摘要:
In a drive system of an AC motor in which a motor current is feedback-controlled, a motor current command is produced in a normal operation according to a torque command value on an optimum efficiency characteristic line so as to select an optimum current phase maximizing an output torque with a constant motor current amplitude. Conversely, when the AC motor produces an excessively generated power exceeding a regeneratable power quantity of the AC motor, a consuming operation is performed for intentionally increasing the power loss in the AC motor. In the consuming operation, the motor current command is produced according to the torque command value on a loss increase characteristic line to change the current phase from the above optimum value. Thereby, the power loss in the AC motor can be increased to consume the surplus power without causing instability in the motor control.
摘要:
In a drive system of an AC motor in which a motor current is feedback-controlled, a motor current command is produced in a normal operation according to a torque command value on an optimum efficiency characteristic line so as to select an optimum current phase maximizing an output torque with a constant motor current amplitude. Conversely, when the AC motor produces an excessively generated power exceeding a regeneratable power quantity of the AC motor, a consuming operation is performed for intentionally increasing the power loss in the AC motor. In the consuming operation, the motor current command is produced according to the torque command value on a loss increase characteristic line to change the current phase from the above optimum value. Thereby, the power loss in the AC motor can be increased to consume the surplus power without causing instability in the motor control.
摘要:
An AC motor drive control device includes a control mode judgment unit that performs a judgment based on required voltage amplitude required by a synchronous AC motor, in order to switch units for applying voltage to the AC motor to one of a rectangular wave voltage phase control unit, an overmodulation control unit, and a PWM current control unit.
摘要:
A carrier frequency setting unit (64) sets a carrier frequency (FC) according to the torque command (TR) of a motor generator and the number of motor rotations (MRN). A PWM signal generation unit (68) generates phase modulation waves corresponding to respective phase voltage commands (Vu, Vv, Vw) and generates phase PWM signals (Pu, Pv, Pw) according to the magnitude relationship between each of the phase modulation waves and a carrier wave having the carrier frequency (FC). A PWM center control unit (66), when the carrier frequency (FC) is lower than a predetermined frequency, generates a PWM center correction value (ΔCE) for variably controlling a PWM center and outputs to the PWM signal generation unit (68).
摘要:
In one coordinate system of arbitrary rectangular coordinate systems including a coordinate system in which the position of a stator is fixed, a coordinate system in which the position of a rotor is fixed, and a coordinate system which rotates at a rotational frequency which is n times (n is an integer which is not 0 or 1) that of the rotor, a filter on any other coordinate system is defined. Further, driving of a motor is controlled by utilizing this filter. As a result, a coordinate transformation operation need not be individually performed with respect to control variables.
摘要:
In one coordinate system of arbitrary rectangular coordinate systems including a coordinate system in which the position of a stator is fixed, a coordinate system in which the position of a rotor is fixed, and a coordinate system which rotates at a rotational frequency which is n times (n is an integer which is not 0 or 1) that of the rotor, a filter on any other coordinate system is defined. Further, driving of a motor is controlled by utilizing this filter. As a result, a coordinate transformation operation need not be individually performed with respect to control variables.
摘要:
A carrier frequency setting unit sets a carrier frequency based on a torque command and a motor rotation number of a motor generator. A PWM signal producing unit produces phase modulated waves corresponding to respective phase voltage commands, and produces respective phase PWM signals corresponding to a relationship in magnitude between the respective phase modulated waves and a carrier having the carrier frequency. A PWM center control unit produces a PWM center correction value for variably controlling the PWM center when the carrier frequency is lower than a predetermined frequency, and provides the same to the PWM signal producing unit.
摘要:
An AC motor drive control device includes a control mode judgment unit that performs a judgment based on required voltage amplitude required by a synchronous AC motor, in order to switch units for applying voltage to the AC motor to one of a rectangular wave voltage phase control unit, an overmodulation control unit, and a PWM current control unit.
摘要:
In response to a starting instruction of an engine 22 at a gearshift position of a gearshift lever 81 set to a parking position, the engine 22 and motors MG1 and MG2 are controlled to motor and start the engine 22 with output of a torque from the motor MG2 to keep a rotational position of a rotor in the motor MG2 at a preset reference position. This arrangement enables the engine 22 to be motored and started even in the state of separation of a ring gear shaft 32a from a driveshaft 36 by means of a transmission 60 and locking of drive wheels 39a and 39b by means of a parking lock mechanism 90.
摘要:
In response to a starting instruction of an engine 22 at a gearshift position of a gearshift lever 81 set to a parking position, the engine 22 and motors MG1 and MG2 are controlled to motor and start the engine 22 with output of a torque from the motor MG2 to keep a rotational position of a rotor in the motor MG2 at a preset reference position. This arrangement enables the engine 22 to be motored and started even in the state of separation of a ring gear shaft 32a from a driveshaft 36 by means of a transmission 60 and locking of drive wheels 39a and 39b by means of a parking lock mechanism 90.