Electricity: motor control systems – Closed loop speed control system for dc motor with commutator – Armature control by digital or combined analog and digital...
Patent
1995-03-02
1996-07-02
Ro, Bentsu
Electricity: motor control systems
Closed loop speed control system for dc motor with commutator
Armature control by digital or combined analog and digital...
388904, 388906, 3889075, 388930, 318599, 318602, 318609, 318432, H02P 517
Patent
active
055331661
ABSTRACT:
A method for calculating a speed estimated value in a speed control system, comprises the steps of: (a) storing the number of speed detection pulses obtained at each interval of a speed control process and time that the speed detection pulse was obtained; (b) calculating a detection speed from the number of latest speed detection pulses and its detection time, and the number of the previously stored speed detection pulses and its detection time; (c) executing an averaging process of motor model output corresponding to time that the detection speed was obtained; (d) obtaining a difference between an output obtained at said step (c) and the detection speed; (e) executing a calculation of a load torque estimation by multiplying the difference of the step (d) by an observer gain; (f) executing an estimation of a motor speed for next processing from the difference of the step (d) and a difference between the detection speed and the motor model output; (g) calculating an output of a speed amplifier by constituting the speed amplifier by a proportion element and from a speed estimated value obtained in the step (f); (h) obtaining a torque command by summing the speed amplifier and the load torque estimated value; and (i) outputting the torque command of the step (h) at a start point of the next speed control interval. Therefore, an output time of the torque command becomes clear, and the estimated value of the motor speed at a correct time can be obtained.
REFERENCES:
patent: 5325460 (1994-06-01), Yamada et al.
patent: 5334923 (1994-08-01), Lorenz et al.
patent: 5476158 (1995-12-01), Mann et al.
Yamamoto Yasuhiro
Yoshida Yasuhiro
Kabushiki Kaisha Meidensha
Ro Bentsu
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