JPS6281498U - - Google Patents

Description

[Brief explanation of the drawing]

Figure 1 is an overview diagram showing one embodiment of this invention, and Figure 2a is an ideal (broken line) and actual (solid line) electric angle of magnetic flux orthogonal to each phase winding of the stator of a three-phase brushless motor. Figure 2b is a distribution diagram of the ideal (broken line) and corrected (solid line) distribution of each phase current with respect to the electrical angle, Figure 2c is a distribution diagram of each phase torque with respect to the electrical angle, Figure 2 d is a diagram showing the output torque of a three-phase brushless motor, Fig. 3 is an overview diagram showing a conventional three-phase brushless motor control device, and Fig. 4 is a diagram showing the output torque of a three-phase brushless motor.
Figure a is an ideal (broken line) and actual (solid line) distribution diagram of the magnetic flux perpendicular to each phase winding of the stator of a three-phase brushless motor with respect to the electrical angle. Figure 4 b is the electrical angle of each phase current in the conventional system. Distribution map for 4th
Figure c is a distribution diagram of the ideal (dashed line) and actual (solid line) distribution of each phase torque with respect to the electrical angle, and Figure 4 d is the ideal (dashed line) and actual (solid line) output torque of a three-phase brushless motor. FIG. In the figure, 1 is an inverter, 2 is a base drive circuit, 20 is a power amplifier, 3 is a three-phase brushless motor, 4 is a resolver, 5 is an R/D converter, 6 is a triangular wave generator, 7 to 9 are ROMs, 10 ~12 is D
/A converter, 13 to 15 are comparators, 16 is a Hall element, 17 to 19 are multipliers, and 21 and 22 are three-phase brushless motor control devices. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] A three-phase brushless motor magnetized in the form of a cosine wave, a resolver that detects the rotation angle of the rotor of the three-phase brushless motor, a power amplifier that rotates the three-phase brushless motor, and a digital signal that converts the output signal of the resolver. A resolver digital converter R/D that converts the output signal into a digital output signal, three read-only memory ROMs that generate a torque ripple correction pattern from the digital output signal of the resolver digital converter, and multiply the read-only memory output by the current command, A three-phase brushless motor control device comprising three D/A converters that convert into analog signals.