JP2014082911A - Motor drive control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor drive control device capable of suppressing the standby power of a motor control circuit constant by a simple and low-cost configuration and achieving energy conservation, without generating a large rush current in starting operation of a motor from an operation standby state and regardless of the configuration of the motor control circuit.SOLUTION: A motor drive control device includes: a step-down power supply 4 generating a low-voltage DC power source supplied to a motor control circuit 5 from an AC commercial power supply 1; current limiting means 6 for limiting a supply current to the motor control circuit 5; and control means 9 for controlling the motor control circuit 5 and the current limiting means 6. When a motor 7 is operated, the control means 9 limits the supply current to the motor control circuit 5 to a first current limit value in which the motor control circuit is operable. When the motor 7 is in an operation standby state, the control means 9 limits the supply current to the motor control circuit 5 to a second current limit value lower than a consumption current value at the time of stopping the motor control circuit 5.

Description

  The present invention relates to a motor drive control device for a device having an operation standby state such as a dehumidifier or an air conditioner.

  As a blower motor used in a dehumidifier or an air conditioner, in general, a driving circuit (switching circuit) that generates a three-phase alternating current for switching a high-voltage direct current voltage to drive the motor, A PWM DC motor that drives a motor by a motor control circuit that controls switching is employed.

  When power is supplied to the control circuit of the PWM DC motor when the motor is stopped, including during standby, if the power is supplied to the control circuit of the PWM DC motor, the leakage current continues to flow through the control circuit of the PWM DC motor. Will continue to be consumed. For this reason, for example, the power supply path to the control circuit of the PWM DC motor is cut off during operation standby (for example, Patent Document 1), or the power supply voltage for the control circuit of the PWM DC motor is decreased (for example, patent) Document 2) discloses a technique for suppressing power consumption during operation standby (hereinafter referred to as “standby power”).

Japanese Patent No. 4153586 JP 2011-17491 A

  However, in the technique described in Patent Document 1, a switch such as a relay provided in the power supply path to the control circuit of the PWM DC motor is shut off during operation standby, and this switch is turned on at the start of operation. Therefore, a large inrush current flows through the switch when the operation is started from the operation standby state. The occurrence of this large inrush current is a cause of failure of switches, power supplies, control circuits, etc., so there is a problem that parts that ensure sufficient derating against the inrush current are required, which increases the area occupied by the board and increases costs. there were.

  Further, in the technique described in Patent Document 2 described above, during operation standby, a range pulse is applied to the voltage variable means to reduce the power supply voltage for the control circuit of the PWM DC motor. Since the impedances of the ICs constituting the control circuit are different for each type, in order to keep the standby power of the PWM DC motor control circuit constant, the ICs constituting the PWM DC motor control circuit are different for each type. It is necessary to set the power supply voltage to be supplied during standby. For this reason, the pulse width of the narrow pulse output from the microcomputer is set for each type of IC constituting the control circuit of the PWM DC motor, or a narrow pulse generating means is provided to provide a PWM DC motor control circuit. There is a problem that it is necessary to increase the cost due to the complexity of the circuit and to change the setting / design, for example, to change the design value for each type of IC constituting the circuit.

  The present invention has been made in view of the above, and does not generate a large inrush current when starting motor operation from an operation standby state, and is simple and inexpensive regardless of the configuration of the motor control circuit. It is an object of the present invention to provide a motor drive control device that can suppress standby power of a motor control circuit with a simple configuration and can save energy.

  In order to solve the above-described problems and achieve the object, a motor drive control device according to the present invention reduces power consumption in a motor control circuit that controls the motor drive circuit in an operation standby state in which the motor is stopped. A motor drive control device for generating a low-voltage DC power supplied from an AC commercial power source to the motor control circuit, a current limiting means for limiting a supply current to the motor control circuit, and the motor control circuit And a control means for controlling the current limiting means, wherein the control means supplies a current supplied to the motor control circuit during operation of the motor to a first current limit capable of operating the motor control circuit. The motor speed command is output to the motor control circuit based on an external operation command, and the motor operation is stopped. During operation standby, the current supplied to the motor control circuit, and limits to a second current limit value smaller than the current consumption value at the time of stopping of the motor control circuit.

  According to the present invention, the standby power of the motor control circuit can be generated with a simple and inexpensive configuration without generating a large inrush current when starting the operation of the motor from the operation standby state and without depending on the configuration of the motor control circuit. Can be suppressed to a certain level and energy saving can be achieved.

FIG. 1 is a diagram illustrating a configuration example of a motor drive control device according to the first embodiment. FIG. 2 is a flowchart of an example of an operation start process and a transition process to an operation standby state of the motor drive control device according to the first embodiment. FIG. 3 is a diagram of a configuration example of the motor drive control device according to the second embodiment.

  Hereinafter, an air conditioner according to an embodiment of the present invention and a control method thereof will be described with reference to the accompanying drawings. In addition, this invention is not limited by embodiment shown below.

Embodiment 1 FIG.
FIG. 1 is a diagram illustrating a configuration example of a motor drive control device according to the first embodiment. As shown in FIG. 1, a motor drive control device 100 according to the first embodiment includes a motor control circuit 5 that controls a drive circuit (switching circuit) 8 that drives a motor 7, a rectifier circuit 2, and an AC commercial power supply 1. A step-down power supply 4 that generates a low-voltage DC power supply that steps down a high-voltage DC voltage smoothed by a smoothing capacitor 3 and supplies the same to a motor control circuit 5, a current limiting means 6 that limits a supply current to the motor control circuit 5, and a motor And a microcomputer 9 which is a control means for controlling the control circuit 5 and the current limiting means 6.

  In this embodiment, the current limiting means 6 is connected in series between the PNP-type bipolar transistor 10 connected to the power supply path from the step-down power supply 4 to the motor control circuit 5 and the base-ground of the bipolar transistor 10. The resistor 11 and the resistor 12 and a switch (transistor switch) 13 for short-circuiting the resistor 12 are provided. The resistor 11, the resistor 12, and the transistor switch 13 constitute a base current switching circuit 15 that switches the base current value of the bipolar transistor 10 by short-circuiting the resistor 12 in accordance with a current limit switching command from the microcomputer 9. ing.

  Next, the operation of the motor drive control device according to the first embodiment will be described. The AC voltage of the AC commercial power supply 1 is rectified by the rectifier circuit 2, smoothed by the smoothing capacitor 3, and converted into a high-voltage DC voltage. The high-voltage DC voltage is applied as a power supply voltage for the drive circuit 8 of the motor 7 and is converted into a low-voltage DC voltage (for example, 15 V) by the step-down power supply 4.

  When the motor 7 is on standby, the microcomputer 9 outputs a speed command for stopping the motor 7 to the motor control circuit 5 and turns off the transistor switch 13 of the base current switching circuit 15, that is, current limit switching. Control the command off. At this time, the base current value of the bipolar transistor 10 is determined depending on the combined resistance value of the resistor 11 and the resistor 12.

  During operation of the motor 7, the microcomputer 9 outputs a speed command for driving the motor 7 to the motor control circuit 5 based on an operation command from the outside such as a remote controller (not shown), and a base current. The transistor switch 13 of the switching circuit 15 is turned on, that is, the current limit switching command is turned on. At this time, the base current value of the bipolar transistor 10 is determined depending on the resistance value of the resistor 11.

  Here, the resistance value of the resistor 11 connected to the base terminal of the transistor 10 is a base current that can sufficiently drive the power supply current required for the operation of the motor control circuit 5 by the bipolar transistor 10 during operation of the motor 7. Set to a value that can be passed. Thereby, during operation of the motor 7, the supply current to the motor control circuit 5 is limited to the first current limit value at which the motor control circuit 5 can operate.

  Further, the resistance value of the resistor 12 connected in series with the resistor 11 is applied to the motor control circuit 5 when the motor 7 is stopped, that is, when the voltage of the same value as that during operation is applied when the motor 7 is on standby. In order to limit the base current that can drive only a sufficiently small current (for example, 1 mA) to the flowing power source current (for example, 100 mA), the value is set to a value sufficiently larger than that of the resistor 11. Thus, when the motor 7 is on standby, the current supplied to the motor control circuit 5 is a second current limit value (here, 100 mA) smaller than the current consumption value (eg, 100 mA here) when the motor control circuit 5 is stopped. For example, 1 mA).

  Thus, when the motor 7 is in operation, the transistor switch 13 of the base current switching circuit 15 is turned on, that is, the current limit switching command is turned on, so that the current flows through the bipolar transistor 10 that is the load current of the step-down power supply 4. The power supply current of the motor control circuit 5 is limited to the first current limit value that can supply the power supply current necessary for the operation of the motor control circuit 5. When the motor 7 is on standby, the transistor switch 13 of the base current switching circuit 15. , That is, by controlling the current limit switching command to be off, the power supply current of the motor control circuit 5 flowing in the bipolar transistor 10 that is the load current of the step-down power supply 4 is the current consumption when the motor control circuit 5 is stopped. Since this is limited to the second current limit value that is sufficiently smaller than the value, the standby power of the motor control circuit 5 is suppressed. It can be.

  Further, even when the motor 7 is stopped, that is, even when the impedance of the motor control circuit 5 during standby is different depending on the type of IC constituting the motor control circuit 5, the load current of the step-down power supply 4, that is, the motor control circuit 5 is limited by a constant second current limit value (in this case, for example, 1 mA), the load of the step-down power supply 4, that is, the standby power of the motor control circuit 5 is constant (here 15V × 1 mA = 15 mW). That is, the standby power of the motor control circuit 5 can be kept constant without changing the setting / design depending on the type of IC constituting the motor control circuit 5 or the like.

  Further, since a constant current is supplied to the motor control circuit 5 during operation standby, the inrush current flowing through the motor control circuit 5 via the bipolar transistor 10 when starting the operation of the motor 7 from the operation standby state is suppressed. It becomes possible.

  In the example shown in FIG. 1, the resistor 12 is short-circuited by the transistor switch 13 and the base current value of the bipolar transistor 10 is switched. However, the resistance values of the resistor 11 and the resistor 12 are switched, and the resistor 11 is short-circuited. The base current value of the bipolar transistor 10 may be switched. The transistor switch 13 may be configured to use an insulating switch such as a photocoupler.

  Next, an operation start process and a transition process to the standby state of the motor drive control apparatus 100 according to the first embodiment will be described with reference to FIGS. 1 and 2. FIG. 2 is a flowchart of an example of an operation start process and a transition process to an operation standby state of the motor drive control device according to the first embodiment.

  When the AC commercial power supply 1 is supplied and the control power is supplied to the microcomputer 9, the process shown in FIG. First, when the power is turned on, the microcomputer 9 outputs a speed command for stopping the motor 7 to the motor control circuit 5 and controls the transistor switch 13 of the base current switching circuit 15 to be turned off, that is, the current. Initial setting is performed so that the limit switching command is controlled to be turned off (step ST101), and an operation command from the outside such as a remote controller (not shown) is awaited in an operation standby state (step ST102).

  When there is no operation command input (step ST102; No), the microcomputer 9 maintains the initial setting state and is kept in the operation standby state. When the operation command is input (step ST102; Yes), the microcomputer 9 controls the transistor switch 13 of the base current switching circuit 15 to be on, that is, controls the current limit switching command to be on (step ST103). A timer (not shown) is started (step ST104), the internal timer is counted (step ST105), the transistor switch 13 is turned on, that is, the current limit switching command is turned on (step ST103), It is determined whether or not a predetermined time set in advance has passed (step ST106).

  When the transistor switch 13 is turned on, that is, the current limit switching command is turned on (step ST103), and the preset predetermined time has not elapsed (step ST106; No), the microcomputer 9 13 is maintained, and the output state of the speed command for stopping the motor 7 is maintained. After the transistor switch 13 is turned on, that is, the current limit switching command is turned on (step ST103), when a predetermined time set in advance elapses (step ST106; Yes), the microcomputer 9 causes the motor control circuit 5 to On the other hand, processing necessary for normal operation, such as outputting a speed command of the motor 7 based on the operation command, is performed, and the operation of the motor 7 is started (step ST107).

  Here, after the transistor switch 13 is turned on, that is, the current limit switching command is controlled to be turned on (step ST103), a speed command of the motor 7 based on the operation command is output to the motor control circuit 5, etc. Processing required for normal operation is performed until the motor 7 starts to operate (step ST107). The predetermined time required for the operation of the motor control circuit 5 when the transistor 7 is turned on when the transistor switch 13 is turned on. The time until the power supply current becomes stable and can be output is set. In this way, the operation of the motor 7 can be started in a state where the power supply current necessary for the operation of the motor control circuit 5 is supplied when the motor 7 is operated.

  Thereafter, the microcomputer 9 waits for an operation stop command from the outside such as a remote controller (not shown) (step ST108). When the operation stop command is not input (step ST108; No), the microcomputer 9 maintains the output state of the speed command of the motor 7 based on the ON state / operation command of the transistor switch 13, and the operation of the motor 7 is continued. The When the operation stop command is input (step ST108; Yes), the microcomputer 9 stops the output of the speed command of the motor 7 based on the operation command to the motor control circuit 5, and stops the motor 7. Is output (step ST109), an internal timer (not shown) is started (step ST110), the internal timer is counted (step ST111), and the operation stop process is performed. Then, after outputting the speed command for stopping the motor 7 based on the operation command to the motor control circuit 5 and outputting the speed command for stopping the motor 7 (step ST109), has a predetermined time elapsed? It is determined whether or not (step ST112).

  After performing the operation stop process, that is, after outputting the speed command of the motor 7 based on the operation command to the motor control circuit 5 and outputting the speed command for stopping the motor 7 (step ST109). If the predetermined time set in advance has not elapsed (step ST112; No), the microcomputer 9 maintains the ON state of the transistor switch 13 / the output state of the speed command for stopping the motor 7. After performing the operation stop process, that is, after outputting the speed command of the motor 7 based on the operation command to the motor control circuit 5 and outputting the speed command for stopping the motor 7 (step ST109). When the predetermined time set in advance elapses (step ST112; Yes), the microcomputer 9 controls the transistor switch 13 to be turned off, that is, controls the current limit switching command to be turned off (step ST113), and shifts to the operation standby state. Then, the process returns to step ST102 and waits for an operation command from the outside such as a remote controller (not shown).

  Here, after performing the operation stop process, that is, after outputting the speed command for stopping the motor 7 to the motor control circuit 5 by stopping the output of the speed command of the motor 7 based on the operation command (step) ST109), the transistor switch 13 is turned off, that is, the current limit switching command is controlled to be turned off (step ST113), and a predetermined time until the operation is shifted to the operation standby state is rotated by inertia by performing the operation stop process. It is set assuming the time until the motor 7 is stopped. In this way, while the motor 7 is rotating by inertia, the current necessary for the rotation can be continuously supplied to the motor control circuit 5, and the motor 7 is in a stable stop state and is in an operation standby state. Can be migrated.

  As described above, according to the motor drive control device of the first embodiment, the motor drive control device includes the current limiting unit that limits the supply current to the motor control circuit, and the power supply current supplied to the motor control circuit during standby is Since the power supply current flowing through the motor control circuit when the same voltage as that during operation is applied is limited by a sufficiently small constant second current limit value, the types of ICs constituting the motor control circuit Thus, the standby power of the motor control circuit can be kept constant with a simple and inexpensive configuration without changing the setting / design, etc., and energy saving can be achieved.

  In addition, since a constant current is supplied to the motor control circuit during operation standby, it is possible to suppress inrush current flowing through the motor control circuit when starting motor operation from the operation standby state.

  In addition, when shifting to the operation standby state, after the elapse of a predetermined time set assuming the time from stopping the output of the motor speed command based on the operation command until the motor rotating due to inertia stops Since the current limit switching command is controlled to be turned off, the supply current to the motor control circuit is switched to the second current limit value, and the operation standby state is shifted. The current required for the rotation can be continuously supplied to the motor control circuit, and the motor can be shifted to the operation standby state with the motor stably stopped.

  In addition, when starting the motor operation, the current limit switching command is controlled to be on, and the current supplied to the motor control circuit is switched to the first current limit value. Outputs the motor speed command based on the operation command to the motor control circuit after the elapse of a predetermined time set for the time until the power supply current required for operation is stable and can be output. The processing required for normal operation is performed and the motor is started, so the motor is operated with the power supply current necessary for the operation of the motor control circuit being supplied when the motor is operated. Can start.

Embodiment 2. FIG.
FIG. 3 is a diagram of a configuration example of the motor drive control device according to the second embodiment. In addition, the same code | symbol is attached | subjected to the component which is the same as that of Embodiment 1, or equivalent, and the detailed description is abbreviate | omitted. In addition, since the operation start process and the transition process to the standby state of the motor drive control device according to the second embodiment are the same as those of the motor drive control device according to the first embodiment, description thereof is omitted here.

  As shown in FIG. 3, in the motor drive control device 200 according to the second embodiment, the current limiting unit 6 a includes an NPN-type bipolar transistor 10 a connected to a power supply path from the step-down power supply 4 to the motor control circuit 5. The constant voltage diode 14 connected between the base and the ground of the bipolar transistor 10a, the resistor 11a and the resistor 12a connected in series between the emitter and the base of the bipolar transistor 10a, and a switch (transistor switch) 13a for short-circuiting the resistor 12a And is configured. The resistor 11a is short-circuited by the resistor 11a, the resistor 12a, and the transistor switch 13a in accordance with the current limit switching command from the microcomputer 9, thereby reducing the base current value of the bipolar transistor 10 and the bias current value of the constant voltage diode 14. A current switching circuit 16 for switching is configured.

  Next, the operation of the motor drive control device 200 according to the second embodiment will be described.

  When the motor 7 is on standby, the microcomputer 9 outputs a speed command for stopping the motor 7 to the motor control circuit 5 and turns off the transistor switch 13a of the current switching circuit 16, that is, a current limit switching command. Control off. At this time, the base current value of the bipolar transistor 10a and the bias current value of the constant voltage diode 14 are determined depending on the combined resistance value of the resistor 11a and the resistor 12a.

  During operation of the motor 7, the microcomputer 9 outputs a speed command for driving the motor 7 to the motor control circuit 5 based on an operation command from the outside such as a remote controller (not shown) and switches the current. The transistor switch 13a of the circuit 16 is turned on, that is, the current limit switching command is turned on. At this time, the base current value of the transistor 10a and the bias current value of the constant voltage diode 14 are determined depending on the resistance value of the resistor 11a.

  Also in the present embodiment, the same effect as in the first embodiment can be obtained. During operation of the motor 7, the transistor switch 13 a of the current switching circuit 16 is turned on, that is, the current limit switching command is turned on, so that a power supply voltage necessary for the operation of the motor control circuit 5 can be applied. The bipolar transistor, which is the load current of the step-down power supply 4, is controlled by turning off the transistor switch 13 a of the current switching circuit 15, that is, by controlling the current limit switching command to be off when the motor 7 is on standby for operation. Since the power supply current of the motor control circuit 5 flowing to 10a is limited to the second current limit value sufficiently smaller than the current consumption value when the motor control circuit 5 is stopped, the standby power of the motor control circuit 5 is suppressed. be able to.

  Further, even when the motor 7 is stopped, that is, even when the impedance of the motor control circuit 5 during standby is different depending on the type of IC constituting the motor control circuit 5, the load current of the step-down power supply 4, that is, the motor control circuit Since the power supply current supplied to 5 is limited by a constant second current limit value, the load of the step-down power supply 4, that is, the standby power of the motor control circuit 5 is constant. That is, the standby power of the motor control circuit 5 can be kept constant without changing the setting / design depending on the type of IC constituting the motor control circuit 5 or the like.

  Further, since a constant current is supplied to the motor control circuit 5 during operation standby, the inrush current flowing into the motor control circuit 5 via the bipolar transistor 10a when starting the operation of the motor 7 from the operation standby state is suppressed. It becomes possible.

  In the example shown in FIG. 3, the resistor 12a is short-circuited by the transistor switch 13a to switch the base current value of the bipolar transistor 10a and the bias current value of the constant voltage diode 14, but the resistances of the resistors 11a and 12a are shown. The configuration may be such that the value is switched and the resistor 11 a is short-circuited to switch the base current value of the bipolar transistor 10 a and the bias current value of the constant voltage diode 14. The transistor switch 13a may be configured to use an insulating switch such as a photocoupler.

  As described above, according to the motor drive control device of the second embodiment, as in the first embodiment, the motor control circuit is provided with the current limiting means for limiting the current supplied to the motor control circuit. Since the power supply current supplied to the motor control circuit is limited to a constant value that is sufficiently smaller than the current consumption when the motor control circuit is stopped, the setting and design are changed depending on the type of IC that constitutes the motor control circuit. Therefore, the standby power of the motor control circuit can be kept constant with a simple and inexpensive configuration, and energy saving can be achieved.

  Further, as in the first embodiment, since a constant current is supplied to the motor control circuit during operation standby, the inrush current that flows through the motor control circuit when starting motor operation from the operation standby state is suppressed. Is possible.

  Similarly to the first embodiment, when shifting to the operation standby state, it is assumed a time from when the output of the motor speed command based on the operation command is stopped until the motor rotating due to inertia stops. After the elapse of the predetermined time set in the above, the current limit switching command is controlled to be turned off, the current supplied to the motor control circuit is switched to the second current limit value, and the motor is shifted to the operation standby state. While rotating, the current necessary for the rotation can be continuously supplied to the motor control circuit, and the operation can be shifted to the operation standby state with the motor stably stopped.

  Similarly to the first embodiment, when starting the motor operation, the current limit switching command is controlled to be turned on, and the current supplied to the motor control circuit is switched to the first current limit value before the motor operation. When a predetermined time is set, assuming that the power supply current required for the operation of the motor control circuit is stable and ready for output, the operation command is sent to the motor control circuit. A state in which the power supply current necessary for the operation of the motor control circuit is supplied when the motor is operated by performing the processing necessary for normal operation, such as outputting the speed command of the motor based on, and starting the motor operation Thus, the operation of the motor can be started.

  Note that the configuration shown in the above embodiment is an example of the configuration of the present invention, and can be combined with another known technique, and a part thereof is omitted without departing from the gist of the present invention. Needless to say, it is possible to change the configuration.

  1 AC commercial power supply, 2 rectifier circuit, 3 smoothing capacitor, 4 step-down power supply, 5 motor control circuit, 6, 6a current limiting means, 7 motor, 8 drive circuit (switching circuit), 9 microcomputer (control means), 10 bipolar Transistor (PNP type), 10a Bipolar transistor (NPN type), 11, 11a resistance, 12, 12a resistance, 13, 13a switch (transistor switch), 14 Constant voltage diode, 15 Base current switching circuit, 16 Current switching circuit, 100 , 200 Motor drive control device.

Claims (10)

A motor drive control device for reducing power consumption in a motor control circuit for controlling the motor drive circuit in an operation standby state in which operation of the motor is stopped,
A step-down power source for generating a low-voltage DC power source to be supplied to the motor control circuit from an AC commercial power source
Current limiting means for limiting a supply current to the motor control circuit;
Control means for controlling the motor control circuit and the current limiting means;
With
The control means limits the current supplied to the motor control circuit to a first current limit value at which the motor control circuit can operate during operation of the motor, and based on an operation command from the outside. Is output to the motor control circuit, and when the motor is stopped, the supply current to the motor control circuit is smaller than the current consumption value when the motor control circuit is stopped. The motor drive control device is characterized in that it is limited to a current limit value. The current limiting means includes
A bipolar transistor connected to a power supply path from the step-down power supply to the motor control circuit;
A base current switching circuit that switches a base current value of the bipolar transistor according to a current limit switching command output from the control means;
The motor drive control device according to claim 1, comprising: The bipolar transistor is a PNP type,
The base current switching circuit is
Two resistors connected in series between the base and ground of the bipolar transistor;
A switch that short-circuits one of the resistors based on the current limit switching command;
The motor drive control device according to claim 2, further comprising: The current limiting means includes
A bipolar transistor connected to a power supply path from the step-down power supply to the motor control circuit;
A constant voltage diode connected between a base and a ground of the bipolar transistor;
A current switching circuit that switches between a base current value of the bipolar transistor and a bias current value of the constant voltage diode according to a current limit switching command output from the control means;
The motor drive control device according to claim 1, comprising: The bipolar transistor is an NPN type,
The current switching circuit is
Two resistors connected in series between the emitter and base of the bipolar transistor;
A switch that short-circuits one of the resistors based on the current limit switching command;
The motor drive control device according to claim 4, further comprising:   6. The motor drive control device according to claim 3, wherein a resistance value of one of the two resistors short-circuited by the switch is larger than a resistance value of the other resistor.   When the control means shifts to the operation standby state, the current supplied to the motor control circuit after a predetermined time has elapsed since the output of the speed command of the motor to the motor control circuit based on the operation command is stopped. The motor drive control device according to claim 1, wherein the motor drive control device is switched to the second current limit value.   The predetermined time is set assuming a time from when the output of the speed command of the motor based on the operation command is stopped to when the motor rotating due to inertia stops. The motor drive control device according to claim 7.   When starting the operation of the motor, the control means switches the supply current to the motor control circuit to the first current limit value and then supplies the motor control circuit to the motor control circuit based on the operation command after a lapse of a predetermined time. The motor drive control device according to any one of claims 1 to 6, wherein output of the speed command of the motor is started.   During the predetermined time, the supply current to the motor control circuit is switched to the first current limit value, and then the power supply current necessary for the operation of the motor control circuit is stably output when the motor is operated. The motor drive control device according to claim 9, wherein the motor drive control device is set on the assumption of a time until it becomes possible.

Images