Title:
DRIVE SYSTEM FOR SYNCHRONOUS MOTOR
Document Type and Number:
Japanese Patent JPS5941187
Kind Code:
A
Abstract:
PURPOSE:To prevent the irregular rotary torque of a synchronous motor by storing a strain compensating pattern of an induced voltage in a memory for outputting a sinusoidal pattern of the same phase as the induced voltage phase upon receiving of a rotating position detection output. CONSTITUTION:A sinusoidal wave sintheta, cosine wave costheta compensated for the distortion of the induced voltage and pulse train signals PP, NP are outputted from a sine wave generator 3 which receives a pulse detection signal from a pulse encoder 2. The actual speed voltage from an F/V converter 7 and the speed deviation from a speed command voltage VCMD are proportionally integrated in an error amplifier 9, the calculated result IS corresponding to the amplitude of an armature current is multiplied by multipliers 10a, 10b by costheta and sintheta, converted by 2/3 phase converter 11 to current commands Iu-Iw, inputted to pulse width modulation and inverters 14a-14c through the difference from the actual phase currents Iau-Iaw by arithmetic circuits 12a-12c and an amplifier by current amplifiers 13a-13c, thereby becoming pulse width modulation current commands iuc-iwc.
Inventors:
ISHIDA HIROSHI
Application Number:
JP15156282A
Publication Date:
March 07, 1984
Filing Date:
August 31, 1982
Export Citation:
Assignee:
FANUC LTD
International Classes:
H02P21/00; H02P6/06; H02P25/02; H02P27/04; (IPC1-7): H02P5/00
Attorney, Agent or Firm:
Minoru Tsuji