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Motor controller

A control device and motor technology, which is applied in the direction of electronic commutation motor control, single motor speed/torque control, control system, etc., can solve the problems of unusable, large phase difference between zero-cross position and position detection signal, and far-reaching maximum speed. Insufficient and other problems, to achieve low-cost reliability, the effect of improving the critical torque of misalignment

Inactive Publication Date: 2009-07-29
PANASONIC CORP
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Problems solved by technology

[0011] The 180° energization method cannot accurately grasp the zero-cross position of the induced voltage in absolute value because it passes through the integrating circuit. In addition, because the phase difference between the zero-cross position and the position detection signal becomes large depending on the operating status, it is necessary to Complicated control such as phase compensation is difficult to adjust and the control calculation is complicated
In addition, since the neutral point output terminal must be provided in the motor, and the third harmonic component of the induced voltage waveform is used, there is a problem that it cannot be used in a motor using a sine wave magnetized magnet.
[0012] In addition, in the sensorless sine wave 180° energization drive control using the current feedback method, since the magnetic pole position of the motor is estimated and calculated based on the motor current and the electric constant of the motor, there is an increase in the calculation error, and the lead angle control of the motor current is critical. Early, and the maximum speed is far less than the control with a position sensor

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Embodiment Construction

[0031] Hereinafter, embodiments of the motor control device according to the present invention will be described with reference to the drawings. figure 1 It is a control block diagram of the motor control device of this embodiment. The motor control device of this embodiment shows a motor control device that controls the rotational speed of the three-phase brushless DC motor 7 . In this figure, the motor control device includes: a DC-AC conversion mechanism 6, which converts a DC voltage 4 into an AC voltage, and outputs it to a three-phase brushless DC motor (hereinafter referred to as BLM) 7; an induced voltage detection mechanism 1, which Detect the induced voltage of BLM7; the magnetic pole position detection mechanism 2, which detects the magnetic pole position of the brushless DC motor according to the induced voltage; the voltage control mechanism 3, which outputs the voltage waveform according to the magnetic pole position output from the magnetic pole position detect...

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Abstract

A motor controller comprises AC / DC converting means having a plurality of switching elements, for converting a DC voltage to an AC voltage based on a PWM signal to output it to a 3-phase brushless DC motor by the switching elements, induced voltage detecting means for detecting an induced voltage of the brushless DC motor, magnetic polar position detecting means for detecting a magnetic polar position of the brushless DC motor from the induced voltage, voltage controlling means for outputting a voltage waveform based on the magnetic polar position output from the magnetic polar position detecting means, PWM controlling means for converting the voltage waveform to the PWM signal, and regenerative voltage detecting means for detecting a regenerative voltage included in the induced voltage.

Description

technical field [0001] The invention relates to a motor control device for a frequency-controlled brushless DC motor. Background technique [0002] Conventionally, there are 120° energization method and sine wave 180° energization method as motor control devices for controlling the rotational speed of brushless DC motors. [0003] The 120° energization method is a method of directly detecting the zero-cross signal of the induced voltage. In order to detect this signal, the phase voltage of the inverter is compared with the reference voltage. Based on this zero-cross signal, the commutation signal is changed. This zero-cross signal is generated 12 times in one rotation of the motor, and is generated once every mechanical angle of 30°, that is, an electrical angle of 60° (for example, refer to Patent Document 1). [0004] The 180° energization method is to amplify the differential voltage between the neutral point potential of the motor winding and the neutral point potentia...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P6/08H02P6/16H02P6/06H02P6/17H02P6/18H02P6/182
CPCH02P6/182
Inventor 东光英
Owner PANASONIC CORP