Motor drive control apparatus
On end of a reactor (L 1 ) is connected to a positive electrode of a battery (B 1 ) and the other end is connected to a power line via a transistor (Q 1 ) and to the ground via a transistor (Q 2 ). By PWM control of the transistors (Q 1 , Q 2 ), an arbitrary increased voltage is obtained in the power line. It is possible to obtain an optimal inverter input voltage (power line voltage) according to the motor drive state, thereby increasing efficiency. Thus, it is possible to optimize the inverter input voltage according to the motor drive condition.
1. A motor drive controller, for supplying output of a dc power source to a first motor through an inverter and controlling drive of the first motor, comprising:
a converter for voltage converting output voltage from the dc power source for supply to the inverter; and
a control section for controlling supply current to the first motor through PWM control of the inverter,
the inverter comprising a U phase arm, a V phase arm and a W phase arm, each of the U phase arm, the V phase arm and the W phase arm including two transistors connected in series,
the converter comprising:
a reactor connected at one end to the dc power source, and at least two switching elements, being an upper switching element connecting the other end of the reactor to a power source side of the inverter and a lower switching element connecting to an earth side of the inverter, wherein
the control section calculates an inverter input voltage target value appropriate to efficient motor drive in response to rotational speed of the first motor and a target output torque, and performs PWM control of the converter switching elements in order to achieve the input voltage target value, and
a separate inverter for supplying current to a second motor is connected to the output of the converter, and the control section outputs a higher voltage of two inverter input target voltages calculated from rotational speeds and target outputs of the first and second motors.
2. The motor drive controller of claim 1 , wherein the converter has a three phase structure provided with three sets of the reactor and two switching elements.
3. The motor drive controller of claim 2 , wherein, when the inverter input voltage target value is lower than the dc source voltage, the upper switching element of the inverter is turned on and the lower switching element is turned on.
4. The motor drive controller of claim 1 , wherein the converter has a full bridge configuration with both ends of a battery and one end of a reactor being connected through two switching elements.
5. The motor drive controller of claim 1 , wherein, when the calculated inverter input target voltage exceeds a specified upper limit value, the control section sets the input target voltage to the upper limit value.
6. A motor drive control method, for a two motor system comprising a converter, including a reactor, having one end connected to a dc power source, and at least two switching elements, being an upper switching element connecting another end of the reactor to a power source side of a first inverter, and a lower switching element connecting to an earth side of the first inverter; second and third inverters for receiving output from the converter and converting to a specified alternating current, and two motors respectively driven by alternating current from the second and third inverters wherein
inverter input voltage target values suitable for efficient drive of the two motors are calculated in response to rotation speed and target output torque of the two motors to provide two calculated inverter input voltage target values, and of the two calculated inverter input voltage target values, a higher voltage is selected as a target value and the switching elements of the first inverter are subjected to PWM control.
7. A computer-readable medium encoded with a computer-executable motor drive control program for a two motor system, the two motor system comprising a converter, including a reactor, having one end connected to a dc power source, and at least two switching elements, being an upper switching element connecting another end of the reactor to a power source side of a first inverter, and a lower switching element connecting to an earth side of the first inverter; second and third inverters for receiving output from the converter and converting to a specified alternating current, two motors respectively driven by alternating current from the second and third inverters, and a control section for controlling switching of the switching elements of the converter, the motor drive control program containing instructions to intruct the control section to calculate inverter input voltage target values to provide two calculated inverter input voltage target values suitable for efficient drive of the two motors in response to rotation speed and target output torque of the two motors, adopt a higher voltage of the two calculated inverter input voltage target values as a target value, and subject the switching elements of the first inverter to PWM control so that converter output becomes the adopted target value.
8. The motor drive controller of claim 2 , wherein, when the inverter input voltage target value is lower than the dc source voltage, the upper switching element of the inverter is turned on and the lower switching element is turned on.
9. The motor drive controller of claim 2 , wherein the converter has a full bridge configuration with both ends of a battery and one end of a reactor being connected through two switching elements.
10. A motor drive controller, for supplying output of a dc power source to a first motor through an inverter and controlling drive of the first motor, comprising:
a converter for voltage converting output voltage from the dc power source for supply to the inverter; and
a control section for controlling supply current to the first motor through PWM control of the inverter,
the inverter comprising a U phase arm, a V phase arm and a W phase arm, each of the U phase arm, the V phase arm and the W phase arm including two transistors connected in series,
the converter comprising:
a reactor connected at one end to the dc power source, and at least two switching elements, being an upper switching element connecting the other end of the reactor to a power source side of the inverter and a lower switching element connecting to an earth side of the inverter, wherein
the control section calculates an inverter input voltage target value appropriate to efficient motor drive in response to rotational speed of the first motor and a target output torque, and performs PWM control of the converter switching elements in order to achieve the input voltage target value,
wherein the converter has a three phase structure provided with three sets of the reactor and two switching elements,
wherein a separate inverter for supplying current to a second motor is connected to the output of the converter, and the control section outputs a higher voltage of two inverter input target voltages calculated from rotational speeds and target outputs of the first and second motors.
11. A motor drive controller, for supplying output of a dc power source to a first motor through an inverter and controlling drive of the first motor, comprising:
a converter for voltage converting output voltage from the dc power source for supply to the inverter; and
a control section for controlling supply current to the first motor through PWM control of the inverter,
the inverter comprising a U phase arm, a V phase arm and a W phase arm, each of the U phase arm, the V phase arm and the W phase arm including two transistors connected in series,
the converter comprising:
a reactor connected at one end to the dc power source, and at least two switching elements, being an upper switching element connecting the other end of the reactor to a power source side of the inverter and a lower switching element connecting to an earth side of the inverter, wherein
the control section calculates an inverter input voltage target value appropriate to efficient motor drive in response to rotational speed of the first motor and a target output torque, and performs PWM control of the converter switching elements in order to achieve the input voltage target value,
wherein, when the inverter input voltage target value is lower than the dc source voltage, the upper switching element of the inverter is turned on and the lower switching element is turned on,
wherein a separate inverter for supplying current to a second motor is connected to the output of the converter, and the control section outputs a higher voltage of two inverter input target voltages calculated from rotational speeds and target outputs of the first and second motors.
12. A motor drive controller, for supplying output of a dc power source to a first motor through an inverter and controlling drive of the first motor, comprising:
a converter for voltage converting output voltage from the dc power source for supply to the inverter; and
a control section for controlling supply current to the first motor through PWM control of the inverter,
the inverter comprising a U phase arm, a V phase arm and a W phase arm, each of the U phase arm, the V phase arm and the W phase arm including two transistors connected in series,
the converter comprising:
a reactor connected at one end to the de power source, and at least two switching elements, being an upper switching element connecting the other end of the reactor to a power source side of the inverter and a lower switching element connecting to an earth side of the inverter, wherein
the control section calculates an inverter input voltage target value appropriate to efficient motor drive in response to rotational speed of the first motor and a target output torque, and performs PWM control of the converter switching elements in order to achieve the input voltage target value,
wherein the converter has a full bridge configuration with both ends of a battery and one end of a reactor being connected through two switching elements,
wherein a separate inverter for supplying current to a second motor is connected to the output of the converter, and the control section outputs a higher voltage of two inverter input target voltages calculated from rotational speeds and target outputs of the first and second motors.
13. The motor drive controller of claim 1 , wherein, when the calculated inverter input target voltage exceeds a specified upper limit value, the control section sets the input target voltage to the upper limit value.
14. The motor drive controller of claim 3 , wherein, when the calculated inverter input target voltage exceeds a specified upper limit value, the control section sets the input target voltage to the upper limit value.
15. The motor drive controller of claim 4 , wherein, when the calculated inverter input target voltage exceeds a specified upper limit value, the control section sets the input target voltage to the upper limit value.
16. A motor drive controller, for supplying output of a dc power source to a first motor through an inverter and controlling drive of the first motor, comprising:
a converter for voltage converting output voltage from the dc power source for supply to the inverter; and
a control section for controlling supply current to the first motor through PWM control of the inverter,
the converter comprising:
a reactor connected at one end to the dc power source, and at least two switching elements, being an upper switching element connecting the other end of the reactor to a power source side of the inverter and a lower switching element connecting to an earth side of the inverter, wherein
the control section calculates an inverter input voltage target value appropriate to efficient motor drive in response to rotational speed of the first motor and a target output torque, and performs PWM control of the converter switching elements in order to achieve the input voltage target value,
wherein a separate inverter for supplying current to a second motor is connected to the output of the converter, and the control section outputs a higher voltage of two inverter input target voltages calculated from rotational speeds and target outputs of the first and second motors.
17. The motor drive controller of claim 16 , wherein, when the calculated inverter input target voltage exceeds a specified upper limit value, the control section sets the input target voltage to the upper limit value.