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Motor control device and method

A technology of motor control and control pair, which is used in motor control, electronic commutation motor control, DC motor speed/torque control, etc., and can solve problems such as inability to input and respond, inability to estimate rotor position, and shortening of pulse width.

Inactive Publication Date: 2004-11-03
SANYO ELECTRIC CO LTD +1
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Problems solved by technology

[0009] However, in the above-mentioned motor control device, in order to reduce the voltage applied to the motor, when the pulse width of the switching signal is shortened to reduce the duty ratio, the pulse width of the pulse-shaped induced voltage corresponding to the switching signal is also shortened. , when the pulse width of the induced voltage is too short, the input and response cannot be handled according to the characteristics of the rotor position detection circuit, and the rotor position cannot be estimated

Method used

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no. 2 Embodiment approach

[0061] In the above-mentioned first embodiment, a case was described in which the control unit 34 continuously lowers the carrier frequency B as the duty ratio decreases. The carrier frequency is stepped down. Furthermore, the configuration of the system is the same as that of the first embodiment figure 1 with figure 2 are the same, and therefore descriptions are omitted.

[0062] Figure 5 It is an explanatory diagram showing the carrier frequency corresponding to the duty ratio.

[0063] First, with the first embodiment Figure 4 Similarly, the control unit 34 sets the threshold value A (for example, 5 [%]) according to the duty ratio of the PWM switching signal.

[0064] Then, the control unit 34 lowers the carrier frequency B' stepwise as the duty ratio decreases so that the PWM with a duty ratio corresponding to the applied voltage (line voltage or phase voltage) C of the brushless DC motor 29 is generated. When switching signals, when the duty ratio of the PWM sw...

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Abstract

Provided is an apparatus and a method for controlling a motor which stabilizes the estimation of a rotor position even when a control for lowering the applied voltage to the motor is performed. The apparatus for controlling the motor estimates the position of the rotor (31) based on the induced voltage of non-energizing phase of a brushless DC motor (29) to be driven by an inverter (32), outputs a PWM switching signal pulse-width-modulated based on this estimated result to the inverter (32), and controls the applied voltage to the brushless DC motor (29). When the switching signal having the duty ratio corresponding to the applied voltage is generated, the apparatus includes a controller (34) for regulating the carrier frequency of the PWM switching signal so that the pulse width of the switching signal becomes a predetermined pulse width or more.

Description

technical field [0001] The invention relates to a motor control device and a motor control method, in particular to a motor control device and a motor control method for estimating the rotor position. Background technique [0002] Conventionally, it is known to estimate the position of the rotor from the induced voltage of the non-energized phase of the motor driven by the inverter, and to control the voltage applied to the motor by outputting a pulse width modulated switching signal to the inverter based on the estimated result. A motor control device (for example, refer to Patent Document 1). [0003] As the aforementioned motor, a brushless DC motor is known, which generally adopts a control method (sensorless control method) that detects an induced voltage and estimates the rotor position without providing a sensor for detecting the rotor position. Moreover, in the motor control device, for example, a 120-degree energization rectangular wave drive method is adopted to c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/08H02P6/06H02P6/18H02P6/182
CPCH02M7/527H02P6/085H02P6/182H02P2209/09Y10S388/912Y10S388/9281
Inventor 中山义纪高田元宫内拓
Owner SANYO ELECTRIC CO LTD
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