US 6,674,261 B2Granted

Motor control apparatus

AssigneeHonda Giken Kogyo Kabushiki Kaisha

InventorsYutaka Takahashi, Nobuyuki Imai

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Abstract

A sensorless detector 25 uses a rotor angle finally detected by a sensor interpolation detector 24 as an estimated value (θ{circumflex over ( )}) of the rotor angle of a motor 3 in a first control cycle upon changing from a rotor angle detecting process carried out by the sensor interpolation detector 24. In subsequent control cycles, the sensorless detector 25 uses estimated values (θ{circumflex over ( )}, ω{circumflex over ( )}) of the rotor angle and a rotor angular velocity in a preceding control cycle as calculation parameters, updates the calculation parameters with an observer which sequentially updates the calculation parameters depending on a phase difference (θ−θ{circumflex over ( )}) calculated in the preceding control cycle in order to eliminate the phase difference, for thereby calculating the estimated value (θ{circumflex over ( )}) of the rotor angle of the motor 3 in the present control cycle.

A motor control apparatus comprising:

a current sensor for detecting a current flowing through an armature of a motor having a salient-pole rotor;
a rotational speed sensor for detecting a rotational speed of said motor;
an angle sensor for outputting a pulse signal each time a rotor angle of the motor reaches a predetermined angle when the motor is rotated;
high-frequency voltage applying means for applying a high-frequency voltage to the armature of the motor;
rotor angle detecting means for carrying out a first rotor angle detecting process to apply the high-frequency voltage from said high-frequency voltage applying means to said armature and detect the rotor angle of said motor based on a change in the current detected by said current detector depending on the applied high-frequency voltage when the detected rotational speed of said motor is lower than a predetermined rotational speed, and carrying out a second rotor angle detecting process to detect the rotor angle of said motor based on the pulse signal outputted from said angle sensor when the detected rotational speed of said motor is equal to or higher than said predetermined rotational speed;
and
energization control means for controlling energization of said armature based on the rotor angle of said motor which is detected by said rotor angle detecting means;
said rotor angle detecting means comprising means for sampling the current detected by said current sensor in each given control cycle to detect the rotor angle of said motor in said first rotor angle detecting process, and, when said second rotor angle detecting process changes to said first rotor angle detecting process, detecting the rotor angle finally detected in said second rotor angle detecting process as the rotor angle in a first control cycle of said first rotor angle detecting process, and, in subsequent control cycles, detecting the rotor angle in a present control cycle using the rotor angle detected in a preceding control cycle as a calculation parameter.

5 more elements

Facts

Application

10/131,245Filed 25 Apr 2002

Priority

JP 2001-12898526 Apr 2001

Published

US 2003/0030406 A113 Feb 2003

Granted

6 Jan 2004

Term ends

Not estimatedThe source records don’t support an estimate.

Classification14 codes

B60L 15/025
Characterised by the form of the current used in the control circuit: using field orientation; Vector control; Direct Torque Control [DTC]
B60L 3/12
Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy…:…
B60L 2210/30
Converter types: aC to DC converters
B60L 2210/40
Converter types: dC to AC converters

Abstract

Claims7