Title:
BREAKING DEVICE FOR MOTOR
Document Type and Number:
Japanese Patent JPH01133583
Kind Code:
A
Abstract:
PURPOSE:To brake in a short period of time with high-speed response, by a method wherein an electrostatic induction type transistor is employed as the short-circuiting means of a short-circuit circuit. CONSTITUTION:A DC servomotor is constituted of a rectifier 21, a capacitor 22, an inverter 23, a control circuit 24 and the like principally. The rectifier 21 is constituted of a rectifying circuit employing a semiconductor rectifying element while the capacitor 22 smoothes the circuit and absorbs a regenerative power and an ineffective power from a synchronous motor 25. In this case, a power supplying circuit 26 for the synchronous motor 26 is provided with a short-eircuit circuit 27 for stopping the synchronous motor 25 forclbly by dynamic braking upon the emergency stop or the like of the same. The short- circuit circuit 27 is provided with a rectifying circuit 29, provided in parallel to the synchronous motor 25, and the rectifying output circuit 30 of the rectifying circuit 29 is provided with an electrostatic induction type transistor 34 and a current limiting resistor 32. According to this constitution, the control circuit 24 sets a switching element 40 in a closed condition, makes the gate circuit of said transistor 34 negative voltage and non-conductive and opens the short-circuit circuit 27.
Inventors:
SAWAI KENJI
Application Number:
JP28907487A
Publication Date:
May 25, 1989
Filing Date:
November 16, 1987
Export Citation:
Assignee:
OMRON TATEISI ELECTRONICS CO
International Classes:
H02P3/22; (IPC1-7): H02P3/22
Attorney, Agent or Firm:
Suzuki Yoshimitsu