摘要:
A motor driving system according to the present invention comprises a power converter for supplying a brushless motor having a permanent magnetic rotor with pulse-width modulation controlled driving power; a magnetic-pole position detector for detecting a magnetic-pole position of the motor rotor; a speed detecting means for detecting a rotational speed of the motor according to an output signal of the magnetic-pole position detector; a speed control operation means for outputting a deviation of an output signal of the speed detecting means from a speed instruction; a means for generating a plurality of instruction signals in response to an output signal of the speed control operation means; a means for generating modulated waves by selecting one of the plurality of instruction signals according to the output signal of the speed control operation means; and a means for controlling the power converter by means of pulse width modulation according to the modulated waves.
摘要:
A motor driving system according to the present invention comprises a power converter for supplying a brushless motor having a permanent magnetic rotor with pulse-width modulation controlled driving power; a magnetic-pole position detector for detecting a magnetic-pole position of the motor rotor; a speed detecting means for detecting a rotational speed of the motor according to an output signal of the magnetic-pole position detector; a speed control operation means for outputting a deviation of an output signal of the speed detecting means from a speed instruction; a means for generating a plurality of instruction signals in response to an output signal of the speed control operation means; a means for generating modulated waves by selecting one of the plurality of instruction signals according to the output signal of the speed control operation means; and a means for controlling the power converter by means of pulse width modulation according to the modulated waves.
摘要:
In order to supply an AC motor control apparatus which identifies the type of motor automatically , the AC motor control apparatus has a motor type identification means by which the type of motor connected to the motor control apparatus is identified by issuing the appropriate voltage command for motor type identification and judging from the detected current whether the motor rotor is equipped with a magnet and has magnetic salience. The AC motor control apparatus has a control scheme selection means which selects the appropriate control scheme according to the above-identified type of motor and controls the driving of the motor.
摘要:
Providing control apparatus with a maximum torque/current ratio control means by which the relationship between the maximum torque and current amplitudes and the relationship between the maximum torque and current phases are converted to numeric expressions including one or more than one linear function with the torque taken as the parameter, then the current amplitude command and current phase command data that yields a maximum torque is computed, and computed data is sent as an output signal.
摘要:
A phase signal generation circuit (9) is constituted by using a comparison circuit (10), a delay circuit (11), a gate signal preparation circuit (13), and a selection holding circuit (12). A phase signal (9a) generated in the phase signal generation circuit (9) is pattern recognized in a control circuit (6) and a position of a rotor is detected and further PWM control whole area, PAM control, and a change-over PWM/PAM is carried out. A rotor position detection accuracy can be heightened and the wide control range can be obtained.
摘要:
A phase signal generation circuit (9) is constituted by using a comparison circuit (10), a delay circuit (11), a gate signal preparation circuit (13), and a selection holding circuit (12). A phase signal (9a) generated in the phase signal generation circuit (9) is pattern recognized in a control circuit (6) and a position of a rotor is detected and further PWM control whole area, PAM control, and a change-over PWM/PAM is carried out. A rotor position detection accuracy can be heightened and the wide control range can be obtained.
摘要:
A motor drive apparatus and an air-conditioner using the motor control apparatus of the invention has a feature to be able to gradually increase the dc voltage value (Ed) to a predetermined value when starting the switching operation of a chopper circuit by means of the dc voltage control means thereof, and when stopping the switching operation of the chopper circuit to be able to gradually decrease the dc voltage value (Ed) to a predetermined value. Further, the dc voltage command value (Ed*) is adjusted so as to be able to maintain a preferred value of dc voltage. Thereby, fluctuation in the number of revolutions of the motor (N) can be prevented even if the converter is started or stopped while the motor is operating, thereby allowing the motor drive apparatus and air-conditioner using the motor control apparatus of the invention to be operated at their maximum capacities.
摘要:
For achieving an air conditioner being applicable to various a-c source voltages in common and operative with high power factor by suppressing generation of high harmonics, an a-c source voltage from an a-c electric power source 1 is rectified in full-wave by a rectifier 2, and a d-c source voltage Ed of an inverter 13 is obtained by being charged in a condenser 5. Here, there are a-c source voltages of 100 V and 200 V, and a divided voltage Ed1 of the d-c voltage of the condenser 5 is selected when the a-c source voltage is 100 V, a divided voltage Ed2 (here, Ed1 > Ed1) of the d-c voltage of the condenser 5 is selected when the a-c source voltage is 200 V, respectively by an exchange switch 18, and is used as a d-c voltage Ed' for controlling on and off of a switch element 6. Though the d-c source voltage Ed differs depending on the a-c source voltage of 100 V or 200 V, it is possible to set the d-c source voltage Ed at a voltage value for operating the inverter 13 with low loss and high efficiency, for each one of the a-c source voltages, by setting a ratio of the voltage division appropriately.