JP2008154385A - Motor drive device - Google Patents

Abstract

To provide a motor drive device that realizes sinusoidal drive capable of reducing torque ripple and vibration noise during motor drive with high efficiency, and is excellent in stability performance of drive speed.
A waveform generator that generates a waveform signal for driving a motor in a sine wave, an inverter that applies a drive voltage based on the waveform signal to a drive winding, and an advance angle of the drive voltage with respect to an induced voltage of the drive winding The advance angle setter is capable of setting a plurality of advance angle values, and the phase of the sinusoidal drive current flowing in the drive winding is the phase of the induced voltage of the drive winding. Is selected and set from among a plurality of advance values.
[Selection] Figure 1

Description

  The present invention relates to a motor drive device suitable for driving a brushless DC motor used in information equipment such as an air conditioner, a hot water heater equipped with a combustion fan motor, an air purifier, a copying machine, and a printer. In particular, high-speed sine wave drive with excellent speed stability performance when driving the motor, which can greatly reduce torque ripple, vibration, and noise, and high-efficiency built-in or integrated into the motor, used by higher-level equipment It is related with provision of the motor drive device which is easy to do.

  For example, various drive motors used in electrical equipment such as air conditioners, water heaters, air purifiers, copiers and printers are brushless DC motors, taking advantage of long life, high reliability and ease of speed control. (Hereinafter referred to as a motor) is often used.

  Conventionally, as a motor driving method, a rectangular wave driving method for driving a motor driving winding with a rectangular wave driving waveform has been widely adopted. In recent years, however, there has been an increasing demand for driving motors with lower torque ripple, lower vibration and lower noise. As a driving technique that meets this requirement, a sine wave driving system that drives a motor driving winding with a sine wave driving waveform is becoming common.

  As a conventional technique for driving a motor in a sine wave, there is one described in Japanese Patent Publication No. 3322467, for example. In this prior art, sinusoidal waveform data stored in memory according to the rotational position of the motor are sequentially read out. Then, the waveform data is subjected to pulse width modulation, and the motor is driven in a sine wave by controlling each switch element of the inverter circuit for supplying power to the drive winding of the motor.

  Moreover, there exists a thing as described in Unexamined-Japanese-Patent No. 2003-348874. In this conventional technique, a sine wave driving technique is realized by a semiconductor integrated circuit, and the number of parts used and the cost are reduced.

Further, there is one described in Japanese Patent Publication No. 3500368. In this prior art,
The motor is driven with high efficiency by constantly performing phase correction between the induced voltage of the motor and the drive voltage in accordance with the rotational speed and load torque of the motor.

  FIG. 8 is a circuit configuration diagram of this type of prior art motor driving device, and FIG. 9 is an operation explanatory diagram of the motor driving device shown in FIG.

  In FIG. 8, motor 501 has U-phase drive winding 511, V-phase drive winding 513 and W-phase drive winding 515. Drive power is supplied from the DC power supply 505 to the drive windings 511, 513 and 515 via the inverter 520.

  Inverter 520 includes positive switches 521, 523, and 525 that connect drive windings 511, 513, and 515 of motor 501 to positive power supply line 501. The inverter 520 includes negative switches 522, 524, and 526 that connect the drive windings 511, 513, and 515 of the motor 501 to the negative power supply line 502.

  The controller 530 includes a waveform generator 531 and a pulse width modulator 532.

The speed controller 540 outputs a control signal VSP to the pulse width modulator 532 in accordance with the motor drive speed command signal Sref from the host unit 506. Further, the gain of the speed controller 540 is switched according to the speed switching signal HL from the host unit 506.

  The motor driving device 500 includes an inverter 520, a controller 530, and a speed controller 540.

  A sinusoidal waveform signal WF generated by the waveform generator 531 according to the rotational position signal CS of the motor 501 is input to the pulse width modulator 532. The pulse width modulator 532 outputs the pulse width modulated control signals UH, VH, WH, UL, VL, and WL to the switch elements 521 to 526 of the inverter 520 based on the sinusoidal waveform signal WF. Each switch element 521 to 526 is turned on or off by control signals UH, VH, WH, UL, VL and WL, respectively.

  Here, the control signals UH, VH and WH are signals output from the pulse width modulator 532 with a phase difference of 120 electrical degrees. The control signals UL, VL, WL are also signals output from the pulse width modulator 532 with a phase difference of 120 electrical degrees.

  Here, the operation for the U-phase drive winding 511 connected to the output U of the inverter 520 among the drive windings of the motor 501 will be described with reference to FIG.

  In FIG. 9, a triangular wave signal CY is a PWM carrier signal present inside the pulse width modulator 532.

  A sinusoidal waveform signal WF generated by the waveform generation means 531 according to the rotational position signal CS of the motor 501 is compared with the carrier signal CY by the pulse width modulator 532. Depending on the comparison result, switch elements 521 and 522 of inverter 520 are turned on and off in a complementary manner. As a result, the drive voltage U shown in FIG. 9 is output from the inverter 520 and applied to the U-phase drive winding 511. A U-phase drive current Iu flows through the U-phase drive winding 511.

  The drive voltage U is a voltage that alternately changes between the positive side voltage and the negative side voltage of the DC power supply 505 instantaneously, but the average value corresponds to the waveform signal WF from the principle of pulse width modulation. It becomes a sinusoidal voltage. Therefore, the U-phase drive winding 511 is applied with a sinusoidal voltage similar to the U-phase waveform signal WF.

  Similarly to the U-phase drive winding 511, sinusoidal voltages are applied to the V-phase drive winding 513 and the W-phase drive winding 515 by the drive voltage V and the drive voltage W, respectively.

  Here, the drive voltages U, V and W applied to the respective phase drive windings 511, 513 and 515 have a phase difference of an electrical angle of 120 degrees. That is, with respect to the V-phase drive winding 513, an inverter is selected according to the comparison result between the U-phase waveform signal WF and the sinusoidal V-phase waveform signal having a phase difference of 120 degrees and the carrier signal CY. 520 switch elements 523 and 524 are complementarily turned on and off.

  For the W-phase drive winding 515, a comparison result between the U-phase waveform signal and the V-phase waveform signal and the carrier signal CY is a sinusoidal W-phase waveform signal having a phase difference of 120 degrees from each other. Accordingly, switch elements 525 and 526 of inverter 520 are complementarily turned on and off.

As described above, sinusoidal voltages are applied to the respective phase drive windings 511, 513, and 515, and the motor 501 is sinusoidally driven.

  Here, the host device 506 is constituted by, for example, a microcomputer, a DSP, a PLD, an FPGA, or the like.

  The host unit 506 outputs a command signal Sref for determining the driving speed of the motor to the speed controller 540, and the speed controller 540 determines a difference (speed deviation) between the actual driving speed of the motor and the speed indicated by the command signal Sref. The gain is multiplied, and the control signal VSP is output to the pulse width modulator 532 so that the speed deviation is small or zero. The pulse width modulator 532 applies a sine wave drive voltage having a magnitude (crest value) corresponding to the control signal VSP to each phase drive winding 511, 513 and 515. Thereby, the speed control of the motor 501 is performed.

  The speed switching signal HL of the host unit 506 is a signal that becomes H level or L level in conjunction with the command signal Sref. For example, when the command signal Sref is a command for a high motor driving speed, the speed switching signal HL is H level and slow motor In the case of a command for the driving speed, the signal is a L level.

  The speed switching signal HL is used as a signal for switching the gain by which the speed deviation is multiplied in the speed controller 540, and optimizes the speed control gain when the motor driving speed is fast and slow, from low speed to high speed. This is to obtain stable speed controllability.

A technique for stabilizing speed controllability by switching such speed gain is disclosed in Japanese Patent Laid-Open No. 6-261576.
Japanese Patent No. 3322467 JP 2003-348874 A Japanese Patent No. 3500348 JP-A-6-261576

  However, the above-described conventional motor driving device 500 has a problem that it is difficult to drive the motor 501 with high efficiency and to stabilize the driving speed.

  In order to drive the motor with high efficiency, it is necessary to match the phase of the drive current flowing in the drive winding with the phase of the induced voltage.

  The drive current flowing in the drive winding is a value obtained by dividing the voltage obtained by subtracting the induced voltage from the drive voltage applied to the drive winding by the impedance of the drive winding. Here, the impedance of the drive winding has an inductance component. For this reason, the phase of the drive current is delayed from the phase of the drive voltage. Therefore, in order to drive the motor with high efficiency, the phase of the drive voltage is advanced so that the phase of the induced voltage and the phase of the drive current match in consideration of the phase delay of the drive current with respect to the drive voltage (so-called advancement). Corner) is required.

  In the motor drive device according to the prior art shown in FIG. 8, the drive voltage applied to each phase drive winding 511, 513 and 515 is sinusoidal, and the speed can be controlled by controlling the magnitude by the control signal VSP. The phase cannot be advanced.

As a result, as shown in FIG. 9, for example, the phase of the induced voltage Uemf of the drive winding 511 and the drive current Iu flowing therethrough cannot be matched, and there is a problem that the drive efficiency of the motor decreases. .

  In order to improve this, Japanese Patent Publication No. 3500368 shown in Cited Document 3 discloses a technique for advancing the phase of the drive voltage in accordance with the actual drive speed and load torque of the motor. However, although this technology can drive the motor with a certain degree of high efficiency, the phase of the driving voltage is constantly corrected by the motor driving speed and load torque, so this correction constantly changes the torque characteristics of the motor. As a result, there is a problem that the driving speed of the motor tends to become unstable.

  In order to solve the above-described problems, a motor drive device according to the present invention is based on a motor having a mover and a drive winding, a waveform generator that generates a waveform signal for driving the motor in a sine wave, and the waveform signal. An inverter that applies a drive voltage to the drive winding; and an advance angle setter that sets an advance value that is a phase advance angle of the drive voltage with respect to an induced voltage of the drive winding; A plurality of advance angle values can be set, and the advance angle setter is set so that the phase of the sinusoidal drive current flowing in the drive winding substantially matches the phase of the induced voltage of the drive winding. One of the plurality of advance values is selected and set.

  The advance angle setting unit is configured to select and set the advance value in accordance with the command value of the motor driving speed.

  Further, a part or all of the waveform generator, the inverter, and the advance angle setting device are formed by a semiconductor integrated circuit, and are built in or integrated with the motor.

  According to the present invention, in addition to driving the motor with a sinusoidal wave with low torque ripple, low noise, and low vibration, high-efficiency driving is realized by roughly matching the phases of the induced voltage and driving current of the drive winding. Further, by selecting and setting one advance value by the advance angle setting device, the torque characteristics are stabilized, and the driving speed of the motor is also stabilized.

  In addition, by selecting and setting the optimum advance value according to the command value of the motor drive speed, it is possible to drive the motor at a high efficiency and a stable speed in a wide speed range from low speed to high speed. Become. This is an advantageous effect for applications in which the motor drive speed is varied over a relatively wide range, such as an enlargement / reduction function such as a printer or PPC, or an air volume adjustment of an air conditioner.

  In addition, a motor drive unit consisting of a waveform generator, inverter, and advance angle setting device is built in or integrated into the motor, making it compact and easy to incorporate into equipment, and high-order equipment with excellent speed stability, low vibration, and low It is possible to easily construct a high-efficiency drive system using a noise sine wave drive motor.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a circuit configuration diagram of a motor drive device according to a first embodiment of the present invention, and FIGS. 2, 3 and 4 are operation explanatory views of the motor drive device shown in FIG.

  In FIG. 1, the motor drive device 100 of the present embodiment includes an inverter 20, a controller 30, a speed controller 40, and an advance angle setter 60.

  The motor drive device 100 is formed on a printed wiring board (not shown), and is built in or integrated with the motor 1 together with a mover (not shown) and drive windings 11, 13 and 15 that constitute the motor 1. The

  The motor driving device 100 includes motor control terminals 10 and 11. A command signal Sref that determines the driving speed of the motor is input from the host device 6 to the control terminal 10, and a speed switching signal HL that operates in conjunction with the command signal Sref is input to the control terminal 11. The host device 6 is provided in a device on which the motor 1 and the motor driving device 100 are mounted, and is constituted by a microcomputer, DSP, PLD, FPGA, or the like.

  The inverter 20 includes positive-side switch elements 21, 23, and 25 that electrically connect multiple-phase (three-phase) drive windings 11, 13, and 15 of the motor 1 to the positive-side power line 101. The inverter 20 includes negative-side switch elements 22, 24, and 26 that electrically connect the multiple-phase drive windings 11, 13, and 15 to the negative-side power supply line 102.

The advance angle setter 60 has advance values PS1 and PS2 having different values therein, and selects and sets one of the advance values by the speed switching signal HL, and sets the phase advance signal PS set here. Output to the controller 30;
The controller 30 includes a waveform generator 31. The waveform generator 31 outputs a ratio signal between the ON period and the OFF period of the positive side or negative side switching elements 21 to 26 as a waveform signal of the drive windings 11, 13, and 15. The phase of the waveform signal is controlled by the phase advance signal PS.

  The controller 30 outputs to the inverter 20 a ratio signal between the ON period and the OFF period of the positive side or negative side switching elements 21 to 26 according to the waveform signal. Thus, in the inverter 20, the positive side and negative side switching elements 21 to 26 of the inverter 20 are turned on or off based on the control signal from the controller 30, and the drive windings 11, 13 and 15 of each phase are sine-wave shaped. Drive with alternating current.

  The configuration of the motor drive apparatus according to the first embodiment will be described in further detail with reference to FIG. In FIG. 1, a DC power source 5 is connected to the motor 1 via an inverter 20. More specifically, the positive power supply line 101 of the DC power supply 5 is connected to the first terminal of the positive switch element 21. The second terminal of the positive switch element 21 is connected to the first terminal of the negative switch element 22. The second terminal of the negative side switch element 22 is connected to the negative side power source line 102 of the DC power source 5. The U-phase drive winding 11 of the motor 1 is connected to a common connection point between the positive side switch element 21 and the negative side switch element 22, that is, a connection point between the second terminal of the positive side switch element 21 and the first terminal of the negative side switch element 22. Are connected at their first ends.

  Similarly, the first terminal of the positive switch element 23 is connected to the positive power supply line 101. The second terminal of the positive switch element 23 is connected to the first terminal of the negative switch element 24. A second terminal of the negative switch element 24 is connected to the negative power supply line 102. The V-phase drive winding 13 of the motor 1 is connected to a common connection point between the positive side switch element 23 and the negative side switch element 24, that is, a connection point between the second terminal of the positive side switch element 23 and the first terminal of the negative side switch element 24. Are connected at their first ends.

  Similarly, the first terminal of the positive switch element 25 is connected to the positive power supply line 101. The second terminal of the positive switch element 25 is connected to the first terminal of the negative switch element 26. A second terminal of the negative switch element 26 is connected to the negative power supply line 102. The W-phase drive winding 15 of the motor 1 is connected to a common connection point between the positive side switch element 25 and the negative side switch element 26, that is, a connection point between the second terminal of the positive side switch element 25 and the first terminal of the negative side switch element 26. Are connected at their first ends.

  The second end of the U-phase drive winding 11, the second end of the V-phase drive winding 13, and the second end of the W-phase drive winding 15 are connected to each other to form a neutral point.

  The controller 30 outputs control signals UH, VH, and WH for turning on or off the positive-side switch elements 21, 23, and 25 to the third terminals of the positive-side switch elements 21, 23, and 25, respectively. To do. Further, the controller 30 sends control signals UL, VL and WL for turning on or off each of the negative side switch elements 22, 24 and 26 to the third terminals of the negative side switch elements 22, 24 and 26, respectively. Output.

  In addition to the waveform generator 31, the controller 30 further includes a pulse width modulator 32. The waveform generator 31 outputs a waveform signal WF to the pulse width modulator 32 so that the drive current waveforms of the drive windings 11, 13 and 15 are approximately sinusoidal.

  The host device 6 outputs a command signal Sref and a switching signal HL. Each of these signals is input to the motor control terminals 10 and 11 of the motor driving apparatus 100 and further input to the speed controller 40. The switching signal HL is also input to the advance angle setting device 60.

  The speed controller 40 outputs a signal obtained by multiplying a difference (speed deviation) between the actual driving speed of the motor and the speed indicated by the command signal Sref by a predetermined gain to the pulse width modulator 32 as a control signal VSP. The gain is controlled by the switching signal HL.

  The pulse width modulator 32 performs pulse width modulation by multiplying the waveform signal WF and the control signal VSP and then comparing them with the carrier signal CY. The result of the pulse width modulation is output to inverter 20 as control signals UH, VH, WH, UL, VL and WL of controller 30.

  The advance angle setting unit 60 selects and sets one of the advance value PS1 and PS2 having different values by the switching signal HL, and sets the advance value set here as the phase advance value. Output as a corner signal PS. The phase advance signal PS is input to the controller 30 and further input to the waveform generator 31.

  The waveform generator 31 advances the phase of the waveform signal WF described above according to the phase advance signal PS and outputs it to the pulse width modulator 32.

  Next, the operation of the motor driving apparatus 100 according to the first embodiment configured as described above will be described.

  FIG. 2 is a diagram for explaining the operation of the motor driving apparatus 100 according to the first embodiment shown in FIG.

  In FIG. 2, a triangular wave signal CY is a PWM carrier signal existing inside the pulse width modulator 32. Usually, the carrier signal CY is set to a frequency sufficiently higher than the electrical angular period due to the rotation of the motor 1, but in FIG. 2, it is shown at a relatively low frequency for convenience of explanation.

  The waveform generator 31 generates a sinusoidal waveform signal WF according to the rotational position of the motor 1. The sinusoidal waveform signal WF is voltage-compared with the carrier signal CY by the pulse width modulator 32, and a pulse width modulation signal (PWM signal) whose pulse width changes according to the waveform signal WF is generated. Then, either the positive side switch element 21 or the negative side switch element 22 of the inverter 20 is turned on or off according to the pulse width modulation signal. As a result, the drive voltage U shown in FIG. 2 is output from the inverter 20 and applied to the U-phase drive winding 11.

  The driving voltage U is a voltage that instantaneously alternates between a positive side voltage and a negative side voltage of the DC power supply 5, but in accordance with the principle of pulse width modulation, the average value depends on the waveform signal WF. A sinusoidal voltage similar to the waveform signal WF is applied to the U-phase drive winding 11.

  In the above description, the U-phase drive winding 11 has been described, but the V-phase drive winding 13 and the W-phase drive winding 15 are also respectively connected to the inverter 20 in the same manner as the U-phase drive winding 11. A sinusoidal voltage is applied by the drive voltage V and the drive voltage W.

  Here, the phase drive voltages U, V, and W applied to the phase drive windings 11, 13, and 15 have a phase difference of an electrical angle of 120 degrees. This corresponds to a comparison result between the U-phase waveform signal WF and the sinusoidal V-phase waveform signal having a phase difference of 120 degrees with respect to the V-phase drive winding 13 and the carrier signal CY. Thus, the switching elements 23 and 24 of the inverter 20 are turned on and off. For the W-phase driving winding 15, a comparison between the U-phase waveform signal and the V-phase waveform signal and the carrier signal CY is a sinusoidal W-phase waveform signal having a phase difference of 120 degrees from each other. Depending on the result, the switching elements 25 and 26 of the inverter 20 are turned on and off.

  As described above, sinusoidal voltages are applied to the drive windings 11, 13 and 15, and the drive windings 11, 13 and 15 are driven by sinusoidal alternating current.

  Here, the operation in which the phase of the sinusoidal voltage applied to each of the drive windings 11, 13 and 15 is controlled by the phase advance signal PS output from the advance angle setting device 60 will be described with reference to FIG. . For convenience of explanation, the U phase will be described, but the same applies to the V phase and the W phase.

  The phase advance signal PS output from the advance angle setter 60 is input to the waveform generator 31. The waveform generator 31 advances the phase of the waveform signal WF generated according to the mover position of the motor 1 according to the phase advance signal PS and outputs it to the pulse width modulator 32.

  Here, in the case of a brushless DC motor, there are a method of using a Hall sensor using the Hall effect, a method of using an induced voltage or a drive winding current generated in the drive winding, etc. .

  The position detection signal CS in FIG. 1 is a signal detected by any one of these methods, and the waveform generator 31 generates the waveform signal WF using the phase based on the signal CS as a reference phase timing. Since the position detection signal CS detects the magnetic pole position of the magnet incorporated in the mover, the phase relationship with the induced voltage generated by the drive winding is uniquely determined. In the present embodiment, as shown in FIG. 3, the reference phase timing is the zero cross timing of the induced voltage Uemf generated in the drive winding 11.

  The waveform generator 31 advances the phase of the waveform signal WF generated according to the reference phase timing in accordance with the phase advance signal PS and outputs it to the pulse width modulator 32. As a result, a sinusoidal drive voltage whose phase can be controlled by the phase advance signal PS can be applied to the U-phase drive winding 11.

The phase advance signal PS enables the motor 1 to be driven with high efficiency. This is because the advance angle setter 60 advances the phase delay caused by the inductance component of the drive winding, that is, the phase delay of the drive current Iu with respect to the average value of the drive voltage U (corresponding to the waveform signal WF). The value, that is, the phase advance signal PS is set, the phase of the waveform signal WF is advanced, and the induced voltage U of the drive winding
This is realized by setting the phase difference between emf and the drive current Iu to approximately zero. This applies not only to the U-phase drive winding 11 described above but also to the V-phase drive winding 13 and the W-phase drive winding 15.

  Further, since the phase advance signal PS set by the advance angle setter 60 is set to a constant advance value PS1 or PS2, the advance value does not constantly change depending on the motor speed or load state. The torque characteristics of the motor are stabilized, and the driving speed is also stabilized.

  On the other hand, the magnitude of the sinusoidal voltage applied to each of the drive windings 11, 13 and 15 is controlled by the control signal VSP input from the speed controller 40. This will also be described with respect to the U phase using FIG. 3, but the same applies to the V phase and the W phase.

  A control signal VSP output from the speed controller 40 is input to the pulse width modulator 32. The pulse width modulator 32 performs pulse width modulation by comparing the magnitude (peak value) of the sinusoidal waveform signal WF output from the waveform generator 31 with the carrier signal CY in correspondence with the control signal VSP. Thereby, a sinusoidal drive voltage whose magnitude can be controlled by the control signal VSP can be applied to the U-phase drive winding 11.

  Here, the contents of the operation explanation so far are organized.

  In response to the waveform signal WF of the waveform generator 31 included in the controller 30, the drive windings 11, 13 and 15 are driven with a sinusoidal alternating current. As a result, the motor can be driven with low torque ripple, low noise, and low vibration.

  Further, the waveform generator 31 advances the phase of the waveform signal WF in accordance with the phase advance signal PS from the advance angle setter 60. As a result, the motor can be driven with high efficiency by appropriately setting the phase advance signal PS so that the phase difference between the induced voltage and the drive current of each drive winding becomes substantially zero. At this time, since the phase advance signal PS is set to a constant advance value PS1 or PS2, the advance value does not constantly change depending on the speed or load state of the motor, and the torque characteristic of the motor is stabilized. The driving speed is also stabilized.

  The pulse width modulator 32 included in the controller 30 performs pulse width modulation by comparing the magnitude (wave height value) of the waveform signal WF with the carrier signal CY in correspondence with the control signal VSP. Thereby, the magnitude of the voltage applied to each drive winding can be controlled in accordance with the control signal VSP, and the speed of the motor can be varied or adjusted.

  The above is the arrangement of the explanation of the operation so far.

  Hereinafter, operations by the command signal Sref and the speed switching signal HL output from the host device 6 to the motor drive device 100 via the control terminals 10 and 11 will be described.

  First, the command signal Sref is a speed command signal for the host device 6 to drive the motor 1 at a desired speed. The command signal Sref is input to the speed controller 40. The speed controller 40 detects a difference between the signal Sref and a speed detection signal of the motor 1 (not shown), that is, a speed deviation, and multiplies the difference by an appropriate gain to output a control signal VSP. At this time, the speed controller 40 adjusts the speed of the motor 1 by adjusting the control signal VSP so that the speed deviation is small or zero. Thereby, the host device 6 can set the speed of the motor 1 to a desired value by operating the command signal Sref.

Next, the speed switching signal HL is a signal that the host unit 6 outputs in conjunction with the command signal Sref, and is a signal whose state changes stepwise according to the set speed of the motor 1 by the command signal Sref. For example, when the command signal Sref is set to drive the motor 1 in the high speed region, the signal is at the H level.

  The speed switching signal HL is input to the speed controller 40 and the advance angle setter 60.

  The speed controller 40 switches the gain by which the above-described speed deviation is multiplied by the switching signal HL, and operates so as to ensure the speed control performance even when the host unit 6 changes the driving speed of the motor 1 by the command signal Sref. To do.

  The advance controller 60 switches the advance value by the switching signal HL, and ensures high-efficiency driving by the sinusoidal alternating current even when the host 6 changes the driving speed of the motor 1 by the command signal Sref. To work.

  This will be described below.

  First, as described above, the speed controller 40 outputs the control signal VSP by multiplying the difference between the command signal Sref and the motor speed detection signal, that is, the speed deviation, by an appropriate gain.

  Here, as is well known, the gain multiplied by the speed deviation needs to be set appropriately in order to stably control the speed of the motor.

  Generally, when the motor speed changes, the load point and the circuit operating point change.

  Therefore, when the driving speed of the motor 1 is changed by the command signal Sref from the host device 6, it is necessary to reset the gain to be multiplied by the speed deviation in order to stably maintain the speed control performance of the motor.

  As described above, the switching signal HL is a signal that is at the H level when the command signal Sref is set to drive the motor 1 in the high speed region, and is at the L level when the command signal Sref is set to drive in the low speed region. . Depending on the output state of the switching signal HL, the speed controller 40 can determine whether the driving speed of the motor 1 to be set by the command signal Sref is a high speed region or a low speed region, and is suitable for each speed region. It can be switched to gain setting. Thereby, even when the driving speed of the motor 1 is changed, the speed control performance of the motor 1 can be maintained.

  On the other hand, the advance angle setter 60 is a phase advance angle for advancing the phase of the waveform signal WF so that the phase of the induced voltage of the drive winding and the drive current are substantially matched and the motor 1 is driven with high efficiency. The signal PS is set.

  Here, as described above, in order to drive the motor 1 efficiently, it is necessary to appropriately set the phase advance signal PS.

  In general, when the motor speed is changed, the impedance, induced voltage, and load due to the inductance component of the drive winding change, and the phase delay state of the drive current with respect to the drive voltage applied to the drive winding changes. . In other words, even if the motor is driven with high efficiency at one speed, a phase difference occurs between the induced voltage of the drive winding and the drive current at another speed, making it impossible to drive with high efficiency.

  Therefore, when the drive speed of the motor 1 is changed by the command signal Sref from the host unit 6, it is necessary to maintain the high-efficiency drive by the sinusoidal alternating current of the motor to reset the phase advance signal PS accordingly. is there.

  As shown in FIG. 1, the advance angle setter 60 has advance values PS1 and PS2 having different values therein, and selects and sets any one of these advance values by the switching signal HL, and the phase advance value is set. It can be output as a corner signal PS.

  Further, as described above, since the driving speed of the motor 1 to be set by the command signal Sref can be determined according to the output state of the switching signal HL, it is determined whether the driving speed is a high speed area or a low speed area. Any one of the angular values PS1 and PS2 can be appropriately selected, and the motor 1 can be driven with high efficiency.

  This will be further described with reference to FIG.

  In FIG. 4, when the motor is driven at high speed, the advance angle setting unit 60 selects and sets the advance value PS1 as the phase advance signal PS by the switching signal HL. When the signal PS is set to the advance value PS1, the drive waveform signal WF is advanced by the phase corresponding to the advance value PS1 by the waveform generator 31, and the phase between the induced voltage Uemf and the drive current Iu is approximately set. Match. The advance value PS1 is set to a predetermined value so that the phases of the induced voltage Uemf and the drive current Iu substantially coincide when the motor is driven at high speed.

  When the motor is driven at a low speed, the advance angle setting device 60 selects and sets the advance value PS2 as the phase advance signal PS by the switching signal HL. When the signal PS is set to the advance value PS2, the drive waveform signal WF is advanced by the phase corresponding to the advance value PS2 by the waveform generator 31, and the phase between the induced voltage Uemf and the drive current Iu is approximately set. Match. The advance value PS2 is set to a predetermined value so that the phases of the induced voltage Uemf and the drive current Iu are substantially matched when the motor is driven at a low speed.

  As described above, even when the motor drive speed is changed by the command signal Sref from the low speed drive to the high speed drive, the advance angle setter 60 appropriately selects and sets the advance angle value at each drive speed to always increase the motor drive speed. Efficient driving can be realized.

  Further, since the advance value set by the advance angle setting device 60 is fixed and set to the advance value PS1 or PS2 in each range of the high speed region and the low speed region of the motor drive speed, the motor speed and load The advance angle value does not constantly change depending on the state of. Accordingly, the torque characteristics are stabilized and the driving speed of the motor is also stabilized.

  Further, by adding the action of the speed controller 40 described above, more accurate speed stable control can be realized.

  In the present embodiment, for simplicity of explanation, the switching signal HL is set to H level when the command signal Sref is set to drive the motor 1 in the high speed region, and conversely, is set to drive in the low speed region. However, the present invention is not limited to this. For example, if the signal Sref is set to be driven in the medium speed region, the M level may be output, and the signal HL is further divided into levels by further dividing the set speed region of the signal Sref. It doesn't matter. Of course, the signal HL need not be 1 bit, and when the set speed region of the signal Sref is finely divided, it may be a logical output of 2 bits or more. With this subdivision, the advance value in the advance angle setting device 60 may be selected not only from PS1 and PS2, but also from a larger number of advance values.

  As described above, in the motor drive device of the present embodiment, each of the drive windings 11, 13 and 15 is driven by a sinusoidal alternating current according to the waveform signal WF of the waveform generator 31 included in the controller 30. The motor can be driven with low torque ripple, low noise, and low vibration. In addition, the phase of the waveform signal WF is advanced in accordance with the phase advance signal PS of the advance angle setter 60, and the motor can be driven with high efficiency by substantially matching the phase difference between the induced voltage and the drive current of each drive winding. . At this time, since the phase advance signal PS is set to a constant advance value PS1 or PS2, the advance value does not constantly change depending on the motor speed or load state, and the torque characteristic of the motor is stabilized. The driving speed is also stabilized.

  Further, even when the host device 6 changes the motor driving speed from the low speed to the high speed by the command signal Sref, the advance angle setting device 60 appropriately selects and sets the advance value at each driving speed by the switching signal HL. This makes it possible to always achieve high-efficiency driving. At this time, the advance value, that is, the phase advance signal PS set by the advance angle setter 60 is fixedly set to the advance value PS1 or PS2 within each range of the high speed region and the low speed region of the motor drive speed. Therefore, the advance value does not constantly change depending on the motor speed and the load state, the torque characteristics of the motor are stabilized, and the driving speed is also stabilized.

  Further, when the host unit 6 changes the driving speed of the motor 1 by the command signal Sref, the speed controller 40 switches the gain multiplied by the speed deviation by the switching signal HL to ensure the speed control performance. By adding the action of the speed controller 40, more accurate speed stable control can be realized.

  Further, by incorporating or integrating the waveform generator 31, the inverter 20 and the advance angle setting device 60 for driving the motor with a sine wave with high efficiency into the motor 1, it is small in size and easy to incorporate into a host device, and is easy to use. . That is, the sine wave drive having excellent speed stability, high efficiency, low torque ripple, low noise, and low vibration is self-contained in the motor drive device 100 built in or integrated in the motor 1. As a result, the motor 1 can freely and precisely control the speed of the motor 1 by high-efficiency sine wave drive only by inputting the command signal Sref and the switching signal HL from the host device 6 to the motor control device 100. And it is possible to easily construct a high-efficiency drive system with excellent speed stability by the sine wave drive motor of the host device.

  Note that the signals Sref and HL input from the host device 6 may be analog voltage signals, PWM (pulse width modulation) signals, frequency signals, logic signals, or communication signals.

  FIG. 5 is an operation waveform diagram of the motor drive device according to the second embodiment of the present invention.

  The average value (corresponding to the waveform signal WF) of the drive voltage U output from the inverter 20 need not be limited to a sinusoidal waveform, and as a result, the first end of each phase drive winding 11, 13 and 15 of the motor 1. If the voltage between each other or the voltage between the first end of each phase drive winding 11, 13 and 15 and the neutral point is sinusoidal, the motor 1 can be sinusoidally driven.

  For example, the waveform voltage WF as shown in FIG. 5 may be subjected to pulse width modulation and the drive voltage U may be output from the inverter 20.

  In this case, a sinusoidal waveform such as the waveform F shown in FIG. 5 is formed between the first end of each phase drive winding 11, 13, and 15 and the neutral point, and the motor is the same as in the first embodiment. Similarly, it is driven by a sine wave.

  Even when the waveform signal WF as shown in FIG. 5 is used, the same effect as that shown in the first embodiment can be obtained.

  FIG. 6 is a circuit configuration diagram of the motor drive device according to the third embodiment of the present invention.

  In FIG. 6, the difference from the first embodiment shown in FIG. 1 is that the command signal Sref, the control terminal 10 and the speed detector 40 from the host unit 6 are eliminated, and instead the control signal VSP and the control terminal 7 are replaced. Provided that the control signal VSP from the host unit 6 is input to the pulse modulator 32 included in the controller 30 via the control terminal 7, and the rest is the first embodiment shown in FIG. It is the same as the circuit block diagram of the motor drive device.

  In the case of the configuration as shown in FIG. 6, since the speed controller 40 is not provided, the motor driving device is further simplified. In this case, strict speed control is not performed unless the servo calculation or the like is performed by the host device 6, but basically the motor drive speed can be set by the control signal VSP from the host device 6 in the same manner as the command signal Sref. By operating the speed switching signal HL in conjunction with the control signal VSP, the same effect as that shown in the first embodiment can be obtained.

  Note that the control signal VSP input from the host unit 6 may be an analog voltage signal, a PWM (pulse width modulation) signal, a frequency signal, a logic signal, or a signal by communication.

  FIG. 7 is a circuit configuration diagram of the motor drive device according to the fourth embodiment of the present invention.

  In FIG. 7, the difference from the third embodiment shown in FIG. 6 is that the speed switching signal HL and the control terminal 11 from the host unit 6 are eliminated, and a new level determination unit 70 is provided. A configuration in which the level determination unit 70 determines whether the signal VSP is a signal for driving the motor in the high speed region or a signal for driving in the low speed region, and the determination signal is input to the advance angle setting unit 60 as the switching signal HL. The rest is the same as the circuit configuration diagram of the motor drive device according to the third embodiment shown in FIG.

  In the case of the configuration shown in FIG. 7, since the switching signal HL is generated inside the motor drive device 100 by the level determination unit 70, the first embodiment and the first embodiment can be obtained without outputting the speed switching signal HL from the host unit 6. The same effect as shown in 3 can be obtained. In this case, it is possible to reduce the control load on the host device 6 and to simplify the interface between the host device 6 and the motor driving device 100.

  In addition to driving the motor with a low torque ripple, low noise, and low vibration, the motor drive device of the present invention can also drive a high efficiency drive by roughly matching the phases of the induced voltage and drive current of the drive winding. Further, by selecting and setting one advance value by the advance angle setting device, the torque characteristics are stabilized and the driving speed of the motor is also stabilized. In addition, by selecting and setting the optimum advance value according to the command value of the motor drive speed, it is possible to drive the motor at a high efficiency and a stable speed in a wide speed range from low speed to high speed. Become. In addition, a motor drive unit consisting of a waveform generator, inverter, and advance angle setting device is built in or integrated into the motor, making it compact and easy to incorporate into equipment, and high-order equipment with excellent speed stability, low vibration, and low It is possible to easily construct a high-efficiency drive system using a noise sine wave drive motor.

  Therefore, low vibration, low noise, and high efficiency are required, and water heaters, air purifiers, refrigerators, washing machines equipped with fan motor drives and combustion fan motors for air conditioners with a wide variable speed range for air volume control. Home appliances such as printers, or printers, PPCs that require low-vibration, low-noise, high-efficiency, wide-variable speed control for enlargement / reduction functions, etc. It is suitable for driving a motor used in a copying machine, a scanner, a fax machine, or a combination of these, or information equipment such as a hard disk or optical media equipment.

1 is a circuit configuration diagram of a motor drive device according to Embodiment 1 of the present invention. Operation explanatory diagram of the motor drive device shown in FIG. In the motor drive device shown in FIG. 1, an operation explanatory diagram when the phase of the sinusoidal voltage applied to the drive winding is controlled by the phase advance signal. In the motor drive device shown in FIG. 1, an operation explanatory diagram showing a state in which the advance angle value is set according to the motor drive speed and high-efficiency driving is performed. Operation waveform diagram in Embodiment 2 of the present invention The circuit block diagram of the motor drive device in Embodiment 3 of this invention The circuit block diagram of the motor drive device in Embodiment 4 of this invention Circuit configuration diagram of prior art motor drive device Operation explanatory diagram of the motor drive device shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Motor 11, 13, 15 Drive winding 5 DC power supply 6 Host device 20 Inverter 21, 23, 25 Positive side switch element 22, 24, 26 Negative side switch element 30 Controller 31 Waveform generator 32 Pulse width modulator 40 Speed Controller 60 Advance angle setting device 70 Level determination device 100 Motor drive device

Claims (3)

A motor having a mover and a drive winding, a waveform generator for generating a waveform signal for driving the motor in a sine wave, an inverter for applying a drive voltage based on the waveform signal to the drive winding, and the drive An advance angle setter that sets an advance angle value that is a phase advance angle of the drive voltage with respect to the induced voltage of the winding, and the advance angle setter can set a plurality of advance angle values, and the drive The advance angle setter is one of the advance values so that the phase of the sinusoidal drive current flowing in the winding substantially matches the phase of the induced voltage of the drive winding. A motor drive device that selects and sets. The motor drive device according to claim 1, wherein the advance angle setter selects and sets an advance value in accordance with a command value of the motor drive speed. 3. The motor driving device according to claim 1, wherein a part or all of the waveform generator, the inverter, and the advance angle setting device are formed by a semiconductor integrated circuit and are built in or integrated in the motor.