Rotating armature controller

Abstract

A motor driving error is prevented. In concrete, disturbance in a rotation detection signal of a resolver due to motor noise is reduced. An inverter is controlled to set output torque of a rotating armature at target torque using the target torque, rotation speed and a rotation angle of the rotating armature. Three-phase/two-phase modulation takes place, wherein control of the inverter is changedfrom three-phase modulation to two-phase modulation when a modulation ratio expressed as a ratio of voltage applied to the rotating armature for voltage input to the inverter is larger than three-phase/two-phase modulation changeover boundary. Even in a three-phase modulation region where the modulation ratio is smaller than the three-phase/two-phase modulation changeover boundary, the modulationis changed over to the two-phase modulation in a specific region where torque of the rotating armature corresponding to the mentioned boundary, a torque threshold lower than the rotation speed and electric noise applied by the rotating armature exceeding the rotation speed threshold to the resolver are large. In an embodiment using step-up voltage (Vuc), the torque threshold is made to be the lower the higher the step-up voltage, to enlarge the specific region.

Description

technical field [0001] The present invention relates to a rotating electrical machine control device that controls electric power supplied from an inverter to a motor and generated power in the opposite direction, and in particular, relates to control of an inverter control mode, that is, a modulation mode, in a rotating electrical machine control device including a resolver. The rotating electrical machine control device of the present invention can be used, for example, in an electric vehicle (EV) that drives wheels by an electric motor, and in addition to the electric motor, also includes a fuel engine and a generator that is rotationally driven by the engine (sometimes referred to as an electric motor or electric generator). motor generator) for hybrid electric vehicles (HEV). Background technique [0002] The three-phase modulation mode of the three-phase inverter generates three-phase alternating current by means of three-phase PWM switching conversion and applies it t...

AI Technical Summary

Problems solved by technology

In the case of wheel drive motors, since the energizing current is large, the switching noise is strong, and there is a high possibility that the rotation detection signal of the resolver will be disturbed.

[0011] Assuming that if the waveform of the rotation detection signal (sine wave or cosine wave) of the resolver is deformed due to the action of noise, the rotation angle detection value θ of the motor will be wrong, and the motor cannot be controlled correctly by vector control.

In particular, in the three-phase modulation mode, since the switching times of the inverter are many, if it becomes a high torque (high current) output, the electromagnetic noise will increase due to the increase of the high-order harmonic component of the current. Larger, the possibility of disturbance of the rotation detection signal of the resolver becomes higher

In addition, in the three-phase modulation mode, if the number of revolutions increases, the secondary side voltage (output voltage) of the converter (booster circuit) increases, so the inverter voltage is increased, and the switching of the inverter is changed. The generated electric field noise becomes stronger, and the possibility of disturbance of the rotation detection signal of the resolver becomes higher.

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