JP2016093854A - Electrically powered apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently drive an electrically powered apparatus by restraining an increase in driving electric power by an external load, in the electrically powered apparatus constituted so as to control driving of a motor by constant rotation control.SOLUTION: In an electrically powered apparatus for performing constant rotation control of a motor, by setting a motor control quantity so that an actual rotation speed of the motor becomes a command rotation speed (S390), when driving the motor (S240-YES), when a driving current of the motor exceeds a current threshold value (S340-YES), correction values α and β are set on the basis of a deviation between the current threshold value and the driving current (S370 and S380), and the motor control quantity (in other words, driving electric power of the motor) is restrained by correcting the command rotation speed and a rotation deviation integral value used for setting the motor control quantity by the set correction values α and β.SELECTED DRAWING: Figure 5

Description

  The present invention relates to an electric device operated by a motor.

  As one of this type of electric equipment, the target rotational speed of the motor is set according to the driving command from the user, and the motor driving power (generally the driving current) is set so that the actual rotational speed of the motor becomes the target rotational speed. A so-called constant rotation control system that performs feedback control is known.

  This electric device can drive the motor at a substantially constant rotational speed even when the external load fluctuates, so that the working efficiency is higher than that of a constant current drive type electric device that drives the motor at a constant current. Can be increased.

JP 2011-156629 A

  By the way, in the electric device of the constant rotation control system, when the rotation speed of the motor decreases with the increase of the external load, the drive current of the motor is increased in order to increase the rotation speed of the motor.

  And if the drive current is increased too much, the motor and the motor drive circuit will be damaged, so this type of electric equipment usually has a motor drive current that reaches a predetermined upper limit value. The energization is cut off to protect the motor and drive circuit from overcurrent.

  However, this protection function stops the drive of the motor to protect the motor and its drive circuit. When the external load increases, the drive current is suppressed and the drive of the motor is continued. I can't.

  For this reason, in the conventional electric device described above, even if the external load increases and the motor drive current increases, if the drive current does not reach the upper limit for overcurrent determination, the motor is driven by constant rotation control. In the meantime, the driving power of the motor may increase significantly.

  The present invention has been made in view of such problems, and in an electric device configured to drive and control a motor by constant rotation control, the electric device is controlled by suppressing the driving power of the motor when an external load increases. The purpose is to enable efficient driving.

  The electric device of the present invention includes a speed detection unit that detects the rotational speed of the motor, a current detection unit that detects the drive current of the motor, a control unit that controls the drive of the motor in response to a motor drive command from the outside, Is provided.

The control unit is a constant rotation control type that controls the driving power of the motor so that the rotation speed of the motor detected by the speed detection unit becomes a predetermined target speed.
When the motor drive current detected by the current detector exceeds a preset current threshold during motor drive control, the control unit corrects the control parameter used to control the motor drive power. Thus, so-called current limit control for suppressing the drive power of the motor is also executed.

  Therefore, according to the electric device of the present invention, even when the external load becomes large and the drive current of the motor rises during the drive control of the motor by the constant rotation control, the drive current is suppressed below the current threshold, It is possible to suppress power consumption associated with driving the motor.

  Also, in the present invention, when the motor drive current exceeds the current threshold, the control parameter used for constant rotation control of the motor is corrected instead of suppressing the drive power by cutting off the energization to the motor. By doing so, driving power (current) is suppressed.

  Therefore, according to the present invention, when the driving current of the motor exceeds the current threshold, it is possible to suppress the driving power while continuing to energize the motor. There is no periodic rotation fluctuation.

Therefore, according to the electric device of the present invention, it is possible to suppress the driving power and thus the power consumption while rotating the motor stably.
Here, the control unit may be configured to correct the control parameter by a predetermined correction amount when the driving current of the motor exceeds the current threshold value.

  In addition, the control unit sets a correction amount for the control parameter so that when the driving current of the motor exceeds the current threshold, the larger the driving current detected by the current detection unit is, the larger the current is You may comprise.

  In this way, a correction amount (in other words, a current limit value) can be set according to the magnitude of the motor drive current, and the power consumption can be reduced more efficiently while driving the motor. It becomes possible.

  In addition, when the drive current detected by the current detection unit exceeds the current threshold during motor drive control, the control unit suppresses the motor drive power by correcting the target speed, which is one of the control parameters. You may comprise.

  Further, when the control unit is configured to perform PI control (proportional integral control) of the motor in accordance with a control law having a proportional term and an integral term with respect to the deviation between the rotational speed of the motor and the target speed, it is proportional. The driving power of the motor may be suppressed by correcting at least one of the term and the integral term.

  Further, in the present invention, when the motor drive current exceeds the current threshold, the control unit suppresses the motor drive power by correcting the control parameters such as the target speed, proportional term, integral term, etc. The parameter correction amount may also be set by so-called PI control.

That is, the control unit may be configured to set the correction amount for correcting the control parameter based on the deviation between the motor drive current and the current threshold and the integrated value of the deviation.
In this way, when the external load increases and the motor drive current exceeds the current threshold, the drive current can be quickly converged below the current threshold while suppressing the vertical fluctuation of the drive current. become able to.

  Next, when the electric device is provided with a drive mode setting unit for setting the motor drive mode to one of a plurality of drive modes, the controller sets the drive set by the drive mode setting unit. Depending on the mode, at least one of the target speed and the current threshold value may be set.

  As described above, when the drive mode of the motor is changed, if the target speed and the current threshold for current limitation are set according to the drive mode, the motor is set according to the set drive mode. Good drive control can be achieved.

  Further, when the electric device is provided with a rotation direction setting unit for setting the rotation direction of the motor, the control unit sets the target speed and the speed according to the rotation direction set by the rotation direction setting unit. It may be configured to set at least one of the current thresholds. If it does in this way, it will become possible to drive-control a motor more optimally according to the rotation direction.

Furthermore, the control unit may be configured to notify that when the motor drive current detected by the current detection unit exceeds a preset current threshold during motor drive control.
In this way, the fact that the motor drive current has increased and the motor control by the control unit has been switched from normal "constant rotation control" to "constant rotation control + current limit control" is used. The user can be notified, and the usability of the electric device can be improved.

It is a perspective view showing the whole electric tool composition of an embodiment. It is a block diagram showing the circuit structure of an electric tool. It is explanatory drawing showing an example of the electric current threshold set according to the speed setting of a motor, and instruction | command rotation speed. It is a flowchart showing the control processing performed by MCU. It is a flowchart showing the motor control process performed in S170 of FIG.

Embodiments of the present invention will be described below with reference to the drawings.
As shown in FIG. 1, the electric power tool 1 of this embodiment is comprised as what is called a hammer drill.

  Specifically, the electric tool 1 includes a motor housing 2, a gear housing 3 positioned above the motor housing 2, a drill chuck 4 positioned in front of the gear housing 3, and an operation positioned in the rear of the gear housing 3. Part 5.

  The motor housing 2 houses a motor 20 (see FIG. 2) that generates a driving force for driving the drill chuck 4 to rotate. In the present embodiment, the motor 20 is a brushless motor.

  The gear housing 3 accommodates a gear mechanism (not shown) that transmits the driving force of the motor 20 to the drill chuck 4. Further, the gear housing 3 has a rotation for switching operation by the user of the electric tool 1 in order to set the rotation operation of the drill chuck 4 to, for example, a rotation (drill) mode, a hammer (hammer) mode, or the like. An operation mode changeover switch 6 (hereinafter referred to as SW) is provided.

  The drill chuck 4 includes a mounting mechanism (not shown) for detachably mounting a tool bit (not shown) on the front end of the drill chuck 4. Between the drill chuck 4 and the gear housing 3, a rod-like grip portion 7 extending downward from the electric power tool 1 is detachably attached to the electric power tool 1. The grip portion 7 is formed so that the user can hold the grip portion 7 with one hand.

  The operation unit 5 is formed so that the user can hold the operation unit 5 with the other hand. A trigger SW 8 for the user to drive / stop the motor 20 is provided on the front side of the operation unit 5. In addition, a rotation direction switching SW 9 for switching the rotation direction (forward / reverse rotation) of the motor 20 is provided in the upper part of the operation unit 5.

  A battery pack 10 is detachably attached to the lower end portion of the operation unit 5 from the electric tool 1. The battery pack 10 is configured such that, for example, a plurality of cells constituting a lithium ion battery are connected in series so that the output voltage at full charge is a predetermined voltage suitable for driving the motor 20.

  Although not shown in FIG. 1, on the rear side of the operation unit 5, as shown in FIG. 2, the user determines whether the motor 20 is driven at a low speed, a medium speed, or a high speed. A drive speed mode switching SW 12 for setting and a display unit 14 for displaying the state of the electric power tool 1 are also provided.

  The display unit 14 is for displaying the drive speed mode (low speed / medium speed / high speed) set via the drive speed mode switch SW12, the execution state of current limit control by motor control processing described later, and the like. For example, a plurality of light emitting elements such as LEDs or a display panel including an LCD or the like is used.

Next, the control circuit 30 shown in FIG.
The control circuit 30 drives and controls the motor 20 in accordance with the operation mode and the rotation direction set via each of the switch SWs 6, 9, 12, and controls the display unit 14 to drive speeds such as low speed, medium speed, and high speed. This is for displaying the execution state of the current limiting control.

  As shown in FIG. 2, the control circuit 30 includes a motor drive unit 32 that drives the motor 20 by energizing the motor 20, a current detection unit 34 that detects a current (drive current) flowing through the motor 20, and an MCU ( Micro Control Unit) 40.

  The control circuit 30 also includes a regulator unit 36 that receives power supply from the battery pack 10 and generates a power supply voltage (DC constant voltage). The MCU 40 operates by receiving power supply from the regulator unit 36. To do.

  The MCU 40 has a motor drive unit so that the rotation speed (rotation speed) of the motor 20 becomes a predetermined command rotation speed (target speed) based on detection signals from the rotation sensor 22 and the current detection unit 34 provided in the motor 20. A constant rotation control is executed to drive and control the motor 20 via 32.

  The command rotational speed (target speed) of the motor 20 is set according to the operation setting by each of the switch SW6, 9, 12 described above. For example, the command rotational speed when the rotational operation mode of the electric tool 1 is the drill mode is It is set as shown in FIG. 3 according to the driving speed mode and the rotation direction.

  That is, when the rotational direction of the motor 20 is the positive direction, for example, the command rotational speed when the drive speed is high is set to 7000 rpm, and the command rotational speed when the drive speed is medium speed is set to 5000 rpm. The command rotational speed when the drive speed is low is set to 3000 rpm. Further, when the rotation direction of the motor 20 is opposite to the forward direction (reverse rotation), for example, the command rotation speed is set to 3000 rpm regardless of the set drive speed.

  Further, when the motor 40 is driven by constant rotation control, the MCU 40 suppresses the driving power (current) of the motor 20 when the external load increases and the driving current of the motor 20 exceeds a predetermined current threshold. Therefore, in addition to the constant rotation control, current limit control is executed.

The current threshold value for determining whether or not to execute the current limit control is also set according to the drive speed mode and the rotation direction, similarly to the command rotational speed.
For example, as shown in FIG. 3, when the rotation direction of the motor 20 is the positive direction, the current threshold value when the driving speed is high is set to 20A, and the current threshold value when the driving speed is medium speed. Is set to 10A, and the current threshold when the driving speed is low is set to 5A. For example, when the rotation direction of the motor 20 is the reverse direction (reverse rotation) to the forward direction, the current threshold is set to 7A regardless of the set drive speed.

Next, control processing executed by the MCU 40 to control the drive of the motor 20 in this way will be described with reference to the flowcharts of FIGS. 4 and 5.
As shown in FIG. 4, when the MCU 40 is activated by receiving power supply from the regulator unit 36, first, in S <b> 110 (S represents a step), the MCU 40 determines whether or not a preset control cycle has elapsed. This waits for a predetermined control period to elapse.

  When it is determined in S110 that the predetermined control cycle has elapsed, a series of processes in S120 to S180 are executed, and by returning to S110 again, a series of processes in S120 to S180 are performed at a predetermined control period. Run periodically.

  In S120, a watchdog timer (WDT) for runaway monitoring of the MCU 40 is executed, WDT clear processing is executed, and in S130, the switch signal from the trigger SW8 and each of the switching SW6, 9, 12 is confirmed. Execute switch signal confirmation processing.

  Further, in the subsequent S140, A / D conversion processing is performed in which the drive current detected by the current detection unit 34 and the battery voltage supplied from the battery pack 10 are A / D converted, and in subsequent S150, The detection signal from the rotation sensor 22 provided in the motor 20 is taken in, and the rotation speed acquisition process for obtaining the rotation speed (rotation speed) of the motor 20 is executed.

  In the subsequent S160, an abnormality confirmation process for confirming various abnormalities such as a decrease in battery voltage and an abnormal rotation of the motor 20 from the A / D conversion result in S140 and the rotational speed of the motor 20 obtained in S150 is executed. To do.

  In subsequent S170, a motor control process for driving and controlling the motor 20 is executed, and in subsequent S180, the above-described driving speed mode (low speed / medium speed / high speed) and the execution state of the current limiting control are displayed on the display unit 14. The notification control process is executed, and the process proceeds to S110 again.

In the notification control process, when an abnormality is detected in the abnormality confirmation process in S160, the fact is displayed via the display unit 14.
Next, the motor control process executed in S170 will be described along the flowchart of FIG.

  As shown in FIG. 5, in the motor control process, first, in S210, the operation setting of any one of the rotation operation mode, the rotation direction, and the drive speed mode is changed via each of the switching SWs 6, 9, and 12 described above. It is determined whether or not.

  Then, when it is determined in S210 that the operation setting has been changed, by sequentially executing S220 and S230, using the changed operation setting and the map illustrated in FIG. Speed) and current threshold.

  That is, in S220 and S230, according to the driving speed of the motor 20 and the rotation direction of the motor 20 that have been changed through the switch SW6, 9, 12, the command rotational speed that is the target speed when driving the motor 20, and the motor A current threshold value that is an upper limit value of 20 drive currents is set.

  If it is determined in S210 that the operation setting has not been changed, or if the command rotation speed and the current threshold value are set in S220 and S230, the process proceeds to S240, and whether or not the trigger SW8 has been turned on. (In other words, whether or not the trigger SW 8 has been operated).

  If it is determined in S240 that the trigger SW8 has not been operated, the process proceeds to S250, and correction values α and β used to calculate the drive duty ratio (Duty), which is the control amount of the motor 20. , And the deviation integral value is initialized.

  That is, the control circuit 30 of the present embodiment is configured to drive and control the motor 20 by duty-controlling the energization period per predetermined rotation angle of the motor 20 via the motor driving unit 32.

For this reason, the MCU 40 calculates the motor control amount (Duty) in accordance with a control law described by the following equation in S390 described later when driving the motor 20 is controlled.
Motor control amount (Duty)
= Gp ((command rotational speed + α) −actual rotational speed))
+ Gi (rotational deviation integral value + β)
In the above equation, Gp is a proportional gain, Gi is an integral gain, the actual rotational speed is the actual rotational speed of the motor 20 detected using the rotation sensor 22, and the rotational deviation integrated value is the command rotational speed and the actual rotational speed. Is the integrated value of the deviation. Therefore, the term in the second row (first term) in the above formula is a proportional term, and the term in the third row (second term) is an integral term.

  In S250, since it is not currently necessary to control the motor 20, the correction value α for the command rotational speed, the correction value β for the rotational deviation integral value, and the rotational deviation integral value itself in the above equation are initialized. Set the value to “0”.

  In the subsequent S260, the motor control amount (Duty) is set to a value “0%” when the motor 20 is not driven and controlled, and the motor control process ends. The motor control amount (Duty) is used for duty control of energization (in other words, drive power) to the motor 20 via the motor drive unit 32.

  Next, in S240, if it is determined that the trigger SW8 is in the on state, the process proceeds to S270, where the latest set command rotational speed set in the process of S220 is the current motor 20 drive control. It is determined whether or not it is smaller than the current command rotational speed set for use.

  If it is determined in S270 that the set command rotational speed is smaller than the current command rotational speed, the process proceeds to S280, where a predetermined rotational speed N1 (for example, 100 rpm) is subtracted from the current command rotational speed. The current command rotational speed is updated, and the process proceeds to S290.

  It should be noted that the current command rotational speed used to actually drive and control the motor 20 approaches the set command rotational speed by the process of S280. As a result, for example, immediately after the start of driving of the motor 20, the current command rotational speed gradually increases, so that the motor 20 slowly rotates and rises, and the motor 20 can be soft-started.

Next, in S290, it is determined whether or not the set command rotational speed is equal to or greater than the current command rotational speed by updating the current command rotational speed in S280.
If the set command speed is not equal to or higher than the current command speed, the process proceeds to S340. If the set command speed is equal to or higher than the current command speed, the current command speed is set in S300. After setting to the command rotational speed, the process proceeds to S340.

On the other hand, if it is determined in S270 that the set command rotational speed is greater than or equal to the current command rotational speed, the process proceeds to S310, and it is determined whether or not the set command rotational speed is greater than the current command rotational speed. .
If it is determined in S310 that the set command rotational speed is not greater than the current command rotational speed, the set command rotational speed matches the current command rotational speed, and the process directly proceeds to S340.

  If it is determined in S310 that the set command rotational speed is greater than the current command rotational speed, the process proceeds to S320, where a predetermined rotational speed N2 (for example, 100 rpm) is added from the current command rotational speed to The command rotational speed is updated, and the process proceeds to S330.

  Note that the process of S320 is a process for gradually bringing the current command rotational speed used to drive and control the motor 20 gradually closer to the set command rotational speed, as in S280. And the process of S320 can prevent the rotational speed of the motor 20 from rapidly decreasing when the motor 20 is decelerated.

Next, in S330, it is determined whether or not the set command rotational speed has become equal to or less than the current command rotational speed by updating the current command rotational speed in S320.
If the set command rotational speed is not less than or equal to the current command rotational speed, the process proceeds to S340, and if the set command rotational speed is less than or equal to the current command rotational speed, the current command rotational speed is set in S300. After setting to the command rotational speed, the process proceeds to S340.

Next, in S340, it is determined whether the drive current of the motor 20 obtained in the A / D conversion process in S140 is larger than the current threshold updated in the current threshold change process in S230.
If it is determined in S340 that the drive current of the motor 20 is equal to or less than the current threshold, the correction values α and β are set to initial values “0” in S350 and S360, respectively, and the process proceeds to S390.

  If it is determined in S340 that the drive current of the motor 20 is larger than the current threshold value, the current drive current value (current current) obtained by the A / D conversion process in S140 is determined in S370 and S380. Value) and the current threshold value, the correction values α and β are calculated using the following equations, and the process proceeds to S390.

α = Ga (current threshold−current current value) + Gb (current deviation integrated value)
β = Gc (current threshold−current current value) + Gd (current deviation integrated value)
In the above equation, the current deviation integrated value is an integrated value of the deviation between the current threshold value and the current current value (current deviation: current threshold value−current current value). Ga and Gc are coefficients for current deviation, and are so-called proportional gains for calculating correction values. Gb and Gd are coefficients for the current deviation integral value, and are so-called correction value calculation integral gains.

  In the subsequent S390, the motor control amount (Duty) is calculated using the correction values α and β set in S350 and S360, or S370 and S380, and the motor control process ends.

  The motor control amount (Duty) is output to the motor drive unit 32 and used for duty control of energization of the motor 20 as described above. Further, the calculation of the motor control amount (Duty) in S390 uses the above-described control law “Duty = Gp ((command rotational speed + α) −actual rotational speed) + Gi (rotational deviation integrated value + β)”.

  As described above, in the electric power tool 1 of the present embodiment, the MCU 40 sets the motor control amount (Duty) so that the actual rotational speed of the motor 20 becomes the command rotational speed, so that the motor 20 is rotated at a constant speed. Control (so-called feedback control) is performed.

  Further, when the motor 20 is driven by the constant rotation control, if the drive current flowing through the motor 20 exceeds the current threshold, the command rotation number and the rotation deviation integral value used for setting the motor control amount (Duty) are corrected to correct the motor. Current limit control is also performed to suppress the increase of the drive current of 20.

  Therefore, according to the electric tool 1 of the present embodiment, when the motor 20 is driven by constant rotation control, even if the external load becomes large and the drive current rises, the drive current is suppressed to a current threshold value or less, The power consumption associated with the driving of the motor 20 can be suppressed.

  Further, in the present embodiment, when the drive current exceeds the current threshold, the energization to the motor 20 is not interrupted, but the control parameters for constant rotation control (that is, the command rotation speed and the rotation deviation integral value). Therefore, it is possible to suppress the driving power while stably rotating the motor 20.

  Further, in the present embodiment, when correcting the command rotational speed and the rotational deviation integral value, which are control parameters for constant rotational control, the correction values α and β are actually passed to the current threshold and the motor 20, respectively. It is set by proportional / integral of deviation (current deviation) from the drive current (current current value).

  For this reason, according to the electric tool 1 of the present embodiment, when the external load increases and the drive current of the motor 20 exceeds the current threshold, the drive current is kept below the current threshold while suppressing the vertical fluctuation of the drive current. Can be converged to.

  Furthermore, in this embodiment, the drive speed mode of the motor 20 can be set in three stages of high speed, medium speed, and low speed, and the rotation direction of the motor 20 is set to a reverse rotation direction different from the normal positive direction. You can also.

  Then, the MCU 40 sets a speed command value that is a target speed of the motor 20 and a current threshold according to each of these drive modes (high speed, medium speed, low speed, and reverse rotation), and the set speed command value and The motor 20 is configured to be driven and controlled according to the current threshold.

  Therefore, according to the electric power tool 1 of the present embodiment, the motor 20 can be optimally driven and controlled in accordance with each drive mode (high speed, medium speed, low speed, and reverse rotation). Power consumption during 20 driving can be suppressed.

  In the present embodiment, when the motor 20 is driven, the motor control process determines that the drive current has exceeded the current threshold value (S340-YES), and the current limit control is executed. Is displayed on the display unit 14.

  For this reason, according to the electric tool 1 of this embodiment, not only can the drive current of the motor 20 be suppressed by the current limit control, but also inform the user that the current limit control is being executed. Thus, the usability of the electric power tool 1 can be improved.

  That is, when the current limit control is started, the driving torque of the motor 20 is reduced, so that the user may feel uncomfortable, but by notifying the user of the execution state of the current limit control, the user feels uncomfortable. Since it can prevent giving, the usability of the electric tool 1 can be improved.

  In the present embodiment, the rotation sensor 22 corresponds to the speed detection unit of the present invention, the MCU 40 corresponds to the control unit of the present invention, and the drive speed mode switching SW corresponds to the drive mode setting unit of the present invention. The rotation direction switch SW9 corresponds to the rotation direction setting unit of the present invention.

As mentioned above, although one Embodiment of this invention was described, this invention is not limited to the said embodiment, A various aspect can be taken in the range which does not deviate from the summary of this invention.
For example, in the above embodiment, the case where the present invention is applied to the power tool 1 constituting the hammer drill has been described, but the present invention can be applied to a power tool other than the hammer drill.

  In addition, the present invention is not limited to an electric tool, and for example, if it is an electric device equipped with a motor such as a horticultural working machine such as a mower, a chain saw, etc., the present invention is applied in the same manner as in the above embodiment, and the same effect Can be obtained.

  In addition, the present invention can be applied to the rechargeable electric device that receives power supply from the battery pack or the electric device that operates by receiving AC power from a commercial power source, as in the above embodiment.

  The control circuit 30 may be provided with a programmable logic device such as an application specific integrated circuit (ASIC) or a field programmable gate array (FPGA) instead of the MCU 40.

  That is, the ASIC and FPGA can be programmed to function in the same manner as the MCU 40 of the above-described embodiment. Therefore, even if these devices are provided in the control circuit 30, the present invention is applied to the above-described embodiment. Similar effects can be obtained.

  In the above embodiment, the power tool 1 is described as driving and controlling the motor 20 by PI control. However, PID control (proportional integral derivative control) may be used.

  DESCRIPTION OF SYMBOLS 1 ... Electric tool, 2 ... Motor housing, 3 ... Gear housing, 4 ... Drill chuck, 5 ... Operation part, 6 ... Rotation operation mode switching SW, 7 ... Grip part, 8 ... Trigger SW, 9 ... Rotation direction switching SW, DESCRIPTION OF SYMBOLS 10 ... Battery pack, 12 ... Drive speed mode switching SW, 14 ... Display part, 20 ... Motor, 22 ... Rotation sensor, 30 ... Control circuit, 32 ... Motor drive part, 34 ... Current detection part, 36 ... Regulator part.

Claims (8)

A motor,
A speed detector for detecting the rotational speed of the motor;
A current detection unit for detecting a drive current of the motor;
A control unit for controlling the driving power of the motor so that the rotational speed of the motor detected by the speed detection unit becomes a predetermined target speed when receiving an instruction to drive the motor from the outside;
The control unit controls the driving power of the motor when the driving current of the motor detected by the current detection unit exceeds a preset current threshold during the driving control of the motor. An electric device configured to correct a control parameter to be used and suppress driving power of the motor.   The said control part is comprised so that the correction amount with respect to the said control parameter may be set so that it may become so large that the said drive current detected by the said current detection part is larger than the said current threshold value. Electric equipment. The controller is
During the drive control of the motor, when the drive current detected by the current detection unit exceeds the current threshold, the drive speed of the motor is suppressed by correcting the target speed as the control parameter. The electric device according to claim 1 or 2, wherein the electric device is configured. The controller is
In accordance with a control law having a proportional term and an integral term with respect to the deviation between the rotational speed of the motor and the target speed, the drive power of the motor is controlled,
When the drive current detected by the current detection unit exceeds the current threshold during drive control of the motor, the control parameter is corrected by correcting at least one of the proportional term and the integral term. Suppresses drive power,
The electric device according to claim 1, configured as described above. The controller is
When the drive current detected by the current detection unit exceeds the current threshold during the drive control of the motor, the control parameter is corrected based on the deviation between the drive current and the current threshold and the integrated value of the deviation. The electric device according to any one of claims 1 to 4, wherein the electric device is configured to set an amount. A drive mode setting unit for setting the drive mode when driving the motor to one of a plurality of drive modes;
The said control part is comprised so that at least one of the said target speed and the said current threshold value may be set according to the drive mode set in the said drive mode setting part. The electric device according to any one of the above. A rotation direction setting unit for setting the rotation direction of the motor;
The said control part is comprised so that at least one of the said target speed and the said current threshold value may be set according to the rotation direction set in the said rotation direction setting part. The electric device according to any one of the above.   The control unit is configured to notify that when the motor drive current detected by the current detection unit exceeds a preset current threshold during drive control of the motor. The electric device according to any one of claims 1 to 7.

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