CONTROL EQUIPMENT OF INDUCTION MOTOR - Mitsubishi Electric Corporation

Title:

CONTROL EQUIPMENT OF INDUCTION MOTOR

Document Type and Number:

Japanese Patent JP3266790

Kind Code:

B2

Abstract:

PROBLEM TO BE SOLVED: To attain maximum efficiency operation, when an induction motor whose iron loss can not be neglected is driven, and when motor constants are changed by the temperature variation in the course of operation.
SOLUTION: Operation results of a specific function defining constants of an induction motor which contain constants relative to iron loss as coefficient values are stored. By inputting variables relative to the specific function, the amplitude ratio of a torque current command and an exciting current command is outputted. By a current component command operating means 3a, from the torque command of the induction motor and the above ratio, an exciting current command is outputted as a (d) axis component command of a primary current on the rectangular rotation coordinate axes (called as d-q axes) which rotate at a primary frequency. A torque current command of the induction motor is outputted as the (q) axis component command of the primary current. From the outputs, the slip frequency of the induction motor is operated, and added to the primary current, thereby obtaining the primary frequency. The primary current command in which the value of product of the outputs of the operating means 3a is proportional to the torque command, and the amplitude ratio becomes equal to the above specific function value is outputted.

More Like This:

JP3625901	Servo control system automatic optimization method and equipment
JPS593736	[Title of the device] An electric motor protective device of a handling work machine
WO/1996/009675	AUTOMATIC FAULT CURRENT PROTECTION FOR A LOCOMOTIVE PROPULSION SYSTEM

Inventors:

Masaru Kobayashi
Seiji Anzai
Masato Koyama

Application Number:

JP7047296A

Publication Date:

March 18, 2002

Filing Date:

March 26, 1996

Export Citation:

Click for automatic bibliography generation Help

Assignee:

Mitsubishi Electric Corporation

International Classes:

H02H7/08; H02P21/00; H02P21/13; H02P21/22; H02P23/07; H02P27/04; H02P27/06; H02P27/08; (IPC1-7): H02P21/00; H02H7/08; H02P5/41

Domestic Patent References:

JP6284772A
JP6481679A
JP9233898A

Attorney, Agent or Firm:

Soga Doteru (6 people outside)

Previous Patent: METHOD FOR LEADING AIR VENT PIPE AND SOUNDING PIPE

Next Patent: EARTH RETAINING WALL