary winding) decreases, the maximum power output (maximum output of the auxiliary winding) generated from the excitation winding or auxiliary output winding (auxiliary winding) will decrease.

[0015] Patent Document 3 includes a stator winding (equivalent to the main winding) and an auxiliary winding. The stator winding is connected to the converter via a rectifier, thus eliminating the need to set the stator winding to a constant voltage and allowing it to be set to a variable voltage. However, the power generated from the stator winding is supplied to the ship at a constant voltage and frequency. Furthermore, there is no record of operating the stator winding under a variable voltage. If the stator winding is not operated under a variable voltage, the issue of a reduction in the maximum value of power generated from the auxiliary winding will not arise. Additionally, since it is a synchronous machine, there is a problem of requiring brushes for excitation.

[0016] The present invention was made in view of the above-mentioned problems, and its object is to provide a drive system having an induction generator having a primary winding and a secondary conductor, the primary winding including a main winding and an auxiliary winding, the drive system being able to make the voltage of the main winding variable and to increase the maximum output of the auxiliary winding.

[0017] To achieve the above objectives, the present invention provides a drive system comprising an induction generator having a primary winding and a secondary conductor, the primary winding including a main winding and an auxiliary winding, the drive system comprising: a starting battery for starting the induction generator; a driving converter for driving a driving motor; an auxiliary converter for driving an auxiliary motor; a rectifier with its input side connected to the main winding and its output side connected to the driving converter; and a power generation converter with its output side connected to the auxiliary winding and its input side connected to the auxiliary converter and the starting battery.

[0018] According to the present invention configured as described above, since the starting battery is independent of the main winding of the induction generator, the voltage on the main winding side of the induction generator can be varied, and the output power of the auxiliary winding can be increased by changing the frequency of the auxiliary winding using a generator converter.

[0019] Invention Effects

[0020] According to the present invention, in a drive system using an induction generator having a primary winding including a main winding and an auxiliary winding, the voltage of the main winding can be made variable, and the maximum output of the auxiliary winding can be increased. Attached Figure Description

[0021] Figure 1 This is a structural diagram of the drive system according to the first embodiment of the present invention.

[0022] Figure 2 This is an explanatory diagram showing the relationship between the required voltage of the driving converter and the required power of the driving converter and the auxiliary machine converter.

[0023] Figure 3 These are side views and cross-sectional views showing the structure of the dual-winding induction generator in the first embodiment of the present invention.

[0024] Figure 4 This is an explanatory diagram of the magnetic coupling between the primary winding and the secondary conductor of a two-winding induction generator.

[0025] Figure 5 This is an explanatory diagram showing the measurement results of the maximum power that the main winding and auxiliary winding can output when the maximum power required by the converter for driving and auxiliary equipment is set to 1.

[0026] Figure 6 This is a cross-sectional view showing the structure of the dual-winding induction generator in the second embodiment of the present invention.

[0027] Figure 7 This is a cross-sectional view showing the structure of the dual-winding induction generator in the third embodiment of the present invention.

[0028] Figure 8 This is a cross-sectional view showing the structure of the dual-winding induction generator in the fourth embodiment of the present invention. Detailed Implementation

[0029] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. It should be noted that in each drawing, equivalent elements are labeled with the same reference numerals, and redundant descriptions are omitted where appropriate.

[0030] Example 1

[0031] As a first embodiment of the drive system of the present invention, the drive system of an electrically driven dump truck will be described as an example.

[0032] Figure 1 This is a structural diagram of the drive system in this embodiment. Figure 1The drive system includes an induction generator (dual-winding induction generator) 2, a starting battery 10 for starting the dual-winding induction generator 2, a driving converter 4 for driving the driving motor 5, an auxiliary converter 8 for driving the auxiliary motor 9, a rectifier 3, and a generator converter 7. The dual-winding induction generator 2 is driven by the prime mover 1. The dual-winding induction generator 2 has a primary winding and a secondary conductor, the primary winding including a main winding and an auxiliary winding. Because the dual-winding induction generator 2 has a primary winding including a main winding and an auxiliary winding, the drive system is simplified and the cost is reduced compared to using two generators, a main generator and an auxiliary generator.

[0033] The input side of rectifier 3 is connected to the main winding of the dual-winding induction generator 2, and the output side is connected to the driving converter 4 and the regenerative discharge resistor 6. The regenerative discharge resistor 6 discharges the power generated by the regenerative operation of the driving motor 5. The output side of the generator converter 7 is connected to the auxiliary winding of the dual-winding induction generator 2, and the input side is connected to the auxiliary converter 8 and the starting battery 10. The starting battery 10 supplies power to the generator converter 7 when the dual-winding induction generator 2 starts.

[0034] The main winding of the dual-winding induction generator 2 is connected to the driving converter 4 via the rectifier 3, without passing through the battery that needs to be set to a constant voltage. Since it is not connected to the power system that needs to be set to a constant voltage, there is no need to set the main winding of the dual-winding induction generator 2 to a constant voltage.

[0035] The voltages of the main winding and the auxiliary winding of the dual-winding induction generator 2 are approximately proportional. Therefore, by using the generator converter 7 to change the voltage of the auxiliary winding of the dual-winding induction generator 2, the main winding of the dual-winding induction generator 2 can be made to have a variable voltage. In this way, by using the generator converter 7 to excite the auxiliary winding of the dual-winding induction generator 2, brushless operation can be achieved.

[0036] The power required by the auxiliary converter 8 is greater than that required by the driving converter 4. Therefore, for a converter that is more expensive than a rectifier, it is more cost-effective to connect it to the auxiliary converter 8, which requires less power, rather than connecting it to the driving converter 4.

[0037] After the dual-winding induction generator 2 is started, the starting battery 10 is disconnected from the auxiliary converter 8, so the voltage required by the auxiliary converter 8 can be set to a different value than that of the starting battery 10.

[0038] The auxiliary converter 8 requires a constant voltage, but the auxiliary winding of the dual-winding induction generator 2 has a variable voltage. The generator converter 7 can boost the voltage of the auxiliary winding of the dual-winding induction generator 2. Therefore, by designing the dual-winding induction generator 2 such that the voltage of the auxiliary winding of the dual-winding induction generator 2 is lower than the voltage required by the auxiliary converter 8, it can operate at the voltage required by the auxiliary converter 8.

[0039] Figure 2 This is an explanatory diagram showing the relationship between the required voltage of the travel converter 4 and the power required by both the travel converter 4 and the auxiliary converter 8. The horizontal axis is the quotient obtained by dividing the square of the voltage V required by the travel converter 4 by the frequency f of the dual-winding induction generator 2. The vertical axis represents the power requirements Pmain and Paux of the travel converter 4 and the auxiliary converter 8, respectively. ΔPmain is the ratio of the power required by the travel converter 4, Pmain, to the power that the main winding 2131 can output. ΔPaux is the ratio of the power required by the auxiliary converter 8, Paux, to the power that the auxiliary winding 2132 can output. Figure 2 In the diagram, the slopes of dashed lines represent ΔPmain and ΔPaux, and the states where ΔPmain and ΔPaux (the slopes of the dashed lines) are at their maximum are plotted. Figure 2 In the above, the larger ΔPmain is, the smaller the margin of output power of the main winding 2131 is relative to the required power Pmain of the driving converter 4 (the more stringent the requirements on the main winding 2131); the larger the slope of ΔPaux is, the smaller the margin of output power of the auxiliary winding 2132 is relative to the required power Paux of the auxiliary converter 8 (the more stringent the requirements on the auxiliary winding 2132).

[0040] Typically, the magnetic flux Φ of the two-winding induction generator 2 is directly proportional to the voltage V and inversely proportional to the angular frequency ω (ω = 2πf, f: the frequency of the two-winding induction generator 2).

[0041]

Formula 1

[0042] Φ~V / ω···(1)

[0043] The reactance X is proportional to the angular frequency ω and the inductance L.

[0044]

Formula 2

[0045] X~ωL···(2)

[0046] Current I is directly proportional to voltage V and inversely proportional to reactance X.

[0047]

Formula 3

[0048] I~V / X···(3)

[0049] The torque T is proportional to the magnetic flux Φ and the current I.

[0050]

Formula 4

[0051] T~ΦI···(4)

[0052] The output P is proportional to the angular frequency ω and the torque T.

[0053]

Formula 5

[0054] P~ωT···(5)

[0055] If we substitute equation (4) into equation (5) above, then substitute equation (1) and equation (3), and further substitute equation (2), then the output P is expressed as follows.

[0056]

Formula 6

[0057] P~ωΦI~ω(V / ω)(V / X)

[0058] ~ω(V / ω)(V / X)

[0059] ~ω(V / ω)(V / (ωL))

[0060] ~V 2 / (ωL)···(5)

[0061] Therefore, the maximum power output of the dual-winding induction generator 2 is proportional to the quotient obtained by dividing the square of the voltage V by the frequency f. That is, the maximum power output of the dual-winding induction generator 2 is proportional to... Figure 2 The value is proportional to the horizontal axis, meaning that the larger ΔPmain or ΔPaux is, the more severe the power requirement for the output becomes.

[0062] The maximum power requirement Pmain of the driving converter 4 is greater than the maximum power requirement Paux of the auxiliary converter 8. Therefore, at first glance, it is often assumed that the main winding side of the dual-winding induction generator 2, which is connected to the driving converter 4, experiences a power increase. However, in the drive system of an electrically driven dump truck, such as... Figure 2 As shown, ΔPaux is larger than ΔPmain, indicating that the auxiliary winding side of the dual-winding induction generator 2 connected to the auxiliary converter 8 is more severe.

[0063] Electric-driven dump trucks, for example, used in mines, stop moving during loading or unloading operations. At this time, the drive system of the electric-driven dump truck suppresses the speed of the prime mover 1 to a low idling state in order to reduce energy consumption and improve fuel efficiency. Since the prime mover 1 and the dual-winding induction generator 2 have the same speed, if the speed of the prime mover 1 is suppressed to a low speed, the frequency f of the dual-winding induction generator 2 becomes lower, and the angular frequency ω of equation 3 becomes lower. At this time, it is necessary to reduce the voltage V so that the magnetic flux Φ of equation 3 does not become too large, and the driving converter 4 requires a low voltage. Moreover, immediately after idling ends, there is a possibility that the speed of the prime mover 1 (the frequency f of the dual-winding induction generator) becomes maximum while maintaining the low voltage required by the driving converter 4. Figure 2 The horizontal axis becomes minimum. At the point where the voltage V and frequency f become minimum, if the power required by the auxiliary converter Paux becomes maximum, then ΔPaux becomes maximum. Figure 2 The auxiliary winding side is marked as the most critical point.

[0064] When the power required by the driving converter 4, Pmain, is at its maximum and the voltage required by the driving converter 4, V, is at its minimum, ΔPmain becomes maximum. Figure 2 The main winding side is marked as the most severe point.

[0065] As described above, the maximum power output of the dual-winding induction generator 2 is... Figure 2 The value is proportional to the horizontal axis, meaning that the larger ΔPmain or ΔPaux is, the more severe the power requirement for the output. For example... Figure 2 As shown, since the maximum value of ΔPaux is greater than the maximum value of ΔPmain, the power required by the output converter is mainly on the auxiliary winding side of the dual-winding induction generator 2.

[0066] The fact that the maximum value of ΔPaux is greater than the maximum value of ΔPmain is a phenomenon unique to the case where a dual-winding induction generator 2 is applied to the drive system of an electrically driven dump truck.

[0067] Figure 3These are side and cross-sectional views showing the structure of the dual-winding induction generator 2 in this embodiment. The dual-winding induction generator 2 includes a stator 21 and a rotor 22. The stator 21 has a primary winding 213 disposed in a stator slot 212 formed in the stator core 211. The primary winding 213 has a main winding 2131 and an auxiliary winding 2132. The primary winding 213 is held in the stator slot 212 by a wedge 214. The rotor 22 has a rotor rod 2231 disposed in a rotor slot 222 formed in the rotor core 221. The rotor rod 2231 is short-circuited at its end by a short-circuit ring 2232. The secondary conductor 223 has the rotor rod 2231 and the short-circuit ring 2232. The gap 23 is the clearance between the stator 21 and the rotor 22.

[0068] If the voltage of the auxiliary winding 2132 is changed by using the generator converter 7, the change in magnetic flux passing through the stator core 211 and the rotor core 221, and the change in the magnetic flux linkage of the main winding 2131 can be controlled so that the voltage of the main winding 2131 changes to the voltage required by the driving converter 4.

[0069] If the frequency of the auxiliary winding 2132 is changed by using the generator converter 7, the slip rate changes, and the current of the secondary conductor 223 changes. This can be controlled so that the power output from the main winding 2131 and the auxiliary winding 2132 changes to the power required by the driving converter 4 or the auxiliary machine converter 8.

[0070] Figure 4 This is an explanatory diagram regarding the magnetic coupling between the primary winding 213 and the secondary conductor 223. The primary winding 213 has a main winding 2131 and an auxiliary winding 2132, but... Figure 4 Only the magnetic coupling between the auxiliary winding 2132 and the secondary conductor 223 will be described. The magnetic coupling between the main winding 2131 and the secondary conductor 223 can... Figure 4 The auxiliary winding 2132 is replaced by the main winding 2131. Figure 4 (a) represents the state where the maximum output decreases. Figure 4 (b) represents the state where the maximum output increases; in this embodiment, it is... Figure 4 The state of (b). In Figure 4 In (a), the auxiliary winding 2132 is positioned away from the rotor rod 2231. Figure 4 In (b), the auxiliary winding 2132 is positioned close to the rotor rod 2231.

[0071] Figure 4 (b) and Figure 4Compared to (a), the gap between the auxiliary winding 2132 and the rotor rod 2231 is smaller (closer distance), therefore, the amount of magnetic flux (leakage flux) passing through this gap is smaller, and correspondingly, the amount of magnetic flux linked with the auxiliary winding (main flux) is larger. If the main flux is increased, the magnetic coupling between the auxiliary winding 2132 and the rotor rod 2231 becomes stronger, and the maximum output increases.

[0072] Therefore, in such Figure 2 In cases where the power requirements for the auxiliary winding 2132 are more stringent (the maximum value of ΔPaux is greater than the maximum value of ΔPmain), the auxiliary winding 2132 is positioned closer to the secondary conductor 223 than the main winding 2131.

[0073] Figure 5 This is an explanatory graph showing the maximum power output of the main and auxiliary windings when the maximum power required by the converter for driving and auxiliary equipment is set to 1. If the value on the vertical axis of the graph is greater than 1, it means that the generator cannot output the power required by the converter. Figure 5 In the figure, the values ​​of the main winding 2131 are equivalent to the reciprocals of ΔPmain, and the values ​​of the auxiliary winding 2132 are equivalent to the reciprocals of ΔPaux. The results are measured under the condition that the power requirements of the auxiliary winding 2132 are more severe (the maximum value of ΔPaux is greater than the maximum value of ΔPmain).

[0074] This is the case where the maximum value of ΔPaux is greater than the maximum value of ΔPmain, according to... Figure 5 The measurement results also confirmed that the power requirement for the auxiliary winding 2132 is more stringent. That is, when the maximum power required by the auxiliary converter 8 is set to 1, the maximum power (maximum output) that the auxiliary winding 2132 can output is around 1. In contrast, when the maximum power required by the driving converter 4 is set to 1, the maximum output of the main winding 2131 is about 2 to 2.5, which is confirmed to be larger than the auxiliary winding's power of around 1.

[0075] By positioning the auxiliary winding 2132 closer to the secondary conductor 223 than the main winding 2131 (positioning the auxiliary winding on the secondary conductor side), the maximum output of the auxiliary winding 2132 increases compared to positioning it further away from the secondary conductor 223 than the main winding 2131 (positioning the auxiliary winding on the opposite side of the secondary conductor). This is because positioning the auxiliary winding 2132 closer to the secondary conductor 223 strengthens the magnetic coupling between them.

[0076] Through such Figure 4By configuring the auxiliary winding 2132 closer to the secondary conductor 223 than the main winding 2131 (configuring the auxiliary winding on the secondary conductor side), it was confirmed that the maximum output of the auxiliary winding 2132 exceeded the maximum power required by the auxiliary converter 8.

[0077] (Effect)

[0078] In this embodiment, the drive system includes an induction generator 2 having a primary winding 213 and a secondary conductor 223. The primary winding 213 includes a main winding 2131 and an auxiliary winding 2132. The drive system includes: a starting battery 10 for starting the induction generator 2; a driving converter 4 for driving a driving motor 5; an auxiliary converter 8 for driving an auxiliary motor 9; a rectifier 3 whose input side is connected to the main winding 2131 and whose output side is connected to the driving converter 4; and a power generation converter 7 whose output side is connected to the auxiliary winding 2132 and whose input side is connected to the auxiliary converter 8 and the starting battery 10.

[0079] According to the embodiment configured as described above, the starting battery 10 is separated from the main winding 2131 of the induction generator 2, so the voltage of the main winding 2131 of the induction generator 2 can be varied, and the output power of the auxiliary winding 2132 can be increased by changing the frequency of the auxiliary winding 2132 using the generator converter 7.

[0080] Furthermore, in this embodiment, the maximum value of the ratio ΔPaux of the required power Paux of the auxiliary converter 8 to the output power ΔPaux of the auxiliary winding 2132 is greater than the maximum value of the ratio ΔPmain of the required power Pmain of the driving converter 4 to the output power ΔPmain of the main winding 2131. Therefore, the auxiliary winding 2132 is positioned closer to the secondary conductor 223 than the main winding 2131. Consequently, with the main winding 2131 positioned opposite the secondary conductor and the auxiliary winding 2132 closer to the secondary conductor 223, the magnetic coupling between the auxiliary winding 2132 and the secondary conductor 223 becomes stronger, and the power factor of the power output from the auxiliary winding 2132 is improved. Since the power factor is improved, the current required to output the same effective power is reduced, thus suppressing the temperature rise of the auxiliary winding 2132.

[0081] Example 2

[0082] The second embodiment of the present invention will be described focusing on the differences from the first embodiment. Figure 6 This is a cross-sectional view showing the structure of the dual-winding induction generator 2 in this embodiment.

[0083] When the power requirements on the main winding 2131 are more stringent (the maximum value of ΔPmain is greater than the maximum value of ΔPaux), such as Figure 6As shown, the auxiliary winding 2132 is positioned further away from the secondary conductor 223 than the main winding 2131. When the power demand on the main winding 2131 is more severe (the maximum value of ΔPmain is greater than the maximum value of ΔPaux), the power demand on the main winding 2131 is more severe than that on the auxiliary winding 2132, thus increasing the maximum output of the main winding 2131.

[0084] By configuring the auxiliary winding 2132 at a position farther away from the secondary conductor 223 than the main winding 2131 (configuring the auxiliary winding on the opposite side of the secondary conductor), such as Figure 5 As shown, the maximum output of the main winding 2131 is increased.

[0085] (Effect)

[0086] In this embodiment, the maximum value of the ratio ΔPmain of the required power Pmain of the driving converter 4 to the output power of the main winding 2131 is greater than the maximum value of the ratio ΔPaux of the required power Paux of the auxiliary converter 8 to the output power of the auxiliary winding 2132. The main winding 2131 is positioned closer to the secondary conductor 223 than the auxiliary winding 2132.

[0087] In this embodiment, with the auxiliary winding 2132 positioned on the opposite side of the secondary conductor and the main winding 2131 close to the secondary conductor 223, the magnetic coupling between the main winding 2131 and the secondary conductor 223 is strengthened, resulting in an improved power factor for the power output from the main winding 2131. This improved power factor reduces the current required to output the same effective power, thus suppressing temperature rise in the main winding 2131 and reducing the size of the dual-winding induction generator 2.

[0088] Example 3

[0089] The second embodiment of the present invention will be described focusing on the differences from the first embodiment. Figure 7 This is a cross-sectional view showing the structure of the dual-winding induction generator 2 in this embodiment.

[0090] In cases where it is unclear which of the power requirements for the main winding 2131 and the auxiliary winding 2132 is more severe (the maximum values ​​of ΔPmain and ΔPaux are unclear), such as Figure 7 As shown, the auxiliary winding 2132 and the main winding 2131 are positioned at equal distances from the secondary conductor 223. Furthermore, Figure 5 "Arranging the auxiliary winding alongside the main winding" refers to Figure 7 Configuration.

[0091] By arranging the auxiliary winding 2132 and the main winding 2131 at equal distances from the secondary conductor 223, it is possible to obtain a result similar to... Figure 5 The same tendency applies. That is, it is possible to obtain characteristics that are intermediate between when the auxiliary winding is configured on the opposite side of the secondary conductor and when it is configured on the secondary conductor side, and to achieve a balance between the maximum output of the auxiliary winding 2132 and the main winding 2131.

[0092] (Effect)

[0093] In this embodiment, the main winding 2131 and the auxiliary winding 2132 are configured to be at equal distances from the secondary conductor 223.

[0094] According to the embodiment configured as described above, a balance between the maximum output of the auxiliary winding 2132 and the main winding 2131 can be achieved, rather than prioritizing the characteristics of either the auxiliary winding 2132 or the main winding 2131. Therefore, even if the voltage or power required by the driving converter 4 or the auxiliary converter 8 changes, the specifications of the induction generator 2 can be changed without altering them.

[0095] Example 4

[0096] The fourth embodiment of the present invention will be described focusing on the differences from the second embodiment. Figure 8 This is a cross-sectional view showing the structure of the dual-winding induction generator 2 in this embodiment.

[0097] like Figure 8 As shown, when the auxiliary winding 2132 is positioned further away from the secondary conductor 223 than the main winding 2131, a stator core protrusion 2111 is provided between the main winding 2131 and the auxiliary winding 2132, and an insulator 2141 is provided between the stator core protrusion 2111 and the auxiliary winding 2132 to prevent the auxiliary winding 2132 from falling off. Therefore, during the period from assembling the auxiliary winding 2132 into the stator slot 212 to assembling the main winding 2131, the auxiliary winding 2132 can be prevented from falling off the stator slot 212, making the assembly of the main winding 2131 easier. The voltage of the auxiliary winding 2132 is set to a low voltage in the hundreds of volts, allowing for the use of enamel insulation on the auxiliary winding 2132. The auxiliary winding 2132 uses multiple enamel-insulated wires. The enamel-insulated wires are round wires. Its size (diameter) is set to be smaller than the width of the stator slot 212 (shown as a double arrow in the figure) of the part where the stator core protrusion 2111 is provided.

[0098] By setting a stator core protrusion 2111 between the main winding 2131 and the auxiliary winding 2132, the amount of magnetic flux (leakage flux) passing through the main winding 2131 and the auxiliary winding 2132 increases, the magnetic coupling between the main winding 2131 and the auxiliary winding 2132 weakens, and the magnetic interference generated between the two windings can be suppressed.

[0099] The voltage of the main winding 2131 is set to a high voltage in the kV range, enabling the use of a large-capacity motor in the MW range for the driving motor 5. The main winding 2131 uses multiple square wires insulated with glass or mica. In this case, the main winding 2131 is assembled onto the stator core 211 after the multiple square wires are bundled together, so it is not possible to provide a protrusion on the stator core 211 on the gap side of the main winding 2131. Therefore, it is necessary to provide a recess on the stator core 211 and fix a wedge 214 to prevent the main winding 2131 from falling off.

[0100] (Effect)

[0101] In this embodiment, the device includes: a stator core 211 having a stator slot 212 for a primary winding 213; and a rotor core 221 having a rotor slot 222 for a secondary conductor 223. The stator slot 212 has a stator core protrusion 2111 formed in a protruding manner between the auxiliary winding 2132 and the main winding 2131, and an insulator 2141 is provided between the stator core protrusion 2111 and the auxiliary winding 2132.

[0102] According to this embodiment configured as described above, during the period from assembling the auxiliary winding 2132 to assembling the main winding 2131 after assembling the stator core 211, the auxiliary winding 2132 can be prevented from falling off the stator slot 212, thus making the assembly operation of the main winding 2131 easier. In addition, by providing the stator core protrusion 2111 between the main winding 2131 and the auxiliary winding 2132, the amount of magnetic flux (leakage flux) passing through the main winding 2131 and the auxiliary winding 2132 increases, the magnetic coupling between the main winding 2131 and the auxiliary winding 2132 weakens, and magnetic interference generated between the two windings can be suppressed.

[0103] The embodiments of the present invention have been described in detail above, but the present invention is not limited to the above embodiments and includes various modifications. For example, the above embodiments have been described in detail for ease of understanding of the present invention, but are not limited to having all the structures described. In addition, it is also possible to add structures of other embodiments to the structure of one embodiment, or to delete a part of the structure of one embodiment, or to replace it with a part of another embodiment.

[0104] Explanation of reference numerals in the attached figures

[0105] 1: Prime mover; 2: Dual-winding induction generator; 3: Rectifier; 4: Travel converter; 5: Travel motor; 6: Regenerative discharge resistor; 7: Generator converter; 8: Auxiliary converter; 9: Auxiliary motor; 10: Starting battery; 21: Stator; 211: Stator core; 212: Stator slot; 213: Primary winding; 2131: Main winding; 2132: Auxiliary winding; 214: Wedge; 22: Rotor; 221: Rotor core; 222: Rotor slot; 223: Secondary conductor; 2231: Rotor rod; 2232: Short-circuit ring; 224: Shaft; 23: Clearance.

Claims

1. A drive system comprising an induction generator having a primary winding and a secondary conductor, the primary winding including a main winding and an auxiliary winding. The drive system is characterized by having: A starting battery for starting the induction generator; A driving converter that drives a driving motor; A converter for driving auxiliary motors; A rectifier whose input side is connected to the main winding and whose output side is connected to the driving converter; and A power generation converter whose output side is connected to the auxiliary winding and whose input side is connected to the auxiliary converter and the starting battery. The auxiliary converter is connected to the auxiliary winding. The starting battery is independent of the main winding, supplies power to the generator converter when the induction generator starts, and is disconnected from the auxiliary converter after the induction generator has started.

2. The drive system according to claim 1, characterized in that, The maximum value of the ratio of the required power of the auxiliary converter to the output power of the auxiliary winding is greater than the maximum value of the ratio of the required power of the driving converter to the output power of the main winding. The auxiliary winding is positioned closer to the secondary conductor than the main winding.

3. The drive system according to claim 1, characterized in that, The maximum value of the ratio of the required power of the driving converter to the output power of the main winding is greater than the maximum value of the ratio of the required power of the auxiliary converter to the output power of the auxiliary winding. The main winding is positioned closer to the secondary conductor than the auxiliary winding.

4. The drive system according to claim 3, characterized in that, have: Stator core, having stator slots for accommodating the primary winding; and The rotor core has rotor slots on which the secondary conductors are disposed. The stator slot has a stator core protrusion formed in a protruding manner between the auxiliary winding and the main winding. An insulator is provided between the stator core protrusion and the main winding.

5. The drive system according to claim 1, characterized in that, The main winding and the auxiliary winding are configured to be equidistant from the secondary conductor.

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