WO2015199104A1 - モータ駆動装置 - Google Patents
モータ駆動装置 Download PDFInfo
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- WO2015199104A1 WO2015199104A1 PCT/JP2015/068117 JP2015068117W WO2015199104A1 WO 2015199104 A1 WO2015199104 A1 WO 2015199104A1 JP 2015068117 W JP2015068117 W JP 2015068117W WO 2015199104 A1 WO2015199104 A1 WO 2015199104A1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/10—Arrangements for controlling torque ripple, e.g. providing reduced torque ripple
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
- H02P25/16—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring
- H02P25/22—Multiple windings; Windings for more than three phases
Definitions
- the present invention relates to a motor drive device.
- the present invention has been made to solve the above-described problems in the prior art. Its main purpose is to suppress the pulsation of the drive torque generated by the motor when one of the phases is lost during the motor drive in the motor drive device that controls the drive of the independent winding type multi-phase motor. While continuing to drive the motor.
- the motor driving device controls the driving of a multi-phase motor in which the electric windings of each phase are provided independently of each other, and the DC power supplied through the DC bus is supplied to the multi-phase motor.
- An inverter circuit that converts the alternating current power into an electric winding of each phase, and a controller for controlling the inverter circuit, and the controller includes any phase in the alternating current power.
- the phase difference between the currents flowing through the normal-phase electric element windings is adjusted so that the AC powers of the other normal phases excluding the phase that has lost phase cancel each other.
- a motor driving device that controls driving of an independent winding type multi-phase motor, when any phase is lost during driving of the motor, pulsation of driving torque generated by the motor is suppressed. It is possible to continue driving the motor.
- FIG. 1 It is a figure which shows the structure of the motor drive device which concerns on the 1st Embodiment of this invention. It is a figure which shows the example of arrangement
- FIG. 1 It is a figure which shows the example of a waveform of the induced voltage, electric current, and electric power of each phase in the motor at the normal time. It is a figure which shows the waveform example of the induced voltage of each phase in a motor, the electric current, and electric power in the case of not performing phase adjustment of an electric current when a W phase is missing. It is a figure which shows the waveform example of the induced voltage of each phase, the electric current, and electric power in a motor at the time of performing the phase adjustment of an electric current when a W phase has lost phase. It is a figure which shows the waveform of the U-phase electric current after phase adjustment and the V-phase electric current when a W phase is missing.
- FIG. 11 is a diagram showing magnetomotive force vectors in the motor corresponding to the electrical angles A to G shown in FIG. 10.
- a motor drive device it is a figure which shows a mode that the bridge circuit of W phase among inverter circuits failed. It is a figure which shows the DC voltage and the induced voltage of a W phase when the rotation speed of a motor is comparatively low. It is a figure which shows the DC voltage and W phase induced voltage when the rotation speed of a motor is more than a fixed value. It is a figure which shows the electric current path in the bridge circuit of the W phase at the time of an off failure.
- a motor drive device it is a figure which shows an electric current path
- FIG. 1 is a diagram showing a configuration of a motor drive device 200 according to the first embodiment of the present invention.
- the motor driving device 200 is connected to a motor 100 used for a hybrid vehicle (HEV), an electric vehicle (EV), and the like, and controls driving of the motor 100.
- the motor driving device 200 includes a DC power supply 201, a smoothing capacitor 202, a controller 203, and an inverter circuit 210.
- the motor 100 is an independent winding type six-wire three-phase AC motor having three-phase electric element windings 102a, 102b, and 102c corresponding to the U phase, the V phase, and the W phase, respectively. These armature windings 102a to 102c are provided independently of each other.
- the motor driving device 200 can drive the motor 100 by independently controlling the currents flowing through the armature windings 102a to 102c.
- a magnetic pole position detector 110 that detects the magnetic pole position ⁇ of the motor 100 is attached to the output shaft 105 of the motor 100. The detection result of the magnetic pole position ⁇ by the magnetic pole position detector 110 is output to the controller 203.
- DC power supply 201 supplies DC power to inverter circuit 210 via DC buses 201a and 201b.
- a secondary battery such as a lithium ion battery can be used.
- the smoothing capacitor 202 is for suppressing the fluctuation
- the controller 203 outputs drive signals Gu, Gv, and Gw to the bridge circuits 210a, 210b, and 210c of each phase that the inverter circuit 210 has.
- the controller 203 can control the inverter circuit 210 by operating the bridge circuits 210a, 210b, and 210c according to the drive signals Gu, Gv, and Gw, respectively.
- the inverter circuit 210 has full-bridge bridge circuits 210a, 210b and 210c corresponding to the U phase, the V phase and the W phase, respectively.
- Each bridge circuit 210 a, 210 b, 210 c has four IGBTs 221 that function as switching elements for the upper and lower arms, and four diodes 222 provided in parallel with each IGBT 221.
- each IGBT 221 performs a switching operation according to the drive signals Gu, Gv, and Gw from the controller 203.
- the DC power supplied from the DC power supply 201 is converted into three-phase AC power, and the electric windings of the respective phases of the motor 100 via the AC output lines 120 of the respective phases from the bridge circuits 210a, 210b, 210c. 102a, 102b, and 102c, respectively.
- Each phase AC output line 120 is provided with a current sensor 130 for detecting each current flowing in the electric windings 102a, 102b, 102c of the motor 100.
- the current values i u , i v , i w of each phase detected by the current sensor 130 are output to the controller 203.
- the controller 203 performs a predetermined current control calculation based on the current values i u , i v , i w of each phase input from the current sensor 130 and the magnetic pole position ⁇ input from the magnetic pole position detector 110. And output drive signals Gu, Gv, Gw for each phase based on the calculation result.
- FIG. 2 is a diagram illustrating an arrangement example of the armature windings 102 a, 102 b, 102 c in the motor 100.
- the armature windings 102a, 102b, and 102c are mechanically shifted by 120 ° so that the phase difference of the waveform of the induced voltage of each phase becomes 120 ° in electrical angle. It is arranged on the stator.
- the motor windings 102a, 102b, and 102c are provided independently of each other in the motor 100, and are different from the Y-connection and ⁇ -connection structures in the conventional general three-phase balanced motor. .
- FIG. 3 is a diagram illustrating an example of the structure of the motor 100.
- the motor 100 includes a stator core 101 to which a plurality of armature windings 102 are attached, and a rotor core 103 that is fixed to the output shaft 105 and has a plurality of permanent magnets 104 attached to the surface. It is a surface magnet type motor constituted.
- Each of the armature windings 102 corresponds to one of the armature windings 102a, 102b, 102c in FIG.
- FIG. 4 is a diagram showing how the flux linkage, the induced voltage, and the inductance change in the motor 100 having the structure shown in FIG.
- the interlinkage magnetic flux of the U phase is ⁇ u
- the induced voltage is e u
- the self-inductance is L u
- the mutual inductance between the U phase and the V phase is M uv
- the self-inductance L u and the mutual inductance M uv are constant regardless of the electrical angle in the structure of FIG. The same applies to the V phase and the W phase.
- FIG. 5 is a diagram illustrating another example of the structure of the motor 100.
- the motor 100 is fixed to the stator core 101 to which the plurality of armature windings 102 are attached and the output shaft 105 as in FIG. 3, and the plurality of permanent magnets 104 are embedded therein.
- This is an embedded magnet type motor constituted by the rotor core 103.
- FIG. 6 is a diagram showing how the flux linkage, induced voltage, and inductance change in the motor 100 having the structure shown in FIG.
- the interlinkage magnetic flux of the U phase is ⁇ u
- the induced voltage is e u
- the self-inductance is L u
- the mutual inductance between the U phase and the V phase is M uv .
- the self-inductance L u and the mutual inductance M uv change periodically with the electrical angle of 360 ° as two cycles (that is, the electrical angle of 180 ° as one cycle) in the structure of FIG. The same applies to the V phase and the W phase.
- the voltage equation of the motor 100 using the permanent magnet as shown in FIG. 3 or FIG. 5 is expressed by the following equation (1).
- v u , v v , v w and i u , i v , i w represent the voltage and current of the U phase, V phase, and W phase, respectively, and R is for one phase.
- P represents a differential operator.
- induced voltages e u , e v , e w of each phase, self-inductances L u , L v , L w of each phase, and mutual inductances M uv , M vw , M wu between the phases are Are represented by the following formulas (2), (3), and (4), respectively.
- ⁇ e represents the electrical angular rotation speed of the motor 100
- ⁇ m represents the winding flux linkage of the permanent magnet 104.
- l a denotes the leakage inductance of one phase of the formula (3)
- L a, L as the mean value and amplitude components of the effective inductance of one phase Represents each.
- a shaft torque T output from the motor 100 to the output shaft 105 is expressed by the following equation (5).
- P OUT represents mechanical energy (shaft output) output from the motor 100 to the output shaft 105
- ⁇ m represents the rotational angular velocity (shaft rotational speed) of the output shaft 105. That is, the shaft torque T is a value obtained by dividing the shaft output P OUT by the shaft rotation speed ⁇ m . Therefore, if the shaft rotational speed ⁇ m and the motor shaft output P OUT are constant values, the shaft torque T is also constant.
- the shaft output P OUT represented by Expression (6) is equal to a value obtained by subtracting each loss such as copper loss and iron loss from the input power PIN of the motor 100.
- the input power PIN of the motor 100 is obtained by adding the products of the instantaneous voltages v u , v v , v w of each phase and the instantaneous currents i u , i v , i w as shown in the following formula (7). It is obtained as a value.
- FIG. 7 is a diagram illustrating waveform examples of induced voltage, current, and power of each phase in the motor 100 at the normal time.
- the phase differences between the induced voltages e u , e v , and e w of the respective phases generated in the electric coil windings 102a, 102b, and 102c are all 120 °.
- the motor driving device 200 is configured so that the currents i u , i v , i w of the respective phases flowing through the electric windings 102a, 102b, 102c have a phase difference of 120 ° from each other, as shown in FIG.
- the operation timing of the IGBT 221 in each bridge circuit 210a, 210b, 210c is determined.
- the powers P u , P v , and P w of each phase obtained by the product of the induced voltage and current pulsate at a frequency twice that of the induced voltage and current as shown in FIG. Is 60 °.
- the input power PIN that is the sum of the three-phase powers P u , P v , and P w is constant as shown in FIG. Therefore, it can be seen that if the induced voltage and the current are sinusoidal waves, no torque pulsation is generated in principle.
- the induced voltage waveform and current waveform are assumed to be ideal sine waves. However, in actuality, the induced voltage waveform and current waveform include some harmonics, which is ideal. It will not be a sine wave. However, even in this case, the motor drive device 200 can operate the motor 100 with almost no problem by controlling the motor 100 by treating the induced voltage waveform or current waveform as a sine wave.
- the motor driving device 200 can drive all the phases of the motor 100 to rotate the motor 100 by controlling the torque of the motor 100.
- an abnormality occurs in the operation of the IGBT 221 in any of the bridge circuits 210a, 210b, 210c, or an abnormality such as a disconnection occurs in the AC output line 120 or the wiring in the motor 100 in any phase. If any phase is lost and energization is impossible, the torque of the motor 100 cannot be appropriately controlled by the same control method as in the normal state.
- FIG. 8 is a diagram illustrating an example of waveforms of induced voltage, current, and power in each phase in the motor 100 when the phase of the current is not adjusted when the W phase is lost.
- the phase difference of the currents i u and the V-phase current i v of U-phase remains normal as well as 120 °.
- the pulsation occurs at a frequency twice the induced voltage.
- the controller 203 controls each of the other normal phases excluding the lost phase.
- the phase difference between the currents flowing through the normal-phase electric windings is adjusted so that the AC powers cancel each other. Thereby, the pulsation of the output torque in the motor 100 is reduced, and the rotation of the motor 100 can be continued.
- FIG. 9 is a diagram illustrating an example of waveforms of induced voltage, current, and power in each phase in the motor 100 when the phase of the current is adjusted when the W phase is lost. If the W-phase is open phase, the motor drive device 200 as shown in FIG. 9, by shifting the phase of the current i v of the V-phase in a direction to 60 ° reduced from normal (left direction in the figure), and this Adjustment is performed so that the phase difference from the U phase current i u is 60 °.
- the current control operation by the control unit 203 performs, to adjust the phase of the V-phase current i v, to be output, in accordance with the the adjusted phase, the bridge circuit 210b of the V-phase from the controller 203
- the drive signal Gv is output.
- the valley portions of the U-phase power P peak portions u and the V-phase power P v, and U-phase power P u valleys and V-phase peak portions of the power P v of overlap respectively So that they cancel each other.
- the input power PIN that is the sum of the three-phase powers P u , P v , and P w can be made constant as shown in FIG. Therefore, the rotation of the motor 100 can be continued while suppressing torque pulsation.
- the motor driving device can provide each AC power in the normal phase when any phase is lost.
- Dp 360/2 (nm) (8)
- n and m are positive integers
- the phase difference Di (°) of each current flowing through the normal-phase electric element winding may be adjusted so as to satisfy the following equation (9).
- Di 360 / (nm) -360 / n (9)
- the motor drive device has an inverter circuit having n bridge circuits according to the number n of phases of the motor to be controlled, and each bridge circuit of the inverter circuit. And a controller for outputting a drive signal.
- a motor driven by this motor driving device needs to have n independent windings that can be controlled independently of each other, and the current flowing through each independent winding is controlled by the motor driving device.
- an abnormal operation occurs in the IGBT 221 or the diode 222 in the W-phase bridge circuit 210c, or the wiring in the motor 100 or the AC output line 120 is disconnected, thereby causing a W-phase armature.
- the motor drive device 200 can perform current control using the remaining normal two-phase electric element windings 102a and 102b.
- the motor 100 is driven by outputting the current of each phase with a phase difference of 120 degrees, as in the state in which the normal three phases are balanced even when the phase is lost, as described in FIG.
- a large pulsation occurs in the input power PIN that is a sum of the U-phase instantaneous power Pu and the V-phase instantaneous power Pv .
- a large torque pulsation occurs in the motor 100.
- the motor driving device 200 can control the current flowing through the electric windings 102a, 102b, and 102c of each phase of the motor 100 independently of each other.
- the phases of P u and P v are adjusted so that these peaks and valleys cancel each other.
- the motor driving apparatus 200 obtains the phase of the induced voltage of each phase based on the magnetic pole position information output from the magnetic pole position detector 110 attached to the output shaft 105 of the motor 100 in the controller 203, and A current control calculation for individually controlling the current phase of each phase is performed on the voltage.
- the phase difference between the instantaneous powers Pu and Pv is adjusted, and the torque pulsation of the motor 100 is reduced.
- the current control calculation includes the information on the current value output from the current sensor 130 of each phase attached between the motor driving device 200 and the motor 100, and the magnetic pole position detector attached to the output shaft 105 of the motor 100. 110 is performed using the magnetic pole position information output from 110.
- the controller 203 outputs drive signals Gu, Gv, and Gw to the IGBTs 221 included in the bridge circuits 210a, 210b, and 210c of the inverter circuit 210 according to the result of the current control calculation.
- the bridge circuit 210a, 210b, 210c of each phase performs a switching operation according to the drive signals Gu, Gv, Gw, so that the current phase with respect to the induced voltage of each phase can be individually adjusted.
- FIG. 10 is a diagram showing a waveform of a U-phase current i u and the V-phase current i v, after the phase adjustment when the W-phase is open-phase.
- FIG. 11 is a diagram showing magnetomotive force vectors in the motor 100 corresponding to the electrical angles A to G shown in FIG.
- the resultant magnetomotive force F uv generated in the motor 100 at this time is a vector sum of the U-phase magnetomotive force F u and the V-phase magnetomotive force F v as shown in FIG. 11B.
- the magnetomotive force in the motor 100 changes from A to B of FIG. 11. Comparing A and B in FIG. 11, the size of the U Aioko force F u and V Aioko force F v is changing respectively, for these synthetic magnetomotive force F uv, counterclockwise the same size It turns out that it rotates 30 degrees around.
- FIG. 11 illustration of the magnetomotive force vector generated for each electrical angle in the range of 210 ° to 360 ° shown in H to M of FIG. 10 is omitted.
- the value of the U-phase current i u and the V-phase current i v, in these electrical angle is the same as that obtained by inverting the sign of the value of each electrical angle shown respectively in B ⁇ G in FIG. 10. Therefore, similarly to the above, it can be seen that the combined magnetomotive force F uv of the U phase and the V phase at these electrical angles also rotates counterclockwise with the same magnitude.
- FIG. 11 a two-pole motor having an electrical angle and a mechanical angle that coincide with each other has been described as an example. Similarly, a multi-pole motor having a different electrical angle and a mechanical angle also has an armature as the current value changes. A rotating magnetic field can be generated in the winding.
- the motor drive device 200 is missing any phase due to an abnormal operation in one of the bridge circuits 210a, 210b, 210c of the inverter circuit 210, or a break in the wiring in the motor 100 or the AC output line 120. If they are in phase, current phase adjustment is performed using the remaining two normal phases, and the motor 100 is driven. As a result, the motor 100 can be driven without generating a large torque pulsation by generating a rotating magnetic field that smoothly rotates in the motor 100.
- the motor driving device 200 controls the driving of the motor 100 in which the electric windings 102a, 102b, 102c of each phase are provided independently of each other, and is supplied via the DC buses 201a, 201b.
- the inverter circuit 210 converts the direct current power into three-phase alternating current power and outputs the converted power to the electric windings 102a, 102b, and 102c of each phase, and the controller 203 for controlling the inverter circuit 210.
- the controller 203 cancels each other AC power in the normal phase other than the phase that has lost phase.
- the phase difference of each current flowing through the normal-phase electric element winding is adjusted. Since it did in this way, when the phase of one of the phases is lost during the driving of the motor 100, the driving of the motor 100 can be continued while suppressing the pulsation of the driving torque generated by the motor 100.
- the controller 203 sets the number of phases of the motor 100 as n and the number of phases as m as m.
- the phase difference of each current flowing through the normal-phase electric coil winding is adjusted so that the normal-phase AC powers cancel each other out when the power phase difference Dp (°) satisfies the above-described equation (8).
- various multi-phase motors of independent winding type other than the three-phase motors can suppress the pulsation of the drive torque when the phase is lost, and drive the motor. Can continue.
- the controller 203 adjusts the phase difference Di (°) of each current flowing through the normal-phase electric element winding so as to satisfy the above-described equation (9). Since it did in this way, regardless of the number of phases of a motor, the phase difference of each current which flows into a normal phase electric child winding can be adjusted appropriately, and each AC power of a normal phase can be canceled certainly.
- FIG. 12 is a diagram illustrating a state in which the W-phase bridge circuit 210c in the inverter circuit 210 has an off-failure in the motor driving device 200.
- FIG. 12 For example, as shown in FIG. 12, consider a case in which a failure occurs in the W-phase bridge circuit 210c, in which one of the IGBTs 221 always remains off and does not change. In this case, the bridge circuit 210c performs the same operation as the full-wave rectifier circuit.
- FIG. 15 is a diagram illustrating a current path in the W-phase bridge circuit 210c at the time of off-failure.
- the motor driving device 200 passes through each diode 222 included in the W-phase bridge circuit 210 c from the motor 100 due to an induced voltage generated in the W-phase armature winding 102 c in the motor 100. Current flows through This current causes brake torque and torque pulsation in the motor 100. Therefore, it is necessary to disconnect the faulty W-phase bridge circuit 210c from the motor 100 to prevent a current as shown in FIG.
- FIG. 16 is a diagram showing a current path when the W-phase bridge circuit 210c in the inverter circuit 210 is turned on in the motor drive device 200.
- FIG. 16 For example, as shown in FIG. 16, a case where a failure occurs in the W-phase bridge circuit 210c in which one of the IGBTs 221 is always in an on state and does not change is considered. In this case, since the IGBT 221 is short-circuited, an induced voltage generated in the W-phase armature winding 102c in the motor 100 causes a current to circulate in the W-phase bridge circuit 210c as shown in FIG. This current also causes brake torque and torque pulsation in the motor 100 as in FIG. Therefore, it is necessary to disconnect the faulty W-phase bridge circuit 210c from the motor 100 to prevent a current as shown in FIG.
- FIG. 17 is a diagram showing an example in which a power cutoff switch 213 is provided in each phase of the bridge circuits 210a, 210b, and 210c.
- the motor driving device 200 displays the controller 203 in FIG.
- the four switches 213 connected to the bridge circuit corresponding to the missing phase among the bridge circuits 210a, 210b, and 210c of each phase are opened.
- the bridge circuit corresponding to the phase that has lost phase in the inverter circuit 210 is disconnected from the DC buses 201a and 201b, and the AC power from the bridge circuit to the motor 100 is cut off. As a result, it is possible to prevent the drive of the motor 100 from being adversely affected by the current flowing through the circuit of the open phase portion.
- FIG. 18 is a diagram showing an example in which a power cutoff switch 214 is provided in each phase of the AC output line 120.
- the motor driving device 200 displays the controller 203 in FIG.
- the switch 214 provided in the middle of the AC output line corresponding to the phase out of phase of the AC output line 120 of each phase is opened.
- the armature windings corresponding to the phase that has lost phase among the armature windings 102a, 102b, and 102c of each phase are disconnected from the inverter circuit 210, and the AC power from the inverter circuit 210 to the armature winding is reduced. Cut off. As a result, it is possible to prevent a current from flowing through the circuit of the phase loss portion, and to avoid an adverse effect on the driving of the motor 100.
- the motor driving device 200 includes the switch 213 for disconnecting the phase corresponding to the phase that has lost phase in the inverter circuit 210 from the DC buses 201a and 201b, or each phase.
- the switch 214 further includes a switch 214 for disconnecting, from the inverter circuit, the armature winding corresponding to the phase that is out of phase among the armature windings 102a, 102b, and 102c. Since it did in this way, when the phase loss generate
- the independent winding type three-phase motor 100 capable of independently controlling the currents flowing through the respective phase element windings 102a, 102b, 102c has been described as an example.
- the present invention can also be applied to multi-phase motors other than three-phase motors. That is, if the present invention is applied to a motor driving device that controls the driving of an independent winding type multi-phase motor capable of independently controlling the currents flowing through the electric windings of each phase, The phase difference between the currents flowing in the normal-phase electric windings is adjusted so that the normal-phase AC powers cancel each other when any phase is lost in the AC power output to Can do.
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Abstract
Description
図1は、本発明の第1の実施形態に係るモータ駆動装置200の構成を示す図である。モータ駆動装置200は、ハイブリッド自動車(HEV)や電気自動車(EV)などに利用されるモータ100と接続されており、モータ100の駆動を制御する。モータ駆動装置200は、直流電源201、平滑コンデンサ202、制御器203およびインバータ回路210を有する。
Dp=360/2(n-m) ・・・(8)
ただし、n、mは正の整数であり、n≧m+2
Di=360/(n-m)-360/n ・・・(9)
本発明の第2の実施形態について以下に説明する。本実施形態では、モータ駆動装置200のインバータ回路210からモータ100に出力される交流電力においていずれかの相が欠相した場合に、その相の交流電力を遮断する例を説明する。
102a、102b、102c:電気子巻線
110:磁極位置検出器120:交流出力線
130:電流センサ
200:モータ駆動装置
201:直流電源201a、201b:直流母線
202:平滑コンデンサ
203:制御器
210:インバータ回路
210a、210b、210c:ブリッジ回路
221:IGBT
222:ダイオード
Claims (7)
- 各相の電気子巻線が互いに独立して設けられた多相モータの駆動を制御するモータ駆動装置であって、
直流母線を介して供給される直流電力を多相の交流電力に変換して前記各相の電気子巻線にそれぞれ出力するインバータ回路と、
前記インバータ回路を制御するための制御器と、を備え、
前記制御器は、前記交流電力においていずれかの相が欠相した場合に、前記欠相した相を除いた他の正常相の各交流電力が互いに相殺されるように、前記正常相の電気子巻線に流れる各電流の位相差を調整するモータ駆動装置。 - 請求項1に記載のモータ駆動装置において、
前記制御器は、前記交流電力においていずれかの相が欠相した場合に、前記モータの相数をn、前記欠相した相数をmとして、前記正常相の各交流電力の位相差Dp(°)が以下の式を満たすことで、前記正常相の各交流電力が互いに相殺されるように、前記正常相の電気子巻線に流れる各電流の位相差を調整するモータ駆動装置。
Dp=360/2(n-m)、ただし、n、mは正の整数であり、n≧m+2 - 請求項2に記載のモータ駆動装置において、
前記制御器は、前記交流電力においていずれかの相が欠相した場合に、前記正常相の電気子巻線に流れる各電流の位相差Di(°)が以下の式を満たすように調整するモータ駆動装置。
Di=360/(n-m)-360/n - 請求項1乃至3のいずれか一項に記載のモータ駆動装置において、
前記モータは、三相の電気子巻線が互いに独立して設けられた三相モータであり、
前記制御器は、前記交流電力においていずれか一相が欠相した場合に、前記欠相した相を除いた他の二つの正常相の各交流電力が互いに相殺されるように、前記二つの正常相の電気子巻線に流れる各電流の位相差を調整するモータ駆動装置。 - 請求項2または3に記載のモータ駆動装置において、
n=3、m=1であるモータ駆動装置。 - 請求項1乃至3のいずれか一項に記載のモータ駆動装置において、
前記インバータ回路のうち前記欠相した相に対応する部分を前記直流母線から切り離すための第1のスイッチをさらに備えるモータ駆動装置。 - 請求項1乃至3のいずれか一項に記載のモータ駆動装置において、
前記欠相した相に対応する電気子巻線を前記インバータ回路から切り離すための第2のスイッチをさらに備えるモータ駆動装置。
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