JP4543669B2 - Motor drive device, motor, equipment - Google Patents

Description

  The present invention relates to a motor drive device for driving a motor mounted on information devices such as copiers, printers, optical media devices, and hard disk devices, and devices such as air conditioners, air purifiers, and water heaters. . Furthermore, the present invention relates to a motor driven by the driving device and a device equipped with the motor driven by the driving device.

  For example, brushless DC motors (hereinafter referred to as motors) are often used for various drive motors mounted on air conditioning equipment or information equipment, taking advantage of long life, high reliability, and ease of speed control. Many.

  FIG. 17 is a circuit configuration diagram of a conventional motor driving device. FIG. 18 is a diagram for explaining the operation of the motor drive device shown in FIG. 17, that is, signal waveform diagrams of each part of the circuit with respect to the motor rotation angle (electrical angle).

  In FIG. 17, the motor driving apparatus shown in FIG. 17 detects the position of the rotor of the motor using a plurality of position detecting elements 901, 903, and 905 made up of Hall elements. The three-phase distributor 890 receives position signals Hu, Hv, and Hw from the respective position detection elements 901, 903, and 905, and outputs the three-phase distribution signals UH0, UL0, VH0, VL0, WH0, and WL0 to a pulse width modulator. (PWM modulator) Outputs to 840. The speed setting device 860 outputs a speed setting signal S to one input terminal of the comparator 850. The triangular wave oscillator 847 outputs a carrier signal CY to the other input terminal of the comparator 850. Comparator 850 compares signal S and signal CY, and outputs a signal having a pulse width corresponding to signal S to pulse width modulator 840. Thereby, the pulse width modulator 840 modulates the signals UH0, UL0, VH0, VL0, WH0, and WL0 into signals having a pulse width corresponding to the signal S, and each of the modulated signals to the gate driver 830. Output. The energizer 820 receives each signal from the gate driver 830 and controls the six transistors constituting the energizer 820 to be sequentially turned on or off based on the signal.

  Thus, the power supply to the three-phase drive coils 811, 813 and 815 provided in the motor stator is sequentially switched according to the rotor position, as shown by the signals U, V and W shown in FIG. No motor rotates.

  In the case of such a conventional circuit configuration, it is necessary to maintain the function of the circuit as follows when the motor is started. That is, the output terminals s1h, s2h, and s3h of the buffers 831, 833, and 835 in the gate driver are set to the same potential as the ground every certain period, and the output terminals g1h, g2h, and g3h of the buffers 831, 833, and 835 are It is necessary to retain a circuit function for outputting a signal. Because the buffers 831, 832, 833, 834, 835, and 836 receive the signals G 1 H, G 1 L, G 2 H, G 2 L, G 3 H, and G 3 L, respectively, and operate the transistors 821, 822, 823, 824, 825, and 826, respectively: This is because a sufficient voltage is output from the output terminals g1h, g1L, g2h, g2L, g3h, and g3L.

Among them, the outputs from the terminals g1L, g2L and g3L are such that the source terminals of the transistors 822, 824 and 826 are connected to the ground, so that the transistors 822, 824 and 826 are turned on if there is a sufficient voltage difference from the ground. Can be made. However, the outputs from the terminals g1h, g2h, and g3h need to have a sufficient voltage difference with respect to the voltages at the terminals s1h, s2h, and s3h, not the voltage difference from the ground. Since the terminals s1h, s2h, and s3h connected to the source terminals of the transistors 821, 823, and 825 are also connected to the drive coils 811, 813, and 815, respectively, the transistors 821, 822, 823, 824, 825, and 826 are connected. Each of the terminals s1h, s2h, and s3h varies with the on / off state. When the transistors 821, 823, and 825 are turned on, the voltages at the terminals s1h, s2h, and s3h become the power supply voltage Vdc. When a voltage higher than this voltage is not supplied from the outside, it is necessary to create the voltage. To this end, a capacitor is connected to each of the terminals s1h, s2h and s3h, and the terminals s1h, s2h and s3h have the same potential as the ground. Then, each capacitor is charged with a voltage sufficient to operate transistors 821, 823, and 825. Then, the buffer 831 outputs an addition voltage of the charging voltage and the voltage of the terminal s1h from the terminal g1h. The buffer 833 outputs the added voltage of the charging voltage and the voltage of the terminal s2h from the terminal g2h. The buffer 835 outputs the added voltage of the charging voltage and the voltage at the terminal s3h from the terminal g3h. As described above, in order to charge each capacitor, the terminals s1h, s2h, and s3h must be set to the same potential as the ground at regular intervals. If the capacitors are not sufficiently charged, the transistors 821, 823, and 825 cannot be turned on. As a result, the three-phase coils 811, 813 and 815 are not normally energized and the motor does not rotate.

  As a specific circuit operation, normally, when the transistors 821, 823, and 825 in the energizer 820 are off, the terminals s1h, s2h, and s3h are forcibly grounded by turning on the transistors 822, 824, and 826. It is said.

  However, during the circuit operation, the drive coils 811, 813 and 815 are connected to each other via the transistors 822, 824 and 826, so that the motor is in a brake state. This state does not cause a problem during normal driving, but when the motor is decelerated, it is decelerated suddenly by the brake, resulting in increased vibration and noise.

In addition, a motor torque control method in another conventional motor driving apparatus is as follows. In other words, as a method for reducing motor vibration and noise, when changing the target rotational speed of the motor, the torque compensation amount of the torque pattern is once made narrower than the predetermined value to reach the target rotational speed. After that, the torque compensation amount is returned to a predetermined value after a predetermined time has elapsed. (For example, see Patent Document 1)
JP, 2002-27777, A By the above-mentioned conventional motor drive device, vibration and noise during the drive of a motor are possible by this method. However, in this device, a complicated circuit operation in which the torque compensation amount width of the torque pattern is once narrower than a predetermined value, and after reaching a target rotational speed, the torque compensation amount is returned to the predetermined value after a predetermined time has elapsed. It was necessary and complicated control had to be performed.

  In addition, the vibration at the time of deceleration resonates with the equipment on which the motor is mounted and causes noise, or the vibration of the motor is transmitted to vibrate the equipment, which hinders improvement in the quality and performance of the entire equipment. There was a fear.

  The present invention solves the above-described problems, and an object of the present invention is to provide a motor drive device that can realize low vibration and low noise with a simple configuration when the motor is driven.

In a motor drive device of the present invention, a motor driven by the motor drive device, and a device equipped with a motor driven by the motor drive device, the motor drive device has the following configuration.
(A) a motor having a three-phase drive coil;
(B) an energizer for energizing the drive coil;
(C) an energization controller for controlling an energization method performed by the energizer with respect to the drive coil, and the energization controller includes:
In the first energization period from the stop state of the motor to a predetermined set rotational speed, each coil potential during the period in which the voltage is applied to the drive coil is turned on or off by turning on or off the transistor in the energizer. Control to either potential,
In the second energization period driven exceeding the set rotational speed, each coil potential in the period in which the voltage is applied to the drive coil is set to the power supply voltage potential, or the transistor in the energizer is turned off to turn the drive coil on. Control to open. Specifically, it is as follows.

The first invention of the present invention is: (a) a motor having a three-phase drive coil;
(B) an energizer for energizing the drive coil;
(C) having a configuration including an energization controller for controlling an energization method performed by the energizer on the drive coil;
The energization controller has a configuration including a position detector, a rotation speed detector, an energization signal generator, a pulse width modulator, and a gate driver.
Furthermore, a triangular wave signal and a speed command signal are provided, and a comparator that compares the voltage between the triangular wave signal and the speed command signal is provided.
The energizer includes an upper arm transistor and a lower arm transistor connected to a first terminal of the drive coil, and a connection point between the upper arm transistor and the lower arm transistor and a first of the drive coil. A second terminal of the drive coil is connected to a neutral point of the motor,
In the energization signal generator, a position detection signal from the position detector and an energization period detection signal from the rotation speed detector are input, and an energization waveform signal is output from the energization signal generator,
The pulse width modulator is connected to the energization waveform signal and connected to the output terminal of the comparator,
The energization waveform signal has a configuration in which the drive coil is energized by being input to the energizer via the pulse width modulator and the gate driver,
The energization signal generator outputs a first energization waveform signal and a second energization waveform signal based on the energization period detection signal output from the detector, and outputs a first energization waveform signal from a motor stop state to a predetermined set rotational speed. The first energization waveform signal is output during one energization period, and the second energization waveform signal is output during the second energization period driven exceeding the set rotational speed,
In the first energization period, control of each coil potential in the energization period in which a voltage is applied to the drive coil based on the first energization waveform signal is performed when the transistor of the upper arm in the energizer is turned on. it turns off the transistors of the lower arm, also possible to turn on the transistors of the lower arm in the off transistors of the upper arm Conversely, by repeating the capital, the potential of the power supply voltage the coils potential it and, to repeat and that the potential of the ground the respective coils potential,
In the second energization period, the coil potential in the energization period in which a voltage is applied to the drive coil based on the second energization waveform signal is set to be lower when the transistor of the upper arm in the energizer is turned on. and that the potential of the power supply voltage to turn off the transistors of the arm, configured to control so as to repeat the opening the off to the drive coil the transistors of the lower arm in the off transistors of the upper arm It is a motor drive device which comprises.

According to a second aspect of the present invention, in the first aspect,
The motor drive device in which at least one energization angle in the first energization period or the second energization period is an arbitrary energization angle of 120 ° to 180 ° in electrical angle.

According to a third aspect of the present invention, in the motor drive device according to claim 1,
And a wide-angle energizer for energizing the drive coil with an electrical angle of 150 °.
The wide-angle energizer comprises a configuration capable of detecting an overlapping period in which adjacent drive coils of the drive coils are in the same energized state,
The energization controller has a configuration in which the magnitude of energization to the drive coil is a first value during the overlap period and the magnitude of the energization is a second value during periods other than the overlap period. This is a motor drive device.

  A fourth invention of the present invention is the motor drive device according to the third invention, wherein a ratio of the first value to the second value is sin (π / 3): 1.

  A fifth invention of the present invention is a motor comprising the motor drive device of the first invention.

  In a sixth aspect of the present invention based on the fifth aspect, at least one energization angle in the first energization period or the second energization period is an arbitrary energization angle of 120 ° to 180 ° in electrical angle. It is a motor.

  According to a seventh aspect of the present invention, in the fifth aspect of the present invention, the electronic device further includes a wide-angle energizer for energizing the drive coil with an electrical angle of 150 °, wherein the wide-angle energizer includes the drive coil. Among them, a configuration is provided that can detect an overlap period in which adjacent drive coils are in the same energized state, and the energization controller sets the magnitude of energization to the drive coil as a first value during the overlap period. The motor includes a configuration in which the magnitude of the energization is a second value during a period other than the overlap period.

  An eighth invention of the present invention is the motor according to the seventh invention, wherein the ratio of the first value to the second value is sin (π / 3): 1.

  A ninth invention of the present invention is an apparatus equipped with the motor drive device of the first invention.

  According to a tenth aspect of the present invention, in the ninth aspect, at least one energization angle in the first energization period or the second energization period is an arbitrary energization angle of 120 ° to 180 ° in electrical angle. It is a certain device.

  The eleventh invention of the present invention is based on the ninth invention, further comprising a wide-angle energizer for energizing the drive coil with an electrical angle of 150 °, wherein the wide-angle energizer is connected to the drive coil. Among them, a configuration is provided that can detect an overlap period in which adjacent drive coils are in the same energized state, and the energization controller sets the magnitude of energization to the drive coil as a first value during the overlap period. , And a device in which the magnitude of the energization is a second value during the period other than the overlap period.

  A twelfth aspect of the present invention is the device according to the eleventh aspect, wherein the ratio of the first value to the second value is sin (π / 3): 1.

  Vibration and noise when driving the motor can be greatly reduced.

  EMBODIMENT OF THE INVENTION The form for inventing is demonstrated using an Example.

  FIG. 1 is a circuit configuration diagram of a motor drive device according to a first embodiment of the present invention, and FIG. 2 is an operation explanatory diagram of the motor drive device shown in FIG.

  Here, a case will be described in which the energization of each of the three-phase drive coils is energized by a rectangular wave energization waveform with an electrical angle of 120 ° in the first and second energization periods.

  In FIG. 1, the motor 10 has a three-phase drive coil including a U-phase drive coil 11, a V-phase drive coil 13, and a W-phase drive coil 15. Each drive coil is connected to the energizer 20 as follows. The electrification device 20 constitutes an upper arm by three field effect transistors (FETs) 21, 23 and 25, and constitutes a lower arm by the transistors 22, 24 and 26. A first terminal of the U-phase drive coil 11 is connected to a connection point between the transistors 21 and 22. A first terminal of the V-phase drive coil 13 is connected to a connection point between the transistors 23 and 24. A first terminal of the W-phase drive coil 15 is connected to a connection point between the transistors 25 and 26. The second terminals of the U-phase drive coil 11, the V-phase drive coil 13, and the W-phase drive coil 15 are connected to each other to form a neutral point N.

  A positive power supply terminal (power supply voltage Vdc) of a DC power supply (not shown) is connected to each transistor of the upper arm of the energizer 20. On the other hand, the negative power supply terminal (not shown) of the DC power supply is connected to the ground. Each transistor of the lower arm of the energizer 20 is also connected to ground. With such a circuit configuration, electric power is supplied to the three-phase drive coil from the DC power source through the upper arm transistor group and the lower arm transistor group of the energizer 20.

  The position detectors 101, 103, and 105 are configured by Hall elements or Hall ICs. The detectors 101, 103, and 105 are each phase drive coil of a mover of the motor 10 (not shown; a rotor is used for a rotary motion motor, a mover is used for a linear motion motor, and the rotor is hereinafter described as a rotor). Detect positions relative to 11, 13 and 15. The respective position detection signals Hu, Hv and Hw output from the detectors 101, 103 and 105 are input to the energization signal generator 90. The energization signal generator 90 outputs energization waveform signals UH0, UL0, VH0, VL0, WH0, and WL0 as shown in FIG. 2 to the pulse width modulator (PWM modulator) 40. When the signals UH0, UL0, VH0, VL0, WH0, and WL0 are at “H” level, the transistors 21, 22, 23, 24, 25, and 26 that constitute the energizer 20 are turned on, and conversely “L”. It is configured to turn off at the level. The signals UH0, VH0, and WH0 have a phase difference of 120 electrical degrees, and the signals UL0, VL0, and WL0 also have a phase difference of 120 electrical degrees.

  Here, a rotation speed detector 70 is further connected to the energization signal generator 90. Thus, the energization signal generator 90 is based on the energization period detection signal OL1 output from the detector 70, as shown in the left diagram of FIG. 2 during the first energization period from the motor stop state to a predetermined set rotational speed. In the second energization period in which the first energization waveform signal is driven exceeding the predetermined set rotational speed, a second energization waveform signal as shown in the right diagram of FIG. 2 is output.

  The pulse width modulator 40 includes AND gates 41, 43, and 45, and AND gates 42, 44, and 46 that are one-side inverter inputs. Signals UH0, VH0, and WH0 are input to one input terminals of the gates 41, 43, and 45, respectively. The other input terminals of the gates 41, 43 and 45 are connected in common and connected to the output terminal of the comparator 50. Signals UL0, VL0, and WL0 are input to one input terminals of the AND gates 42, 44, and 46, respectively. The output terminals of the gates 41, 43 and 45 are connected to the inverter input terminal which is the other input terminal of the AND gates 42, 44 and 46, respectively. The comparator 50 compares the voltage of the speed command signal S output from the speed setter 60 with the triangular wave signal CY output from the triangular wave generator 47. The signal CY is a so-called carrier signal in pulse width modulation, and its frequency is (several kHz to several hundred kHz), and is set to be considerably higher than the frequency of the signal S.

  The gate driver 30 includes buffers 31, 32, 33, 34, 35 and 36. The buffers 31, 33, and 35 receive the output signals G1H, G2H, and G3H of the gates 41, 43, and 45, respectively. The buffers 32, 34, and 36 receive the output signals G1L, G2L, and G3L of the gates 42, 44, and 46, respectively.

  Output signals g1h, g1L, g2h, g2L, g3h, and g3L from the output terminals of the buffers 31, 32, 33, 34, 35, and 36 are input to the gates of the transistors 21, 22, 23, 24, 25, and 26, respectively. Is done.

  The other output terminals (output signals s1h, s2h, and s3h) of the buffers 31, 33, and 35 are connected to the connection point between the transistors 21 and 22, the connection point between the transistors 23 and 24, and the transistors 25 and 26, respectively. Connected to the connection point.

  Here, the energization controller 100 for controlling the energization method performed by the energizer 20 on the three-phase drive coils 11, 13 and 15 includes a position detector 101, 103, 105, a rotation speed detector 70, an energization signal. A generator 90, a pulse width modulator 40 and a gate driver 30 are included.

  The operation of the motor driving apparatus of the first embodiment configured as described above will be described with reference to FIG. FIG. 2 is an operation explanatory diagram of the energization controller 100.

  The position detection signals Hu, Hv, and Hw have a phase difference of an electrical angle of 120 ° as shown in the operation time chart of FIG.

  The energization signal generator 90 generates energization waveform signals UH0, UL0, VH0, VL0, WH0, and WL0 using the signals Hu, Hv, and Hw according to the time chart shown in FIG. By inputting these signals UH0, UL0, VH0, VL0, WH0, and WL0 to the energizer 20 through the pulse width modulator 40 and the gate driver 30, the motor 10 is driven. In the motor drive, the energization controller 100 is shown in the left diagram of FIG. 2 for the three-phase drive coil terminals U, V, and W of the motor 10 during the first energization period from the stop state to the predetermined set rotational speed. In this way, control is performed so as to supply power in an energization cycle in which an electrical angle of 120 ° is energized.

  In this case, the signals G1H, G1L, G2H, G2L, G3H, G3L are respectively connected to the corresponding transistors 21, 22, 23, 24, via the corresponding buffers 31, 32, 33, 34, 35, 36, respectively. 25 and 26. When attention is paid to the energization period with an electrical angle of 120 °, the transistors 21, 23, and 25 in the energizer 20 are turned on or off, and the transistors 22, 24, and 26 in the energizer 20 are turned off or on. Accordingly, the drive coil terminals U, V, and W are controlled so as to have either the power supply voltage or the ground potential.

  This will be described in more detail. When the signal G1H is at “H” level, the signal g1h via the buffer 31 is also at “H” level. At that time, the signal G1L is at the “L” level, and the signal g1L via the buffer 32 is also at the “L” level. In this state, the transistor 21 is turned on, the transistor 22 is turned off, and the drive coil terminal U becomes substantially equal to the potential of the power supply voltage Vdc. Actually, the drive coil terminal U has a potential obtained by subtracting a voltage drop corresponding to the ON voltage between the source and drain of the transistor 21 from the power supply voltage Vdc. The on-voltage between the source and drain is a value that is negligibly smaller than the power supply voltage Vdc. (The same applies to the drive coil terminal V and the drive coil terminal W) Therefore, in the claims of the present invention, the expression “each coil potential is set to the potential of the power supply voltage” is used.

Conversely, when the signal G1H is at "L" level, the signal g1h via the buffer 31 is also at "L" level. At that time, the signal G1L is at the “H” level, and the signal g1L via the buffer 32 is also at the “H” level. In this state, the transistor 21 is turned off, the transistor 22 is turned on, and the drive coil terminal U is substantially equal to the ground potential. Actually, the drive coil terminal U has a potential obtained by adding the on-voltage between the source and drain of the transistor 22 to the ground potential. The on-voltage between the source and drain is a value that is negligibly smaller than the power supply voltage Vdc. (The same applies to the drive coil terminal V and the drive coil terminal W) Accordingly, in the claims of the present invention, the expression “each coil terminal U is set to the ground potential” is used.

  Similarly, when the signal G2H is at “H” level, the signal g2h via the buffer 33 is also at “H” level. At that time, the signal G2L is at the “L” level, and the signal g2L via the buffer 34 is also at the “L” level. In this state, the transistor 23 is turned on, the transistor 24 is turned off, and the drive coil terminal V becomes substantially equal to the potential of the power supply voltage Vdc. Conversely, when the signal G2H is at "L" level, the signal g2h via the buffer 33 is also at "L" level. At that time, the signal G2L is at the “H” level, and the signal g2L via the buffer 34 is also at the “H” level. In this state, the transistor 23 is turned off, the transistor 24 is turned on, and the drive coil terminal V becomes substantially equal to the ground potential.

  Similarly, when the signal G3H is at “H” level, the signal g3h via the buffer 35 is also at “H” level. At that time, the signal G3L is at the “L” level, and the signal g3L via the buffer 36 is also at the “L” level. In this state, the transistor 25 is turned on, the transistor 26 is turned off, and the drive coil terminal W becomes substantially equal to the potential of the power supply voltage Vdc. Conversely, when the signal G3H is at "L" level, the signal g3h via the buffer 35 is also at "L" level. At this time, the signal G3L is at the “H” level, and the signal g3L via the buffer 36 is also at the “H” level. In this state, the transistor 25 is turned off, the transistor 26 is turned on, and the drive coil terminal W becomes substantially equal to the ground potential.

  As apparent from the above, the outputs of the buffers 32, 34, and 36 correspond to the “L” level and the “ Repeat the change of the “H” level. Thus, since the transistors 22, 24, and 26 are periodically turned on, the terminals s1h, s2h, and s3h periodically become the ground potential, and the buffer function is maintained.

  Next, in the second energization period that is driven exceeding the above-mentioned predetermined set rotational speed, the energization controller 100 controls the three-phase drive coil terminals U, V, and W of the motor 10 with respect to the right side of FIG. Power supply control as shown in the figure is performed.

  That is, the signals G1H, G1L, G2H, G2L, G3H, and G3L are respectively connected to the corresponding transistors 21, 22, 23, 24, and 25 via the corresponding buffers 31, 32, 33, 34, 35, and 36, respectively. , 26. When attention is paid to the energization period with an electrical angle of 120 °, the transistors 21, 23, 25 in the energizer 20 are turned on or off, and the transistors 22, 24, 26 in the energizer 20 are turned off. The terminals U, V, and W are controlled to be substantially equal to or open to the potential of the power supply voltage.

  This will be described in more detail. When the signal G1H is at “H” level, the signal g1h via the buffer 31 is also at “H” level. At that time, the signal G1L is at the “L” level, and the signal g1L via the buffer 32 is also at the “L” level. In this state, the transistor 21 is turned on, the transistor 22 is turned off, and the drive coil terminal U becomes substantially equal to the potential of the power supply voltage Vdc. On the other hand, when the signal G1H is at “L” level, the signal g1h via the buffer 31 is also at “L” level. At that time, the signal G1L maintains the “L” level, and the signal g1L via the buffer 32 also maintains the “L” level. In this state, both the transistor 21 and the transistor 22 are turned off, and the drive coil terminal U is opened.

  Similarly, when the signal G2H is at “H” level, the signal g2h via the buffer 33 is also at “H” level. At that time, the signal G2L is at the “L” level, and the signal g2L via the buffer 34 is also at the “L” level. In this state, the transistor 23 is turned on, the transistor 24 is turned off, and the drive coil terminal V becomes substantially equal to the potential of the power supply voltage Vdc. On the other hand, when the signal G2H is at "L" level, the signal g2h via the buffer 33 is also at "L" level. At that time, the signal G2L maintains the “L” level, and the signal g2L via the buffer 34 also maintains the “L” level. In this state, both the transistor 23 and the transistor 24 are turned off, and the drive coil terminal V is opened.

  Similarly, when the signal G3H is at “H” level, the signal g3h via the buffer 35 is also at “H” level. At that time, the signal G3L is at the “L” level, and the signal g3L via the buffer 36 is also at the “L” level. In this state, the transistor 25 is turned on, the transistor 26 is turned off, and the drive coil terminal W becomes substantially equal to the potential of the power supply voltage Vdc. On the other hand, when the signal G3H is at "L" level, the signal g3h via the buffer 35 is also at "L" level. At that time, the signal G3L maintains the “L” level, and the signal g3L via the buffer 36 also maintains the “L” level. In this state, both the transistor 25 and the transistor 26 are turned off, and the drive coil terminal W is opened.

  In FIG. 2, since the horizontal axis is represented by an electrical angle, the length of the 120 ° energization period in the first energization period and the second energization period is the same. However, the driving speed is higher in the second energization period than in the first energization period. In terms of time, the 120 ° energization period of the second energization period is shorter than that of the first energization period. Accordingly, in the second energization period, the transistors 22, 24, and 26 are turned on by the on-signals G1L, G2L, and G3L of the transistors at regular intervals as shown in the right diagram of FIG. 2 and in a shorter period than the first energization period. Turns on at regular and short cycles. As a result, capacitors (not shown) connected to the terminals s1h, s2h, and s3h are charged in a regular and short period, and each capacitor maintains a necessary charging voltage without discharging. . Therefore, when the transistors 21, 23, and 25 are turned on next time, the buffer 31 outputs the added voltage of the charging voltage and the voltage of the terminal s1h from the terminal g1h. The buffer 33 outputs an addition voltage of the charging voltage and the voltage of the terminal s2h from the terminal g2h. The buffer 35 outputs an addition voltage of the charging voltage and the voltage of the terminal s3h from the terminal g3h. Thus, each of the buffers 31, 33, and 35 can secure a sufficient voltage as the signal voltage of the output signals g1h, g2h, and g3h, and can maintain the function of the buffer.

  Further, as in the prior art, the terminals s1h, s2h, and s3h need not be forced to the ground potential. That is, when the transistors 21, 23 and 25 are turned off, the current supply from these transistors is stopped, but the current flowing through the drive coil tends to continue to flow due to the characteristics of the coil. As a result, each diode (not shown) connected in parallel to the transistors 22, 24 and 26 and having its anode connected to the ground is turned on, and operates to supply current to the drive coil. Thus, when each diode is turned on, the potentials of the three-phase drive coils U, V, and W become the ground potential as shown in the figure, so that the terminals s1h, s2h, and s3h also become the ground potential, and the buffer function can be maintained. .

  Therefore, even if the motor is decelerated during the second energization period, the three-phase drive coils U, V, and W are not connected to each other through the transistor as in the conventional example. It will not be in a braking state and will not fall into a sudden deceleration state. As a result, there is an excellent effect that noise and vibration are low.

  Various signal processing in this embodiment can be realized by hardware processing using an analog or digital circuit, and software processing may be performed using a microcomputer, a digital signal processor, or the like. Needless to say, it goes without saying that ICs or LSIs may be used.

  The motor of the present invention is driven by a motor driving device, and the motor driving device in the first embodiment of the present invention can be used as the motor driving device. Thereby, the motor of the present invention has an excellent effect that noise and vibration are low. The device of the present invention is equipped with a motor driven by a motor drive device, and the motor drive device in the first embodiment of the present invention can be used as the motor drive device. Thereby, the device of the present invention has an excellent effect that noise and vibration are low.

  3 is a circuit configuration diagram of a motor driving device including a wide-angle energization signal generator, FIG. 4 is an operation explanatory diagram of the wide-angle energization signal generator in the motor driving device shown in FIG. 3, and FIG. 5 is a motor driving device shown in FIG. FIG. 6 is a diagram illustrating a state in which the overlap period detection signal OL is output, FIG. 6 is a diagram illustrating a power supply waveform to each phase coil terminal in the motor driving device illustrated in FIG. 3, and FIG. 7 is a motor driving device illustrated in FIG. FIG. 8 is a circuit configuration diagram of a motor driving device according to a second embodiment of the present invention, and FIGS. 9A and 9B are explanatory diagrams of the operation of the motor driving device shown in FIG. It is.

  First, prior to the description of the motor driving apparatus according to the second embodiment of the present invention, a motor driving apparatus including a wide-angle energization signal generator will be described with reference to FIGS.

  Here, a case will be described in which the energization of the three-phase drive coils is a wide-angle energization waveform with an electrical angle of 150 ° in the first and second energization periods.

  In FIG. 3, the three-phase drive coils, that is, the U-phase coil 11, the V-phase coil 13, and the W-phase coil 15 are connected to the energizer 220 as follows.

  In the energizer 220, an upper arm is constituted by three field effect transistors (FETs) 221, 223 and 225, and a lower arm is constituted by transistors 222, 224 and 226. A first terminal of the U-phase coil 11 is connected to a connection point between the transistors 221 and 222. A first terminal of the V-phase coil 13 is connected to a connection point between the transistors 223 and 224. A first terminal of W-phase coil 15 is connected to a connection point of transistors 225 and 226. The second terminals of these three-phase coils are connected to each other to form a neutral point N.

  A DC power supply (not shown) applies the output voltage Vdc to the energizer 220 and supplies power to the three-phase coil via the energizer 220.

  The position detectors 101, 103, and 105 are configured by Hall elements or Hall ICs, etc., and will be described as motor movers (not shown. A rotor for a rotary motion motor, a mover for a linear motion motor, and a rotor hereinafter. .) Is detected with respect to each phase coil 11, 13 and 15. The wide-angle energization signal generator 290 receives the position detection signals Hu, Hv, and Hw from the detectors 101, 103, and 105, and outputs signals UH0, UL0, VH0, VL0, WH0, and WL0. These signals UH0, UL0, VH0, VL0, WH0, and WL0 are signals that are at “H” level for an electrical angle of 150 degrees as shown in FIG. These signals are configured so that the transistors 221, 222, 223, 224, 225, and 226 constituting the energizer 220 are turned on when the signal is at “H” level, and turned off when the signal is at “L” level. Yes. Further, the signal UH0 and the signal UL0 share the “L” level section of the electrical angle of 30 degrees, and have a relationship of being “H” level complementary to the electrical angle of 150 degrees. The same applies to the relationship between the signal VH0 and the signal VL0 and the relationship between the signal WH0 and the signal WL0. Further, the signals UH0, VH0, and WH0 have a phase difference of 120 electrical degrees. Similarly, the signals UL0, VL0, WL0 have a phase difference of 120 degrees in electrical angle.

  The pulse width modulator (PWM modulator) 240 includes AND gates 241, 243 and 245. Signals UH0, VH0, and WH0 are input to the first input terminals of the gates 241, 243, and 245, respectively. The second input terminals of the gates 241, 243, and 245 are connected in common to each other and to the output of the comparator 250. The comparator 250 compares the voltage of the signal L0 output based on the speed command signal S output from the speed setter 260 with the triangular wave signal CY that is the output of the triangular wave oscillator 247. The signal CY is a so-called carrier signal in pulse width modulation. The frequency of the signal CY is about several kHz to several hundred kHz, and is set considerably higher than the frequency of the signal S or the signal L0.

  Here, the signal L0 is a signal obtained by selecting one of the first value L1 and the second value L2 obtained based on the signal S from the speed setter 260 by the selector 280. is there. The selection is determined by the overlap period detection signal OL output from the wide-angle energization signal generator 290.

  Further, the first value L1 is obtained by dividing the signal S by the level setter 270 including the resistor 271 and the resistor 272. The second value L2 is obtained from the value of the signal S itself. Here, the values of the resistor 271 and the resistor 272 are set such that the ratio of the first value L1 and the second value L2 is sin (π / 3): 1 (approximately 0.866: 1). .

  The gate driver 230 includes buffers 231, 232, 233, 234, 235 and 236. The output signals G1H, G2H, and G3H of the gates 241, 243, and 245 are input to the buffers 231, 233, and 235, respectively. Signals UL0, VL0, WL0 from the wide-angle energization signal generator 290 are input to the buffers 232, 234, 236, respectively. The outputs of the buffers 231, 232, 233, 234, 235 and 236 are input to the gates of the transistors 221, 222, 223, 224, 225 and 226, respectively.

  Each of the above-described constituent elements 220, 230, 240, 290, 101, 103 and 105 constitutes a wide-angle energizer 201. In addition, each of the components 247, 250, 260, 270, and 280 constitutes an energization amount controller 202.

  The operation of the driving apparatus of the second embodiment configured as described above will be described with reference to FIGS.

  FIG. 4 is a diagram for explaining the operation of the wide-angle energization signal generator 290.

  The output signals UH0, UL0, VH0, VL0, WH0, and WL0 of the wide-angle energization signal generator 290 are signals that take the “H” level for an electrical angle of 150 degrees as shown in FIG. These signals are generated based on the position detection signals Hu, Hv, and Hw output from the position detectors 101, 103, and 105.

  In general, the signals Hu, Hv, and Hw are signals having a phase difference of an electrical angle of 120 degrees, and even if these signals are directly logically synthesized, a signal that is at “H” level for 150 degrees cannot be generated. . However, for example, an electrical interpolation process such as measuring one period of at least one signal (for example, signal Hu) out of the signals Hu, Hv, and Hw and dividing the one period by an electrical angle of 15 degrees is performed. The obtained signal Hcl can be obtained. The signal Hcl can be used to generate signals UH0, UL0, VH0, VL0, WH0, and WL0 that are at the “H” level for an electrical angle of 150 degrees. FIG. 4 shows the operation time chart.

  Of course, it is also possible to use one cycle of a synthesized signal having a higher frequency obtained by synthesizing all the signals Hu, Hv, and Hw and synthesizing these signals. However, in consideration of the absolute or relative mounting accuracy of the detectors 101, 103, and 105, it is more practical to use one of the signals Hu, Hv, and Hw. Further, the division width of one cycle does not necessarily need to be in increments of 15 degrees, and may be further subdivided. In the second embodiment, a signal Hcl obtained by subjecting the signal Hu to electrical interpolation processing by dividing the signal Hu by 15 degrees is used.

  When the motor 10 is driven by the signals UH0, UL0, VH0, VL0, WH0, and WL0 generated by the time chart shown in FIG. 4, the phase coil terminals U, V, and W of the motor 10 are as shown in FIG. Power supply (voltage application) is performed in an energization cycle having a phase difference of 120 degrees in electrical angle and energization of 150 degrees in electrical angle and 30 degrees in rest.

  When such power supply is performed, the overlapping period in which adjacent phase coil terminals are in the same power supply state (both positive direction energization or both negative direction energization) has an electrical angle of 30 degrees and a phase difference of 30 degrees. It occurs sequentially at intervals. The overlap period detection signal OL is a signal that is at the “H” level during the overlap period, as shown in FIG.

  In the second embodiment, when the signal OL is at the “H” level, the signal S of the speed setter 260 is changed to sin (π / 3) (approximately 0 by the action of the level setter 270 and the selector 280. .866) The first value L1 multiplied by 2 is set as the signal L0, and PWM modulation based on the value L1 is performed. During the period other than the overlap period, the signal OL is at the “L” level. At this time, the second value L2, which is the signal S itself, is set as the signal L0, and PWM modulation based on the value L2 is performed.

  As a result, as shown in FIG. 6, the power supply waveform to each phase coil terminal U, V and W of the motor 10 is slightly smaller than the non-overlapping period in the energizing period 150 degrees during the overlapping period ( sin (π / 3) is approximately 0.866 times).

  When the coil terminals U, V and W are driven by such a power supply waveform, a waveform N shown in FIG. 7 appears at the neutral point N of each phase coil 11, 13 and 15. At this time, each phase coil 11, 13 and 15 is supplied with power according to the voltage difference between the coil terminals U, V and W and the neutral point N. For example, in the case of the U-phase coil 11, Power is supplied by the waveform indicated by signal UN in FIG.

  This signal U-N is “− (2/3) × sin (π / 3)”, “− (1/2)”, “− (1/3) × sin (π / 3)”, “0”. (Non-energized) ”,“ (1/3) × sin (π / 3) ”,“ (1/2) ”,“ (2/3) × sin (π / 3) ”are stepped. It is a waveform to take. It can be seen that these values are values (approximate values) on a sinusoidal waveform signal (“(1 / √3) · sin θ”, where θ = nπ / 6, n is an integer).

  The signal U-N becomes a stepped waveform on the waveform signal of the sine wave. The first value L1 set to the ratio of “sin (π / 3): 1” and the second value The selection with the value L2 is nothing but switching between the above-described overlap period detection signals OL to supply power to each phase coil.

  The V-phase coil 13 and the W-phase coil 15 are also the same as the U-phase coil 11, and although not particularly shown, the signal V-N and the signal W-N are also stepped on the waveform signal of a sine wave. It becomes a waveform.

  When each phase coil is driven with such a power supply waveform, low torque ripple driving substantially comparable to sinusoidal driving becomes possible.

  The wide-angle energization signal generator 290 generates energization waveform signals UH0, UL0, VH0, VL0, WH0, and WL0 using the signals Hu, Hv, and Hw according to the time chart shown in FIG. By inputting these signals UH0, UL0, VH0, VL0, WH0, and WL0 to the energizer 220 via the pulse width modulator 240 and the gate driver 230, the motor 10 is driven.

  Now, based on the motor drive apparatus including the above-described wide-angle energization signal generator, a motor drive apparatus in the second embodiment of the present invention will be described.

  FIG. 8 is a circuit configuration diagram of a motor driving device according to the second embodiment of the present invention. One of the differences between the motor driving apparatus of the second embodiment and the motor driving apparatus shown in FIG. 3 is the configuration of the pulse width modulator. The configuration of the pulse width modulator 248 in the motor driving apparatus of the second embodiment shown in FIG. 8 is as follows.

  The pulse width modulator 248 includes AND gates 241, 243 and 245 and AND gates 242, 244 and 246 which are one-side inverter inputs. Signals UH0, VH0, and WH0 are input to one input terminals of the gates 241, 243, and 245, respectively. The other input terminals of the gates 241, 243 and 245 are connected in common and connected to the output terminal of the comparator 250. Signals UL0, VL0, and WL0 are input to one input terminals of the AND gates 242, 244, and 246, respectively. The output terminals of the gates 241, 243 and 245 are connected to the inverter input terminal which is the other input terminal of the AND gates 242, 244 and 246, respectively.

  The gate driver 230 includes buffers 231, 232, 233, 234, 235 and 236. The output signals G1H, G2H, and G3H of the gates 241, 243, and 245 are input to the buffers 231, 233, and 235, respectively. The buffers 232, 234, and 236 receive the output signals G1L, G2L, and G3L of the gates 242, 244, and 246, respectively.

Another difference of the motor driving apparatus of the second embodiment from the motor driving apparatus shown in FIG. 3 is as follows. The output signal OL1 of the rotation speed detector 270 is input to the wide-angle energization signal generator 290. The detector 270 detects the number of rotations during motor rotation. The wide-angle energization signal generator 290 has a function of recognizing a set rotational speed that is a boundary between the first energization period and the second energization period. The wide-angle energization signal generator 290 outputs a signal waveform that is different from that in the first energization period or the second energization period. That is, the output signals UHO, ULO, VHO, VLO, WHO, and WLO output the waveform shown in FIG. 9A during the first energization period and the waveform shown in FIG. 9B during the second energization period.

  Other configurations are the same as the circuit configuration shown in FIG.

  The operation of the motor driving apparatus of the second embodiment configured as described above will be described with reference to FIGS. 9A and 9B. 9A and 9B are explanatory diagrams of the operation of the energization controller 200. FIG.

  First, the time chart of FIG. 9A shows a first energization period from a stop state to a predetermined set rotational speed in motor driving. In FIG. 9A, paying attention to the energization period with an electrical angle of 150 °, the transistors 221, 222, 223, 224, 225, and 226 in the energizer 220 are turned on or off. Accordingly, the drive coil terminals U, V, and W are controlled so as to have either the power supply voltage or the ground potential.

  This will be described in more detail. When the signal G1H is at “H” level, the signal g1h via the buffer 231 is also at “H” level. At that time, the signal G1L is at the “L” level, and the signal g1L via the buffer 232 is also at the “L” level. In this state, the transistor 221 is turned on, the transistor 222 is turned off, and the drive coil terminal U becomes substantially equal to the potential of the power supply voltage Vdc. In practice, the drive coil terminal U has a potential obtained by subtracting a voltage drop corresponding to the ON voltage between the source and drain of the transistor 221 from the power supply voltage Vdc. The on-voltage between the source and drain is a value that is negligibly smaller than the power supply voltage Vdc. (The same applies to the drive coil terminal V and the drive coil terminal W) Therefore, in the claims of the present invention, the expression “each coil potential is set to the potential of the power supply voltage” is used.

  Conversely, when the signal G1H is at "L" level, the signal g1h via the buffer 231 is also at "L" level. At that time, the signal G1L is at the “H” level, and the signal g1L via the buffer 232 is also at the “H” level. In this state, the transistor 221 is turned off, the transistor 222 is turned on, and the drive coil terminal U is substantially equal to the ground potential. Actually, the drive coil terminal U has a potential obtained by adding the on-voltage between the source and drain of the transistor 22 to the ground potential. The on-voltage between the source and drain is a value that is negligibly smaller than the power supply voltage Vdc. (The same applies to the drive coil terminal V and the drive coil terminal W) Accordingly, in the claims of the present invention, the expression “each coil terminal U is set to the ground potential” is used.

  Similarly, when the signal G2H is at “H” level, the signal g2h via the buffer 233 is also at “H” level. At this time, the signal G2L is at the “L” level, and the signal g2L via the buffer 234 is also at the “L” level. In this state, the transistor 223 is turned on, the transistor 224 is turned off, and the drive coil terminal V becomes substantially equal to the potential of the power supply voltage Vdc. Conversely, when the signal G2H is at "L" level, the signal g2h via the buffer 233 is also at "L" level. At that time, the signal G2L is at the “H” level, and the signal g2L via the buffer 234 is also at the “H” level. In this state, the transistor 223 is turned off, the transistor 224 is turned on, and the drive coil terminal V becomes substantially equal to the ground potential.

  Similarly, when the signal G3H is at “H” level, the signal g3h via the buffer 235 is also at “H” level. At this time, the signal G3L is at the “L” level, and the signal g3L via the buffer 236 is also at the “L” level. In this state, the transistor 225 is turned on, the transistor 226 is turned off, and the drive coil terminal W becomes substantially equal to the potential of the power supply voltage Vdc. Conversely, when the signal G3H is at "L" level, the signal g3h via the buffer 235 is also at "L" level. At that time, the signal G3L is at the “H” level, and the signal g3L via the buffer 236 is also at the “H” level. In this state, the transistor 225 is turned off and the transistor 226 is turned on, so that the drive coil terminal W becomes substantially equal to the ground potential.

  As is apparent from the above, the outputs of the buffers 232, 234, and 236 correspond to the "L" level and the "L" level corresponding to the output of the buffers 231, 233, and 235 repeating the change between the "H" level and the "L" level. Repeat the change of the “H” level. Thus, since the transistors 222, 224, and 226 are periodically turned on, the terminals s1h, s2h, and s3h become the ground potential, and the buffer function is maintained.

  Next, in the second energization period that is driven exceeding the above-mentioned predetermined set rotational speed, the energization controller 200 includes the three-phase drive coil terminals U, V, and W of the motor 10 as shown in FIG. 9B. In contrast, power supply control as shown in FIG.

  That is, the signals G1H, G1L, G2H, G2L, G3H, and G3L are connected to the corresponding transistors 221, 222, 223, 224, and 225 through the buffers 231, 232, 233, 234, 235, and 236, respectively. 226. When attention is paid to the energization period with an electrical angle of 150 °, the transistors 221, 223, 225 in the energizer 220 are turned on or off, and the transistors 222, 224, 226 in the energizer 220 are turned off. The terminals U, V, and W are controlled to be substantially equal to or open to the potential of the power supply voltage.

  This will be described in more detail. When the signal G1H is at “H” level, the signal g1h via the buffer 231 is also at “H” level. At that time, the signal G1L is at the “L” level, and the signal g1L via the buffer 232 is also at the “L” level. In this state, the transistor 221 is turned on, the transistor 222 is turned off, and the drive coil terminal U becomes substantially equal to the potential of the power supply voltage Vdc. On the other hand, when the signal G1H is at the “L” level, the signal g1h via the buffer 231 is also at the “L” level. At that time, the signal G1L maintains the “L” level, and the signal g1L via the buffer 232 also maintains the “L” level. In this state, both the transistor 221 and the transistor 222 are turned off, and the drive coil terminal U is opened.

  Similarly, when the signal G2H is at “H” level, the signal g2h via the buffer 233 is also at “H” level. At this time, the signal G2L is at the “L” level, and the signal g2L via the buffer 234 is also at the “L” level. In this state, the transistor 223 is turned on, the transistor 224 is turned off, and the drive coil terminal V becomes substantially equal to the potential of the power supply voltage Vdc. On the other hand, when the signal G2H is at “L” level, the signal g2h via the buffer 233 is also at “L” level. At that time, the signal G2L maintains the “L” level, and the signal g2L via the buffer 234 also maintains the “L” level. In this state, both the transistor 223 and the transistor 224 are turned off, and the drive coil terminal V is opened.

  Similarly, when the signal G3H is at “H” level, the signal g3h via the buffer 235 is also at “H” level. At this time, the signal G3L is at the “L” level, and the signal g3L via the buffer 236 is also at the “L” level. In this state, is the transistor 225 turned on, the transistor 226 turned off, and does the drive coil terminal W become substantially equal to the potential of the power supply voltage Vdc? On the other hand, when the signal G3H is at "L" level, the signal g3h via the buffer 235 is also at "L" level. At that time, the signal G3L maintains the “L” level, and the signal g3L via the buffer 236 also maintains the “L” level. In this state, both the transistor 225 and the transistor 226 are turned off, and the drive coil terminal W is opened.

  9A and 9B, since the horizontal axis is represented by an electrical angle, the lengths of the 150 ° energization period in the first energization period and the second energization period are the same. However, since the driving speed is higher in the second energization period than in the first energization period, the 150 ° energization period of the second energization period is shorter than that of the first energization period in terms of time. Therefore, in the second energization period, the function of the buffer can be held by the periodic transistor ON signals G1L, G2L, and G3L as shown in FIG. Further, even if s1h, s2h, and s3h are not forcibly set to the ground potential as in the prior art, the potentials of the three-phase drive coils U, V, and W are changed to the ground potential as shown in FIG. Therefore, the terminals s1h, s2h, and s3h are also at the ground potential, and the buffer function can be maintained. This is the same as in the first embodiment.

  In the second energization period, even if the motor is decelerated, the three-phase drive coils U, V, and W are not connected to each other via a transistor as in the conventional example. It does not become a state and sudden deceleration does not occur. As a result, there is an excellent effect that noise and vibration are low.

  Various signal processing in this embodiment can be realized by hardware processing using an analog or digital circuit, and software processing may be performed using a microcomputer, a digital signal processor, or the like. Needless to say, it goes without saying that ICs or LSIs may be used.

  The motor of the present invention is driven by a motor driving device, and the motor driving device in the second embodiment of the present invention can be used as the motor driving device. Thereby, the motor of the present invention has an excellent effect that noise and vibration are low. The device of the present invention is equipped with a motor driven by a motor driving device, and the motor driving device in the second embodiment of the present invention can be used as the motor driving device. Thereby, the device of the present invention has an excellent effect that noise and vibration are low.

As described above, in the first embodiment, the first and second energization periods are rectangular wave energization waveforms with an electrical angle of 120 °, and in the second embodiment, the first and second energization periods are. The case where the period is a wide-angle energization waveform with an electrical angle of 150 ° has been described. Further, in the voltage waveform applied first and second weld period, the energization angle is 120 ° in electrical angle or more, be any conduction angle of 180 ° or less, similar to the first and second embodiments Effect Is obtained.

  In the second embodiment, the first and second energization periods are wide-angle energization waveforms, but either the first energization period or the second energization period is a wide-angle energization waveform, and the remaining periods. The same effect can be expected even when is an electric angle 120 ° conduction waveform. For example, the motor drive device according to the present invention configured to drive with a rectangular wave energization waveform with an electrical angle of 120 ° in the first energization period and with a wide angle energization waveform with an electrical angle of 150 ° in the second energization period, When comprehensively considering vibration reduction, motor efficiency, etc., it can be said to be one of the preferred embodiments suitable for practical use.

  FIG. 10A to FIG. 16 show the structure of the device according to the third embodiment of the present invention, taking up a specific device.

  10A and 10B are configuration diagrams showing the structure of the air conditioner. FIG. 10A is a schematic diagram of an air conditioner indoor unit, in which a motor 301 for rotating a blown cross flow fan is mounted. The motor 301 is configured to be driven by the motor driving device of the first or second embodiment. Thereby, a quiet air conditioner indoor unit with less noise and vibration can be provided.

  FIG. 10B is a schematic view of the air conditioner outdoor unit, and a motor 302 for rotating the blower fan is mounted. The motor 302 is configured to be driven by the motor driving device of the first or second embodiment. Thereby, a quiet air conditioner outdoor unit with less noise and vibration can be provided.

  FIG. 11 is a block diagram showing the structure of the water heater, and a motor 303 with a fan for blowing air necessary for combustion is mounted. The motor 303 is configured to be driven by the motor driving device of the first or second embodiment. Thereby, a quiet water heater with less noise and vibration can be provided.

  FIG. 12 is a configuration diagram showing the structure of the air purifier, in which a motor 304 to which a fan for circulating air is attached is mounted. The motor 304 is configured to be driven by the motor driving device of the first or second embodiment. Thereby, a quiet air cleaner with less noise and vibration can be provided.

  FIG. 13 is a configuration diagram showing the structure of the printer, and a motor 305 is mounted for paper feeding. The motor 305 is configured to be driven by the motor driving device of the first or second embodiment. Thereby, a printer with less noise and vibration can be provided.

  FIG. 14 is a block diagram showing the structure of the copying machine, in which a motor 306 is mounted for paper feeding. The motor 306 is configured to be driven by the motor driving device of the first or second embodiment. Thereby, a copying machine with less noise and vibration can be provided.

  FIG. 15 is a configuration diagram showing the structure of an optical media device such as a compact disc, for example, and a spindle motor 307 for rotating the optical media disc is mounted. The motor 307 is configured to be driven by the motor driving device of the first or second embodiment. Thereby, an optical media device with less noise and vibration can be provided.

  FIG. 16 is a block diagram showing the structure of a hard disk device, which is equipped with a spindle motor 308 for rotating the hard disk. The motor 308 is configured to be driven by the motor driving device of the first or second embodiment. Thereby, a hard disk device with less noise and vibration can be provided.

  The present invention is a motor drive device that can realize low vibration and low noise when driving a motor with a simple configuration. Further, the present invention is a motor driven by the motor driving device of the present invention, and can realize low vibration and noise. Further, the present invention is a device equipped with a motor driven by the motor drive device of the present invention, can be used for various devices, and can realize low vibration and noise of the device.

1 is a circuit configuration diagram of a motor drive device according to a first embodiment of the present invention. Operation explanatory diagram of the motor drive device shown in FIG. Circuit diagram of motor drive device including wide-angle energization signal generator Operational explanatory diagram of the wide-angle energization signal generator in the motor drive device shown in FIG. The figure which shows a mode that the overlap period detection signal OL is output in the motor drive device shown in FIG. The motor drive device shown in FIG. 3, the figure which shows the electric power feeding waveform to each phase coil terminal The figure which shows the electric power feeding waveform of each phase coil in the motor drive device shown in FIG. The circuit block diagram of the motor drive device in 2nd Example of this invention (A) And (B) is operation explanatory drawing of the motor drive unit shown in FIG. (A) And (B) is a block diagram which shows the structure of the apparatus (air-conditioning apparatus) in the 3rd Example of this invention. The block diagram which shows the structure of the apparatus (water heater) in 3rd Example of this invention. The block diagram which shows the structure of the apparatus (air cleaner) in 3rd Example of this invention. The block diagram which shows the structure of the apparatus (printer) in 3rd Example of this invention. The block diagram which shows the structure of the apparatus (copier) in 3rd Example of this invention The block diagram which shows the structure of the apparatus (optical media apparatus) in 3rd Example of this invention The block diagram which shows the structure of the apparatus (hard disk apparatus) in 3rd Example of this invention. Circuit diagram of conventional motor drive device Operation explanatory diagram of the motor drive device shown in FIG.

11 U-phase drive coil 13 V-phase drive coil 15 W-phase drive coil 20 Energizer 70 Speed detector 90 Energization controller

Claims (12)

(A) a motor having a three-phase drive coil;
(B) an energizer for energizing the drive coil;
(C) having a configuration including an energization controller for controlling an energization method performed by the energizer on the drive coil;
The energization controller has a configuration including a position detector, a rotation speed detector, an energization signal generator, a pulse width modulator, and a gate driver.
Furthermore, a triangular wave signal and a speed command signal are provided, and a comparator that compares the voltage between the triangular wave signal and the speed command signal is provided.
The energizer includes an upper arm transistor and a lower arm transistor connected to a first terminal of the drive coil, and a connection point between the upper arm transistor and the lower arm transistor and a first of the drive coil. A second terminal of the drive coil is connected to a neutral point of the motor,
In the energization signal generator, a position detection signal from the position detector and an energization period detection signal from the rotation speed detector are input, and an energization waveform signal is output from the energization signal generator,
The pulse width modulator is connected to the energization waveform signal and connected to the output terminal of the comparator,
The energization waveform signal has a configuration in which the drive coil is energized by being input to the energizer via the pulse width modulator and the gate driver,
The energization signal generator outputs a first energization waveform signal and a second energization waveform signal based on the energization period detection signal output from the detector, and outputs a first energization waveform signal from a motor stop state to a predetermined set rotational speed. The first energization waveform signal is output during one energization period, and the second energization waveform signal is output during the second energization period driven exceeding the set rotational speed,
In the first energization period, control of each coil potential in the energization period in which a voltage is applied to the drive coil based on the first energization waveform signal is performed when the transistor of the upper arm in the energizer is turned on. it turns off the transistors of the lower arm, also possible to turn on the transistors of the lower arm in the off transistors of the upper arm Conversely, by repeating the capital, the potential of the power supply voltage the coils potential it and, to repeat and that the potential of the ground the respective coils potential,
In the second energization period, the coil potential in the energization period in which a voltage is applied to the drive coil based on the second energization waveform signal is set to be lower when the transistor of the upper arm in the energizer is turned on. and that the potential of the power supply voltage to turn off the transistors of the arm, configured to control so as to repeat the opening the off to the drive coil the transistors of the lower arm in the off transistors of the upper arm A motor drive device comprising: The motor drive device according to claim 1, wherein at least one energization angle in the first energization period or the second energization period is an arbitrary energization angle of 120 ° to 180 ° in electrical angle. 2. The motor drive device according to claim 1, further comprising a wide-angle energizer for energizing the drive coil with an electrical angle of 150 °, wherein the wide-angle energizer is adjacent to the drive coil. A configuration in which an overlapping period in which the coils are in the same energized state can be detected, and the energization controller sets the magnitude of energization to the drive coil to a first value during the overlapping period, and other than the overlapping period A motor drive device comprising a configuration in which the magnitude of the energization is a second value during the period. 4. The motor driving apparatus according to claim 3, wherein a ratio between the first value and the second value is sin (π / 3): 1.   A motor comprising the motor driving device according to claim 1. The motor according to claim 5, wherein at least one energization angle in the first energization period or the second energization period is an arbitrary energization angle of 120 ° to 180 ° in electrical angle. 6. The motor according to claim 5, further comprising a wide-angle energizer for energizing the drive coil with an electrical angle of 150 °, wherein the wide-angle energizer includes adjacent drive coils among the drive coils. It has a configuration capable of detecting an overlapping period in which the same energized state is detected, and the energization controller sets a magnitude of energization to the drive coil as a first value during the overlapping period, and during a period other than the overlapping period A motor having a configuration in which the magnitude of the energization is a second value.   The motor according to claim 7, wherein a ratio of the first value to the second value is sin (π / 3): 1. A device on which the motor driving device according to claim 1 is mounted. The device according to claim 9, wherein at least one energization angle in the first energization period or the second energization period is an arbitrary energization angle of 120 ° or more and 180 ° or less in terms of electrical angle. The apparatus according to claim 9, further comprising a wide-angle energizer for energizing the drive coil with an electrical angle of 150 °, wherein the wide-angle energizer includes adjacent drive coils among the drive coils. It has a configuration capable of detecting an overlapping period in which the same energized state is detected, and the energization controller sets a magnitude of energization to the drive coil as a first value during the overlapping period, and during a period other than the overlapping period A device in which the magnitude of the energization is a second value. 12. The device according to claim 11, wherein a ratio of the first value and the second value is sin (π / 3): 1.

Images