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A detection device being capable of detecting a high-precision instantaneously generated torque and a high-precision average generated torque of a three-phase motor is provided. The detection device includes a calculator in which, before an instantaneously generated torque is calculated from the ins

A detection device being capable of detecting a high-precision instantaneously generated torque and a high-precision average generated torque of a three-phase motor is provided. The detection device includes a calculator in which, before an instantaneously generated torque is calculated from the instantaneous values of applied voltages and currents of the three-phase motor, a no-load current which is not contributed to the torque is detected in advance, and the instantaneous value of the no-load current is subtracted from an instantaneous current detected from the three-phase motor in a drive state, and a high-precision instantaneously generated torque is calculated, or includes a calculator in which an instantaneous no-load loss torque corresponding to the no-load current is calculated, the no-load loss torque is subtracted from the value of an instantaneously generated torque calculated from the instantaneous values of the applied voltage and the current detected from the three-phase motor in the drive state, and a high-precision instantaneously generated torque is calculated. Also, a no-load loss average torque with respect to time is calculated from the instantaneous no-load loss torque, and a high-precision average generated torque can be detected in consideration of the average loss torque in the no-load state.

대표청구항 ▼

A detection device being capable of detecting a high-precision instantaneously generated torque and a high-precision average generated torque of a three-phase motor is provided. The detection device includes a calculator in which, before an instantaneously generated torque is calculated from the ins

A detection device being capable of detecting a high-precision instantaneously generated torque and a high-precision average generated torque of a three-phase motor is provided. The detection device includes a calculator in which, before an instantaneously generated torque is calculated from the instantaneous values of applied voltages and currents of the three-phase motor, a no-load current which is not contributed to the torque is detected in advance, and the instantaneous value of the no-load current is subtracted from an instantaneous current detected from the three-phase motor in a drive state, and a high-precision instantaneously generated torque is calculated, or includes a calculator in which an instantaneous no-load loss torque corresponding to the no-load current is calculated, the no-load loss torque is subtracted from the value of an instantaneously generated torque calculated from the instantaneous values of the applied voltage and the current detected from the three-phase motor in the drive state, and a high-precision instantaneously generated torque is calculated. Also, a no-load loss average torque with respect to time is calculated from the instantaneous no-load loss torque, and a high-precision average generated torque can be detected in consideration of the average loss torque in the no-load state. 10300, Naito, 701/001; US-6219602, 20010400, Badenoch et al., 701/037; US-6370458, 20020400, Shai et al., 701/037