Method and apparatus for controlling motor
A control device and control method technology, which is applied in the direction of electronic commutation motor control, starting device, control system, etc., can solve the problems of motor vibration and noise, and achieve the effect of reducing vibration and noise
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[0046] figure 1 is a block diagram showing a motor control device according to an embodiment of the present invention. figure 2 and image 3 It is an explanatory diagram showing the structure of the motor. Figure 4 ~ Figure 6 yes means figure 1 Flowchart of the action of the motor control device shown ( Figure 4), the output waveform diagram (Figure 5) and the explanatory diagram ( Figure 6 ). Figure 7 and Figure 8 yes means figure 1 An explanatory diagram of a modified example of the motor control device shown.
[0047] 〔Motor control device〕
[0048] This motor control device 1 is a device that controls the drive of a motor (motor) M, and has a drive control unit 2 and a plurality of switching elements 3U to 3W (see Figure 1 ~ Figure 3 ). The motor M is, for example, a four-pole synchronous motor, has a plurality of energized phases (U-V phase, V-W phase, and W-U phase), and is connected to the motor control device 1 and the power supply S via a three-phase b...
Deformed example 1
[0059] In addition, in this motor control device 1, it is preferable to perform alignment of the rotor according to the rotational state of the rotor.
[0060] For example, it is preferable to align the rotor when the rotation speed of the rotor is equal to or less than a predetermined value after the operation of the motor M is completed (after the drive signal is stopped). In the above structure, since the rotor is aligned after the rotor is sufficiently decelerated (or stopped), there is an advantage that the rotor can be aligned smoothly.
[0061] Specifically, a rotation detection unit 5 that detects the rotational speed of the rotor is provided (refer to figure 1 ). The rotation detection unit 5 detects the rotational speed of the rotor, for example, by measuring an induced current generated by the rotation of the rotor. Then, after the drive control unit 2 stops the drive signal, the rotation detection unit 5 detects the rotation speed of the rotor and sends it to the...
Deformed example 2
[0065] In addition, in this motor control device 1 , it is preferable that the alignment of the rotor is performed after a predetermined time elapses after the operation of the motor is completed. For example, the drive control unit 2 has an internal timer (not shown), and uses this internal timer to measure the elapsed time from the stop of the drive signal. After a predetermined time has elapsed (for example, after 5 seconds), the drive control unit 2 generates an alignment signal. Thereby, there is an advantage that alignment of the rotor can be performed after the rotor is sufficiently decelerated or stopped. In addition, there is an advantage that it is possible to uniquely specify the timing of the alignment of the rotor without detecting the rotational speed of the rotor.
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