WO2014091602A1 - モータ制御装置 - Google Patents
モータ制御装置 Download PDFInfo
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- WO2014091602A1 WO2014091602A1 PCT/JP2012/082363 JP2012082363W WO2014091602A1 WO 2014091602 A1 WO2014091602 A1 WO 2014091602A1 JP 2012082363 W JP2012082363 W JP 2012082363W WO 2014091602 A1 WO2014091602 A1 WO 2014091602A1
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- motor
- dynamic brake
- speed
- brake
- switching
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- 238000006243 chemical reaction Methods 0.000 description 7
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- 239000003990 capacitor Substances 0.000 description 2
- 238000009499 grossing Methods 0.000 description 2
- 230000018199 S phase Effects 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
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Classifications
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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
- H02P3/22—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 by short-circuit or resistive braking
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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
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/08—Arrangements for controlling the speed or torque of a single motor
- H02P6/085—Arrangements for controlling the speed or torque of a single motor in a bridge configuration
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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
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/24—Arrangements for stopping
Definitions
- the present invention relates to a motor control device.
- Patent Document 1 in a motor control device, when a break relay is turned on at the time of braking of a motor to short-circuit between motor windings and an overcurrent of the motor is transmitted to the break resistor, an excessive amount consumed by the break resistor is disclosed. It is described that the duty ratio of the switching operation of the switching element on the upper side of the inverter unit is controlled so that the amount of current changes in proportion to the rotational speed of the motor. Thus, according to Patent Document 1, since the amount of overcurrent consumed by the break resistance increases when the rotation speed of the motor is high, even when the capacity of the break resistance is reduced, the motor or break relay due to the overcurrent is reduced. It is said that it can prevent damage.
- Patent Document 2 describes that in an inverter control device, when an emergency stop of a servo motor is performed, a current flowing through a dynamic brake resistor is controlled to be constant. Thus, according to Patent Document 2, since the rotation speed of the servo motor linearly decreases, the coasting distance of the servo motor from the output of the emergency stop command to the stop can be shortened.
- Patent Documents 1 and 2 are based on the premise that a dynamic brake resistor is always used to stop the motor. For this reason, there is a limit to shortening the motor stop time and the motor stop distance at the time of emergency stop.
- the present invention has been made in view of the above, and an object of the present invention is to obtain a motor control device that can significantly reduce the motor stop time and the motor stop distance at the time of emergency stop.
- a motor control device includes a plurality of P-side switching elements and a plurality of N-side switching elements, and a plurality of motor terminals.
- An inverter circuit that drives the motor, a first dynamic brake that brakes the motor by turning on all phases of the plurality of P-side switching elements or all phases of the plurality of N-side switching elements, and a motor terminal
- a second dynamic brake for braking the motor by connecting a dynamic brake resistor between the first dynamic brake and the second dynamic brake, and a dynamic brake to be braked on the motor according to the motor speed.
- a control unit that switches between the brakes.
- the control unit switches the dynamic brake to be braked to the motor between the first dynamic brake and the second dynamic brake in accordance with the motor speed.
- a dynamic brake system suitable for reducing the motor stop time and the motor stop distance can be selected according to the motor speed, so that the motor stop time and the motor stop distance at the time of emergency stop can be greatly reduced.
- FIG. 1 is a diagram illustrating a configuration of the motor control device according to the first embodiment.
- FIG. 2 is a diagram showing the relationship between motor speed and torque current in the two dynamic brake systems in the first embodiment.
- FIG. 3 is a flowchart illustrating the operation of the motor control device according to the first embodiment.
- FIG. 4 is a diagram showing the effect of the first embodiment.
- FIG. 5 is a flowchart illustrating the operation of the motor control device according to the modification of the first embodiment.
- FIG. 6 is a diagram illustrating a configuration of the motor control device according to the second embodiment.
- FIG. 7 is a flowchart illustrating the operation of the motor control device according to the second embodiment.
- FIG. 1 is a diagram illustrating a configuration of the motor control device 100.
- the motor control device 100 receives power (for example, three-phase AC power) from a power source (for example, AC power source) PS, performs a power conversion operation on the received power, and generates generated driving power (for example, 3).
- the motor M is driven using phase AC power), and various machines including the motor M are driven.
- the motor control device 100 includes a converter circuit 3, an inverter circuit 1, and a power conversion control unit 13.
- the converter circuit 3 receives AC power (for example, three phases of R phase, S phase, and T phase) from the power source PS, converts the received AC power into DC power, and outputs the DC power to the inverter circuit 1.
- the converter circuit 3 includes, for example, a plurality of diodes D1 to D6 and a smoothing capacitor C.
- the AC power is rectified by the plurality of diodes D1 to D6, and the rectified DC power is smoothed by the smoothing capacitor C.
- the smoothed DC power is output to the inverter circuit 1.
- the inverter circuit 1 receives DC power from the converter circuit 3 and converts the received DC power into AC power (for example, U-phase, V-phase, and W-phase).
- the inverter circuit 1 includes, for example, a plurality of P-side switching elements UP, VP, WP and a plurality of N-side switching elements UN, VN, WN.
- the plurality of P-side switching elements UP, VP, and WP respectively correspond to the U phase, V phase, and W phase of three-phase AC power to be converted.
- the plurality of N-side switching elements UN, VN, and WN respectively correspond to the U phase, V phase, and W phase of three-phase AC power to be converted.
- the power conversion control unit 13 controls the power conversion operation by the inverter circuit 1. That is, the power conversion control unit 13 causes the inverter circuit to perform a switching operation at a predetermined timing for each of the plurality of P-side switching elements UP, VP, WP and each of the plurality of N-side switching elements UN, VN, WN. 1 controls to convert DC power into AC power.
- the inverter circuit 1 drives the motor M by outputting the converted AC power to the motor M via the power lines UL, VL, WL of each phase.
- the power lines UL, VL, WL of each phase connect the output nodes UO, VO, WO of each phase in the inverter circuit 1 and the motor terminals U, V, W of each phase in the motor M. That is, the inverter circuit 1 drives the motor M via the plurality of motor terminals U, V, and W.
- a dynamic brake method using a switching element that stops by short-circuiting between motor terminals by a switching element, and a stop by connecting a resistor between the motor terminals and short-circuiting are performed.
- a dynamic brake system with brake resistance a dynamic brake system with brake resistance.
- the motor control device 100 further includes a first dynamic brake 11, a brake resistance circuit 2, and a second dynamic brake 12.
- the first dynamic brake 11 brakes the motor M by controlling the inverter circuit 1 and turning on all phases of the plurality of P-side switching elements or all phases of the plurality of N-side switching elements.
- the first dynamic brake 11 is in a state in which all the plurality of N-side switching elements UN, VN, WN are turned off, and in which all the plurality of P-side switching elements UP, VP, WP are turned on.
- the first dynamic brake 11 is in a state where all of the plurality of P-side switching elements UP, VP, and WP are turned off, and the plurality of N-side switching elements UN, VN, and WN are all turned on. Maintain the state. Thereby, the motor terminals U, V, and W can be short-circuited and the motor M can be braked.
- the brake resistance circuit 2 is configured to be switchable between a state in which a dynamic brake resistor is connected between a plurality of motor terminals U, V, and W and a state in which no dynamic brake resistor is connected.
- the brake resistance circuit 2 is configured to be able to switch between a state in which a dynamic brake resistor is connected between a plurality of power lines UL, VL, and WL and a state in which no dynamic brake resistor is connected.
- the brake resistance circuit 2 has a plurality of switches SW1, SW2 and a plurality of dynamic brake resistors R21, R22, R23.
- the switch SW1 has one end connected to the power line UL and the other end connected to the dynamic brake resistor R21.
- the switch SW2 has one end connected to the power line VL and the other end connected to the dynamic brake resistor R22.
- the dynamic brake resistor R21 has one end connected to the switch SW1 and the other end connected to the dynamic brake resistors R22 and R23.
- the dynamic brake resistor R22 has one end connected to the switch SW2 and the other end connected to the dynamic brake resistors R21 and R23.
- the dynamic brake resistor R23 has one end connected to the power line WL and the other end connected to the dynamic brake resistors R21 and R22.
- the second dynamic brake 12 controls the brake resistance circuit 2 to connect the dynamic brake resistors R21 to R23 between the plurality of motor terminals U, V, and W to brake the motor M.
- the second dynamic brake 12 turns on the plurality of switches SW1 and SW2 to connect the dynamic brake resistors R21 to R23 between the plurality of motor terminals U, V, and W.
- the motor M can be braked by short-circuiting the motor terminals U, V, and W via the dynamic brake resistors R21 to R23.
- the motor M is always braked by the second dynamic brake 12 during an emergency stop.
- the dynamic brake resistance R21 to R23 is stopped by the dynamic brake resistors R21 to R23 so that the motor is damaged or the magnet is demagnetized if an excessive current flows during the sudden braking of the motor, so that the current flowing to the motor does not become excessive. Select the resistance value.
- E is the induced voltage constant [V / (r / min)]
- N is the servo motor speed [r / min]
- R1 is the armature resistance [ ⁇ ].
- R2 is a dynamic brake resistance [ ⁇ ]
- L armature inductance [H]
- P is the number of motor poles.
- the motor controller 100 does not include the second dynamic brake 12.
- the motor M is always braked by the first dynamic brake 11 during an emergency stop.
- the dynamic brake stop by the switching element may cause an excessive current to flow when the motor speed is high. There is a possibility that the torque becomes small and the motor stop time and the motor stop distance from the start of deceleration to the stop become long.
- E is the induced voltage constant [V / (r / min)]
- N is the servo motor speed [r / min]
- R1 is the armature resistance [ ⁇ ].
- L armature inductance [H]
- P is the number of motor poles.
- the motor stop time and the motor stop distance at the time of emergency stop can be significantly shortened. aim.
- the motor control apparatus 100 further includes an emergency stop command generation unit 14, a motor speed calculation unit 5, a switching speed value storage unit 7, and a brake switching control unit 6.
- the emergency stop command generator 14 generates an emergency stop command when an abnormality occurs in the motor M or the motor control device 100 while the inverter circuit 1 is driving the motor M.
- the emergency stop command generator 14 may generate an emergency stop command in response to pressing of the emergency stop button.
- the emergency stop command generation unit 14 may monitor the operation state of the motor M or the motor control device 100 and generate an emergency stop command in response to detecting an abnormality in the motor M or the motor control device 100. Good.
- the emergency stop command generation unit 14 supplies the generated emergency stop command to the brake switching control unit 6.
- the motor speed calculation unit 5 receives information on the motor position from a position detector ENC that detects the position of the motor M, for example.
- the motor speed calculation unit 5 calculates the motor speed from the motor position and supplies it to the brake switching control unit 6.
- the switching speed value storage unit 7 stores the dynamic brake switching speed.
- the dynamic brake switching speed is a value serving as a reference when switching between the dynamic brake by the dynamic brake resistor and the dynamic brake by the switching element.
- the condition of the motor speed N at which the braking torque is increased by performing dynamic braking by the dynamic brake resistance is the following (formula 3).
- the value on the right side of (Equation 3) is the dynamic brake switching speed.
- the value on the right side of (Expression 3) is shown as the dynamic brake switching speed Vc in FIGS. 2 and 4, for example.
- the dynamic brake switching speed Vc can be regarded as a boundary point where the characteristics of the dynamic brake due to the dynamic brake resistance and the characteristics of the dynamic brake due to the switching element are reversed.
- the dynamic brake switching speed Vc can be regarded as a boundary point where the magnitude relationship of the torque current with respect to the same motor speed is reversed.
- the switching speed value storage unit 7 stores a value on the right side of (Equation 3) calculated in advance from a motor constant or the like as a dynamic brake switching speed.
- the brake switching control unit 6 When receiving an emergency stop command from the emergency stop command generation unit 14, the brake switching control unit 6 acquires the motor speed from the motor speed calculation unit 5 and also acquires the dynamic brake switching speed from the switching speed value storage unit 7. The brake switching control unit 6 switches the dynamic brake to be braked to the motor M between the first dynamic brake 11 and the second dynamic brake 12 according to the motor speed.
- the brake switching control unit 6 compares the motor speed acquired from the motor speed calculation unit 5 with the dynamic brake switching speed acquired from the switching speed value storage unit 7, and applies a brake to the motor M according to the comparison result.
- the dynamic brake to be applied is switched between the first dynamic brake 11 and the second dynamic brake 12. For example, when the motor speed is higher than the dynamic brake switching speed, the brake switching control unit 6 applies the second dynamic brake 12 to the motor M, and when the motor speed is lower than the dynamic brake switching speed, the first dynamic brake 11 is switched so as to brake the motor M.
- the brake switching control unit 6 selects the second dynamic brake 12 when the motor speed is higher than the dynamic brake switching speed. That is, the brake switching control unit 6 deactivates the first dynamic brake 11 and activates the second dynamic brake 12. As a result, the second dynamic brake 12 controls the brake resistance circuit 2 to connect the dynamic brake resistors R21 to R23 between the plurality of motor terminals U, V, and W to brake the motor M.
- the brake switching control unit 6 selects the first dynamic brake 11 when the motor speed is lower than the dynamic brake switching speed. That is, the brake switching control unit 6 activates the first dynamic brake 11 and deactivates the second dynamic brake 12.
- the first dynamic brake 11 controls the inverter circuit 1 to turn on all phases of the plurality of P-side switching elements or all phases of the plurality of N-side switching elements, thereby braking the motor M. .
- brake switching control unit 6 may perform such comparison and switching operations continuously from the start of the emergency stop or periodically.
- FIG. 3 is a flowchart showing the operation of the motor control device 100.
- step S1 the brake switching control unit 6 determines whether or not an emergency stop should be started. For example, when receiving an emergency stop command from the emergency stop command generating unit 14, the brake switching control unit 6 determines that an emergency stop should be started ("Yes” in step S1), and proceeds to step S2. If an emergency stop command has not been received from the emergency stop command generator 14, it is determined that an emergency stop should not be started ("No" in step S1), and the process proceeds to step S1.
- step S2 the brake switching control unit 6 stops the control operation of the power conversion control unit 13, and acquires the motor speed and the dynamic brake switching speed.
- the brake switching control unit 6 acquires the motor speed from the motor speed calculation unit 5 and acquires the dynamic brake switching speed from the switching speed value storage unit 7.
- step S3 the brake switching control unit 6 compares the motor speed with the dynamic brake switching speed.
- step S4 the brake switching control unit 6 determines whether or not the motor speed is higher than the dynamic brake switching speed.
- the brake switching control unit 6 determines that the motor speed is higher than the dynamic brake switching speed (“Yes” in step S4), the process proceeds to step S5.
- the motor speed is equal to or lower than the dynamic brake switching speed (“No” in step S4) ]
- the process proceeds to step S6.
- step S5 the brake switching control unit 6 selects the second dynamic brake 12. That is, the brake switching control unit 6 deactivates the first dynamic brake 11 and activates the second dynamic brake 12. As a result, the second dynamic brake 12 controls the brake resistance circuit 2 to connect the dynamic brake resistors R21 to R23 between the plurality of motor terminals U, V, and W to brake the motor M.
- step S6 the brake switching control unit 6 selects the first dynamic brake 11. That is, the brake switching control unit 6 activates the first dynamic brake 11 and deactivates the second dynamic brake 12. As a result, the first dynamic brake 11 controls the inverter circuit 1 to turn on all phases of the plurality of P-side switching elements or all phases of the plurality of N-side switching elements, thereby braking the motor M. .
- step S7 the brake switching control unit 6 determines whether or not the motor M has stopped. For example, the brake switching control unit 6 acquires the motor speed from the motor speed calculation unit 5 and determines whether or not the motor speed is zero. If the motor M has stopped ("Yes" in step S7), the brake switching control unit 6 ends the process. If the motor M has not stopped ("No" in step S7), the process returns to step S2. .
- step S2 by repeating the loop from step S2 to step S7 a plurality of times, the comparison and switching operations can be performed continuously or periodically.
- the brake switching control unit 6 changes the dynamic brake to be applied to the motor M according to the motor speed to the first dynamic brake 11 and the second dynamic brake 11. Switch between dynamic brakes 12.
- a dynamic brake system suitable for reducing the motor stop time and the motor stop distance can be selected according to the motor speed, so that the motor stop time and the motor stop distance at the time of emergency stop can be greatly reduced.
- the brake switching control unit 6 uses the motor speed detected using the position detector ENC and the dynamic brake switching speed stored in the switching speed value storage unit 7. Are compared continuously or periodically from the start of the emergency stop, and the dynamic brake to be applied to the motor M is switched between the first dynamic brake 11 and the second dynamic brake 12 in accordance with the comparison result.
- a dynamic brake system suitable for reducing the motor stop time and the motor stop distance can be selected for each stage from the start of the emergency stop, so that the motor M can be braked efficiently.
- the second dynamic brake 12 brakes the motor M so that the motor speed is dynamic.
- the first dynamic brake 11 is switched so as to brake the motor M.
- the deceleration time and the deceleration distance can be shortened similarly to the case indicated by the one-dot chain line, and the motor speed is higher than the dynamic brake switching speed Vc.
- the deceleration time and the deceleration distance can be shortened as in the case indicated by the two-dot chain line.
- a dynamic brake system suitable for shortening the motor stop time and the motor stop distance before and after the dynamic brake switching speed, which is a boundary point where the characteristics of the dynamic brake by the dynamic brake resistance and the characteristics of the dynamic brake by the switching element are reversed. Therefore, the motor stop time and the motor stop distance at the time of emergency stop can be greatly shortened (for example, minimized).
- the characteristics of the dynamic brake according to the first embodiment are the characteristics of the dynamic brake due to the dynamic brake resistance (the one-dot chain line in FIG. 4) and the characteristics of the dynamic brake due to the switching element (in FIG.
- the motor stop time and the motor stop distance can be made shorter than any of the two-dot chain lines.
- the motor speed calculation unit 5 may be omitted in the configuration shown in FIG. In this case, the brake switching control unit 6 acquires the motor speed detected from the speed detector.
- step S4 shown in FIG. 3 the brake switching control unit 6 may determine whether or not the motor speed is equal to or higher than the dynamic brake switching speed. In this case, the brake switching control unit 6 proceeds to step S5 when the motor speed is equal to or higher than the dynamic brake switching speed (“Yes” at step S4), and when the motor speed is lower than the dynamic brake switching speed (step S4). If “No” in S4), the process proceeds to Step S6.
- step S4 shown in FIG. 3 the brake switching control unit 6 performs the first state in which the motor speed exceeds the dynamic brake switching speed, the second state in which the motor speed is equal to the dynamic brake switching speed, and the motor speed is It may be determined which of the third states is lower than the dynamic brake switching speed.
- the brake switching control unit 6 advances the process to step S5.
- the brake switching control unit 6 advances the process to step S7.
- the process may be advanced to step S6. In this case, since the case where the motor speed is in the second state can be set as a dead zone in the control, the control operation can be stabilized.
- the brake switching control unit 6 may perform the comparison and switching operations once immediately after the start of the emergency stop, instead of continuously or periodically from the start of the emergency stop. .
- step S17 shown in FIG. 5 the brake switching control unit 6 determines whether or not the motor M has stopped.
- the brake switching control unit 6 acquires the motor speed from the motor speed calculation unit 5 and determines whether or not the motor speed is zero. If the motor M has stopped ("Yes" in step S17), the brake switching control unit 6 ends the process. If the motor M has not stopped ("No" in step S17), the process returns to step S17. .
- the brake switching control unit 6 uses the motor speed detected using the position detector or the speed detector, and the dynamic brake switching speed stored in the switching speed value storage unit 7. Are compared immediately after the emergency stop is started, and one of the first dynamic brake 11 and the second dynamic brake 12 is selected as a dynamic brake to be applied to the motor M according to the comparison result.
- This makes it possible to select a dynamic brake system that is suitable for reducing the motor stop time and motor stop distance according to the speed at the time of emergency stop start, so emergency stop compared to when the dynamic brake system is fixed The motor stop time and motor stop distance can be greatly reduced.
- the brake switching control unit 6 selects the second dynamic brake 12 when the motor speed is higher than the dynamic brake switching speed, and the first when the motor speed is lower than the dynamic brake switching speed.
- the dynamic brake 11 is selected. This makes it possible to reduce the motor stop time and the motor stop distance in consideration of the dynamic brake switching speed, which is the boundary point where the dynamic brake characteristics by the dynamic brake resistance and the dynamic brake characteristics by the switching element are reversed. Since the brake system can be selected, the motor stop time and the motor stop distance at the time of emergency stop can be greatly shortened (for example, minimized).
- Embodiment 2 a motor control device 100i according to the second embodiment will be described. Below, it demonstrates focusing on a different part from Embodiment 1.
- FIG. 1 a motor control device 100i according to the second embodiment will be described. Below, it demonstrates focusing on a different part from Embodiment 1.
- the motor control device 100 i has a configuration in which the motor speed calculation unit 5 (see FIG. 1) is omitted in accordance with the fact that the position detector ENC is not provided in the motor M. It has become.
- the brake switching control unit 6i receives a speed command from the speed command calculation unit 9 of the host controller 10 and performs processing using the speed command. That is, the brake switching control unit 6 i uses a speed command given from the host controller 10 as an alternative to the motor speed acquired from the motor speed calculation unit 5.
- the brake switching control unit 6i should compare the speed command given from the host controller 10 with the dynamic brake switching speed obtained from the switching speed value storage unit 7, and brake the motor M according to the comparison result.
- the dynamic brake is switched between the first dynamic brake 11 and the second dynamic brake 12. For example, when the motor speed is higher than the dynamic brake switching speed, the brake switching control unit 6i applies the first dynamic brake when the second dynamic brake 12 brakes the motor M and the motor speed is lower than the dynamic brake switching speed. 11 is switched so as to brake the motor M.
- the brake switching control unit 6i selects the second dynamic brake 12 when the motor speed is higher than the dynamic brake switching speed. That is, the brake switching control unit 6i deactivates the first dynamic brake 11 and activates the second dynamic brake 12. As a result, the second dynamic brake 12 controls the brake resistance circuit 2 to connect the dynamic brake resistors R21 to R23 between the plurality of motor terminals U, V, and W to brake the motor M.
- the brake switching control unit 6i selects the first dynamic brake 11 when the motor speed is lower than the dynamic brake switching speed. That is, the brake switching control unit 6i activates the first dynamic brake 11 and deactivates the second dynamic brake 12. As a result, the first dynamic brake 11 controls the inverter circuit 1 to turn on all phases of the plurality of P-side switching elements or all phases of the plurality of N-side switching elements, thereby braking the motor M. .
- FIG. 7 is a flowchart showing the operation of the motor control device 100i.
- step S22 the brake switching control unit 6i stops the control operation of the power conversion control unit 13, and acquires the speed command and the dynamic brake switching speed.
- the brake switching control unit 6 i acquires a speed command from the host controller 10 and acquires a dynamic brake switching speed from the switching speed value storage unit 7.
- step S23 the brake switching control unit 6i compares the speed command with the dynamic brake switching speed.
- step S24 the brake switching control unit 6i determines whether or not the speed command is higher than the dynamic brake switching speed.
- the brake switching control unit 6i advances the process to step S5, and when the speed command is equal to or lower than the dynamic brake switching speed (“No” in step S24). ]), The process proceeds to step S6.
- step S27 the brake switching control unit 6i determines whether or not the motor M has stopped. For example, the brake switching control unit 6i determines whether or not the elapsed time from the timing at which the dynamic brake operation is started exceeds a threshold time.
- the threshold time is a time (see FIG. 4) that is experimentally determined in advance according to the time from the start of the dynamic brake operation until the motor M stops.
- the brake switching control unit 6i ends the process, and when the elapsed time does not exceed the threshold time ("No" in step S27), the process Is returned to step S27.
- the brake switching control unit 6i uses the speed command given from the host controller 10 and the dynamic brake switching speed stored in the switching speed value storage unit 7 immediately after the emergency stop is started. Comparison is made, and either the first dynamic brake 11 or the second dynamic brake 12 is selected as a dynamic brake to brake the motor M according to the comparison result.
- a dynamic brake method suitable for shortening the motor stop time and the motor stop distance can be selected according to the speed command at the time of emergency stop start. Therefore, in a sensorless configuration or when performing sensorless control, Compared with the case where the brake system is fixed, the motor stop time and the motor stop distance at the time of emergency stop can be greatly reduced.
- the brake switching control unit 6 selects the second dynamic brake 12 when the speed command is higher than the dynamic brake switching speed, and the first command when the speed command is lower than the dynamic brake switching speed.
- the dynamic brake 11 is selected. This makes it possible to reduce the motor stop time and the motor stop distance in consideration of the dynamic brake switching speed, which is the boundary point where the dynamic brake characteristics by the dynamic brake resistance and the dynamic brake characteristics by the switching element are reversed. Since the brake method can be selected, the motor stop time and the motor stop distance at the time of emergency stop can be greatly shortened (for example, minimized) in the sensorless configuration or when performing sensorless control.
- step S24 shown in FIG. 7 the brake switching control unit 6i may determine whether or not the speed command is equal to or higher than the dynamic brake switching speed. In this case, when the speed command is equal to or higher than the dynamic brake switching speed (“Yes” in step S24), the brake switching control unit 6i advances the process to step S5, and when the speed command is less than the dynamic brake switching speed (step If “No” in S24), the process proceeds to step S6.
- the motor control device according to the present invention is useful for controlling the motor.
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Abstract
Description
実施の形態1にかかるモータ制御装置100について図1を用いて説明する。図1は、モータ制御装置100の構成を示す図である。モータ制御装置100は、電源(例えば、交流電源)PSから電力(例えば、3相交流電力)を受け、受けた電力に対して電力変換動作を行い、生成された駆動用の電力(例えば、3相交流電力)を用いてモータMを駆動し、モータMを含む各種機械を駆動する。
次に、実施の形態2にかかるモータ制御装置100iについて説明する。以下では、実施の形態1と異なる部分を中心に説明する。
Claims (7)
- 複数のP側スイッチング素子及び複数のN側スイッチング素子を有し、複数のモータ端子を介してモータを駆動するインバータ回路と、
前記複数のP側スイッチング素子の全相又は前記複数のN側スイッチング素子の全相をオンすることにより前記モータにブレーキをかける第1のダイナミックブレーキと、
前記複数のモータ端子の間にダイナミックブレーキ抵抗を接続して前記モータにブレーキをかける第2のダイナミックブレーキと、
モータ速度に応じて、前記モータにブレーキをかけるべきダイナミックブレーキを前記第1のダイナミックブレーキ及び前記第2のダイナミックブレーキの間で切り換える制御部と、
を備えたことを特徴とするモータ制御装置。 - 接続されたモータのモータ定数から算出されたダイナミックブレーキ切換え速度を記憶する切換え速度値記憶手段をさらに備え、
前記制御部は、位置検出器又は速度検出器を用いて検出されたモータ速度と、前記切換え速度値記憶手段に記憶されたダイナミックブレーキ切換え速度とを、非常停止開始から連続的に又は定期的に比較し、比較結果に応じて、前記モータにブレーキをかけるべきダイナミックブレーキを前記第1のダイナミックブレーキ及び前記第2のダイナミックブレーキの間で切り換える
ことを特徴とする請求項1に記載のモータ制御装置。 - 前記制御部は、モータ速度が前記ダイナミックブレーキ切換え速度より高い場合、前記第2のダイナミックブレーキが前記モータにブレーキをかけ、モータ速度が前記ダイナミックブレーキ切換え速度より低い場合、前記第1のダイナミックブレーキが前記モータにブレーキをかけるように、切り換える
ことを特徴とする請求項2に記載のモータ制御装置。 - 接続されたモータのモータ定数から算出されたダイナミックブレーキ切換え速度を記憶する切換え速度値記憶手段をさらに備え、
前記制御部は、位置検出器又は速度検出器を用いて検出されたモータ速度と、前記切換え速度値記憶手段に記憶されたダイナミックブレーキ切換え速度とを、非常停止開始直後に比較し、比較結果に応じて、前記モータにブレーキをかけるべきダイナミックブレーキとして前記第1のダイナミックブレーキ及び前記第2のダイナミックブレーキのいずれかを選択する
ことを特徴とする請求項1に記載のモータ制御装置。 - 前記制御部は、モータ速度が前記ダイナミックブレーキ切換え速度より高い場合、前記第2のダイナミックブレーキを選択し、モータ速度が前記ダイナミックブレーキ切換え速度より低い場合、前記第1のダイナミックブレーキを選択する
ことを特徴とする請求項4に記載のモータ制御装置。 - 接続されたモータのモータ定数から算出されたダイナミックブレーキ切換え速度を記憶する切換え速度値記憶手段をさらに備え、
前記制御部は、上位コントローラから与えられる速度指令と、前記切換え速度値記憶手段に記憶されたダイナミックブレーキ切換え速度とを、非常停止開始直後に比較し、比較結果に応じて、前記モータにブレーキをかけるべきダイナミックブレーキとして前記第1のダイナミックブレーキ及び前記第2のダイナミックブレーキのいずれかを選択する
ことを特徴とする請求項1に記載のモータ制御装置。 - 前記制御部は、速度指令が前記ダイナミックブレーキ切換え速度より高い場合、前記第2のダイナミックブレーキを選択し、速度指令が前記ダイナミックブレーキ切換え速度より低い場合、前記第1のダイナミックブレーキを選択する
ことを特徴とする請求項6に記載のモータ制御装置。
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US14/651,132 US9515581B2 (en) | 2012-12-13 | 2012-12-13 | Motor control device |
PCT/JP2012/082363 WO2014091602A1 (ja) | 2012-12-13 | 2012-12-13 | モータ制御装置 |
JP2014551805A JP5955414B2 (ja) | 2012-12-13 | 2012-12-13 | モータ制御装置 |
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US9515581B2 (en) | 2016-12-06 |
US20150326151A1 (en) | 2015-11-12 |
TW201424246A (zh) | 2014-06-16 |
TWI504132B (zh) | 2015-10-11 |
JP5955414B2 (ja) | 2016-07-20 |
JPWO2014091602A1 (ja) | 2017-01-05 |
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