Title:
MOTOR CONTROLLER
Document Type and Number:
Japanese Patent JP3701442
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To prevent a motor from being tripped, when the motor is in acceleration/deceleration state and improve an operation efficiency.
SOLUTION: The heat storage capacity of a motor from a past state a certain time prior to a present state is continuously monitored with a heat storage capacity monitoring means. The amount of heat which is generated by the motor, when the motor is accelerated from the present operation velocity to a rated velocity or decelerated from the present operation velocity to a zero velocity, is estimated. When a Pw of the present heat capacity of the motor and the estimated heat capacity at the time of acceleration/deceleration exceeds a predetermined load reference value Pr, the motor is so controlled as to forcibly keep the present speed. With this constitution, overload tripping can be prevented, and the efficiency of a work using the motor as a prime mover can be improved as a whole.
Inventors:
Toshiomi Yazawa
Application Number:
JP24430997A
Publication Date:
September 28, 2005
Filing Date:
September 09, 1997
Export Citation:
Assignee:
Toshiba Mitsubishi Electric Industrial Systems Co., Ltd.
International Classes:
H02H7/085; H02P7/00; H02P29/00; H02P29/02; (IPC1-7): H02H7/085; H02P5/00; H02P7/00
Domestic Patent References:
| JP5227646A | ||||
| JP4071379A | ||||
| JP2087928A |
Attorney, Agent or Firm:
Hidekazu Miyoshi