JP2013226045A - Motor control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an overvoltage caused by an induction voltage in the case where a motor is rotated by an external force while an inverter is stopped.SOLUTION: A motor control device comprises a second power source. In the case where a motor is rotated by an external force when a power supply voltage to be supplied from a power source to an inverter driver circuit or an inverter controller is cut off or reduced, the second power source generates a power supply voltage for the inverter driver circuit or the inverter controller from an induction DC voltage which is obtained by rectifying an induction voltage into a DC voltage. Therefore, the supply of the power supply voltage to the inverter driver circuit or the inverter controller is resumed and inverter control generating a braking force to the motor can be performed.

Description

  The present invention relates to a motor control device, and more particularly to a motor control device that performs inverter control, and relates to a motor control device that has improved a technique for preventing an overvoltage caused by an induced voltage of a motor when an external force is applied and the motor rotates.

A motor such as an air conditioner outdoor unit fan motor may be rotated by an external force such as an external wind. When the motor is rotated by an external force, the motor functions as a generator, and a voltage (induced voltage) Eo proportional to the number of rotations is generated in the following equation.
Eo = Ke · ω (Ke: power generation constant, ω: rotational speed)

  In a motor with a certain power generation constant Ke, when the external force increases and the motor speed increases, the induced voltage increases proportionally with the speed. Also, when the power generation constant Ke is increased, the induced voltage at the same rotational speed increases. When the induced voltage increases and becomes higher than the withstand voltage of the element used, element destruction due to overvoltage occurs. Therefore, in order to prevent overvoltage, it is necessary to suppress either the power generation constant Ke or the rotational speed ω.

  If the power generation constant Ke is reduced, the motor efficiency is lowered. Therefore, it is not preferable to prevent the overvoltage by suppressing the power generation constant Ke. A method of preventing overvoltage by suppressing the rotational speed ω can be realized by applying a braking force to the motor.

  Various methods for applying the braking force have been proposed, and there are roughly two methods, mechanical braking and electrical braking. However, since mechanical braking makes it difficult to reduce the size and cost of the device, there is a strong demand for electrical braking in recent years. As a method of performing electrical braking, those described in Patent Documents 1 to 3 are known.

  The methods described in Patent Document 1 and Patent Document 2 are methods that can apply electrical braking while preventing overvoltage due to regenerative energy by detecting regenerative energy from a motor and suppressing it by inverter control. is there. However, these methods are for decelerating and stopping the motor being driven by inverter control, and do not function when the motor being driven is rotated by an external force.

  That is, since the inverter circuit stop command is issued when the motor drive is stopped, the inverter circuit is not driven and a braking force cannot be applied to the motor.

  In particular, when the motor is rotated when the power supply voltage is not supplied to the motor control device, the motor control device does not operate, so that there is a problem that the inverter control itself cannot be performed.

  On the other hand, a method of applying a braking force by providing a protective circuit even when the motor is stopped has been proposed as in Patent Document 3.

  FIG. 8 is an explanatory diagram of a motor control device having a function of preventing overvoltage by providing a protection circuit.

  As shown in the figure, the motor control device includes a high-voltage DC power source 2 that generates a high-voltage DC voltage, a motor 3, switching elements S1 to S6 of three-phase upper and lower arms, and a free wheel diode D1 connected in antiparallel to them. To D6 and protection circuits C1 to C3 connected to the gates of the lower arm switching elements.

  When the motor is rotated by an external force when the power supply voltage is cut off, the lower arm switching element is turned on by the action of the protection circuit when the induced voltage exceeds a certain level.

  As a result, a current flows through the lower arm switching element, and a braking force is applied to the motor.

  However, in the method as described in Patent Document 3 described above, overvoltage is suppressed, but since the switching element is energized regardless of the magnitude of the current, the current increases as the rotational speed increases, and the overcurrent and There has been a problem that device destruction may occur due to temperature rise.

Japanese Patent Laid-Open No. 11-275889 JP 2007-135400 A JP-A-10-70897

  As described above, the prior arts of Patent Documents 1 and 2 apply braking force to the motor being driven, and cannot respond when a stop command for the inverter circuit is issued.

  Further, in a state where the power supply voltage is not supplied to the motor control device, the inverter control itself cannot be performed, so that there is a problem that the electric braking by the inverter control cannot be performed.

  Furthermore, the prior art of Patent Document 3 can generate a braking force even when an inverter circuit stop command is issued. However, since the switching element is always turned on, it depends on factors other than overvoltage such as overcurrent and high temperature. Destruction can occur.

  In addition, due to the problems described above, at present, when the motor is rotated by an external force when the motor driving is stopped, such as an air conditioner outdoor unit fan motor, the conventional technology cannot be applied, and the power generation of the motor The overvoltage is prevented by suppressing the constant Ke, which is a factor that the motor efficiency cannot be increased.

  The present invention has been made in view of the above-described points, and an object of the present invention is to control an inverter that generates a braking force when the motor is rotated even when a command to stop the inverter circuit is issued. The present invention is to provide a motor control device capable of achieving the above.

  In order to achieve the above object, a motor control device of the present invention includes an inverter circuit that receives a DC voltage, a motor connected to the inverter circuit, a DC power source that generates the DC voltage, and the inverter circuit. In a motor control device comprising an inverter drive circuit for driving and an inverter drive circuit power supply for generating a power supply voltage for the inverter drive circuit, the power supply voltage supplied from the inverter drive circuit power supply to the inverter drive circuit is cut off or reduced In some cases, a second inverter drive circuit power supply is provided that generates a power supply voltage of the inverter drive circuit from an induced DC voltage obtained by rectifying the induced voltage into a DC voltage when the motor rotates due to an external force.

  Another motor control device of the present invention includes an inverter circuit having a DC voltage as an input, a motor connected to the inverter circuit, a DC power source that generates the DC voltage, and an inverter drive that drives the inverter circuit. In a motor control device comprising: a circuit; an inverter control unit that sends a control signal to the inverter drive circuit; and an inverter control unit power source that generates a power supply voltage of the inverter control unit, from the inverter control unit power source to the inverter control unit A second inverter control unit power supply that generates a power supply voltage of the inverter control unit from an induced DC voltage obtained by rectifying the induced voltage into a DC voltage when the motor rotates due to an external force when the power supply voltage supplied to is cut off or lowered It is provided with.

  Another motor control device of the present invention includes an inverter circuit having a DC voltage as an input, a motor connected to the inverter circuit, an inverter drive circuit for driving the inverter circuit, and a power supply voltage for the inverter drive circuit. An inverter drive circuit power supply that generates a control signal, an inverter control unit that sends a control signal to the inverter drive circuit, a relay, and when the power supply voltage to the inverter drive circuit is not supplied because the relay is open, the motor When rotated by an external force, there is provided a relay opening releasing means for releasing the opening of the relay.

  Further, another motor control device of the present invention includes an inverter circuit having a DC voltage as an input, a motor connected to the inverter circuit, an inverter drive circuit for driving the inverter circuit, and a control signal for the inverter drive circuit. The inverter control unit for generating the power supply voltage of the inverter control unit, the relay, and the motor is operated when the power supply voltage to the inverter control unit is not supplied because the relay is open. When rotated by an external force, there is provided a relay opening releasing means for releasing the opening of the relay.

  According to the motor control device of the present invention, even when a stop command for the inverter circuit is issued, there is an effect that the inverter control for causing the motor to generate a braking force can be performed when the motor is rotated.

  Furthermore, regenerative energy can be suppressed, and braking force can be generated in the motor while preventing overvoltage due to regenerative energy.

  Even when the power supply voltage is not supplied to the inverter control unit or inverter drive unit, etc., if the motor is rotated by an external force or the like, the supply of the power supply voltage is resumed and the inverter control that generates the braking force to the motor is performed. It becomes possible.

  In addition, switching element operation can be controlled within a range of current and temperature that does not cause element breakdown, and overvoltage while preventing breakdown due to factors such as overcurrent and high temperature that could occur in the prior art. Can be suppressed.

  Further, since overvoltage breakdown is less likely to occur when an external force is applied by suppressing overvoltage, a motor having a large power generation constant Ke can be employed even in the same use environment as compared with a case where overvoltage suppression is not performed. Thereby, the motor efficiency can be improved.

The block diagram which shows Example 1 of the motor control apparatus of this invention. The block diagram which shows Example 2 of the motor control apparatus of this invention. The block diagram which shows Example 3 of the motor control apparatus of this invention. The block diagram which shows Example 4 of the motor control apparatus of this invention. The block diagram which shows Example 5 of the motor control apparatus of this invention. The figure which showed the structural example of the motor drive circuit power supply at the time of a stop in Example 5 of the motor control apparatus of this invention. The block diagram which shows Example 6 of the motor control apparatus of this invention. Explanatory drawing of a prior art.

  Even when a command to stop the inverter circuit is issued, it is possible to realize that the inverter can be controlled to generate a braking force on the motor when the motor is rotated.

  A first embodiment of the present invention will be described with reference to FIG.

  In FIG. 1, an inverter circuit 1 converts a DC voltage input from a DC power supply 2 into an AC voltage and outputs the AC voltage to a motor 3. The inverter circuit 1 is generally composed of six switching elements and a free-wheeling diode connected in antiparallel thereto, and an IGBT, a MOS transistor, a bipolar transistor or the like is used as the switching element.

  The inverter drive circuit 4 inputs a control signal from the inverter control unit 5 and drives the inverter circuit 1 by applying a gate voltage corresponding to the control signal to the gate unit of each switching element. The inverter circuit 1 and the inverter drive circuit 4 may be, for example, a high voltage one-chip inverter IC in which the inverter circuit 1 and the inverter drive circuit 4 are integrated on one chip.

  The inverter control unit 5 is formed by a microcomputer, a DSP (digital signal processor), or the like. Further, a speed calculation means 51, a start command receiving means 53, a stop speed control means 52, a control signal output section 54, and the like, which will be described later, use a microcomputer software process and a port, so that the microcomputer that is the inverter control section 5 is used. It can be realized inside the computer.

  The rotational position detector 6 outputs rotational position information VH of the motor 3 to the speed calculation means 51. The rotational position detection unit 6 uses, for example, a position sensor such as a Hall element or Hall IC, and outputs rotational position information VH having a predetermined positional relationship with the induced voltage of the motor 3 as a voltage value.

  The speed calculation means 51 calculates the rotational speed N of the motor 3 from the received rotational position information VH and outputs it to the stop speed control means 52.

  Further, a start command receiving means 53 for receiving a start command Vsp for the inverter circuit 1 is provided, and the start command receiving means 53 stops the start command signal Vs as a signal for transmitting whether the start command Vsp is an operation command or a stop command. Output to the hour speed control means 52.

The speed control means 52 at the time of stop is a current command value I ^* for decelerating the motor 3 when the start command signal Vs is a stop command and when the rotation speed N of the motor 3 becomes equal to or higher than a preset rotation speed ^. Is output to the control signal output unit 54.

  When the start command signal Vs is an operation command, the inverter control unit 5 performs normal inverter control. When the start command signal Vs is a stop command and the rotational speed N of the motor 3 is smaller than a predetermined value, the inverter circuit 1 maintains the stop state.

The control signal output unit 54 outputs control signals UT to WB such as a PWM (pulse width modulation) signal to the inverter drive circuit 4 so that the current command value I ^* is output to the motor 3.

  In addition, some components in the present invention such as the inverter drive circuit 4, the inverter control unit 5, and the inverter circuit 1 may be built in the motor 3.

  With the above configuration, even when a stop command is issued to the inverter circuit, when the motor is rotated by an external force or the like, a braking force can be generated in the motor by inverter control.

  In addition, since the induced voltage can be suppressed by generating a braking force in the motor, it is possible to prevent overvoltage breakdown during motor rotation due to external force.

  Furthermore, by suppressing the overvoltage, a motor having a large power generation constant Ke can be adopted even in the same usage environment, and therefore, the motor efficiency can be improved.

  A second embodiment of the present invention will be described with reference to FIG.

  The configuration of FIG. 2 includes a motor current information detection unit 7 in addition to the configuration of FIG. 1, and the stop speed control means 52 includes a motor current detection means 521, a speed command calculation means 522, a speed And a control means 523. The rest of the configuration is the same as in FIG. 1. Even when a command to stop the inverter circuit is issued as in the first embodiment, if the motor is rotated by an external force or the like, a braking force is generated by the inverter control. Can be made.

The motor current information detection unit 7 includes, for example, a current sensor, a resistor, and the like, acquires information for detecting a current flowing through the motor as a voltage value, and outputs it as motor current information VIm to the motor current detection unit 521. It has become. The motor current detection unit 521 detects the motor current by calculating the motor current information VIm, and outputs it to the speed command calculation unit 522 as the motor current detection value Im. When the motor current detection value Im exceeds a preset current value, the speed command calculation means 522 calculates the motor rotation speed so that it is close to the set current value, and the speed command value N ^{* is used} as the speed command value N ^*. It outputs to the control means 523.

  By setting the set value at this time to a current at which the switching element does not cause overcurrent destruction, overcurrent destruction can be prevented.

The speed control means 523 calculates the first voltage adjustment value Iq ^* so that the deviation between the speed command value N ^* and the rotation speed N is close to zero, and the control signal is based on the first voltage adjustment value Iq ^*. The output unit 54 is configured to output control signals UT to WB, whereby the motor rotational speed N is controlled to be close to the speed command value N ^* .

Here, the first voltage adjustment value Iq ^* is a command value of the q-axis current (motor current component orthogonal to the magnetic flux), and the braking force torque can be controlled by adjusting the q-axis current.

  With the configuration as described above, it is possible to prevent the current that flows when the braking force is generated in the motor from being overcurrent, and to prevent the overcurrent destruction of the switching element or the like during motor braking.

  A third embodiment of the present invention will be described with reference to FIG.

  3 is provided with a motor temperature information detection unit 8 in addition to the configuration of FIG. 1. The stop speed control means 52 includes a motor temperature detection means 524, a speed command calculation means 522, a speed And a control means 523. The rest of the configuration is the same as in FIG. 1. Even when a command to stop the inverter circuit is issued as in the first embodiment, if the motor is rotated by an external force or the like, a braking force is generated by the inverter control. Can be made.

  In the present embodiment, similarly to the motor current in the second embodiment, the motor temperature is detected and the rotational speed is controlled to keep the temperature below a predetermined value set in advance.

  The motor temperature information detection unit 8 is composed of, for example, a temperature sensor such as a thermocouple or a thermistor, acquires information for detecting the motor temperature as a voltage value, and outputs the information as motor temperature information VTm to the motor temperature detection means 524. It is like that.

  The motor temperature detection means 524 detects the motor temperature by calculating the motor temperature information VTm, and outputs it to the speed command calculation means 522 as the motor temperature detection value Tm.

The speed command calculation means 522 calculates the rotation speed of the motor so as to be close to the set temperature when the detected motor temperature Tm exceeds a preset temperature, and the speed control means is set as the speed command value N ^*. To 523. The set value at this time is set to a temperature at which the component parts are not destroyed by high temperature.

The speed control means 523 calculates the first voltage adjustment value Iq ^* that is the q-axis current command value so that the deviation between the speed command value N ^* and the rotation speed N is close to zero, and this first voltage adjustment value. Based on Iq ^* , the control signal output unit 54 outputs the control signals UT to WB, and the rotational speed N of the motor is controlled to be close to the speed command value N ^* .

  With the configuration as described above, it is possible to prevent the motor from becoming excessively hot when a braking force is generated in the motor, and to prevent thermal destruction of components such as switching elements.

  A fourth embodiment of the present invention will be described with reference to FIG.

  4 is provided with a DC voltage detection unit 9, regenerative energy detection means 55, and regenerative energy control means 56 in addition to FIG. 1, and the other configurations are the same as those in FIG.

  When the present invention is applied to a motor for home appliances such as an air conditioner, the DC power supply 2 is generally composed of a rectifier circuit that rectifies an AC voltage obtained from a commercial AC power supply. When the motor is rotated by an external force or the like to generate regenerative energy, the voltage of the DC power supply 2 rises to a voltage equal to or higher than the voltage value generated by the DC power supply 2.

  In the present embodiment, the DC voltage detector 9 detects the regenerative energy, and therefore detects the voltage value Vd of the DC power source 2 as information and outputs it to the regenerative energy detector 55.

  In order to detect regenerative energy, for example, there is a method of acquiring information such as a DC power value and a DC current value of the DC power supply 2.

  The regenerative energy detection means 55 calculates regenerative energy from the voltage value Vd of the DC power supply 2. The value calculated by the regenerative energy detection means 55 is output to the regenerative energy control means 56 as a regenerative energy detection value Er.

The regenerative energy control means 56 calculates the second voltage adjustment value Id ^* so that the regenerative energy detection value ER is close to zero, and the second voltage adjustment value Id ^* is output to the control signal output unit 54. .

Here, the second voltage adjustment value Id ^* is a command value of a d-axis current (a motor current component parallel to the magnetic flux), and the regenerative energy can be controlled by adjusting the d-axis current.

Similarly to the first embodiment, the first voltage adjustment value Iq ^* is output as a current command value from the stop speed control means 52 to the control signal output unit 54. For example, as in the second embodiment, the stop By configuring the hourly speed control means 52, a q-axis current command value that prevents overcurrent is output to the control signal output unit 54.

The control signal output unit 54 outputs the control signals UT to WB based on the received first voltage adjustment value Iq ^* and second voltage adjustment value Id ^* .

  With the above configuration, the regenerative energy ER is controlled to be close to zero, so that the braking force can be generated in the motor so as to prevent the power supply voltage from rising due to the induced voltage.

  A fifth embodiment of the present invention will be described with reference to FIG.

  The configuration of FIG. 5 is the same as that of FIG. 1 except that the inverter drive circuit power supply 10 supplies a power supply voltage to the inverter drive circuit 4, the inverter control unit power supply 11 supplies the power supply voltage to the inverter control unit 5, and the second inverter. A drive circuit power source 12, a second inverter control unit power source 13, and backflow prevention units 14 and 15 are added, and the other configurations are the same as those in FIG.

  The second inverter drive circuit power supply 12 is configured as means for supplying the power supply voltage to the inverter drive circuit 4 when the supply of the power supply voltage from the inverter drive circuit power supply 10 to the inverter drive circuit 4 is cut off or lowered.

  The second inverter drive circuit power supply 12 is connected to the inverter drive circuit power supply 10, the DC voltage input side of the inverter circuit 1, and the inverter drive circuit 4, and no power supply voltage is supplied from the inverter drive circuit power supply 10. In this case, a predetermined voltage is generated based on the induced DC voltage supplied from the DC voltage input side of the inverter circuit 1 and supplied to the inverter drive circuit 4.

  Here, the induced DC voltage is obtained by converting the induced voltage generated when the motor is rotated by an external force into a DC voltage. In the present embodiment, the induced DC voltage is an AC voltage, and the induced voltage is a DC power supply. Are converted to DC voltage automatically by the action of the smoothing capacitor provided as a part of the circuit and the free-wheeling diode provided in the inverter circuit 1, and can be obtained without newly providing a power supply circuit for conversion to DC. Yes.

  The backflow prevention unit 14 includes a rectifying element such as a diode, a switching element, a relay, or the like, and prevents the voltage generated by the second inverter drive circuit power supply 12 from flowing back to the inverter drive circuit power supply 10 side.

  In addition, the second inverter control unit power supply 13 and the backflow prevention unit 15 have the same configuration as that of the second inverter drive circuit power supply 12 and the backflow prevention unit 14 as described above, so that the inverter control unit power supply 11 When the motor is rotated when the supply of the power supply voltage from is cut off or lowered, it can be configured as means for supplying power to the inverter control unit 5.

  FIG. 6 shows a configuration example of the second inverter drive circuit power supply 12.

  The second inverter drive circuit power supply 12 in FIG. 6 includes resistors R1 to R3, MOS transistors M1 and M2, and a Zener diode DZ.

  When the power supply voltage is not supplied from the inverter drive circuit power supply 10, the MOS transistor M1 is turned off. At this time, when the motor is rotated by an external force, an induced DC voltage is applied, and the MOS transistor M2 is turned on. As a result, the induced DC voltage is output as the inverter drive circuit power supply voltage via the MOS transistor M2. When the potential at the point a becomes equal to or higher than the breakdown voltage of the Zener diode DZ, a constant DC voltage is output as the inverter drive circuit power supply voltage. The breakdown voltage of the Zener diode DZ may be set to an appropriate value as the power supply voltage for the inverter drive circuit 4. In addition, by setting the breakdown voltage of the Zener diode DZ at this time to an appropriate value as the power supply voltage of the inverter control unit 5, the second inverter control unit power supply 13 can be implemented with the same configuration.

  Further, when the power supply voltage is supplied from the inverter drive circuit power supply 10, the output of the voltage is stopped when the MOS transistor M 1 is turned on and the MOS transistor M 2 is turned off. 12 does not generate the power supply voltage to the inverter drive circuit 4 when the inverter drive circuit power supply 10 supplies the power supply voltage to the inverter drive circuit 4.

  As described above, the power supply voltage of the inverter drive circuit power supply 10 is supplied by configuring the second inverter drive circuit power supply 12 and applying it to the second inverter drive circuit power supply 12 in the motor control device of FIG. Even if the motor is rotated by an external force when there is no power, the power supply voltage to the inverter drive circuit 4 can be supplied.

  The method of generating the power supply voltage of the inverter drive circuit 4 and the inverter control unit 5 in FIG. 5 is a method of obtaining the DC voltage generated by the DC power supply 2 by level conversion, a method of obtaining the AC power supply by rectifying, and an inverter drive circuit. 4 and various methods such as a method of obtaining the other power supply voltage by converting the level from one of the power supply voltages of the inverter control unit 5.

  For example, when the level of one power supply voltage is converted to generate the other power supply voltage, only the second power supply that generates the power supply voltage that is the generation base may be installed. Further, when the supply of the power supply voltage is cut off or lowered, for example, the presence / absence of the second power supply and the installation position change depending on the position and number of relays that cut off the supply. By installing a power supply, it is possible to supply a power supply voltage to the inverter drive circuit 4 and the inverter control unit 5 when the motor is rotated by an external force.

  In addition, when the supply of the power supply voltage to the inverter drive circuit 4 or the inverter control unit 5 is cut off or lowered, the relay is opened so that the supply of the power supply voltage is not performed, the power failure or the failure There are abnormal times.

  In addition, the present embodiment is configured to generate a braking force on the motor by inverter control when the motor is rotated by an external force or the like even when an inverter circuit stop command is issued as in the first to fourth embodiments. ing.

  According to the embodiment of the present invention, the power supply voltage is supplied to the inverter drive circuit 4 and the inverter control unit 5 when the motor is rotated by an external force even when the power supply voltage is not supplied from the inverter drive circuit power supply 10 or the inverter control unit power supply 11. Therefore, a braking force can be generated in the motor.

  A sixth embodiment of the present invention will be described with reference to FIG.

  FIG. 7 shows an inverter drive circuit power supply 10 that supplies power supply voltage to the inverter drive circuit 4, an inverter control unit power supply 11 that supplies power supply voltage to the inverter control unit 5, a relay RY, and a relay release. Release means 57 is added, and the rest of the configuration is the same as in FIG.

  The relay release releasing means 57 is configured to receive the motor rotation speed N and the start command signal Vs. If the start command Vsp is a stop command and the rotation speed is equal to or greater than a certain value, the relay RY release means 57 A relay open / close signal VR is output so as to release the opening.

  Thereby, even when the supply of the power supply voltage to the inverter drive circuit is interrupted, the supply of the power supply voltage can be resumed if the motor rotates.

  This embodiment is configured to generate a braking force to the motor by inverter control when the motor is rotated by an external force or the like even when a command to stop the inverter circuit is issued as in the first to fourth embodiments. Yes.

  According to the embodiment of the present invention, even when the power supply voltage from the inverter drive circuit power supply 10 is cut off by the relay RY, the cut-off is released and the power supply voltage is supplied to the inverter drive circuit 4 when the motor is rotated by an external force. Therefore, a braking force can be generated in the motor.

  The relay release canceling means 57 can be realized inside the inverter control unit 5 as in the configuration of FIG. 7, but can also be realized by, for example, a higher order command unit that outputs a start command Vsp.

  In the configuration of FIG. 7 in the present embodiment, the relay RY is provided between the inverter drive circuit power supply 10 and the inverter drive circuit 4, but the inverter drive circuit power supply 10 to the inverter drive circuit is opened by opening the relay RY. When the supply of the power supply voltage to 4 is not performed, the position of the relay RY may be anywhere.

  Further, although the relay RY of the present embodiment cuts off the supply of the power supply voltage to the inverter drive circuit 4, the same configuration is applied to the relay that cuts off the power supply voltage supply to the inverter control unit 5. By doing so, supply of a power supply voltage can be restarted at the time of motor rotation.

DESCRIPTION OF SYMBOLS 1 Inverter circuit 2 DC power supply 3 Motor 4 Inverter drive circuit 5 Inverter control part 6 Rotation position detection part 7 Motor current information detection part 8 Motor temperature information detection part 9 DC voltage detection part 10 Inverter drive circuit power supply 11 Inverter control part power supply 12th 2 Inverter drive circuit power supply 13 Second inverter control section power supplies 14 and 15 Backflow prevention section 51 Speed calculation means 52 Stop speed control means 53 Start command receiving means 54 Control signal output section 55 Regenerative energy detection means 56 Regenerative energy control means 57 Relay release release means 521 Motor current detection means 522 Speed command calculation means 523 Speed control means 524 Motor temperature detection means RY Relay M1, M2 MOS transistors R1 to R3 Resistor DZ Zener diodes S1 to S6 Switching elements D1 to D6 Free-wheeling diode C1 ˜C3 Protection circuit Vsp Start command Vs Start command signal VH Rotation position information N Speed I ^* Current command value UT, VT, WT, UB, VB, WB Control signal VIm Motor current information Im Motor current detection value N ^* Speed command value Iq ^* first voltage adjustment value VTm motor temperature information Tm motor temperature detection value Vd ^* voltage value Er of DC power supply 2 regenerative energy detection value Id ^* second voltage adjustment value

Claims (6)

An inverter circuit that receives a DC voltage, a motor connected to the inverter circuit, a DC power source that generates the DC voltage, an inverter drive circuit that drives the inverter circuit, and a power supply voltage for the inverter drive circuit In a motor control device comprising an inverter drive circuit power supply
When the motor rotates due to an external force when the power supply voltage supplied from the inverter drive circuit power supply to the inverter drive circuit is cut off or lowered, the power supply voltage of the inverter drive circuit is obtained from the induced DC voltage obtained by rectifying the induced voltage into a DC voltage. A motor control device having a second inverter drive circuit power supply to be generated. An inverter circuit that receives a DC voltage, a motor connected to the inverter circuit, a DC power source that generates the DC voltage, an inverter drive circuit that drives the inverter circuit, and a control signal to the inverter drive circuit In a motor control device comprising an inverter control unit and an inverter control unit power source for generating a power supply voltage of the inverter control unit,
When the motor is rotated by an external force when the power supply voltage supplied from the inverter control unit power supply to the inverter control unit is cut off or lowered, the power supply voltage of the inverter control unit is derived from the induced DC voltage obtained by rectifying the induced voltage into a DC voltage. A motor control device comprising: a second inverter control unit power supply for generating The motor control device according to claim 1,
The second inverter drive circuit power supply generates the power supply voltage of the inverter drive circuit only when the power supply voltage supplied from the inverter drive circuit power supply to the inverter drive circuit is cut off or lowered. Motor control device. The motor control device according to claim 2,
The second inverter control unit power supply generates a power supply voltage for the inverter control unit only when a power supply voltage supplied from the inverter control unit power supply to the inverter control unit is cut off or lowered. Motor control device.   An inverter circuit having a DC voltage as input, a motor connected to the inverter circuit, an inverter drive circuit for driving the inverter circuit, an inverter drive circuit power supply for generating a power supply voltage of the inverter drive circuit, and the inverter drive When the motor is rotated by an external force when the power supply voltage to the inverter drive circuit is not supplied because the relay is open and the inverter drive circuit sends a control signal to the circuit, the relay is opened A motor control device comprising relay release release means for releasing   An inverter circuit having a DC voltage as an input; a motor connected to the inverter circuit; an inverter drive circuit that drives the inverter circuit; an inverter control unit that sends a control signal to the inverter drive circuit; When the motor is rotated by an external force when the power source voltage is not supplied to the inverter control unit due to the relay being open and the inverter control unit power source generating the power source voltage, the relay is opened. A motor control device comprising relay release release means for releasing