Title:
METHOD AND APPARATUS FOR BRAKING SYNCHRONOUS MOTOR
Document Type and Number:
Japanese Patent JP3117905
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To obtain a low cost dynamic brake by connecting a nonlinear control resistor with the input connector for a synchronous motor and closing the stator winding thereof via the resistor.
SOLUTION: In a frequency converter, where the rectified output from a power supply bridge 4 is connected with a motor bridge 5 via intermediate circuits 22, 24, the intermediate circuits 22, 24 are connected with a brake resistor 58 and a nonlinear brake resistor 60 in series with a brake transistor 62. Upon the occurrence of power interruption or an overspeed state, where an emergency governor is operated, a contact 64 is closed thus closing the stator winding circuit of a synchronous motor 2 via input connectors 38, 40, 42, diodes 52-57 in the motor bridge 5 and the nonlinear brake resistor 60. With such a constitution, dynamic braking of the synchronous motor 2 can be attained at low cost.
Inventors:
Harikara
Esco Aulanco
Yoruma Mustarauch
Esco Aulanco
Yoruma Mustarauch
Application Number:
JP27620095A
Publication Date:
December 18, 2000
Filing Date:
October 02, 1995
Export Citation:
Assignee:
KONE CORPORATION
International Classes:
H02P3/22; B66B1/32; H02P3/06; H02P6/24; (IPC1-7): H02P3/22
Domestic Patent References:
| JP6077689A | ||||
| JP799784A | ||||
| JP1120797U |
Attorney, Agent or Firm:
Takao Katori
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