JP6082681B2 - Motor drive control device and control method of motor drive control device - Google Patents

Description

  The present invention relates to a motor drive control device and a control method for the motor drive control device, and more particularly to a motor drive control device that controls driving of a motor according to a command signal input from the outside and a control method for the motor drive control device.

  As a method for controlling the rotational speed of a motor (for example, a brushless DC motor used as a fan motor or a fan motor) by a motor drive control device, a command signal is input from the outside, and the rotational speed of the motor is used as the command signal. Some control is performed so as to respond. Examples of the command signal include a PWM (pulse width modulation) signal, and the rotational speed of the motor is controlled in accordance with the duty ratio of the PWM signal.

  In the following Patent Document 1, in the drive circuit that controls the motor based on the PWM input signal, the duty ratio of the PWM input signal is not directly detected, but the deviation from 50% of the duty ratio of the PWM input signal is not detected. A configuration of a circuit that outputs a PWM drive signal based on this is disclosed.

  In the following Patent Document 2, a PWM buffer circuit that converts a duty cycle of an input PWM signal and the like in a speed control circuit that performs speed control using a PWM signal for a fan motor can be applied to the input PWM signal. A configuration for expanding a wide frequency range and duty cycle range is disclosed.

JP 2008-035653 A Japanese Patent Laid-Open No. 2005-006486

  By the way, when driving a motor using a motor drive control device, there is a case where control without using a speed control loop may be performed. In some cases, a speed control loop is formed, and a motor is operated at a specified rotation speed (rotation speed). In some cases, it is necessary for the motor drive control device to perform control so as to drive. As a motor drive control device that drives a motor using a PWM signal as a command signal, it is convenient to be able to control in such two control modes.

  The present invention has been made to solve such a problem, and is capable of driving a motor based on a PWM signal and can be used in a wide range of applications and control of the motor drive control device. It aims to provide a method.

In order to achieve the above object, according to one aspect of the present invention, a motor drive control device that performs drive control of a motor based on an input PWM signal operates in a control mode that performs drive control based on motor rotational speed information. Determining means for determining whether or not the first command means for outputting first speed command information corresponding to the PWM signal when at least the determining means determines not to operate in the control mode; and at least the determining means for controlling the control mode A clock signal generating means for generating a clock signal corresponding to the PWM signal, and a clock signal generated by the clock signal generating means when determined to operate in the control mode at least by the determining means; Based on the rotational speed information of the motor, the second command means for outputting the second speed command information and the determining means are operated in the control mode. When it is determined not to generate a drive control signal for driving the motor based on the first speed command information, and when the determination means determines to operate in the control mode, drive control is performed based on the second speed command information drive signal generating means for generating a signal, based on the drive control signal generated by the drive signal generating means, and a motor driving means for driving the motor by outputting a driving signal to the motor, determining means, advance motor The determination is performed according to setting information related to the operation mode of drive control set in the drive control device or a setting signal related to the operation mode of drive control input from the outside .

  Preferably, the first speed command information is information of a predetermined bit corresponding to the duty ratio of the PWM signal.

  Preferably, the clock signal generation means generates a clock signal based on information of a predetermined bit.

  Preferably, the clock signal is generated based on a plurality of bits higher than a predetermined bit of the first speed command information.

  Preferably, the clock signal is based on a comparison result between the plurality of upper bits of the first speed command information and the upper bits of the value obtained by subtracting a predetermined value from the first speed command information. The clock signal is generated so as to change with hysteresis in response to a change in information.

  Preferably, the information processing apparatus further includes a storage unit that stores setting information regarding the operation mode of the drive control, and the determination unit determines whether to operate in the control mode based on the setting information stored in the storage unit.

  Preferably, the first command means outputs the first speed command information regardless of the determination result of the determination means, and the second command means outputs the second speed command information regardless of the determination result of the determination means. .

  Preferably, the motor drive control device is entirely or partially packaged as an integrated circuit device.

According to another aspect of the present invention, a control method of a motor drive control device that performs drive control of a motor based on an input PWM signal operates in a control mode that performs drive control based on motor rotation speed information. A determination step for determining whether to operate in the control mode at least in the determination step, a first command step for outputting first speed command information corresponding to the PWM signal, and operation in the control mode in at least the determination step Then, when determined, a clock signal generation step for generating a clock signal corresponding to the PWM signal, and at least when the determination step is determined to operate in the control mode, the clock signal generated by the clock signal generation step, A second command step for outputting second speed command information based on the rotational speed information; A drive control signal for driving the motor is generated based on the first speed command information when it is determined that the control mode does not operate in the control mode, and a second speed command is determined when it is determined that the control mode is operated in the determination step. A drive signal generation step for generating a drive control signal based on the information, and a motor drive step for driving the motor by outputting a drive signal to the motor based on the drive control signal generated by the drive signal generation step , In the determination step, the determination is performed according to setting information related to the operation mode of drive control set in advance in the motor drive control device or a setting signal related to the operation mode of drive control input from the outside .

  According to these inventions, a drive control signal is generated based on the first speed command information or the second speed command information depending on whether or not to operate in the control mode. Therefore, it is possible to provide a motor drive control device and a control method for the motor drive control device that can drive the motor based on the PWM signal and can be used in a wide range of applications.

It is a block diagram which shows the circuit structure of the motor drive control apparatus in one of embodiment of this invention. It is a block diagram which shows the structure of a control circuit part. It is a figure which shows the relationship between setting information and an operation mode. It is a flowchart explaining operation | movement of a motor drive control apparatus. It is a figure explaining an example of the production | generation table of a clock signal. It is a 1st flowchart explaining operation | movement of a duty processing circuit. It is a 2nd flowchart explaining operation | movement of a duty processing circuit.

  Hereinafter, a motor drive control device according to an embodiment of the present invention will be described.

  [Embodiment]

  FIG. 1 is a block diagram showing a circuit configuration of a motor drive control device according to one embodiment of the present invention.

  As shown in FIG. 1, the motor drive control device 1 is configured to drive a motor 20 by, for example, sinusoidal drive. In the present embodiment, the motor 20 is, for example, a three-phase brushless motor. The motor drive control device 1 rotates the motor 20 by causing a sinusoidal drive current to flow through the armature coils Lu, Lv, Lw of the motor 20 based on the rotational position signal of the rotor. In the present embodiment, the rotational position signal of the rotor is a signal obtained by estimating the rotational position of the rotor from the output signal of the Hall element (not shown).

  The motor drive control device 1 includes a motor drive section (an example of motor drive means) 2 having an inverter circuit 2a and a predrive circuit 2b, and a control circuit section (an example of determination means) 4. The components of the motor drive control device 1 shown in FIG. 1 are a part of the whole, and the motor drive control device 1 has other components in addition to those shown in FIG. You may do it.

  In the present embodiment, the motor drive control device 1 is an integrated circuit device (IC) that is entirely packaged. A part of the motor drive control device 1 may be packaged as one integrated circuit device, or all or part of the motor drive control device 1 is packaged together with other devices as one integrated circuit device. A circuit device may be configured.

  The inverter circuit 2a constitutes the motor driving unit 2 together with the pre-drive circuit 2b. The inverter circuit 2a outputs a drive signal to the motor 20 based on the output signal output from the pre-drive circuit 2b, and energizes the armature coils Lu, Lv, Lw included in the motor 20. In the inverter circuit 2a, for example, a pair of series circuits of two switch elements provided at both ends of the DC power supply Vcc is connected to each phase (U phase, V phase, W phase) of the armature coils Lu, Lv, Lw. Are arranged and configured. In each pair of two switch elements, a terminal of each phase of the motor 20 is connected to a connection point between the switch elements (not shown).

  The pre-drive circuit 2b generates an output signal for driving the inverter circuit 2a based on the control by the control circuit unit 4, and outputs the output signal to the inverter circuit 2a. As output signals, for example, six types of Vuu, Vul, Vvu, Vvl, Vwu, and Vwl corresponding to each switch element of the inverter circuit 2a are output. By outputting these output signals, the switch elements corresponding to the respective output signals are turned on and off, a drive signal is output to the motor 20, and power is supplied to each phase of the motor 20.

  In the present embodiment, the control circuit unit 4 receives a rotation speed signal (an example of motor rotation speed information) Sr, a rotation speed command signal (an example of a PWM signal) Sc, and a start signal Ss.

  The rotation speed signal Sr is input from the motor 20 to the control circuit unit 4. The rotation speed signal Sr is an FG signal corresponding to the rotation of the rotor of the motor 20, for example. That is, the rotation speed signal Sr is rotation speed information indicating the detection result of the rotation speed of the motor 20. The FG signal may be a signal (pattern FG) generated using a coil pattern provided on a substrate on the rotor side, or generated using an output of a Hall (HALL) element arranged in the motor 20. May be a signal (hole FG). In addition, a rotational position detection circuit that detects a counter electromotive voltage induced in each phase (U, V, W phase) of the motor 20 is provided, and based on the detected counter electromotive voltage, the rotational position and the rotational speed of the rotor of the motor 20 are provided. May be detected, or a sensor signal such as an encoder for detecting the rotational speed or rotational position of the motor may be used.

  The rotational speed command signal Sc is input from the outside of the control circuit unit 4, for example. The rotational speed command signal Sc is a signal related to the rotational speed of the motor 20, and is, for example, a PWM signal corresponding to the target rotational speed of the motor 20. In other words, the rotation speed command signal Sc is information for designating the target rotation speed of the motor 20.

  The start signal Ss is input from the outside of the control circuit unit 4, for example. The start signal Ss is a signal for setting whether to perform drive control of the motor 20 or to enter a standby state in which drive control is not performed.

  The control circuit unit 4 is composed of, for example, a microcomputer or a digital circuit. The control circuit unit 4 outputs a drive control signal Sd to the pre-drive circuit 2b based on the rotation speed signal Sr, the rotation speed command signal Sc, the start signal Ss, and the rotation position signal. The control circuit unit 4 controls the rotation of the motor 20 by outputting the drive control signal Sd so that the motor 20 rotates at the rotation speed corresponding to the rotation speed command signal Sc. That is, the control circuit unit 4 outputs a drive control signal Sd for driving the motor 20 to the motor drive unit 2 to control the rotation of the motor 20. The motor drive unit 2 drives the motor 20 by outputting a drive signal to the motor 20 based on the drive control signal Sd.

  [Description of Control Circuit Section 4]

  FIG. 2 is a block diagram showing a configuration of the control circuit unit 4.

  As shown in FIG. 2, the control circuit unit 4 includes a duty processing circuit (an example of a first command means, an example of a clock signal generation means) 31, a speed control circuit (an example of second command means) 33, a sine A wave drive circuit (an example of a drive signal generation circuit) 35 and a memory (an example of a storage unit) 37 are included. Each circuit is a digital circuit. In FIG. 2, transmission / reception of signals and information between the circuits is related to the description related to generation of the drive control signal Sd.

  The memory 37 stores various set values used for the operation of the control circuit unit 4. The memory 37 stores clock generation information 37a and setting information 37b.

  Here, in the present embodiment, the control circuit unit 4 operates in one of the two drive control operation modes. The two operation modes include a “control mode” and a “non-control mode”. Which operation mode is used is determined by the control circuit unit 4 in accordance with, for example, 1-bit setting information 37 b stored in the memory 37. The control circuit unit 4 reads the setting information 37b stored in the memory 37 as the setting information D2, and performs a preset control operation in an operation mode according to the setting information D2.

  FIG. 3 is a diagram illustrating a relationship between the setting information D2 and the operation mode.

  Referring to FIG. 3, when the setting information D2 is “0”, for example, the control circuit unit 4 operates in the control mode. In the control mode, feedback control using the rotation speed of the motor 20 is performed so that the rotation speed of the motor 20 becomes the rotation speed corresponding to the rotation speed command signal Sc. That is, as will be described later, the control circuit unit 4 compares the clock signal S3 generated by the duty processing circuit 31 based on the rotational speed command signal Sc with the rotational speed signal Sr input from the motor 20, The motor 20 is controlled by generating speed command information (second speed command information S2) so that the signal S3 and the rotation speed signal Sr are the same.

  On the other hand, when the setting information D2 is “1”, for example, the control circuit unit 4 operates in the non-control mode. In the non-control mode, unlike the control mode, feedback control in consideration of the rotation speed of the motor 20 is not performed. That is, in the non-control mode, the control circuit unit 4 generates unique speed command information (first speed command information S1) based on the duty ratio of the rotation speed command signal Sc without depending on the rotation speed of the motor 20. Thus, the motor 20 is controlled.

  FIG. 4 is a flowchart for explaining the operation of the motor drive control device 1.

  As shown in FIG. 4, in step S <b> 311, the rotation speed command signal Sc (PWMDUTY) is input to the control circuit unit 4. The rotation speed command signal Sc is input to the duty processing circuit 31.

  In step S312, the duty processing circuit 31 generates predetermined bit information (a value of a predetermined number of bits) according to the duty ratio of the rotation speed command signal Sc. In the present embodiment, a 10-bit value is generated as the value of the predetermined number of bits. The 10-bit value is generated, for example, by performing a shift operation or addition based on the count number in one cycle of the rotation speed command signal Sc and the count number in the H section (on-duty section).

  In step S313, the control circuit unit 4 determines whether or not the operation mode is a non-control mode. As described above, the control circuit unit 4 determines whether the operation mode is the control mode or the non-control mode according to the setting information 37b.

  If the operation mode is the non-control mode in step S313 (in the case of YES), the generated 10-bit value is output from the duty processing circuit 31 as the first speed command information S1 in step S314. Then, a drive control signal Sd based on the output first speed command information S 1 is output from the sine wave drive circuit 35.

  When the operation mode is not the non-control mode in step S313, that is, in the control mode (in the case of NO), in step S315, the duty processing circuit 31 generates a speed reference clock (clock signal S3) from the 10-bit value, and speed control is performed. Output to the circuit 33. At this time, a hysteresis operation is performed as described later.

  In step S316, the speed control circuit 33 compares the clock signal S3 with the rotation speed signal Sr, and the rotation speed (rotation speed) of the motor 20 corresponds to the rotation speed corresponding to the clock signal S3, that is, the rotation speed command signal Sc. 2nd speed command information S2 is generated so that it may become the rotation speed which carries out. The second speed command information S2 is output from the speed control circuit 33. Then, a drive control signal Sd based on the output second speed command information S2 is output from the sine wave drive circuit 35.

  When the drive control signal Sd is output based on the first speed command information S1 in step S314 or the drive control signal Sd is output based on the second speed command information S2 in step S316, the process of step S317 is performed. Is called. That is, the motor drive unit 2 drives the motor 20 by outputting a drive signal to the motor 20 based on the drive control signal Sd output from the sine wave drive circuit 35.

  In the present embodiment, regardless of the operation mode, both the first speed command information S1 and the second speed command information S2 are included in the sine wave drive circuit 35 when the motor 20 is driven. 35. That is, regardless of the operation mode, the duty processing circuit 31 outputs the first speed command information S1 and the clock signal S3, and the speed control circuit 33 outputs the second speed command information S2. The sine wave driving circuit 35 is provided with a switching circuit 35b. The switching circuit 35b switches between the first speed command information S1 and the second speed command information S2 to be used for generating the drive control signal Sd in the sine wave drive circuit 35 in accordance with the setting information D2. In other words, the sine wave drive circuit 35 generates the drive control signal Sd based on the speed command information selected by the switching circuit 35b according to the setting information D2. When the rotation speed signal Sr is not input, the speed control circuit 33 may be configured to output the second speed command information S2 corresponding to the clock signal S3, for example.

  On the other hand, the control circuit unit 4 may operate as follows based on the setting information 37b. That is, all of the duty processing circuit 31, the speed control circuit 33, and the sine wave drive circuit 35 may determine (determine) whether to operate in the non-control mode or the control mode, Some of them may be judged and other circuits may be operated accordingly.

  For example, the duty processing circuit 31 may output the first speed command information S1 when operating in the non-control mode, and may not output the first speed command information S1 when operating in the control mode. The clock signal S3 may not be output when operating in the non-control mode, and the clock signal S3 may be output when operating in the operation mode.

  The speed control circuit 33 may not output the second speed command information S2 when operating in the non-control mode, and may output the second speed command information S2 when operating in the control mode. Further, whether or not the rotation speed information Sr is input, whether or not the second speed command information S2 is output may be switched according to the value, and whether or not the clock signal S3 is input. Accordingly, whether to output the second speed command information S2 may be switched.

  Thus, in the configuration in which whether the first speed command information S1 or the second speed command information S2 is output is switched according to the operation mode, the sine wave drive circuit 35 particularly has the speed command information S1. , S2 may not be used, and the drive control signal Sd may be generated according to the input information, or a switching circuit may be used as described above.

  [Generation of clock signal S3]

  Here, the clock signal S3 is generated based on a plurality of high-order bits of the predetermined bits of the first speed command information S1. In the present embodiment, the clock signal S3 is generated based on a table value represented by the upper 5 bits of the first speed command information S1 that is a 10-bit value. The clock signal S3 is not limited to the upper 5 bits in the first speed command information S1, but may be generated using a plurality of upper bits of 10 bits.

  The clock signal S3 is generated based on, for example, a generation table expressed based on clock generation information 37a stored in the memory 37. The generation table is generated when the duty processing circuit 31 reads the clock generation information 37a from the memory 37 as the clock generation information D1.

  FIG. 5 is a diagram for explaining an example of the generation table of the clock signal S3.

  In the generation table shown in FIG. 5, “input No.”, “duty ratio (DUTY)”, and “internally generated CLK (clock)” are shown in association with each other. In the present embodiment, when the clock signal S3 is generated based on the above-described table value, the table value (32-stage value) corresponds to “input No.”, and the clock signal S3 generated accordingly is “ This corresponds to “internally generated CLK”. “Duty ratio” is shown corresponding to each of the table values. For example, when a rotational speed command signal Sc having a duty ratio of 45% is input, the table value is “14”, and the corresponding clock signal S3 is “440 Hz”.

  As the clock generation information 37a, for example, the frequency value (minimum frequency) fmin of the minimum clock signal S3 when there is an output, and the value (variation frequency) df of the change amount of the frequency of the clock signal S3 with respect to the increase of the table value Is stored. In the example shown in FIG. 5, for example, “50 Hz” is set as fmin and “30 Hz” is set as df. That is, when the output is the lowest (not zero) and the table value is “1”, the clock signal S3 is “50 Hz”. Then, as the table value increases to “2” and “3”, the clock signal S3 increases by “80 Hz”, “110 Hz” and the value of df. The range of the clock signal S3 is 0 Hz to 980 Hz, but is not limited to this.

  When the frequency of the clock signal S3 is determined based on the generation table, the frequency value is repeatedly added, and the frequency division ratio in the frequency dividing circuit of the predetermined frequency is obtained by obtaining the number of additions until the addition result reaches the predetermined value. Is generated. The clock signal S3 is output as a waveform based on the frequency division ratio.

  Here, in the present embodiment, a hysteresis operation is performed when the clock signal S3 is generated. That is, the table value for obtaining the output clock signal S3 is determined so as to change with hysteresis with respect to the change in the first speed command information S1. Thus, the clock signal S3 is generated so as to change with hysteresis with respect to the change in the first speed command information S1 (that is, the change in the rotation speed command signal Sc).

  Specifically, the table value is represented by the first five bits of the first comparison value of the value of the first speed command information S1 and the upper five bits of the value after subtracting a predetermined value from the first speed command information S1. It is determined according to the comparison result with the second comparison value.

  FIG. 6 is a first flowchart for explaining the operation of the duty processing circuit 31.

  The initial value of the table value is set to “0”, for example. The table value corresponds to a 5-bit value, and can take values from “0” to “32”, for example. The process shown in FIG. 6 is always repeated.

  As shown in FIG. 6, in step S331, the duty processing circuit 31 determines whether or not the measurement counter in the L section (off duty section) of the rotation speed command signal Sc (PWMDUTY) has overflowed. That is, it is determined whether the duty ratio of the rotation speed command signal Sc is not 0%.

  If the duty ratio is 0% in step S331 (in the case of NO), the table value is updated to “0” in step S332.

  If the duty ratio is not 0% in step S331 (in the case of YES), in step S333, the duty processing circuit 31 determines whether the measurement counter in the H section (on-duty period) of the rotation speed command signal Sc has overflowed. Determine whether. That is, it is determined whether the duty ratio of the rotation speed command signal Sc is not 100%.

  If the duty ratio is 100% in step S333 (in the case of NO), the table value is updated to the upper limit “32” in step S334.

  If the duty ratio is not 100% in step S333 (in the case of YES), in step S335, a setting process of a value VSP_HIS that is a basis of the second comparison value is performed.

  FIG. 7 is a second flowchart for explaining the operation of the duty processing circuit 31.

  As shown in FIG. 7, in step S351, it is determined whether or not the value of the 10-bit value VSP_DUTY corresponding to the rotation speed command signal Sc is equal to or greater than a predetermined value “5”.

  If it is equal to or greater than the predetermined value in step S351 (in the case of YES), in step S352, a value obtained by subtracting the predetermined value “5” from VSP_DUTY is set as a value VSP_HIS that is the basis of the second comparison value.

  If it is not greater than or equal to the predetermined value in step S351 (in the case of NO), in step S353, the value VSP_HIS that is the basis of the second comparison value is set to “0”. By performing such processing, the value VSP_HIS that is the basis of the second comparison value is set to a non-negative value.

  Returning to FIG. 6, in step S336, it is determined whether or not the first comparison value VSP_DUTY [9: 5] is equal to the second comparison value VSP_HIS [9: 5]. Here, the first comparison value VSP_DUTY [9: 5] (hereinafter simply referred to as the first comparison value) is a value of the upper 5 bits of the 10-bit value VSP_DUTY corresponding to the rotation speed command signal Sc. The second comparison value VSP_HIS [9: 5] (hereinafter simply referred to as the second comparison value) is a value of the upper 5 bits of the 10-bit value VSP_HIS set by performing subtraction as described above.

  If the first comparison value and the second comparison value are equal in step S336 (in the case of YES), the process of step S337 is performed. That is, in step S337, the table value is updated using the first comparison value as the table value.

  If the first comparison value and the second comparison value are not equal in step S336 (in the case of NO), the process of step S338 is performed. In step S338, it is determined whether there is a difference of 2 or more between the currently selected table value and the second comparison value.

  If there is a difference of 2 or more in step S338 (in the case of YES), the process of step S339 is performed. That is, in step S339, the table value is updated using the second comparison value as the table value.

  On the other hand, if there is no difference of 2 or more in step S338 (in the case of NO), the process of step S340 is performed. That is, in step S340, the currently selected table value is held (the table value is not changed).

  [Effects of the embodiment]

  As described above, in the present embodiment, the motor drive control device 1 has two different types based on the rotational speed command signal Sc depending on whether the operation mode is the non-control mode or the control mode. The motor 20 can be driven in a control manner. That is, even if the rotational speed signal Sr from the motor 20 is not input or the feedback control of the rotational speed of the motor 20 is performed, the motor 20 is controlled using the same motor drive control device 1. The motor drive control device 1 can be used for a wide range of applications. Since the operation mode is determined based on the setting information 37b in the memory 37, the operation mode can be easily set by appropriately setting the setting information 37b.

  The second speed command information S2 required in the control mode is generated based on the first speed command information S1. That is, the motor 20 can be driven in the non-control mode by using a part of the circuit used in the control mode. In addition, a digital circuit can be used to calculate digital information and generate a signal for efficiently driving the motor 20. Therefore, the circuit scale of the motor drive control device 1 can be made compact.

  In the control mode, a hysteresis operation is performed when the clock signal S3 used to generate the second speed command information S2 is generated. Therefore, the duty ratio of the rotation speed command signal Sc is frequently wide enough to cross the table value threshold. Even if it is changed, the clock signal S3 is not disturbed. Therefore, the rotation operation of the motor 20 can be stabilized.

  [Others]

  The control circuit unit is not limited to the circuit configuration as shown in FIG. Various circuit configurations configured to meet the objects of the present invention can be applied.

  The operation mode is not limited to the one determined according to the setting information stored in the memory, and the operation mode may be determined according to the setting signal input from the outside of the control circuit unit. The operation mode may be determined according to various detection results relating to the operation of the motor.

  Each component of the motor drive control device may be at least partly processed by software rather than processed by hardware.

  The motor driven by the motor drive control device of the present embodiment is not limited to a three-phase brushless motor, and may be another type of motor.

  The present invention is not limited to a motor drive control device that drives a motor by a sine wave drive method, and may be applied to a motor drive control device that drives a motor by a rectangular wave drive method, for example.

  Part or all of the processing in the above-described embodiment may be performed by software or may be performed using a hardware circuit.

  The above embodiment should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

DESCRIPTION OF SYMBOLS 1 Motor drive control apparatus 2 Motor drive part (an example of a motor drive means)
4 Control circuit section (an example of determination means)
20 motor 31 duty processing circuit (an example of a first command means, an example of a clock signal generation means)
33 Speed control circuit (an example of second command means)
35 Sine wave drive circuit (example of drive signal generation circuit)
35b switching circuit 37 memory (an example of storage means)
37a Clock generation information 37b Setting information Sc Rotational speed command signal (an example of PWM signal)
Sd drive control signal Sr rotation speed signal (an example of motor rotation speed information)
S1 First speed command information S2 Second speed command information S3 Clock signal Ss Start signal

Claims (9)

A motor drive control device that performs drive control of a motor based on an input PWM signal,
Determining means for determining whether or not to operate in a control mode for performing drive control based on rotation speed information of the motor;
First command means for outputting first speed command information corresponding to the PWM signal when at least the decision means decides not to operate in the control mode;
Clock signal generating means for generating a clock signal corresponding to the PWM signal when it is determined at least by the determining means to operate in the control mode;
A second speed command information is output based on the clock signal generated by the clock signal generating means and the rotational speed information of the motor when at least the determining means determines to operate in the control mode; Command means;
When it is determined by the determining means that the motor does not operate in the control mode, a drive control signal for driving the motor is generated based on the first speed command information, and the determining means is determined to operate in the control mode. Drive signal generating means for generating the drive control signal based on the second speed command information when
Motor drive means for driving the motor by outputting a drive signal to the motor based on the drive control signal generated by the drive signal generation means ;
The motor drive control device, wherein the determination unit performs the determination according to setting information related to a drive control operation mode set in the motor drive control device in advance or a setting signal related to a drive control operation mode input from the outside .   2. The motor drive control device according to claim 1, wherein the first speed command information is information of a predetermined bit corresponding to a duty ratio of the PWM signal.   The motor drive control device according to claim 2, wherein the clock signal generation unit generates the clock signal based on information of the predetermined bit.   4. The motor drive control device according to claim 2, wherein the clock signal is generated based on a plurality of bits higher than the predetermined bit of the first speed command information. 5.   The clock signal is based on a comparison result between the higher order multiple bits of the first speed command information and the higher order bits of a value after subtracting a predetermined value from the first speed command information. The motor drive control device according to claim 4, wherein the clock signal is generated so as to change with hysteresis with respect to a change in one speed command information. Further comprising a storage means for storing setting information on the operating mode of the drive control,
6. The motor drive control device according to claim 1, wherein the determination unit determines whether or not to operate in the control mode based on the setting information stored in the storage unit. The first command means outputs the first speed command information regardless of the decision result of the decision means,
7. The motor drive control device according to claim 1, wherein the second command unit outputs the second speed command information regardless of a determination result of the determination unit.   The motor drive control device according to any one of claims 1 to 7, wherein the motor drive control device is entirely or partially packaged as an integrated circuit device. A control method of a motor drive control device that performs drive control of a motor based on an input PWM signal,
A determination step for determining whether or not to operate in a control mode for performing drive control based on the rotational speed information of the motor;
A first command step for outputting first speed command information corresponding to the PWM signal when it is determined that at least the determination step does not operate in the control mode;
A clock signal generating step for generating a clock signal corresponding to the PWM signal when it is determined at least in the determining step to operate in the control mode;
A second speed command information is output based on the clock signal generated by the clock signal generation step and the rotation speed information of the motor when it is determined at least in the determination step to operate in the control mode; A command step;
When it is determined in the determining step that the motor does not operate in the control mode, a drive control signal for driving the motor is generated based on the first speed command information, and in the determining step, the motor is determined to operate in the control mode. A drive signal generating step for generating the drive control signal based on the second speed command information when
A motor driving step of driving the motor by outputting a driving signal to the motor based on the driving control signal generated by the driving signal generating step ;
In the motor drive control device, the determining step performs the determination in accordance with setting information related to an operation mode of drive control set in advance in the motor drive control device or a setting signal related to an operation mode of drive control input from the outside . Control method.

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