JP2008220155A5

JP2008220155A5 -

Info

Publication number: JP2008220155A5
Application number: JP2007320773A
Authority: JP
Filing date: 2007-12-12
Publication date: 2010-11-18
Anticipated expiration: 2027-12-12

Claims

A motor control device for driving a motor,
Control means for obtaining a level of a command voltage used for driving the motor;
Motor driving means for driving the motor using a voltage at a level determined by the control means;
Current detecting means for detecting a current flowing through the motor;
The current based on the current value detected by the detection means, e Bei and parameter calculation means for calculating the parameter to be used when determining the level of the command voltage,
The control means includes an open loop control means for obtaining a level of the command voltage according to a motor circuit equation based on a command current value indicating an amount of current to be supplied to the motor and an angular velocity of the rotor of the motor,
The motor control device according to claim 1, wherein the parameter calculation means obtains a parameter included in a circuit equation of the motor based on the current value detected by the current detection means .

2. The motor control according to claim 1, wherein the parameter calculation unit obtains the number of armature winding interlinkage magnetic fluxes included in a motor circuit equation based on the current value detected by the current detection unit. apparatus.

2. The motor according to claim 1, wherein the parameter calculation unit obtains a circuit resistance including an armature winding resistance included in a circuit equation of the motor based on a current value detected by the current detection unit. Control device.

The control means includes
Feedback control means for performing a proportional-integral operation on the difference between the command current value and the current value detected by the current detection means to determine the level of the command voltage;
And further comprising a level of the command voltage determined by the feedback control means, and a command voltage selection section for outputting by switching the level of the command voltage determined by the open loop control means, according to claim 1 Motor control device.

The command voltage selection means outputs the level of the command voltage obtained by the feedback control means when the current detection means is operating normally, and the open loop control means when the current detection means fails. Output the command voltage level
The motor control device according to claim 4 , wherein the parameter calculation unit obtains a parameter included in a circuit equation of the motor while the current detection unit is operating normally.

The parameter calculation means is included in the motor circuit equation when the influence of the change in the circuit resistance including the armature winding resistance included in the motor circuit equation can be ignored based on the current value detected by the current detection means. A circuit resistance including the armature winding resistance is obtained when an influence of a change in the number of armature winding linkage magnetic fluxes can be ignored. the motor control device according to 1.

The parameter calculation means obtains a d-axis current detection value in a dq coordinate system based on the current value detected by the current detection means, and the d-axis when the obtained d-axis current detection value is not zero. The motor control device according to claim 3 , wherein a circuit resistance including the armature winding resistance is obtained based on a current detection value.

The control means includes command current value calculation means for obtaining a command current value indicating the amount of current to be supplied to the motor,
The parameter calculation means obtains a heat generation amount based on the command current value obtained by the command current value calculation means when a current value is not detected by the current detection means, and based on the obtained heat generation amount, a circuit of the motor The motor control device according to claim 1, wherein a circuit resistance including an armature winding resistance included in the equation is obtained.

The control means includes
Dimensional conversion means for calculating a current torque constant by dimensional conversion of the number of armature winding linkage magnetic fluxes obtained by the parameter calculation means;
A command current value indicating the amount of current to be supplied to the motor corresponding to a value obtained by receiving the current torque constant from the dimension conversion means and dividing a target torque value to be generated in the motor by the current torque constant The motor control device according to claim 2 , further comprising command current value calculation means for obtaining

Voltage detecting means for detecting a voltage corresponding to the voltage applied to the motor,
The motor driving means is
A switching circuit having a plurality of switching elements, and supplying a current to the motor by turning on and off the plurality of switching elements;
Motor voltage determining means for turning on and off the plurality of switching elements using a voltage at a level obtained by the control means and a voltage detected by the voltage detecting means,
The voltage detecting means is connected to one point on the path from one end of the switching circuit connected to the positive side of the power source for driving the motor to the positive side of the power source, and the negative side of the power source. The motor control device according to claim 1, wherein a voltage between the other end of the switching circuit and another point on a path from the negative side of the power source is measured.

The motor drive means includes a plurality of switching elements, and includes a switching circuit that supplies current to the motor.
It said current detecting means, characterized in that it is provided only one between the switching circuit and the power supply, motor control device according to any one of claims 1-10.

An electric power steering device comprising the motor control device according to any one of claims 1 to 11 .