JP2002171797A - Control device for permanent magnet synchronous motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically measure, set, and store a value of a flux vector of a permanent magnet. SOLUTION: There is provided a flux measurement means comprising a flux measuring current controller, a flux measuring flux vector calculator, a flux calculator, and a flux memory device. When it is necessary to up-to-date a value of a flux vector stored in the flux memory device, the flux measurement means is made to operate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control of a permanent magnet synchronous motor having a function of automatically measuring and setting an electric constant of the permanent magnet synchronous motor in an inverter device for driving the permanent magnet synchronous motor. It concerns the device.

[0002]

2. Description of the Related Art Conventionally, the magnitude of a magnetic flux vector of a permanent magnet of a permanent magnet type synchronous motor is measured by rotating a permanent magnet type synchronous motor by another motor and measuring a primary voltage of the permanent magnet type synchronous motor by a voltmeter. The rotation speed was measured by a speed detector, and was determined from the primary voltage and the rotation speed.

[0003]

Generally, in order to control a permanent magnet type synchronous motor with high performance, an accurate electric constant of the permanent magnet type synchronous motor is required. However, in order to obtain the magnitude of the magnetic flux vector of the permanent magnet, which is one of the electrical constants of such a permanent magnet type synchronous motor, a great deal of labor, time and various measuring devices are required as in the conventional method. It becomes. The present invention has been made in view of the above points, and aims to solve these problems.
An object of the present invention is to provide a permanent magnet type synchronous motor control device provided with a function of automatically measuring and setting the magnitude of a magnetic flux vector of a permanent magnet in the permanent magnet type synchronous motor control device.

[0004]

Means for achieving the object include a power converter for supplying electric power to a permanent magnet type synchronous motor and a magnitude of a magnetic flux vector of a permanent magnet of the permanent magnet type synchronous motor. A permanent magnet type synchronous motor control device comprising a control device for controlling the output voltage of the power converter by using an AC current having a predetermined magnitude flowing through the permanent magnet type synchronous motor. A magnetic flux measuring current controller having an acceleration mode for rotating the motor to a predetermined number of revolutions and a measuring mode for setting the primary current of the permanent magnet type synchronous motor to 0 or a small value; and a magnetic flux measuring current controller. In the measurement mode, the primary voltage vector of the detected or estimated permanent magnet type synchronous motor is time-integrated to calculate the magnetic flux vector. And a magnetic flux calculator for obtaining the magnitude of the magnetic flux vector from the output of the magnetic flux vector calculator for magnetic flux measurement, and a magnetic flux storage unit for storing the output of the magnetic flux calculator, A control device for a permanent magnet type synchronous motor characterized by operating the magnetic flux measuring means when it is necessary to update the magnitude of a magnetic flux vector stored in a magnetic flux storage device. Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of the present invention. The power converter 3 supplies power to the permanent magnet type synchronous motor 1 by performing pulse width modulation on the DC power supply voltage according to the switching signal. The voltage detector 2 detects a primary voltage vector of the permanent magnet synchronous motor 1. During normal operation, the switch 4 selects the output of the normal operation control device 5.

For example, when performing torque control in normal operation, the normal operation control device 5 inputs the magnitude of the magnetic flux vector of the permanent magnet output from the magnetic flux storage unit 7 in the magnetic flux measuring means 10, and inputs the permanent magnet type synchronous motor. A current command flowing through the permanent magnet type synchronous motor 1 is calculated from the magnitude of the magnetic flux vector of the permanent magnet and the torque command so that the output torque of the motor 1 follows the torque command. The power converter 3 outputs a switching signal to the power converter 3 such that the power converter 3 outputs a voltage to the permanent magnet type synchronous motor 1 according to the voltage command.

In FIG. 1, when measuring the magnetic flux vector of the permanent magnet, the switch 4 is composed of a magnetic flux measuring current controller 6, a magnetic flux memory 7, a magnetic flux measuring magnetic flux vector calculator 8, and a magnetic flux calculator 9. The output of the magnetic flux measuring current controller 6 in the magnetic flux measuring means 10 is selected, and the primary voltage vector is output from the voltage detector 2 to the magnetic flux measuring magnetic flux vector calculator 8.
To the power converter 3 from the current controller 6 for magnetic flux measurement.
Inputs a switching signal for controlling a voltage to be output to the permanent magnet type synchronous motor 1 to the power converter 3,
The magnitude of the magnetic flux vector of the permanent magnet is input to the normal operation control device 5 from.

The magnetic flux measuring current controller 6 applies an alternating current of a predetermined magnitude to the permanent magnet type synchronous motor 1 to rotate the permanent magnet type synchronous motor 1 to a predetermined number of revolutions.
The power converter 3 controls the permanent magnet type synchronous motor 1 so that the primary current of the permanent magnet type synchronous motor 1 becomes zero or a very small value.
And outputs a switching signal for controlling the voltage to be output.

A magnetic flux measuring magnetic flux vector calculator 8 inputs a primary voltage vector v and outputs a magnetic flux vector of the permanent magnet in a state where the primary current of the permanent magnet type synchronous motor 1 is 0 or a small value. . When the primary current of the permanent magnet type synchronous motor 1 is set to 0 or a very small value, the voltage drop due to the primary winding resistance and inductance of the permanent magnet type synchronous motor 1 becomes 0 or a very small value. Therefore, the magnetic flux vector of the permanent magnet can be calculated by time-integrating the primary voltage vector v.

The magnetic flux calculator 9 is a permanent magnet type synchronous motor 1
Rotates and the primary current is 0 or a small value, and the magnetic flux vector of the permanent magnet is input to output the magnitude of the magnetic flux vector of the permanent magnet. When the permanent magnet type synchronous motor 1 rotates and the primary current is 0 or a small value, the magnetic flux vector of the permanent magnet output from the magnetic flux vector calculator for magnetic flux measurement draws a circular locus. From the length, the magnitude of the magnetic flux vector of the permanent magnet can be obtained. The magnetic flux storage unit 7 inputs and stores the magnitude of the magnetic flux vector of the permanent magnet measured by the magnetic flux calculator 9, and outputs the magnitude of the magnetic flux vector to the normal operation control device 5.

Another embodiment of the present invention will be described with reference to FIG. The components having the same reference numerals as those in FIG. 1 have the same configuration and function, and therefore description thereof is omitted. In FIG. 2, a voltage estimator 2 ′ estimates a primary voltage vector of the permanent magnet type synchronous motor 1 from a switching signal output from the magnetic flux measuring current controller 6 and a DC power supply voltage of the power converter 3, and detects a voltage. The estimated primary voltage vector output from the detector 2 is output to the magnetic flux measurement magnetic flux vector calculator 8 instead of the detected primary voltage vector.

[0012]

According to the present invention, the setting of the magnitude of the magnetic flux vector of the permanent magnet required for controlling the permanent magnet type synchronous motor with high performance can be performed by the operator using the control device of the permanent magnet type synchronous motor. Since the operation is automatically performed simply by switching to the automatic measurement operation, a great deal of labor, time and various measuring devices for setting the electric constants in the related art are not required, which is very useful in practice.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating an embodiment of the present invention.

FIG. 2 is a block diagram showing another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Permanent magnet synchronous motor 2 Voltage detector 2 'Voltage estimator 3 Power converter 4 Switch 5 Normal operation control device 6 Current controller for magnetic flux measurement 7 Magnetic flux memory 8 Magnetic flux vector calculator for magnetic flux measurement 9 Magnetic flux calculator 10 Magnetic flux measuring means

Claims (1)

[Claims] 1. A power converter for supplying electric power to a permanent magnet type synchronous motor and a control device for controlling an output voltage of the power converter using a magnitude of a magnetic flux vector of a permanent magnet of the permanent magnet type synchronous motor. In the permanent magnet type synchronous motor control device, an acceleration mode in which an AC current of a predetermined magnitude is passed through the permanent magnet type synchronous motor to rotate the permanent magnet type synchronous motor to a predetermined number of revolutions, and the permanent magnet type synchronous motor A magnetic flux measuring current controller having a measurement mode in which the primary current of the synchronous motor is set to 0 or a very small value; and the permanent magnet type synchronization detected or estimated when the magnetic flux measuring current controller is in the measurement mode. A magnetic flux vector computing unit for calculating the magnetic flux vector by time-integrating the primary voltage vector of the motor; and A magnetic flux calculator for obtaining the magnitude of the flux vector; and a magnetic flux storage unit for storing the output of the magnetic flux calculator, and updating the magnitude of the magnetic flux vector stored in the magnetic flux storage. A control device for a permanent magnet type synchronous motor, wherein the magnetic flux measuring means is operated when necessary.