摘要:
Under a low load condition, a produced torque is small and a synthetic current command I* with respect to an armature of a servomotor is small so that a magnitude in a negative direction of a reactive current command Id* determined by Id*=−|I*|·sin θ is small. As a result, under the low load condition, the synthetic current flowing through the armature can be small, and generation of wasteful heat can be suppressed. Further, under a high load condition, because a q-axis current Iq that produces the torque is large, voltage saturation is liable to occur. However, at the same time, the overall current command I* is large under the high load condition, and Id* is large in the negative direction. Therefore, a large reactive current Id can be flowed in the negative direction, and voltage saturation under the high load condition can be effectively prevented.
摘要:
Under a low load condition, a produced torque is small and a synthetic current command I* with respect to an armature of a servomotor is small so that a magnitude in a negative direction of a reactive current command Id* determined by Id*=−|I*|·sin θ is small. As a result, under the low load condition, the synthetic current flowing through the armature can be small, and generation of wasteful heat can be suppressed. Further, under a high load condition, because a q-axis current Iq that produces the torque is large, voltage saturation is liable to occur. However, at the same time, the overall current command I* is large under the high load condition, and Id* is large in the negative direction. Therefore, a large reactive current Id can be flowed in the negative direction, and voltage saturation under the high load condition can be effectively prevented.
摘要:
A method of agitating a bath of melted metal for treating the same by blowing gas into a one piece columnar body of such melted metal disposed in the bath to cause the apparent specific gravity of the columnar body to be reduced and to thereby be hydrostatically lifted, and returning the lifted portion of the melted metal to the bath by pouring the same with a splashing effect onto the free surface of the bath, in a manner to continuously change the pouring position on the free surface of the bath, thereby causing improved agitation of the bath, and especially improved contact and mixing of the melted metal and a treating agent generally floating on the free surface of the bath.
摘要:
A driving velocity of a motor is detected by processing a position information signal output from a sensor in accordance with a driving position of a motor. The signal processing device includes a position information signal processor (410) that processes the position information signal and calculates driving velocity information of the motor, and an internal position information generator (460) that reflects a latest driving velocity information (ωn) calculated by the position information signal processor (410) and generates a latest presumed position of the motor as internal position information. An amplitude correcting unit (465) detects the amplitude of the position information signal from the sensor and corrects the amplitude of the internal position information signal based on the detected amplitude.
摘要:
A servo control device 10 connected to servo motors 21 to control them includes a digital logic circuit 11 having a predetermined bit width. The digital logic circuit 11 includes at least one pair of parallel arithmetical circuits 11a, 11b.
摘要:
A method of agitating a bath of melted metal for treating the same by blowing gas into a columnar body of such melted metal disposed in the bath to cause the apparent specific gravity of the columnar body to be reduced and to thereby be hydrostatically lifted, and returning the lifted portion of the melted metal to the bath by pouring the same with a splashing effect onto the free surface of the bath, in a manner to continuously change the pouring position on the free surface of the bath, thereby causing improved agitation of the bath, and especially improved contact and mixing of the melted metal and a treating agent generally floating on the free surface of the bath.
摘要:
A signal processing device processes a position information signal (A sinθ, A cosθ) output from a sensor in accordance with a driving position of a motor and detects a driving speed of the motor. The signal processing device includes a position information signal processor (410) that processes the position information signal and calculates driving speed information of the motor, and an internal position information generator (460) that reflects a latest driving speed information (ωn) calculated by the position information signal processor (410) and generates a latest presumed position of the motor as internal position information. The position information signal processor (410) calculates driving speed information (ωn) of the motor based on a difference between the position information signal (A sinθ, A cosθ) from the sensor and the internal position information (A sinθn, A cosθn) generated by the internal position information generator (460).
摘要:
Automatic speed loop gain adjustment of a feedback control system begins by setting up a phase margin range and a gain margin range. A speed open loop condition is provided by separating a speed command value from a speed feedback value. White noise is input into the feedback control system where the speed open loop condition has been made. A phase margin and a gain margin are then detected and comparisons are made with the phase margin range and the gain margin range, respectively. The speed loop gain is adjusted if the comparison results for either one of the detected phase margin and the detected gain margin fall outside of the associated phase margin range or gain margin range. Once the adjustment of the speed loop gain is complete, the position loop gain of the position control loop is adjusted on the basis of the adjusted speed loop gain.
摘要:
A method of controlling a current by supplying a d-axis current in order to prevent a voltage saturation includes: defining an amount of the d-axis current as Id=|Idmax|·sin θ; continuously comparing a voltage command value with the voltage command value threshold Vo in a predetermined cycle; extracting a predetermined number No of latest comparison results in terms of time; setting a phase angle θ to be 0° when a number N of the comparison results out of the predetermined number No of the comparison results is equal to or less than an integer Nb; and increasing the phase angle θ depending on largeness of the number N when the number N is more than the integer Nb.
摘要:
A signal processing device processes a position information signal (A sin θ, A cos θ) output from a sensor in accordance with a driving position of a motor and detects a driving speed of the motor. The signal processing device includes a position information signal processor (410) that processes the position information signal and calculates driving speed information of the motor, and an internal position information generator (460) that reflects a latest driving speed information (ωn) calculated by the position information signal processor (410) and generates a latest presumed position of the motor as internal position information. The position information signal processor (410) calculates driving speed information (ωn) of the motor based on a difference between the position information signal (A sin θ, A cos θ) from the sensor and the internal position information (A sin θn, A cos θn) generated by the internal position information generator (460).