US 2004/0104704 A1Published application

Motor control apparatus

AssigneeSanden Corporation

InventorDaisuke Hirono

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Abstract

A motor control apparatus includes a phase current detecting section for detecting phase currents to a motor, a current phase/current peak value calculating section for calculating a current phase based on the phase currents, a voltage phase setting section for adding a predetermined phase difference to the current phase and setting the resultant sum as a voltage phase, a phase voltage setting section for setting phase voltages to the motor based on the voltage phase and the command voltage. Basically, the motor is operated by maintaining the voltage at constant and always monitoring the current/voltage phases so as to maintain a constant phase difference, without the motor axis position being predicted.

Claims6

Dependent claims

A motor control apparatus for driving, by means of a power converter such as inverter, a synchronous motor such as brushless motor not provided with a sensor for detecting a motor axis position, comprising:

phase current detecting means for detecting phase currents to the synchronous motor;
current phase calculating means for calculating a current phase based on the phase currents detected by said phase current detecting means;
voltage phase setting means for setting a voltage phase that is determined by adding a predetermined phase difference to the current phase calculated by said current phase calculating means;
command voltage determining means for determining a command voltage based on a rotational speed command;
and
phase voltage setting means for setting phase voltages to the synchronous motor based on the voltage phase set by said voltage phase setting means and the command voltage determined by said command voltage determining means.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/716,591Filed 20 Nov 2003
Priority: JP 2002-3515013 Dec 2002
Published: 3 Jun 2004
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

H02P 6/00
Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation
H02P 6/08
Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position;…:…
H02P 21/26
Vector control not involving the use of rotor position or rotor speed sensors: rotor flux based control
H02P
Control or regulation of electric motors, electric generators or dynamo-electric converters

Family

US 6,900,613 B2Related patent
US 2004/0104704 A1This patent

From the US filing history. Foreign family members aren’t listed.

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