TWI415379B - Apparatus and method for post-fault control strategy for ac motor drives with six-leg three-phase inverter - Google Patents

Abstract

A control device contains: an ac motor, a position detecting unit, a dc/ac inverter, a current sensor, and a control unit. The ac motor's neutral point is disassembled for making each phase winding distinction to be independent. Each winding of the dc/ac inverter is connected to two separately controlling legs for yielding single phase dc/ac inverter respectively. The position detecting unit can measure the position and speed of the motor. The current sensor detects a three-phase feedback current of motor. When the three-phase feedback currents RMS of the motor are not zero, the control unit selects pre-fault control strategy to drive the motor. When one of the three-phase feedback currents RMS of the motor equals to zero, that means the corresponding phase winding or controlling legs fails, so the control unit selects post-fault control strategy to drive the motor.

Description

Operation control device after failure of AC motor and control method thereof

The present invention relates to an operation control device for an electric motor, and more particularly to an operation control device for an AC motor and a post-fault control strategy.

The permanent magnet synchronous motor is driven by a three-phase current to generate a stable and fixed rotating magnetic field to provide a smooth running torque of the motor. Since the permanent magnet synchronous motor replaces the excitation field winding with a high-performance permanent magnet, it can be used. The mechanical structure such as the commutator and the brush is removed, the rotor structure is simplified, and the advantages of high power density and miniaturization are obtained. In this way, the rotor magnetic field of the permanent magnet synchronous motor can be fixed, and the electromagnetic torque has a linear relationship with the current.

The converter structure of a three-phase motor is generally a three-arm type three-phase converter for its power architecture. This architecture uses voltage space vector pulse-width modulation (VSVPWM) to generate the required voltage vector by switching six sets of switches. This control technology is mature and development has become stable, but its voltage usage can only reach 0.577 times of the DC link voltage. It must be controlled by field weakening or phase advance control to increase the speed of the motor. Moreover, when a phase winding or an arm power stage transistor fails, the motor will violently shake or stop running. In order to improve this shortcoming, the three-phase motor converter can adopt a four-arm type three-phase converter as its power circuit structure, so that the neutral point of the motor is also connected to one arm and two power stage transistors to make one phase winding. Or after the failure of one arm power stage transistor, the circuit can be made up of a non-faulty two-phase winding and a neutral point to keep the motor running; but this control mode, the potential of the two-phase winding in the motor is not faulty. The same phase as the feedback current will generate the second harmonic component of the power of the motor, which will affect the motor torque ripple and cause jitter and noise.

The control method of the permanent magnet synchronous motor is generally to divide the three-phase balance by one hundred and twenty degrees of the AC physical quantity, and project the two-phase mutually perpendicular DC quantity through the rotor rotating coordinate axis conversion matrix to perform current control in each direction, that is, For vector control. In the vector control, in order to effectively generate the torque, the position of the magnetic pole angle must be detected to realize the conversion of the rotary coordinate axis.

In view of the above, an object of the present invention is to improve the power circuit architecture and control strategy of the motor carrier operation control device, so that the permanent magnet synchronous motor can smoothly operate even when one phase winding or one arm power stage transistor fails. The control device is operated to feedback the rotational speed and current of the permanent magnet synchronous motor, thereby judging the operating condition of the system to complete the control strategy before and after the system failure.

In order to solve the above problems, according to one aspect of the present invention, an operation control apparatus includes: a motor, an angular position detecting unit, a current detecting circuit, and a control unit. The angular position detecting unit is mounted on the motor to generate a magnetic pole angle detecting signal for calculating a magnetic pole angular position of the motor and an estimated rotational speed. The current detecting circuit is coupled to the input end of the motor for detecting a three-phase feedback current on one side of the motor. The control unit judges the operation condition of the system according to one side three-phase feedback current, and generates an actual magnetic pole angle position and an estimated motor rotation speed by the angular position detecting unit, thereby completing the fault and before the failure of the motor vehicle driving system. Control strategy.

In particular, the present invention further provides a converter power circuit structure that is applied to the operation control device of the above embodiment, and the power circuit structure includes: an electric motor and a plurality of power stage transistors. Wherein, the winding structure of the motor disassembles the neutral point, so that each phase winding is independent, and the two ends of each phase winding are respectively coupled to one arm and two power stage transistors, so that each winding and each The arm power stage transistor forms a single phase DC/AC power converter, and its control technique uses unipolar sinusoidal pulse width modulation to bring its voltage closer to the DC link voltage.

According to another aspect of the present invention, a control method for an operation control device is provided. The operation control device has a permanent magnet synchronous motor, and the steps of the control method include: first, generating by an angular position detecting unit A magnetic pole angle detecting signal estimates a magnetic pole angular position and an estimated rotational speed, and calculates an alternating current command according to the estimated rotational speed, performs a closed loop control of the motor, and sets the constant current command to zero. Then, a three-phase feedback current of the motor is obtained to calculate an effective value of the three-phase feedback current on the motor side, and the motor side is rotated according to the rotary coordinate axis conversion matrix according to the magnetic pole angle position provided by the angular position detecting unit. The three-phase feedback current is converted to a cross-axis current command and a direct-axis current command for current closed loop control. Moreover, when the effective value of the three-phase feedback current on one side of the motor is not zero, the operation control device of the motor uses a pre-failure control strategy, which is to treat one side of the three-phase feedback current as balanced and different from each other. The phase angle of one hundred and twenty degrees, and each of the three-phase feedback currents on the motor side is also in phase with the corresponding potential.

When one of the motor's single-phase feedback current rms value is zero, the motor's operation control device uses a post-fault control strategy, which is to separate the two phases of the single-phase feedback currents that are not faulty by sixty degrees. The phase angle and the two single-phase feedback currents of the motor that are not faulty are respectively ahead or behind the respective potentials of thirty degrees, thereby coupling the second harmonic component of the power to stabilize the torque operation. Further, when the effective value of the three-phase feedback current of one side of the motor is not zero, the normal rotary coordinate axis inverse conversion matrix is used, and the cross-axis voltage command and the straight-axis voltage command of the current control adjustment output are converted into one. Three-phase voltage command to drive the operation of the DC/AC power converter; when the effective value of one of the single-phase feedback currents of the motor is zero, the motor's operation control device uses the post-fault control strategy to close the faulty phase The control signal is driven, and the rotating coordinate axis inverse conversion matrix of the phase fault is used, and the cross-axis voltage command of the current control adjustment output and the direct-axis voltage command are converted into three-phase voltage commands to drive the operation of the DC/AC power converter.

Therefore, the achievable effect of the present invention is that the permanent magnet synchronous motor can continue to operate after the failure of the one-arm power stage transistor or the one-phase winding, and the inverse rotation matrix of the rotating coordinate coordinate of the phase is caused. The remaining unbroken two-phase currents are different from each other by a phase angle of sixty degrees, and the second harmonic of the coupled power reduces the chopping component of the torque to achieve the purpose of improving the stability and safety of the drive control system.

The above summary, the following detailed description and the annexed drawings are intended to further illustrate the manner and Other objects and advantages of the invention will be set forth in the description and drawings.

In the operation control device of the present invention, the rotor magnetic field of the permanent magnet synchronous motor has a constant value, so that the electromagnetic torque has a linear relationship with the current. The invention is designed to utilize the six-arm type three-phase converter as the structure of the power circuit, and to control the motor before and after the fault, and to match the magnetic pole angle detection signal to complete the motor speed and current closed loop control. In order to simplify the description, the motor mentioned in the following embodiments has an electronic excitation structure of twelve slots and a rotor excitation structure of fourteen poles.

Please refer to the first figure, which is a block diagram of an embodiment of the operation control device 1 of the present invention. As shown in the figure, the present embodiment provides an operation control device 1 for driving a mechanical load 2, and the operation control device 1 includes: a motor 10, an angular position detecting unit 11, a current detecting circuit 12, and a control Unit 13 and DC/AC power converter 14.

The motor 10 is, for example, a three-phase permanent magnet synchronous motor. The angular position detecting unit 11 is configured to sense the rotation of the permanent magnet synchronous motor to generate a magnetic pole angle detecting signal, and the angular position detecting unit 11 can be used as a motor. The detection of the absolute position of 10. In actual design, the angular position detecting unit 11 can calculate an element for determining the rotational speed and the angular position, for example, an encoder, a resolver, and a Hall effect detecting element. In this embodiment, six Hall effect detection elements are designed. The six Hall effect detection elements generate six magnetic pole angle detection signals and detect twelve state changes in one motor cycle. Each state is a motor angle of thirty degrees, from which an estimated rotational speed and a magnetic pole angular position are obtained.

The current detecting circuit 12 is coupled to the input end of the motor 10 to detect a three-phase feedback current of one side of the motor 10, and is provided for use by the control unit 13. Thereby, the control unit 13 performs a closed-loop control of the motor 10 according to the estimated rotational speed, and determines the effective value of each single-phase feedback current among the three-phase feedback currents of the motors 10 to determine the motor 10 In the operation of the operation control device 1, the control unit 13 is provided to control the control strategy before and after the failure, and to perform a current closed loop control of the motor 10 according to the three-phase feedback current and the magnetic pole angle position.

The control unit 13 detects one of the three-phase feedback currents detected by the current detecting circuit 12 to perform the calculation of the effective value, and each single-phase feedback of the three-phase feedback currents of the one side of the motor 10 When the effective value of the current is not zero, it is based on the control strategy before the motor 10 fails; when one of the three-phase feedback currents of one side of the motor 10 has a valid value of zero for any single-phase feedback current, it indicates an effective value. If the phase winding corresponding to the single-phase feedback current or the arm power stage transistor fails, the control strategy after the failure of the motor 10 is used, and the operation control device 1 must cut off the drive control signal of the fault phase. The magnetic pole angle detecting signal and the current detecting circuit 12 provided by the angular position detecting unit 11 detect one side three-phase feedback current to perform the speed closed loop control and the current closed loop control. Finally, the DC/AC power converter 14 is coupled to the control unit 13 and the motor 10, and receives the control signal of the control unit 13 and performs DC/AC conversion to drive the operation of the motor 10, thereby driving the mechanical load 2 run.

In order to be able to improve the actual design principles and detailed operation procedures of the present invention, please refer to the second figure and its description. The second figure is a circuit block diagram of an embodiment of the control unit 13 of the present invention. As shown in the figure, the control unit 13 provided in this embodiment belongs to a digital signal processor (DSP), and includes: a digital input unit 1301, an angular position estimating unit 1302, a rotational speed estimating unit 1303, and an analog/digital conversion. The device 1304, a fault determining unit 1305, a rotating coordinate axis matrix converter 1306, a current controller 1307, a voltage command value calculating unit 1308, a pulse width modulation unit 1309, and a speed controller 1310.

The digital input unit 1301 is a coupled angular position estimating unit 1302. In this embodiment, the magnetic pole angle detecting signals ( H _a , H _b generated by the six Hall effect detecting elements of the angular position detecting unit 11 are used. , H _c , H _x , H _y , H _z ). The angular position estimating unit 1302 is coupled to the digital input unit 1301, and calculates a conversion according to the magnetic pole angle detecting signals ( H _a , H _b , H _c , H _x , H _y , H _z ) to generate a magnetic pole angular position (θ _r ).

The rotational speed estimating unit 1303 is configured to obtain a measured rotational speed (ω _m ) of the motor 10 through a change in the magnetic pole angle detecting signal to complete a rotational speed closed loop control. The analog/digital converter 1304 is coupled to the current detecting circuit 12 for detecting the three-phase feedback current ( i _a , i _b , i _c ) on one side of the motor 10 and performing analog/digital conversion.

The fault determining unit 1305 is coupled to the analog/digital converter 1304 and the voltage command value calculating unit 1308. The three-phase feedback of the current motor 10 is performed by the following formula (1), formula (2) and formula (3). The current is calculated, and the effective values of each single-phase feedback current ( I _a(rms) , I _b(rms) , I _c(rms) ) are obtained, and the formula (4), formula (5), and formula (six) are transmitted. ) and formula (VII) of the judgment, to produce a decision signal represents the normal operation of f _n, determining a phase of the fault signal f _1, the fault determination of the b-phase signal and f ₂ c determines the phase fault signal f _3. For the relationship between the fault determination signal and the operation decision of the operation control device 1, reference may be made to the third embodiment of the present invention for the fault determination signal and the operational control device 1 operation decision, thereby determining the operation of the motor 10.

Where T _s is the calculation period of the RMS program.

When I _{a ( rms )} ≠ 0, I _{b ( rms )} ≠ 0, I _{c ( rms )} ≠ 0 then f _n =1, otherwise f _n =0 formula (4)

When I _{a ( rms )} =0, I _{b ( rms )} ≠ 0, I _{c ( rms )} ≠ 0 then f ₁ =1, otherwise f ₁ =0 formula (5)

When I _{a ( rms )} ≠ 0, I _{b ( rms )} =0, I _{c ( rms )} ≠ 0 then f ₂ =1, otherwise f ₂ =0 formula (6)

When I _{a ( rms )} ≠ 0, I _{b ( rms )} ≠ 0, I _{c ( rms )} =0 then f ₃ =1, otherwise f ₃ =0 formula (7)

Where f _n is a judgment signal for normal operation, f ₁ is a judgment signal for a phase failure, f ₂ is a judgment signal for b phase failure, and f ₃ is a judgment signal for a c phase failure.

The rotating coordinate axis matrix converter 1306 is coupled to the analog/digital converter 1304, and converts one side three-phase feedback current ( i _a , i _b , i _c ) into a quadrature feedback current according to the magnetic pole angular position (θ _r ). Continuous axis feedback current . The current controller 1307 is a coupled voltage command value calculation unit 1308, according to a cross-axis current command, a constant-axis current command And the rotary coordinate axis matrix converter 1306 provides the cross-axis feedback current, the direct-axis feedback current Perform a comparison operation and pass the resulting error amount through the output signal of the current regulator ( G _q , G _d ) (not shown) to obtain the cross-axis voltage command and the direct-axis voltage command. .

The voltage command value calculation unit 1308 is coupled to the current controller 1307, and according to the rotation coordinate axis inverse conversion matrix of the formula (8), and modified and corrected for each phase failure condition, the rotary coordinate axis of the a- phase fault of the formula (9) is obtained. The inverse transformation matrix, the inverse coordinate matrix of the rotating coordinate axis of the b- phase fault of the formula (10), and the inverse coordinate matrix of the rotary coordinate axis of the c- phase fault of the formula (11), so that after one-phase winding or one-arm power stage transistor fails, The two phase single-phase feedback currents of the fault are 30 degrees apart from the corresponding potentials, and the two single-phase feedback currents of the faults are different from each other by a phase angle of sixty degrees. Then, by the fault determination signals ( f _n , f ₁ , f ₂ , f ₃ ) provided by the fault judging unit 1305, the inverse coordinate matrix inverse conversion matrix to be used is determined, and a cross-axis voltage command and a constant-axis voltage command are commanded. Convert to a three-phase voltage command . The pulse width modulation unit 1309 is a coupling voltage command value calculation unit 1308 that receives a three-phase voltage command. And calculate the reverse three-phase voltage command Then, compared with the high frequency triangular wave, the unipolar sinusoidal pulse width modulation is completed, thereby driving and controlling the operation of the DC/AC power converter 14. Wherein, when the control strategy of the one-phase fault is adopted, it is necessary to turn off the unused sinusoidal pulse width modulation signal to avoid the DC/AC power converter 14 driving error. When the system is operating normally ( f _n =1):

A phase fault in the system 1. (f ₁ = ₁₎ when:

2. When the system is faulty in b phase ( f ₂ =1):

3. When the system is faulty in c phase ( f ₃ =1):

among them, The inverse coordinate matrix of the rotating coordinate axis of the system under normal operation, The inverse coordinate matrix of the rotating coordinate axis of the system under the fault of phase a , The inverse coordinate matrix of the rotating coordinate axis of the system under b- phase fault, The system is the inverse coordinate matrix of the rotating coordinate axis under the c- phase fault, and θ _r is the magnetic pole angular position.

In the control unit 13 of the speed controller 1310 is coupled to the rotation speed estimation unit 1303, in which the speed controller comprises a speed regulator 1310 (G _s, not shown), the rotational speed controller (G _s) for receiving a rotational speed The estimated rotational speed (ω _m ) calculated by the estimating unit 1303 and the set rotational speed command A speed error amount (Δω _m ) formed between the two is calculated and converted by the speed regulator ( G _s ) to output a torque command . Also, in order to design the electromagnetic torque ( T _e ) and the cross-axis feedback current Linear relationship to meet current control of current controller 1307, so in direct current command The aspect will be set to zero, making it a torque command With the axis current command It is also linear. Due to electromagnetic torque command Straight axis current command Zero time, and the direct axis feedback current Follow the straight axis current command value Electromagnetic torque command With the axis current command Is a linear relationship.

Therefore, the above-described design principle of the control unit 13 and its associated operational program description can be used as a basis for the implementation of the present invention, and the closed loop control of the rotational speed and current of the motor 10 can be completed.

In the power circuit structure of the DC/AC power converter 14 used in the present invention, the present invention adopts a six-arm type three-phase change in order to continue operation after one phase winding or one arm power stage transistor failure. The power circuit structure of the flow device. In this regard, please refer to the fourth figure, which is a schematic diagram of an embodiment of a power circuit of a six-arm type three-phase converter according to the present invention. The power circuit of the six-arm type three-phase converter of the embodiment is designed to include six-arm power stage transistors, and each arm is composed of two power stage transistors, that is, a total of twelve power stage transistors The structure that constitutes its power circuit. And disassemble the neutral point of the motor 10, so that the two ends of each phase winding ( a ₁ , a ₂ , b ₁ , b ₂ , c ₁ , c ₂ ) are respectively coupled to an arm power stage transistor, and then cooperate with the DC link. The voltage ( v _dc ) causes each phase to form a single-phase DC/AC power converter, allowing each phase winding to be independently driven and controlled; therefore, after a phase winding or an arm power stage transistor failure, The other two-phase windings that are not faulty provide the electromagnetic torque required for the motor 10 to operate, continuously driving the mechanical load 2 to operate.

Please refer to the fifth figure again, which is a flow chart of an embodiment of the control method of the operation control device 1 of the present invention. In the control method of the present reference embodiment, the related architecture diagram of the operation control device 1 can refer to the descriptions of the first diagram and the second diagram. As shown in the fifth figure, the present embodiment provides a control method for the motor 10 operation control device 1, and can be applied to the operation of one phase winding or one arm power stage transistor failure of the system, the steps of which include: When the operation control device 1 is started up, an estimated rotational speed of the motor 10 is calculated, and the magnetic pole angle detection signal sensed by the angular position detecting unit 11 is calculated to obtain a magnetic pole angular position (S501). Then, the direct-axis current command is set to zero, the electromagnetic torque command is linearly related to the cross-axis current command, and the estimated rotational speed is compared with a rotational speed command previously used for control, thereby generating a rotational speed error amount. The calculation of the rotational speed control is performed to output a torque command, and the conversion is performed accordingly to generate an AC current command, thereby completing the closed loop control of the motor 10 (S503).

Furthermore, the three-phase feedback current of the motor 10 is obtained, and the current RMS value is calculated by the three-phase feedback current of the motor 10, thereby determining whether the effective value of one single-phase feedback current is zero or None of them is zero to generate a fault determination signal; and the resulting three-phase feedback current of the motor 10 is converted into a quadrature feedback current and a constant axis feedback current according to a magnetic pole angular position (S505). Then, according to the cross-axis feedback current, the direct-axis feedback current and the cross-axis current command, and the direct-axis current command, the current adjustment control is performed to convert into a cross-axis voltage command and a constant-axis voltage command (S507). Then, the fault determination signal is used to determine the fault condition of the system to determine the rotation coordinate axis inversion matrix (S509). If the judgment result in step S509 is normal operation, it indicates that the motor 10 and the DC/AC power converter have not failed. Therefore, the rotary coordinate axis inverse conversion matrix of the motor 10 under normal operation is used, and the cross-axis voltage command and the direct-axis voltage command are converted and output as a three-phase AC voltage command (S511). When the result of the determination in step S509 is a phase failure, the a phase winding of the motor 10 or the a phase single phase DC/AC power converter fails, the pulse width modulation of the a phase single phase DC/AC power converter is turned off. The signal is changed (S513). Then, using the rotary coordinate axis inverse conversion matrix of the a- phase fault, the cross-axis voltage command and the direct-axis voltage command are converted and output as a three-phase AC voltage command (S515). When the result of the determination in step S509 is a b- phase failure, the b- phase winding of the motor 10 or the b- phase single-phase DC/AC power converter fails, the pulse width modulation of the b- phase single-phase DC/AC power converter is turned off. Change the signal (S517). Then, using the rotary coordinate axis inverse conversion matrix of the b- phase fault, the cross-axis voltage command and the direct-axis voltage command are converted and output as a three-phase AC voltage command (S519). When the result of the determination in step S509 is c- phase failure, the c- phase winding representing the motor 10 or the c- phase single-phase DC/AC power converter fails, the pulse width modulation of the c- phase single-phase DC/AC power converter is turned off. Change the signal (S521). Then, using the rotary coordinate axis inverse conversion matrix of the c- phase fault, the cross-axis voltage command and the direct-axis voltage command are converted and output as a three-phase AC voltage command (S523).

After the above steps, the three-phase voltage command can be obtained, then the reverse three-phase voltage command is calculated, and the three-phase voltage command and the reverse three-phase voltage command are compared with the high-frequency triangular wave for unipolar sine The pulse width modulation control (S525), whereby the output is used to drive the operation of the DC/AC power converter 14 (S527). In this way, the current closed loop control of the motor 10 can be completed by the three-phase feedback current and the magnetic pole angular position on the motor 10 side.

In summary, in the operation control device, the present invention can independently control each phase winding of the motor by disassembling the neutral point of the motor and improving the power circuit architecture of the DC/AC power converter, and matching the feedback motor. The speed and current are adjusted and controlled to complete the closed loop control of the speed and current. Thereby, even if one phase winding or one arm power stage transistor fails, it can continue to operate and improve the stability of the operation control device.

In addition, in the design of the operation control device of the present invention, in addition to the continuous operation of a phase winding or an arm power stage transistor, the currents of the unbroken two-phase windings are further designed to be different from each other by sixty degrees. The angle, thereby coupling the power second harmonic component generated by the failure of a phase winding or an arm power stage transistor, thereby reducing the torque ripple of the motor and making the operation of the motor smoother.

The above is only the detailed description and illustration of the specific embodiments of the present invention, and is not intended to limit the invention, and all the scope of the invention is based on the following claims. Any variation or modification that can be readily conceived by those skilled in the art in the field of the invention can be covered by the scope of the patents defined in the following.

1. . . Operation control device

10. . . electric motor

11. . . Angular position detection unit

12. . . Current detection circuit

13. . . control unit

1301. . . Digital input unit

1302. . . Angular position estimation unit

1303. . . Speed estimation unit

1304. . . Analog/digital converter

1305. . . Fault judging unit

1306. . . Rotary coordinate axis matrix converter

1307. . . Current controller

1308. . . Voltage command value calculation unit

1309. . . Pulse width modulation unit

1310. . . Speed controller

14. . . DC/AC power converter

2. . . Mechanical load

S501~S527. . . Step description of the flowchart

The first drawing is a block diagram of an embodiment of the operation control device of the present invention;

The second drawing is a block diagram of an embodiment of the control unit of the present invention;

The third figure is a schematic diagram of an embodiment of the fault determination signal and the operation control device operation decision of the present invention;

4 is a schematic diagram of an embodiment of a power circuit structure of a DC/AC power converter of the present invention; and

Figure 5 is a flow chart showing an embodiment of the control method of the operation control device of the present invention.

1. . . Operation control device

10. . . electric motor

11. . . Angular position detection unit

12. . . Current detection circuit

13. . . control unit

14. . . DC/AC power converter

2. . . Mechanical load

Claims (8)

An operation control device includes: an electric motor; an angular position detecting unit coupled to the motor to sense rotation of the motor to generate a magnetic pole angle detecting signal; and a current detecting circuit coupled to the electric motor An input terminal for detecting a three-phase feedback current of the motor; a control unit coupled to the current detecting circuit, and a plurality of single-phase feedback currents on the side of the motor When the effective value of the phase feedback current is not zero, it is based on the control strategy before the motor failure; and when the effective value of one of the single-phase feedback currents of the motor is zero, it indicates that the motor corresponds to When the one-phase winding or one power-level transistor of the single-phase feedback current with zero RMS is faulty, the control strategy after the motor failure is used, and the operation control device is cut off corresponding to the effective value of zero. One-phase driving control signal of single-phase feedback current; the control unit performs rotation coordinate axis conversion according to the three-phase feedback current of the one side of the motor and a magnetic pole angular position to realize the electric a current closed circuit of the machine, and performing a closed loop control of the motor according to an estimated rotational speed of the motor; and a DC/AC power converter coupled to the motor and the control unit, and accepting The control unit outputs a control signal to complete the DC/AC conversion to drive the operation of the motor, wherein the neutral point of the motor is disassembled so that each of the phase windings is independent. The operation control device according to claim 1, wherein the angular position detecting unit is an encoder, a resolver or a Hall effect detecting element. One or a combination of the plurality of components is an element capable of calculating and obtaining the position of the magnetic pole of the motor and the estimated rotational speed. The operation control device of claim 1, wherein the control unit further comprises: an analog/digital converter coupled to the current detecting circuit for detecting the three-phase of the motor Retrieving current and performing analog/digital conversion; a digital input unit coupled to the angular position detecting unit for receiving the magnetic pole angle detecting signal generated by the angular position detecting unit; and a rotational speed estimating unit And coupled to the digital input unit, according to the change of the magnetic pole angle detection signal, calculated to obtain the estimated rotational speed of the motor; a rotational speed controller is connected to the rotational speed estimating unit to receive the estimated The speed conversion output is used to generate a cross-axis current command; a fault judging unit is coupled to the analog/digital converter to calculate the current three-phase feedback current of the side of the motor, and obtain each single-phase feedback An effective value of the current to generate a fault determination signal; a rotating coordinate axis matrix converter coupled to the analog/digital converter, the side of the motor according to the magnetic pole angular position The phase feedback current is converted into an AC-axis feedback current and a constant-axis feedback current; a current controller is coupled to the rotation speed controller and the rotating coordinate axis matrix converter, according to the cross-axis current command, the constant-axis current command And the rotary coordinate axis matrix converter provides the cross-axis feedback current and the direct-axis feedback current, and converts the output to obtain a cross-axis voltage command and a constant-axis voltage command; a voltage command value calculation unit is connected to the current control Device, the fault judgment The breaking unit and the angular position estimating unit receive the fault determining signal to select the rotating coordinate axis inverse conversion matrix, and according to the fault determining signal of the fault determining unit and the current controller, the output of the cross-axis voltage command and the constant-axis voltage Commanding, in conjunction with the angular position of the magnetic pole output of the angular position estimating unit, generating a three-phase voltage command of the motor; and a pulse width modulation unit coupled to the voltage command value calculating unit to receive the three-phase voltage Command and perform unipolar sinusoidal pulse width modulation to drive control of the operation of the DC/AC power converter. The operation control device according to claim 3, wherein the voltage command value calculation unit includes a control strategy before the failure, and the conversion is performed by using a non-faulted rotary coordinate axis inverse conversion matrix to output the three-phase voltage command. Each single-phase feedback current in the side three-phase feedback current is regarded as a phase angle which is balanced and different from each other by one hundred and twenty degrees, and the single-phase feedback currents of the three-phase feedback current of the one side of the motor are The respective corresponding potentials are in phase. The operation control device according to claim 3, wherein the voltage command value calculation unit includes a control strategy after the failure, and sets a rotation coordinate axis inverse conversion matrix using the fault phase to convert and output the three-phase voltage command, and closes the fault phase. The pulse width modulation signal is such that the two faulty two-phase feedback currents are different from each other by a phase angle of sixty degrees, and the two non-faulty single-phase feedback currents of the motor are respectively advanced or backward. The potential should be 30 degrees phase angle. The operation control device of claim 1, wherein one arm and two power stage transistors of the DC/AC power converter are respectively coupled to both ends of each phase winding, so that each phase winding is Each power stage transistor A single phase DC/AC power converter is formed. A control method for an operation control device has an electric motor, the control method comprising: calculating an estimated rotational speed and a magnetic pole angular position of the electric motor; setting a constant current command to zero, and converting according to the estimated rotational speed Generating a cross-axis current command to complete a motor speed closed-loop control of the motor; obtaining a three-phase feedback current of the motor on one side, and using the three-phase feedback current of the one side of the motor to perform current RMS and a quadrature axis The feedback current and the constant axis feedback current are calculated, and a fault judgment signal is generated; and the current adjustment control is performed according to the cross shaft feedback current, the direct axis feedback current and the cross shaft current command, and the direct axis current command, Converting a cross-axis voltage command and a constant-axis voltage command; determining a fault condition of the system according to the fault determination signal to determine a form of a rotary coordinate axis inverse conversion matrix; if the fault determination signal of the motor is normally operating According to the rotating coordinate axis inverse conversion matrix of the motor under normal operation, the cross shaft voltage command and the straight shaft voltage Order to convert a three-phase voltage command output; if the motor of the system displaying the fault signal of a motor when a phase fault, a closed a single phase DC / AC power converter pulse width modulation signal, based on a rotating coordinate axis inverse conversion matrix of the motor under the a- phase fault, converting the cross-axis voltage command and the straight-axis voltage command to the three-phase voltage command; if the fault determination signal of the motor is a one of the motor In the b- phase fault, the pulse width modulation signal of a b- phase single-phase DC/AC power converter is turned off, according to the rotation coordinate axis inverse conversion matrix of the motor under the b- phase fault, the cross-axis voltage command and the straight The shaft voltage command conversion output is the three-phase voltage command; if the fault determination signal of the motor indicates a c- phase fault of the motor, turning off the pulse width modulation signal of a c- phase single-phase DC/AC power converter , based on the coordinate axis of rotation of the motor at the c-phase fault inverse transform matrix, and the cross-axis voltage command and converts the direct axis voltage command for the three-phase output voltage commands Performing a current closed loop control of the motor according to the three-phase feedback current of the one side of the motor and the magnetic pole angle position; and calculating a reverse three-phase voltage command according to the three-phase voltage command of the motor, The unipolar sinusoidal pulse width modulation control is performed to control the DC/AC power converter of the operation control device. The control method of the operation control device according to claim 7, wherein the failure determination signal is set to have a valid value of one of the plurality of single-phase feedback currents of the three-phase feedback current of the one side being zero In the case, or the case where the single-phase feedback current RMS values are not zero, the fault determination signal of the motor is generated.