Abstract: An electric motor such as a driving source of an electric vehicle is controlled by the microcomputer 7. The microcomputer 7 calculates a target torque Req_trq according to a throttle opening degree ?, and outputting induction values (a current instruction value I and a angle instruction value ?) obtained referring to a map MP based on the target torque Req_trq (a motor rotational number Nm and a battery voltage Vb), the microcomputer 7 performs a torque control of an SR motor 3. The motor rotational number Nm detected from the SR motor 3 is passed through a band pass filter 51. Passing by the band pass filter 51, a signal data of the extracted 0.1-50 Hz is executed a PD calculation process 52, the calculated corrected amount PD_out is subtracted from the target torque Req_trq.

Abstract: A control device of an electric motor which can compatible high robust stability performance and a tracking performance and a designing method thereof. A feedback correction is obtained based on a detected motor rotation speed and a feedforward correction amount is obtained based on a calculated target torque by a controller of a microcomputer. The microcomputer commands torque control to an SR motor based on the feedback correction amount and the feedforward correction amount.

Abstract: A controller K calculates a command torque by correcting the required torque w1 with a correction based on a motor rotation speed Nm, and controls an electric motor based on the command torque T. The command torque w1 is regarded as one content of an outside input W to the controller K. A difference between the rotation speed of the electric motor outputted by the actual model describing an actual response of the electric motor and another rotation speed of the electric motor outputted by a reference model describing ideal performance and vibration reduction is regarded as one content Z1 of controlled output Z from the controller K. Moreover, a characteristic variation depending on vehicle types and so on, a torque ripple, and a sensor noise are described by weight functions wm1, wm2 and wn. Then a pertubative output w2 and a sensor noise w3 are regarded as the remaining contents of the input W. An output of the weight function wm2 is regarded as the controlled output Z.

Abstract: A control device of an electric motor which can compatible high robust stability performance and a tracking performance and a designing method thereof. A feedback correction is obtained based on a detected motor rotation speed and a feedforward correction amount is obtained based on a calculated target torque by a controller of a microcomputer. The microcomputer commands torque control to an SR motor based on the feedback correction amount and the feedforward correction amount.

Abstract: A controller K calculates a command torque by correcting the required torque w1 with a correction based on a motor rotation speed Nm, and controls an electric motor based on the command torque T. The command torque w1 is regarded as one content of an outside input W to the controller K. A difference between the rotation speed of the electric motor outputted by the actual model describing an actual response of the electric motor and another rotation speed of the electric motor outputted by a reference model describing ideal performance and vibration reduction is regarded as one content Z1 of controlled output Z from the controller K. Moreover, a characteristic variation depending on vehicle types and so on, a torque ripple, and a sensor noise are described by weight functions wm1, wm2 and wn. Then a pertubative output w2 and a sensor noise w3 are regarded as the remaining contents of the input W. An output of the weight function wm2 is regarded as the controlled output Z.

Abstract: An electric motor such as a driving source of an electric vehicle is controlled by the microcomputer 7. The microcomputer 7 calculates a target torque Req_trq according to a throttle opening degree &agr;, and outputting induction values (a current instruction value I and a angle instruction value &thgr;) obtained referring to a map MP based on the target torque Req_trq (a motor rotational number Nm and a battery voltage Vb), the microcomputer 7 performs a torque control of an SR motor 3. The motor rotational number Nm detected from the SR motor 3 is passed through a band pass filter 51. Passing by the band pass filter 51, a signal data of the extracted 0.1-50 Hz is executed a PD calculation process 52, the calculated corrected amount PD_out is subtracted from the target torque Req_trq.

Abstract: A sewing machine includes a movable holder portion which holds a material to be sewn, a holder drive portion which transfers the holder portion during sewing, a needle drive portion which drives a sewing needle to sew, and a controller which intelligently regulates the holder drive portion and the needle drive portion. The controller includes a) an initial motion device which initially transfers the material to be sewn before sewing or during an initial stage of sewing, and b) an estimating device which finds the mass of the material to be sewn depending on a physical value such as at least one of a moving velocity of the material to be sewn at a predetermined period of time and a moving distance of the material within the amount of the predetermined period of time.

Abstract: A sewing machine includes a movable holder portion which holds a material to be sewn, a holder drive portion which transfers the holder portion during sewing, a needle drive portion which drives a sewing needle to sew, and a controller which intelligently regulates the holder drive portion and the needle drive portion. The controller includes a) a initial motion device which initially transfers the material to be sewn before sewing or during an initial stage of sewing, and b) an estimating device which finds the mass of the material to be sewn depending on a physical value such as at least one of a moving velocity of the material to be sewn at a predetermined period of time and a moving distance of the material within the amount of the predetermined period of time.

Abstract: The invention is directed to a stability control system for an automatic control system, which includes a controlled system, a measuring unit for measuring a response characteristic of the controlled system, and a computing unit for processing the response characteristic to obtain a standard frequency transfer function and a varied frequency transfer function with a permissive variation to the standard frequency transfer function. A band division unit is provided for dividing the standard frequency transfer function and the varied frequency transfer function into a plurality of bands, respectively. A modeling unit is provided for mathematically approximating the standard frequency transfer function for each band and the varied frequency transfer function for each band, to obtain a standard approximate model and a varied approximate model, respectively. A variation computing unit is provided for computing a variation of the varied approximate model to the standard approximate model for each band.