JPH11299282A - Initial adjustment device for brushless motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To align the electrical position of a brushless motor to the zero position of an angle detector accurately in a short time, when driving the motor. SOLUTION: The U-phase induced voltage of a brushless motor 1 is input to an A/D converter 12, which then outputs voltage data (C). An angle detector 3 is installed concentricaly with the motor 1, and an angle signal (B) is output from the angle detector 3 to an angle converter 4, which then outputs an angle data (D). A central processing unit 5 is input with these data (C) and (D) and then calculates a U-phase current command with a constant torque command and finds an angle, at which induced voltage is zero and this angle is used as an alignment parameter. This parameter is stored in the central processing unit 5 and is used as a parameter for driving the motor hereafter. Through this method, parameter calculation can be made automatically, compared with the conventional method wherein parameter calculation is conducted manually.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an initial adjustment device for a brushless motor that adjusts an electrical position of the motor when driving the brushless motor and a zero position of an angle detector.

[0002]

2. Description of the Related Art When a brushless motor is driven, it is necessary to adjust the electrical position of the motor and the zero position of an angle detector as initial adjustment. FIG. 3 shows a conventional initial adjustment method. As shown in FIG. 3, conventionally, a U-phase induced voltage (A) obtained when the brushless motor 1 is driven from the outside and an angle signal obtained from an angle detector 3 coaxially connected to the brushless motor 1 (B)
Is added to the angle data (D) converted by the angle converter 4 by manual setting 6 with an appropriate positioning parameter as an offset, and the U phase calculated by the central processing unit 5 based on the value obtained The current command (E) is adjusted visually by using a measuring instrument 2 such as an oscilloscope to adjust the alignment parameter to adjust the zero position.

As described above, in the conventional method of initial adjustment of a brushless motor, man-hours are required each time to adjust the zero point, and there is a problem in productivity. In addition, there is a variation depending on the operator, and there is a case where the performance of the motor cannot be fully utilized due to insufficient adjustment.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a brushless motor which is constructed so that the adjustment of the electrical position of the motor when driving the brushless motor and the zero position of the angle detector can be accurately performed in a short time. It is an object to provide an initial adjustment device for a motor.

[0005]

According to the present invention, there is provided a rotating means for rotating a brushless motor from the outside, a rotating angle detecting means for detecting a rotating angle of the motor, and a motor having a predetermined phase. A torque command unit that performs a torque command, and an induced voltage detection unit that detects an induced voltage generated in the predetermined phase by rotation by the rotation unit;
Provided is an initial adjustment device for a brushless motor, comprising: a setting unit that sets, as an offset angle, an angle at which a phase of a torque signal corresponding to the torque command and a phase of an induced voltage detected by the induced voltage detection unit match.

With such a device, the zero point adjustment of the motor is automatically set by the setting unit and is used for the subsequent motor drive, so that the time required for the zero point adjustment is reduced, and the setting variation by the operator is eliminated.

[0007]

Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a configuration diagram of an initial adjustment device for a brushless motor according to one embodiment of the present invention. In the figure, reference numerals 1, 3 to 5 and (A),
Since (B) and (D) are the same as the conventional configuration, they will be referred to as they are, but the feature of the present invention is that the arithmetic processing in the AD converter 12 and the central processing unit 5 has a characteristic. For convenience of explanation, the central processing unit will be described in detail below using the same reference numeral 5 as the conventional one.

In FIG. 1, the U-phase induced voltage (A) obtained by externally driving the brushless motor 1 is:
The data is converted into voltage data (C) by the AD converter 12 and sent to the central processing unit 5. The angle signal (B) detected by the angle detector 3 coaxially connected to the brushless motor 1 is converted into angle data (D) by the angle converter 4 and sent to the central processing unit 5.

The central processing unit 5 calculates an alignment parameter according to the flow of FIG. 2 based on the voltage data (C) and the angle data (D). Note that, in order to compare the calculation of this parameter with the manual setting 6 of the conventional example, it is shown as an automatic setting 16 in the figure.

[0010] The calculated parameters are stored in the central processing unit 5 and thereafter applied as parameters for driving the motor.

In the configuration connected as shown in FIG. 1, the central processing unit 5 calculates the U-phase current command Uc as shown by the following equation.

[0012]

(Equation 1)

When the motor 1 is driven from the outside and the induced voltage of the U-phase is Vu, an offset that satisfies Uc = 0 is obtained from equation (1) when Vu = 0. That is, Vu = 0
At this angle, an offset that satisfies sin (nθ + offset) = 0 can be obtained.

Next, FIG. 2 shows a flowchart for obtaining the alignment parameters in the central processing unit 5. The outline is as follows. In S1, the U-phase induced voltage is read from the AD converter 12, and in S2, the angle detection signal from the angle detector 4 is read. Next, in S3, the central processing unit 5 sets the torque command to be constant, and calculates the U-phase current command shown by the equation (1). In S4, it is checked whether or not the motor has rotated and the induced voltage has become substantially "0". If it is not "0", the process returns to the beginning S1, and if "0", the angle at that time is set in S5. Set as matching parameters,
Apply.

The alignment parameters obtained by the flow of FIG. 2 are stored in the central processing unit 5 and thereafter applied, whereby the zero position of the brushless motor can be automatically adjusted.

According to the brushless motor initial adjusting device of the embodiment of the present invention, the brushless motor 1
Angle detector 3 that rotates coaxially with the rotor unit, an AD converter 12 for obtaining an induced voltage of the motor 1, an angle converter 4 that converts an angle signal of the angle detector 3 into electric data, and an optimum position. An automatic zero position adjusting mechanism comprising a central processing unit 5 for calculating an alignment parameter, having the following features.

Voltage data (C) obtained from the motor 1
From the angle data (D), a parameter for adjusting the zero point position of the brushless motor 1 can be automatically calculated. In addition, the automatic calculation of such parameters makes it possible to reduce the time required for zero point adjustment and eliminate variations due to the operator, so that the performance of the motor 1 can be fully utilized.

[0018]

According to the present invention, there is provided an initial adjustment apparatus for a brushless motor, comprising: a rotating means for rotating the brushless motor from outside; a rotating angle detecting means for detecting a rotating angle of the motor; and a torque command to a predetermined phase. A torque command unit to perform, an induced voltage detecting means for detecting an induced voltage generated in the predetermined phase by rotation by the rotating means, a torque signal corresponding to the torque command, and the induced voltage detected by the induced voltage detecting means. A setting unit for setting an angle at which the phase of the induced voltage matches as an offset angle. With such a device, parameters for zero position adjustment are automatically calculated, and the time required for zero point adjustment is reduced,
Variations caused by the operator can be eliminated.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an initial adjustment device for a brushless motor according to an embodiment of the present invention.

FIG. 2 is a flowchart for calculating a positioning parameter of the brushless motor according to one embodiment of the present invention.

FIG. 3 is a configuration diagram of a conventional initial adjustment device for a brushless motor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Brushless motor 3 Angle detector 4 Angle converter 5 Central processing unit 12 AD converter 16 Automatic setting

Claims (1)

[Claims] 1. A rotating means for rotating a brushless motor from the outside, a rotating angle detecting means for detecting a rotating angle of the motor, a torque commanding section for giving a torque command to a predetermined phase, and a rotation by the rotating means. An induced voltage detecting means for detecting an induced voltage generated in the predetermined phase, and an offset angle at which the phase of the induced voltage detected by the induced voltage detecting means coincides with the torque signal corresponding to the torque command. An initial adjustment device for a brushless motor, comprising: