CN111865170A - Motor control device - Google Patents
Motor control device Download PDFInfo
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- CN111865170A CN111865170A CN202010310176.2A CN202010310176A CN111865170A CN 111865170 A CN111865170 A CN 111865170A CN 202010310176 A CN202010310176 A CN 202010310176A CN 111865170 A CN111865170 A CN 111865170A
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- voltage
- switching element
- motor
- signal line
- control device
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
- H02P23/04—Arrangements or methods for the control of AC motors characterised by a control method other than vector control specially adapted for damping motor oscillations, e.g. for reducing hunting
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P3/00—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters
- H02P3/06—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter
- H02P3/18—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter for stopping or slowing an ac motor
Abstract
The invention provides a motor control device, which can reduce vibration and noise of a motor. A motor control device (100) is provided with an inverter circuit (1), a control unit (2), a signal line (3), a diode (4), and a first switching element (5). A speed command signal (Vsp) is input to one end (3a) of the signal line. The other end (3b) of the signal line is connected to the control unit. The diode is connected to the signal line. A speed command signal is input to an anode (A) of the diode. The diode outputs a speed command signal from the cathode (K) to the control unit. The first switching element operates in accordance with a Voltage Difference (VD) between a first voltage (V1) which is a voltage of the anode side portion of the signal line and a second voltage (V2) which is a voltage of the cathode side portion of the signal line. The control unit stops the operation of the inverter circuit in response to the first switching element operating.
Description
Technical Field
The present invention relates to a motor control device.
Background
In order to drive a motor efficiently, a motor control device is known which performs advance angle control in which the phase of a motor drive voltage is advanced with respect to the phase of a motor induced voltage. Specifically, in order to drive the motor efficiently, it is necessary to match the phase of the motor drive current with the phase of the motor induced voltage. On the other hand, the phase of the motor drive current is delayed from the phase of the motor drive voltage. The motor control device that performs advance angle control advances the phase of the motor drive voltage so that the phase of the motor drive current coincides with the phase of the motor induced voltage.
Specifically, the motor control device includes an inverter circuit that generates a motor drive voltage. The inverter circuit is connected to a dc power supply, and a dc voltage is applied to the inverter circuit from the dc power supply. The inverter circuit has a plurality of switching elements. The motor control device controls the timing of turning on and off the plurality of switching elements of the inverter circuit, and generates a motor drive voltage from the direct-current voltage. The motor control device controls the timing of turning on and off the plurality of switching elements of the inverter circuit so as to advance the phase of the motor drive voltage.
More specifically, a speed command signal is input to the motor control device from a control device of the actual machine on which the motor and the motor control device are mounted. The speed command signal is an analog voltage signal indicating the rotational speed of the motor. The motor control device controls the timing of turning on and off the plurality of switching elements of the inverter circuit in accordance with the speed command signal.
For example, patent document 1 discloses a motor drive device that performs advance angle control. The motor drive device of patent document 1 has a correspondence table between a rotation speed command and a lead angle value (fig. 3 of patent document 1). The correspondence table specifies a correspondence between discrete values of the rotational speed command and discrete lead angle values. When a rotation speed command is input, the motor drive device of patent document 1 refers to the correspondence table to set a lead angle value corresponding to the value of the rotation speed command. The timing of turning on and off the plurality of switching elements of the inverter circuit is controlled based on the set lead angle value. Further, the motor drive device of patent document 1 corrects the lead angle value in accordance with the actual motor rotation speed when the motor rotation speed command differs from the actual motor rotation speed. Specifically, the motor drive device of patent document 1 sequentially sets the lead angle value between the lead angle value corresponding to the value of the rotation speed command and the lead angle value corresponding to the actual rotation speed of the motor among the lead angle values in the correspondence table, and changes the lead angle value in stages.
Patent document 1: japanese patent laid-open publication No. 2017-209017
However, in the motor drive device of patent document 1, when the voltage value of the rotation speed command is rapidly decreased, a voltage of an opposite phase based on the motor induced voltage may be applied to the dc power supply. Specifically, the motor drive device of patent document 1 controls the timing of turning on and off the plurality of switching elements of the inverter circuit in accordance with a rapid decrease in the voltage value of the rotation speed command. However, the rotation speed of the rotor does not immediately respond to a rapid decrease in the voltage value of the rotation speed command due to the inertial force acting on the rotor of the motor. As a result, there is a possibility that a deviation occurs between the timing of turning on and off the plurality of switching elements of the inverter circuit and the phase of the motor induced voltage, and a voltage of an opposite phase may be applied to the dc power supply.
Although the motor drive device of patent document 1 changes the lead angle value in a stepwise manner when the rotation speed command of the motor differs from the actual rotation speed of the motor, even if the lead angle value of the correspondence table is changed in a stepwise manner, there is a possibility that a deviation occurs between the timing of turning on and off the plurality of switching elements of the inverter circuit and the phase of the motor induced voltage, and a voltage of an opposite phase is applied to the dc power supply, because the lead angle value of the correspondence table is a fixed value.
When a voltage of opposite phase is applied to the dc power supply, a braking force against the rotation of the motor is generated, and as a result, the rotor vibrates. When the rotor vibrates, a rotating member such as a fan attached to the rotor vibrates, and noise is generated.
Disclosure of Invention
The present invention has been made in view of the above problems. The invention aims to provide a motor control device capable of reducing vibration and noise of a motor.
An exemplary motor controller of the present invention controls a motor. The motor control device includes an inverter circuit, a control unit, a signal line, a diode, and a first switching element. The inverter circuit generates a drive voltage that drives the motor. The control unit controls the inverter circuit in accordance with a speed command signal indicating a rotational speed of the motor. The signal line has one end and the other end. Inputting the speed instruction signal to the one end of the signal line. The other end of the signal line is connected to the control unit. The diode has an anode and a cathode. The diode is connected to the signal line. The speed command signal is input from the anode to the diode. The diode outputs the speed command signal from the cathode to the control unit. The first switching element operates in accordance with a voltage difference between a first voltage that is a voltage of the anode-side portion of the signal line and a second voltage that is a voltage of the cathode-side portion of the signal line. The control unit stops the operation of the inverter circuit in response to the first switching element operating.
According to the illustrated invention, vibration and noise of the motor can be reduced.
Drawings
Fig. 1 is a diagram showing a configuration of a motor control device according to embodiment 1 of the present invention.
Fig. 2 is a diagram showing the configurations of an inverter circuit and a motor according to embodiment 1 of the present invention.
Fig. 3 is a diagram showing the configuration of a motor control device according to embodiment 2 of the present invention.
Fig. 4 is a diagram showing a configuration of a motor control device according to embodiment 3 of the present invention.
Fig. 5 is a diagram showing the configuration of a motor control device according to embodiment 4 of the present invention.
Description of the reference symbols
1: an inverter circuit; 2: a control unit; 3: a signal line (first signal line); 3 a: one end; 3 b: the other end; 4: a diode; 5: a switching element (first switching element); 6: a capacitor circuit (first capacitor circuit); 7: a filter circuit; 8: disconnecting the power supply for the terminal; 9: a switching element (second switching element); 31: a first section (input line); 32: a second section (output line); 71: a resistance circuit; 72: a capacitor circuit (second capacitor circuit); 100: a motor control device; 200: a motor; a: an anode; DC: a direct current power supply; k: a cathode; vsp: a speed command signal.
Detailed Description
Hereinafter, exemplary embodiments of the present invention will be described with reference to the drawings. However, the present invention is not limited to the following embodiments. Note that description of overlapping portions may be omitted as appropriate. In the drawings, the same or corresponding portions are denoted by the same reference numerals, and description thereof will not be repeated.
[ embodiment 1]
A motor control device 100 according to the present embodiment will be described with reference to fig. 1. Fig. 1 is a diagram showing a configuration of a motor control device 100 according to the present embodiment. As shown in fig. 1, the motor control device 100 controls a motor 200. The motor control device 100 includes an inverter circuit 1, a control unit 2, a signal line 3, a diode 4, and a switching element 5. The switching element 5 is an example of a first switching element. In the following description, the signal line 3 is referred to as a "first signal line 3".
The motor control device 100 of the present embodiment further includes first to third terminals 101 to 103. The motor control device 100 of the present embodiment further includes a first power line 111, a second power line 112, and a GND line 113. The first power line 111, the second power line 112, and the GND line 113 are wiring patterns formed on a substrate, for example.
The first terminal 101 is connected to a first power line 111. When motor control device 100 and motor 200 are mounted on an actual machine, first terminal 101 is DC-connected to a DC power supply provided in the actual machine.
When the motor control device 100 and the motor 200 are mounted on the actual machine, the second terminal 102 and the third terminal 103 are connected to an actual machine side control device 300 provided in the actual machine. The real-machine-side control device 300 inputs the speed command signal Vsp to the second terminal 102. The speed command signal Vsp is a signal indicating the rotation speed of the motor 200. The third terminal 103 is connected to the GND line 113. The GND line 113 is connected to the ground terminal.
The inverter circuit 1 generates a drive voltage for driving the motor 200. Specifically, the inverter circuit 1 includes a plurality of switching elements. A DC voltage is applied from the DC power supply DC to the inverter circuit 1. The plurality of switching elements of the inverter circuit 1 operate to generate a drive voltage from the dc voltage. A driving voltage is applied to the motor 200. The motor 200 rotates according to the driving voltage.
Specifically, inverter circuit 1 is connected to first power line 111 and second power line 112. The inverter circuit 1 is connected to the first terminal 101 via a first power line 111. The inverter circuit 1 is connected to the ground via a second power line 112. More specifically, the inverter circuit 1 is connected to the GND line 113 via the second power line 112, and is connected to the third terminal 103 via the second power line 112 and the GND line 113. When the motor control device 100 and the motor 200 are mounted on the actual machine, the inverter circuit 1 is electrically connected to the DC power supply DC via the first power line 111 and the first terminal 101.
The control unit 2 controls the inverter circuit 1 based on the speed command signal Vsp. Specifically, the control unit 2 controls the plurality of switching elements of the inverter circuit 1 based on the speed command signal Vsp. As a result, a drive voltage corresponding to the speed command signal Vsp is applied from the inverter circuit 1 to the motor 200, and the motor 200 rotates at a rotation speed corresponding to the speed command signal Vsp.
In detail, the speed command signal Vsp is an analog voltage signal. When the rotation speed of the motor 200 is to be increased, the actual-machine-side controller 300 increases the voltage value of the speed command signal Vsp. The higher the voltage value of the speed command signal Vsp, the higher the rotation speed of the motor 200. When the rotation speed of the motor 200 is to be reduced, the actual-machine-side controller 300 decreases the voltage value of the speed command signal Vsp. The lower the voltage value of the speed command signal Vsp, the slower the rotation speed of the motor 200.
The control unit 2 is an Integrated Circuit such as a logic IC (Integrated Circuit) or an ASIC (application specific Integrated Circuit). In particular, the integrated circuit has logic circuits. Further, the integrated circuit is enclosed in a package. The speed command signal Vsp is input to the logic circuit via an input terminal provided in the package. The logic circuit performs a logic operation in accordance with the speed command signal Vsp. As a result, the logic circuit outputs a control signal for controlling the plurality of switching elements of the inverter circuit 1. The control signal is output to the inverter circuit 1 via an output terminal provided in the package.
The control unit 2 is not limited to a logic circuit. The control Unit 2 may include a processor such as a CPU (Central Processing Unit) or an MPU (Micro Processing Unit), and a semiconductor Memory such as a RAM (Random Access Memory) or a ROM (Read Only Memory). The control unit 2 may have a nonvolatile semiconductor memory in which data can be written and data can be erased. The processor executes a control program stored in the semiconductor memory to control the inverter circuit 1. The control unit 2 is, for example, a microcomputer.
The control unit 2 of the present embodiment performs advance angle control for advancing the phase of the drive voltage relative to the phase of the induced voltage generated from the winding of the motor 200. This allows the phase of the drive current flowing through the winding of the motor 200 to match the phase of the induced voltage, thereby efficiently driving the motor 200.
The control unit 2 of the present embodiment has a speed command input terminal 21 and a GND terminal 22. The speed command input terminal 21 is connected to the first signal line 3. The GND terminal 22 is connected to the GND line 113.
Here, the inverter circuit 1 and the motor 200 will be described with reference to fig. 2. Fig. 2 is a diagram showing the configurations of the inverter circuit 1 and the motor 200 of the present embodiment.
As shown in fig. 2, motor 200 of the present embodiment is a 3-phase motor, and includes U-phase winding 200U, V-phase winding 200V and W-phase winding 200W. The inverter circuit 1 includes a first U-phase switching element 11U, a first V-phase switching element 11V, a first W-phase switching element 11W, and freewheeling diodes 12U, 12V, and 12W on the high side. The inverter circuit 1 includes a second U-phase switching element 13U, a second V-phase switching element 13V, a second W-phase switching element 13W, and freewheeling diodes 14U, 14V, and 14W on the low side.
One end of the first U-phase switching element 11U is connected to the first terminal 101 via a first power line 111. The other end of the first U-phase switching element 11U is connected to one end of the second U-phase switching element 13U. The other end of second U-phase switching element 13U is connected to second power line 112. Therefore, the other end of the second U-phase switching element 13U is connected to the third terminal 103 via the second power line 112 and the GND line 113. In the present embodiment, the first U-phase switching element 11U and the second U-phase switching element 13U are field effect transistors, the drain terminal of the first U-phase switching element 11U is connected to the first terminal 101 via the first power line 111, and the source terminal of the second U-phase switching element 13U is connected to the third terminal 103 via the second power line 112 and the GND line 113. The source terminal of the first U-phase switching element 11U is connected to the drain terminal of the second U-phase switching element 13U.
Similarly, one end of the first V-phase switching element 11V is connected to the first terminal 101 via the first power line 111. The other end of the first V-phase switching element 11V is connected to one end of the second V-phase switching element 13V. The other end of the second V-phase switching element 13V is connected to the third terminal 103 via a second power line 112 and a GND line 113. In the present embodiment, the first V-phase switching element 11V and the second V-phase switching element 13V are field effect transistors.
Further, one end of the first W-phase switching element 11W is connected to the first terminal 101 via a first power line 111. The other end of the first W-phase switching element 11W is connected to one end of the second W-phase switching element 13W. The other end of the second W-phase switching element 13W is connected to the third terminal 103 via a second power line 112 and a GND line 113. In the present embodiment, the first W-phase switching element 11W and the second W-phase switching element 13W are field effect transistors.
A freewheeling diode 12U is connected in parallel to the first U-phase switching element 11U. The freewheeling diode 12V is connected in parallel to the first V-phase switching element 11V. The freewheeling diode 12W is connected in parallel to the first W-phase switching element 11W. The freewheeling diode 14U is connected in parallel to the second U-phase switching element 13U. The freewheeling diode 14V is connected in parallel to the second V-phase switching element 13V. The freewheeling diode 14W is connected in parallel to the second W-phase switching element 13W.
The control unit 2 inputs control signals UH, VH, WH, UL, VL, and WL to the inverter circuit 1, and controls the operations of the first U-phase switching element 11U, the first V-phase switching element 11V, the first W-phase switching element 11W, the second U-phase switching element 13U, the second V-phase switching element 13V, and the second W-phase switching element 13W. The operation of each switching element of the inverter circuit 1 is controlled by the control unit 2, and the inverter circuit 1 generates a drive voltage.
More specifically, the inverter circuit 1 generates a U-phase drive voltage, a V-phase drive voltage, and a W-phase drive voltage based on the control signals UH, VH, WH, UL, VL, and WL. The U-phase driving voltage is applied to the U-phase winding 200U. The V-phase driving voltage is applied to the V-phase winding 200V. The W-phase drive voltage is applied to the W-phase winding 200W. The U-phase drive voltage is a rectangular wave-shaped voltage having a phase difference of 120 ° from the V-phase drive voltage. The V-phase drive voltage is a rectangular wave-shaped voltage having a phase difference of 120 ° from the W-phase drive voltage. The W-phase drive voltage is a rectangular wave-shaped voltage having a phase difference of 120 ° from the U-phase drive voltage.
The description returns to the motor control device 100 shown in fig. 1. The first signal line 3 has one end 3a and the other end 3 b. The speed command signal Vsp is input to the one end 3a of the first signal line 3. The other end 3b of the first signal line 3 is connected to the control unit 2. The speed command signal Vsp input to the one end 3a of the first signal line 3 is input to the control unit 2 via the first signal line 3. In the present embodiment, the first terminal 3a of the first signal line 3 is connected to the second terminal 102. The other end 3b of the first signal line 3 is connected to a speed command input terminal 21 of the control unit 2. The first signal line 3 is, for example, a wiring pattern formed on a substrate.
The diode 4 has an anode a and a cathode K. The diode 4 is connected to the first signal line 3. The speed command signal Vsp is input to the diode 4 from the anode a. Diode 4 outputs speed command signal Vsp from cathode K to control unit 2.
Specifically, the first signal line 3 has a first portion 31 that is a portion on the anode a side of the diode 4 and a second portion 32 that is a portion on the cathode K side of the diode 4. The first portion 31 of the first signal line 3 includes one end 3a of the first signal line 3, and the speed command signal Vsp is input to the anode a of the diode 4. The second portion 32 of the first signal line 3 includes the other end 3b of the first signal line 3, and the speed command signal Vsp output from the cathode K of the diode 4 is input to the control unit 2. Hereinafter, the first portion 31 of the first signal line 3 may be referred to as "input line 31 of the first signal line 3", and the second portion 32 of the first signal line 3 may be referred to as "output line 32 of the first signal line 3".
The switching element 5 operates in accordance with a voltage difference VD between a first voltage V1, which is a voltage of the input line 31 of the first signal line 3, and a second voltage V2, which is a voltage of the output line 32 of the first signal line 3. The voltage difference VD is generated due to a sharp decrease in the voltage value of the speed command signal Vsp. For example, when the power supply of the actual machine is turned off while the motor 200 is rotating, the voltage value of the speed command signal Vsp is abruptly decreased.
Specifically, the motor control device 100 of the present embodiment further includes a second signal line 114 and a third signal line 115. One end of the second signal line 114 is connected to the input line 31 of the first signal line 3 at a first connection point C1. The other end of the second signal line 114 is connected to the switching element 5. Therefore, the first voltage V1 is applied to the switching element 5 via the second signal line 114. One end of the third signal line 115 is connected to the output line 32 of the first signal line 3 at a second connection point C2. The other end of the third signal line 115 is connected to the switching element 5. Therefore, the second voltage V2 is applied to the switching element 5 via the third signal line 115. The second signal line 114 and the third signal line 115 are, for example, wiring patterns formed on a substrate.
The control unit 2 stops the operation of the inverter circuit 1 in response to the switching element 5 operating.
Specifically, the motor control device 100 of the present embodiment further includes a fourth signal line 116, a fifth signal line 117, and the resistance element 10. The control unit 2 of the present embodiment further includes an off terminal 23. One end of the fourth signal line 116 is connected to the switching element 5. The other end of the fourth signal line 116 is connected to the GND line 113 at a third connection point C3. One end of the fifth signal line 117 is connected to the fourth signal line 116 at a fourth connection point C4. The other end of the fifth signal line 117 is connected to the disconnection terminal 23 of the control unit 2. The resistance element 10 is connected to the fourth signal line 116 between the third connection point C3 and the fourth connection point C4.
In the present embodiment, the switching element 5 is turned on in response to the generation of the voltage difference VD. When the switching element 5 is turned on, a current flows in the resistance element 10. As a result, a voltage is applied to the off terminal 23 of the control unit 2. The control unit 2 stops the operation of the inverter circuit 1 in response to the voltage applied to the disconnection terminal 23.
Here, "to stop the operation of the inverter circuit 1" means to turn off the plurality of switching elements of the inverter circuit 1. More specifically, the control unit 2 turns off the first U-phase switching element 11U, the first V-phase switching element 11V, the first W-phase switching element 11W, the second U-phase switching element 13U, the second V-phase switching element 13V, and the second W-phase switching element 13W, which have been described with reference to fig. 2, in response to the switching element 5 operating.
As described above with reference to fig. 1, according to the present embodiment, when the voltage value of speed command signal Vsp rapidly decreases, control unit 2 stops the operation of inverter circuit 1. Therefore, the application of the voltage of the opposite phase to the direct-current power supply DC can be suppressed.
Specifically, the voltage of the opposite phase indicates a voltage having a polarity opposite to the positive electrode of the DC power supply DC among the induced voltages generated in the motor 200. The induced voltage is input to the inverter circuit 1 during rotation of the motor 200. According to the present embodiment, when the voltage value of the speed command signal Vsp rapidly decreases, the plurality of switching elements of the inverter circuit 1 are turned off. Therefore, even if a voltage of an opposite phase is input to the inverter circuit 1, it is possible to suppress the application of a voltage of an opposite phase from the inverter circuit 1 to the direct-current power supply DC via the first power line 111.
According to the present embodiment, since the application of the voltage of the opposite phase to the DC power supply DC can be suppressed, the generation of the braking force with respect to the rotation of the motor 200 can be suppressed. Therefore, the rotor vibration included in the motor 200 can be suppressed when the voltage value of the speed command signal Vsp is abruptly decreased. As a result, vibration of a rotating member such as a fan attached to the rotor can be suppressed. In addition, the generation of noise due to the vibration of the rotating member can be suppressed.
Next, the switching element 5 of the present embodiment will be further described with reference to fig. 1. The switching element 5 of the present embodiment operates in response to the voltage difference VD becoming equal to or greater than a certain value. Therefore, the switching element 5 can be prevented from operating when the actual machine side controller 300 decelerates the rotation speed of the motor 200.
Specifically, as described above, the real-machine-side controller 300 decreases the voltage value of the speed command signal Vsp when the rotation speed of the motor 200 is to be reduced. Therefore, the voltage difference VD may be generated even at the time of normal deceleration. However, during normal deceleration, the real-machine-side control device 300 gradually decreases the voltage value of the speed command signal Vsp. Therefore, the voltage difference VD generated at the time of normal deceleration is smaller than the voltage difference VD generated at the time when the voltage value of the speed command signal Vsp is rapidly decreased. According to the present embodiment, the switching element 5 operates in response to the voltage difference VD becoming equal to or greater than a certain value, and therefore does not operate during normal deceleration. Therefore, the operation of the inverter circuit 1 can be prevented from being stopped during normal deceleration. The fixed value may be any value as long as it is larger than the voltage difference VD generated during normal deceleration.
The switching element 5 of the present embodiment is a transistor. More specifically, the switching element 5 is a pnp-type bipolar transistor. Therefore, the switching element 5 has an emitter terminal E, a base terminal B, and a collector terminal C. The emitter terminal E of the switching element 5 is connected to the third signal line 115. The base terminal B of the switching element 5 is connected to the second signal line 114. The collector terminal C of the switching element 5 is connected to the fourth signal line 116. Therefore, the first voltage V1 is applied to the base terminal B of the switching element 5. The second voltage V2 is applied to the emitter terminal E of the switching element 5. The switching element 5 is turned on in response to a voltage applied to the base terminal B being lower than a voltage applied to the emitter terminal E by a certain value or more. Therefore, the switching element 5 is turned on in response to the voltage difference VD becoming equal to or greater than a certain value.
By using a transistor as the switching element 5, the configuration in which the switching element 5 operates in response to the voltage difference VD becoming equal to or greater than a certain value can be made simpler. In addition, by using a transistor as the switching element 5, power consumption of the motor control device 100 can be reduced.
Embodiment 1 of the present invention is explained above with reference to fig. 1 and 2. In the present embodiment, the switching element 5 is a pnp-type bipolar transistor, but various transistors can be suitably used for the switching element 5. For example, the switching element 5 may be an npn-type bipolar transistor. Alternatively, the switching element 5 may be a field effect transistor.
In the present embodiment, the motor 200 is a 3-phase motor, but the motor 200 is not limited to a 3-phase motor. For example, the motor 200 may be a single-phase motor, a 2-phase motor, a 5-phase motor, or a 7-phase motor.
In the present embodiment, the inverter circuit 1 has 6 switching elements, but the number of switching elements in the inverter circuit 1 differs depending on the type of the motor 200.
In the present embodiment, the switching element of the inverter circuit 1 is a field-effect transistor, but the switching element of the inverter circuit 1 is not limited to a field-effect transistor. For example, the switching elements of the inverter circuit 1 may be bipolar transistors.
[ embodiment 2]
Next, embodiment 2 of the present invention will be described with reference to fig. 3. However, descriptions will be given of different matters from embodiment 1, and descriptions of the same matters as embodiment 1 will be omitted. The motor control device 100 according to embodiment 2 is different from the motor control device 100 according to embodiment 1 in that it further includes a capacitor circuit 6. The capacitor circuit 6 is an example of a first capacitor circuit.
Fig. 3 is a diagram showing the configuration of the motor control device 100 of the present embodiment. As shown in fig. 3, the motor control device 100 further has a capacitor circuit 6. The capacitor circuit 6 is connected to the output line 32 of the first signal line 3, and maintains the second voltage V2 for a predetermined time. Here, the length of the fixed time corresponds to the capacitance of the capacitor circuit 6.
Specifically, the capacitor circuit 6 includes a capacitor element 61. One end of the capacitor element 61 is connected to the first signal line 3 at a position closer to the other end 3b of the first signal line 3 than the second connection point C2. The other end of capacitor element 61 is connected to ground. Specifically, the other end of the capacitor element 61 is electrically connected to the GND line 113.
The capacitor circuit 6 is charged with the speed command signal Vsp when the motor 200 is driven. When the voltage value of the speed command signal Vsp sharply decreases, the capacitor circuit 6 starts discharging. As a result, even if the voltage value of the speed command signal Vsp is rapidly decreased, the second voltage V2 is not rapidly decreased and is maintained for a certain time.
In the present embodiment, the switching element 5 operates in response to the first voltage V1 being lower than the second voltage V2. Specifically, when the voltage value of the speed command signal Vsp sharply decreases, the first voltage V1 sharply decreases. On the other hand, the voltage value of the second voltage V2 is maintained for a certain time by the capacitor circuit 6. Since the diode 4 is interposed between the output line 32 and the input line 31, the current discharged from the capacitor circuit 6 does not flow to the input line 31 side. Therefore, the first voltage V1 is lower than the second voltage V2, generating the voltage difference VD. As a result, the switching element 5 operates.
In the present embodiment, the capacitor circuit 6 has one capacitor element 61, but the capacitor circuit 6 may have a plurality of capacitor elements 61. The plurality of capacitor elements 61 are connected in parallel, for example.
[ embodiment 3]
Next, embodiment 3 of the present invention will be described with reference to fig. 4. However, the description will be given of the differences from embodiments 1 and 2, and the description of the same matters as in embodiments 1 and 2 will be omitted. The motor control device 100 according to embodiment 3 is different from the motor control devices 100 according to embodiments 1 and 2 in that it further includes a filter circuit 7. In the following description, the capacitor circuit 6 is referred to as a "first capacitor circuit 6".
Fig. 4 is a diagram showing the configuration of the motor control device 100 of the present embodiment. As shown in fig. 4, the motor control device 100 further includes a filter circuit 7. The filter circuit 7 is connected to the input line 31 of the first signal line 3, and smoothes noise of the speed command signal Vsp. Therefore, according to the present embodiment, the speed command signal Vsp with the noise smoothed can be input to the control unit 2. As a result, the rotation speed of the motor 200 can be set to a rotation speed corresponding to the speed command from the actual machine more stably.
The filter circuit 7 is connected to the first signal line 3 at a position closer to the one end 3a of the first signal line 3 than the first connection point C1. Therefore, the voltage output from the filter circuit 7 is input to the switching element 5. In other words, in the present embodiment, the first voltage V1 represents the voltage output from the filter circuit 7.
The filter circuit 7 has a resistance circuit 71 and a capacitor circuit 72. The capacitor circuit 72 is an example of a second capacitor circuit. In the following description, the capacitor circuit 72 is referred to as a "second capacitor circuit 72". The capacitance of the second capacitor circuit 72 is smaller than the capacitance of the first capacitor circuit 6. In other words, the electrostatic capacity of the first capacitor circuit 6 is larger than that of the second capacitor circuit 72.
The resistance circuit 71 has a resistance element 711. The resistance element 711 is connected to the first signal line 3 between the one end 3a of the first signal line 3 and the first connection point C1. The second capacitor circuit 72 has a capacitor element 721. One end of the capacitor element 721 is connected to the first signal line 3 between the resistance element 711 and the first connection point C1. The other end of the capacitor element 721 is connected to the ground. Specifically, the other end of the capacitor element 721 is electrically connected to the GND line 113.
Embodiment 3 of the present invention is explained above with reference to fig. 4. According to the present embodiment, noise of the speed command signal Vsp can be smoothed by a simple circuit using the resistance element 711 and the capacitor element 721. Further, since the capacitance of the first capacitor circuit 6 is larger than the capacitance of the second capacitor circuit 72, the first voltage V1 can be stably made smaller than the second voltage V2 when the voltage value of the speed command signal Vsp is rapidly decreased. As a result, the voltage difference VD can be generated more stably when the voltage value of the speed command signal Vsp is rapidly decreased.
[ embodiment 4]
Next, embodiment 4 of the present invention will be described with reference to fig. 5. However, the description will be given of the differences from the embodiments 1 to 3, and the description of the same matters as the embodiments 1 to 3 will be omitted. The motor control device 100 according to embodiment 4 is different from the motor control devices 100 according to embodiments 1 to 3 in that it further includes a power supply 8 for an off terminal and a switching element 9. In the following description, the switching element 5 is referred to as a "first switching element 5".
Fig. 5 is a diagram showing the configuration of the motor control device 100 of the present embodiment. As shown in fig. 5, the motor control device 100 further includes a power supply 8 for the off terminal and a switching element 9. The switching element 9 is an example of a second switching element. In the following description, the switching element 9 is referred to as a "second switching element 9".
The disconnection-terminal power supply 8 is electrically connected to the control unit 2. In the present embodiment, the off-terminal power supply 8 is electrically connected to the off-terminal 23 of the control unit 2. More specifically, the motor control device 100 of the present embodiment includes the resistance element 81. The open-terminal power supply 8 is connected to the fifth signal line 117 via the resistive element 81. The power supply 8 for the open terminal is a power supply such as a regulator, for example.
The second switching element 9 changes the voltage value of the voltage applied from the off-terminal power supply 8 to the off-terminal 23 of the control unit 2 in accordance with the operation of the first switching element 5. The control unit 2 stops the operation of the inverter circuit 1 in response to a change in the voltage value of the voltage applied to the off terminal 23.
Specifically, one end of the fifth signal line 117 of the present embodiment is connected to one end of the second switching element 9. Therefore, one end of the second switching element 9 is connected to the off-terminal power supply 8 via the resistance element 81. The other end of the second switching element 9 is connected to the ground. Specifically, the second switching element 9 of the present embodiment has the other end connected to the GND line 113.
When the second switching element 9 is in the off state, a certain constant voltage is applied from the off-terminal power supply 8 to the off-terminal 23 of the control unit 2 via the resistance element 81. The second switching element 9 is turned on in response to the first switching element 5 operating. When the second switching element 9 is in the on state, the resistance element 81 is connected to the GND line 113 via the second switching element 9, and a potential difference is generated between the resistance element 81 and the GND line 113. As a result, a current flows from the off-terminal power supply 8 to the GND line 113, and the voltage value of the voltage applied from the off-terminal power supply 8 to the off-terminal 23 of the control unit 2 changes. More specifically, the voltage value of the voltage applied to the off terminal 23 becomes 0V. The control unit 2 stops the operation of the inverter circuit 1 in response to the voltage value of the voltage applied to the off terminal 23 becoming 0V.
In this embodiment, the second switching element 9 is a bipolar transistor. Therefore, the second switching element 9 has a collector terminal C, a base terminal B, and an emitter terminal E. The motor control device 100 of the present embodiment includes a resistance element 91.
The collector terminal C of the second switching element 9 is connected to one end of the fifth signal line 117. Therefore, the collector terminal C of the second switching element 9 is electrically connected to the off-terminal power supply 8 via the resistance element 81. The emitter terminal E of the second switching element 9 is electrically connected to the GND line 113. The base terminal B of the second switching element 9 is connected to the fourth signal line 116 via the resistance element 91.
The resistance element 91 converts the voltage of the fourth signal line 116 into a current and inputs the current to the base terminal B of the second switching element 9. Therefore, when the first switching element 5 is turned on, a current is input to the base terminal B of the second switching element 9, and the second switching element 9 is turned on. Specifically, when the first switching element 5 is turned on, a current flows through the resistance element 10, and a voltage is applied to the resistance element 91. As a result, a current is input to the base terminal B of the second switching element 9, and the second switching element 9 is turned on.
Specifically, the voltage range of the speed command signal Vsp is different from the voltage range in which the off terminal 23 functions. Therefore, when the speed command signal Vsp is directly input to the disconnection terminal 23, there is a possibility that the disconnection terminal 23 cannot function. Therefore, when the speed command signal Vsp is input to the disconnection terminal 23 to cause the disconnection terminal 23 to function, an amplification circuit for amplifying the voltage applied to the disconnection terminal 23 may be additionally required. In contrast, according to the present embodiment, the operation of the inverter circuit 1 can be stopped by causing the disconnection terminal 23 to function without providing an amplification circuit.
In the present embodiment, the second switching element 9 is a bipolar transistor, but the second switching element 9 is not limited to a bipolar transistor. For example, the second switching element 9 may be a field effect transistor.
In the present embodiment, the following configuration is explained: the second switching element 9 is turned on in response to the first switching element 5 operating, and as a result, the voltage applied to the off terminal 23 of the control unit 2 changes, but may be configured as follows: the second switching element 9 is turned off in response to the operation of the first switching element 5, and as a result, the voltage applied to the off terminal 23 of the control unit 2 changes.
The embodiments of the present invention have been described above with reference to the drawings. However, the present invention is not limited to the above-described embodiments, and can be implemented in various embodiments without departing from the scope of the present invention. The plurality of components disclosed in the above embodiments can be changed as appropriate. For example, any one of all the components described in one embodiment may be added to the components of another embodiment, or some of all the components described in one embodiment may be deleted from the embodiments.
For example, although the motor control device 100 includes the first to third terminals 101 to 103 in the embodiment of the present invention, a part or all of the first to third terminals 101 to 103 may be omitted.
In the embodiment of the present invention, the switching element 5 is turned on when the first voltage V1 is lower than the second voltage V2, but the switching element 5 may be turned on when the second voltage V2 is lower than the first voltage V1.
In the embodiment of the present invention, the switching element 5 is turned on in response to the generation of the voltage difference VD, but the switching element 5 may be turned off in response to the generation of the voltage difference VD.
[ industrial applicability ]
The present invention is useful for a device for controlling a motor.
Claims (6)
1. A motor control device for controlling a motor, wherein,
the motor control device includes:
an inverter circuit that generates a drive voltage for driving the motor;
a control unit that controls the inverter circuit in accordance with a speed command signal indicating a rotational speed of the motor;
a signal line having one end to which the speed command signal is input and the other end connected to the control unit;
a diode having an anode and a cathode, connected to the signal line, receiving the speed command signal from the anode, and outputting the speed command signal from the cathode to the control unit; and
a first switching element that operates in accordance with a voltage difference between a first voltage that is a voltage of the anode-side portion of the signal line and a second voltage that is a voltage of the cathode-side portion of the signal line,
the control unit stops the operation of the inverter circuit in response to the first switching element operating.
2. The motor control apparatus according to claim 1,
The motor control device further includes a first capacitor circuit connected to the cathode-side portion of the signal line to maintain the second voltage for a certain time,
the first switching element operates in response to the first voltage being lower than the second voltage.
3. The motor control apparatus according to claim 2,
the motor control device further includes a filter circuit having a resistance circuit and a second capacitor circuit, smoothing noise of the speed command signal,
the filter circuit is connected to the portion on the anode side in the signal line,
the first voltage represents a voltage output from the filter circuit,
the first capacitor circuit has a capacitance larger than that of the second capacitor circuit.
4. The motor control device according to any one of claims 1 to 3,
the first switching element operates in response to the voltage difference becoming equal to or greater than a predetermined value.
5. The motor control apparatus according to claim 4,
the first switching element is a transistor.
6. The motor control device according to any one of claims 1 to 5,
the motor control device further includes:
a power supply electrically connected to the control unit; and
a second switching element that changes a voltage value of a voltage applied from the power supply to the control unit according to an operation of the first switching element,
the control unit stops the operation of the inverter circuit in response to a change in the voltage value.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019-084376 | 2019-04-25 | ||
| JP2019084376A JP7234028B2 (en) | 2019-04-25 | 2019-04-25 | motor controller |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111865170A true CN111865170A (en) | 2020-10-30 |
Family
ID=72985092
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010310176.2A Withdrawn CN111865170A (en) | 2019-04-25 | 2020-04-20 | Motor control device |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP7234028B2 (en) |
| CN (1) | CN111865170A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4587468A (en) * | 1984-01-25 | 1986-05-06 | Kabushiki Kaisha Morita Seisakusho | Sudden stop circuit for a brushless micromotor |
| JPH11356074A (en) * | 1998-06-08 | 1999-12-24 | Okuma Corp | Controller of induction motor |
| JP2014100035A (en) * | 2012-11-16 | 2014-05-29 | Cosel Co Ltd | Flyback type switching power supply |
| JP2015046989A (en) * | 2013-08-28 | 2015-03-12 | 日本電産テクノモータ株式会社 | Motor driving apparatus |
| CN105471357A (en) * | 2014-09-30 | 2016-04-06 | 日本电产高科电机株式会社 | Motor drive device |
| CN108075696A (en) * | 2016-11-15 | 2018-05-25 | 德昌电机(深圳)有限公司 | Motor and motor-drive circuit |
| CN208522670U (en) * | 2018-08-17 | 2019-02-19 | 西安科技大学 | A kind of brshless DC motor fan Sofe Switch driving circuit |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS497905U (en) * | 1972-04-21 | 1974-01-23 | ||
| JP2508845Y2 (en) * | 1990-03-14 | 1996-08-28 | 愛知電機株式会社 | DC motor deceleration braking device |
-
2019
- 2019-04-25 JP JP2019084376A patent/JP7234028B2/en active Active
-
2020
- 2020-04-20 CN CN202010310176.2A patent/CN111865170A/en not_active Withdrawn
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4587468A (en) * | 1984-01-25 | 1986-05-06 | Kabushiki Kaisha Morita Seisakusho | Sudden stop circuit for a brushless micromotor |
| JPH11356074A (en) * | 1998-06-08 | 1999-12-24 | Okuma Corp | Controller of induction motor |
| JP2014100035A (en) * | 2012-11-16 | 2014-05-29 | Cosel Co Ltd | Flyback type switching power supply |
| JP2015046989A (en) * | 2013-08-28 | 2015-03-12 | 日本電産テクノモータ株式会社 | Motor driving apparatus |
| CN105471357A (en) * | 2014-09-30 | 2016-04-06 | 日本电产高科电机株式会社 | Motor drive device |
| CN108075696A (en) * | 2016-11-15 | 2018-05-25 | 德昌电机(深圳)有限公司 | Motor and motor-drive circuit |
| CN208522670U (en) * | 2018-08-17 | 2019-02-19 | 西安科技大学 | A kind of brshless DC motor fan Sofe Switch driving circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2020182331A (en) | 2020-11-05 |
| JP7234028B2 (en) | 2023-03-07 |
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