US 9,287,808 B2Granted

Motor controller and construction machine provided therewith

AssigneesSinfonia Technology Co., Ltd., Kobelco Construction Machinery Co., Ltd.

InventorsTakeo Ito, Hideaki Moriya, Takeshi Tomizaki, Akira Nakazumi, Yusuke Kamimura

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Abstract

There is obtained a configuration capable of rapidly decelerating a motor even if a failure occurs in the communication between a controller and a motor control unit in a motor controller in which a speed command is input from the controller to the motor control unit. A motor controller 1 is provided with a main controller 2, and a motor control unit 3 configured to be communicable with the main controller 2 to drive a motor M according to a torque command output from the main controller 2. The motor control unit 3 includes a speed control unit 31 for outputting a torque command, so as to decelerate the motor M, if any failure occurs in communication with the main controller 2 while the motor M is being driven.

Claims4

Dependent claims

A motor controller comprising:

a controller;
and
a motor control unit configured to be capable of communicating with the controller to drive a motor according to a drive command output from the controller, the motor control unit including a deceleration controller for outputting a drive command, so as to decelerate the motor, if any failure occurs in communication with the controller while the motor is being driven
a communication failure detector for detecting a failure in communication with the controller;
and
a command selector for selecting a drive command output from the controller as a drive command for the motor if any communication failure is not detected by the communication failure detector, or selecting a drive command output from the deceleration controller as a drive command for the motor if a communication failure is detected by the communication failure detector.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/289,957Filed 29 May 2014
Priority: JP 2013-11358130 May 2013
Published: US 2014/0354197 A14 Dec 2014
Granted: 15 Mar 2016
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

H02P 3/18
For stopping or slowing an individual dynamo-electric motor or dynamo-electric converter: for stopping or slowing an AC motor
H02P 21/36
Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation: arrangements for braking or…
H02P 29/024
Providing protection against overload without automatic interruption of supply: detecting a fault condition, e.g. short circuit, locked rotor,…
H02P 29/027
Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load: the fault being an over-current