Title:
VECTOR CONTROLLER OF INDUCTION MOTOR
Document Type and Number:
Japanese Patent JPS60234485
Kind Code:
A
Abstract:
PURPOSE:To reduce the switching loss of a switching element by varying the reference frequency for pulse width modulation in response to the speed and the torque, thereby preventing a noise from generating at a high rotating speed and a high torque. CONSTITUTION:Overspeed signal detecting means 13 for detecting a rising signal corresponding to the rise when the absolute value of a speed signal B rises over the predetermined value, excess torque detecting means 14 for detecting a rising signal in response to the rise when the absolute value of a speed deviation signal C rises over the predetermined value, and pulse width modulating reference frequency correcting means 15 for correcting the larger output of the both detecting means by adding to a signal for specifying the reference frequency for the pulse width modulation are provided to perform a chopping operation.
Inventors:
HACHISUGA YOSHIAKI
Application Number:
JP8610684A
Publication Date:
November 21, 1985
Filing Date:
May 01, 1984
Export Citation:
Assignee:
FANUC LTD
International Classes:
H02P27/04; H02P21/00; H02P21/05; H02P21/14; H02P21/22; H02P23/04; H02P23/07; H02P23/08; H02P23/16; H02P27/08; (IPC1-7): H02P5/41
Attorney, Agent or Firm:
Seiichi Samukawa
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