JP2011200073A - Motor drive - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that electric energy cannot be reduced at standby by a conventional technology because there exists no signal input for clearly determining whether a motor is moving or stopped, relating to a motor drive in which, with no clear move/stop signal of a motor present, a detected rotational speed of the motor is transmitted to a higher-order device, and the higher-order device transmits a signal corresponding to an acceleration/deceleration command to the motor according to the rotational speed, for controlling rotational speed of the motor.SOLUTION: A current is reduced by estimating that it is in standby mode when motor stop is recognized with a motor rotation detecting signal, with the acceleration/deceleration signal which is a motor control signal being inactive. With this configuration, a motor drive is realized in which power consumption is reduced even with such specification as no clear signal of motor stop is available, with no move/stop signal of a motor present.

Description

  The present invention relates to a drive device such as a brushless DC motor used in office equipment such as a copying machine and a printer, and more particularly, to provide a motor drive device that saves power during standby.

In recent years, awareness of environmental issues has increased, and in electrical products such as office equipment, demand for power-saving products has increased. In particular, there is an increasing demand for reduction of power consumption during standby without operating devices, and reduction of standby power of motors, which are main components of electric products, has become a problem.
Since many of these electrical products are expected to operate immediately with operation switches, power is always supplied even during standby, and each component including the motor consumes unnecessary power. . In response to this problem, a motor driving device that consumes power during standby is invented, and is disclosed in Patent Document 1 and the like.

FIG. 3 is a circuit diagram of a conventional motor driving apparatus. Input unit (Vcc) 301, input unit (GND) 302, start / stop input (ON / OFF) 303, control means 304, inverter 305, regulator (REG) 306, Hall element 307, motor 308, first semiconductor switching element (Q1a) 309 and the like.
The first semiconductor switching element (Q1a) 309 uses a PNP-type bipolar transistor.

  Main power (Vcc) is supplied from the main body to the input unit (Vcc) 301 and the input unit (GND) 302. A first semiconductor switching element (Q1a) 309 constituting a standby power saving circuit is connected to the input unit (Vcc) 301, and a regulator (REG) 306 is connected to the first semiconductor switching element (Q1a) 309. ing. The regulator (REG) 306 converts the main power supply (Vcc) into a low voltage and supplies the control power supply (Va) to the control means 304 and the Hall element 307.

The start / stop input (ON / OFF) 303 is supplied with “start command” and “stop command” from the main body. The start / stop input (ON / OFF) 303 is also connected to the start / stop input of the control means 304. The start / stop input (ON / OFF) 303 becomes a low impedance state (L) when “start command” is entered, and enters a high impedance state (H) when “stop command” is given.
The control unit 304 includes a motor control circuit such as a speed control circuit, a position detection circuit, and an energization switching circuit. The inverter 305 is means for supplying main power (VCC) to the motor 308, and drives the motor 308 according to the signal output from the control means 304 in accordance with the position detection signal of the Hall element 307.

  The main part of the standby power saving circuit is constituted by the first semiconductor switching element (Q1a) 309. The first semiconductor switching element (Q1a) 309 is turned on by the “start command” from the main body, and the regulator (REG ) 306 is configured to supply power to the first semiconductor switching element (Q1a) 309 in a non-conducting state in response to a “stop command” to stop power supply to the regulator (REG) 306.

  As a result, the first semiconductor switching element (Q1a) 309 is turned off by the “stop command”, whereby the power supply to the regulator (REG) 306 is stopped, and the control means 304 and the hall element 307 are turned off. Control power (Va) is not supplied, and power consumption during standby can be reduced.

When the “start command” is input from the main body, the first semiconductor switching element (Q1a) is turned on, power is supplied to the regulator (REG) 306, and the control means 304 and the hall element 307 are supplied with control power. (Va) is supplied, and at the same time, a “start command” is input to the control means 304, so that the motor 308 is driven.
JP 2000-069791 A

  However, the above-described prior art power reduction method for standby requires a signal input such as a start / stop input (ON / OFF) 303 that clearly indicates whether the motor is starting or stopping.

  For this reason, there is no clear start / stop signal, and the detected rotational speed of the motor is transmitted to the host device, and the host device transmits a signal corresponding to the acceleration / deceleration command to the motor according to the rotational speed. In the motor driving device that controls the rotational speed, there is no signal input that can clearly determine whether the motor is starting or stopping, and therefore the conventional technique cannot reduce power during standby.

  In addition, when starting from the standby time, the “start signal” is also input to the control means 304 simultaneously with the startup of the control power supply (Va), and the motor 308 starts to be driven. If noise such as chattering occurs, the motor 308 starts to be driven before the control power supply (Va) is stabilized, so that it may be in an unsafe state such as a short-circuit current of the inverter 305.

In the present invention, in order to solve the above problems,
A position detection circuit that processes a signal from a position detector that detects the positional relationship between the rotor magnet of the brushless motor and the drive coil, and a control unit that outputs the energization switching timing of the drive coil based on the detection result of the position detection circuit And a means for transmitting the rotational speed obtained from the speed detector for detecting the rotational speed of the brushless motor to a host device, an acceleration / deceleration input signal obtained from the device and a signal of the position detection circuit. A motor drive device using an integrated circuit comprising a determination circuit for determining the power supply circuit and a power supply circuit for generating a control power supply from a main power supply, wherein only the acceleration / deceleration input signal from the host device is used. In the motor drive device for controlling the rotation speed, the acceleration / deceleration input signal from the host device is in a non-acceleration state, and the block If Shiresumota determination circuit that has stopped is detected, to reduce the power consumption of the integrated circuit, characterized in that to reduce the standby power of the motor driving device.

  According to the present invention, a motor that transmits the detected rotation speed of the motor to the host device and controls the motor rotation speed only by a signal corresponding to acceleration / deceleration output from the host device according to the rotation speed. In a motor drive device that does not have a signal input that can clearly determine whether is a start or stop, it is possible to reduce power during standby.

1 is a circuit configuration diagram of a motor drive device according to a first embodiment. Operation waveform diagram in embodiment 1 Circuit diagram of a conventional motor drive device Operating waveform diagram of a conventional motor State diagram of motor acceleration / deceleration in Example 1 The circuit block diagram of the motor drive device in Example 2 Relationship diagram of motor output voltage with respect to torque command input voltage in embodiment 2

  Hereinafter, embodiments of the present invention will be described as examples with reference to the drawings.

FIG. 1 is a circuit configuration diagram in Embodiment 1 of the present invention.
As shown in FIG. 1, a control means 9, a regulator 6, a determination circuit 8, a position detection circuit 7, an integrated circuit 15 having a speed detection circuit 10, a position detector 11, a speed detector 14, an inverter 12, a motor 13, and an input A part (Vcc) 1, an input part (GND) 2, an acceleration command (ACC) 3, a deceleration command (DEC) 4, and an output part (FG) 5.

  The input unit (Vcc) 1 is input to the integrated circuit 15 as a power supply voltage, and a control power supply (Va) is generated by the regulator 6. The power supply voltage (Vcc) is input to the inverter 12 and used as a power supply for driving the motor 13. The position detector 11 is means for outputting according to the rotor position of the motor 13, and the output of the position detector 11 is input to the position detection circuit 7 to detect the rotor position of the motor 13. The speed detector 14 is a means for detecting the rotational speed of the motor 13 and is subjected to signal processing by the speed detection circuit 10 and output to the output unit (FG) 5. Here, the position detector 11 may serve as the speed detector 14, and the position detection circuit 11 may serve as the speed detection circuit 10.

  In the motor drive device of the present invention, the rotational speed of the motor 13 is detected by the speed detector 14, processed by the speed detection circuit 10, and then transmitted to the host device by the output unit (FG) 5. The host device compares the signal of the output unit (FG) 5 with the target speed set by the host device, and if the rotational speed of the motor is slower than the target speed, an acceleration command (ACC) 3 If the rotational speed of the motor is faster than the target speed, the L signal is transmitted to the deceleration command (DEC) 4. The voltage applied to the motor 13 by the control means 9 is determined according to the acceleration command (ACC) 3, the deceleration command (DEC) 4, and the rotational position of the motor 13 detected from the position detector 11. By applying a voltage to the motor 13 via the motor 13, the rotation of the motor 13 is controlled at the target rotational speed.

  With the configuration as described above, when the motor is stopped, the deceleration command (DEC) 4 is set to L to stop it stably, and when the motor is started, the deceleration command (DEC) 4 is set to H and the acceleration command (ACC) 3 Is set to L, the motor 13 is started, and the motor drive device accelerates the motor 13 to the target speed while transmitting the motor speed from the output unit (FG) 5 to the host device according to the motor speed. After that, when the host device detects that the motor 13 has exceeded the target speed by the output unit (FG) 5 signal, it sets the acceleration command (ACC) 3 to H, and sends the deceleration command (DEC) 4 and the acceleration command (ACC) 3 to the motor. The motor speed is controlled by setting one of them to L in accordance with the signal from the output unit (FG) 5 representing the speed. When it is desired to stop the motor, the host device outputs a deceleration command (DEC) 4 and decelerates until the motor 13 stops. After the motor 13 stops, the host device outputs the deceleration command (DEC) 4 and outputs the motor. It is common to stop.

  In other words, in the motor drive device having such a configuration, since it is not possible to obtain a clear motor drive / stop command from the host device, whether the host device wishes to stop the motor from the signal from the host device in the motor drive device. It is necessary to determine whether you want to drive.

Here, in the present invention, even if there is no clear stop / start signal from the host device, the host device stops the motor 13 from the rotation speed of the motor 13 in addition to the acceleration command (ACC) 3 and the deceleration command (DEC) 4. The mode is characterized in that the desired mode is determined and the power consumption is reduced.

  The state of acceleration / deceleration of the motor 13 by the combination of the acceleration command (ACC) 3 and the deceleration command (DEC) 4 in the motor drive device of this configuration is as shown in FIG. That is, if the acceleration command (ACC) 3 / deceleration command (DEC) 4 is L / H, the motor 13 accelerates, and if the acceleration command (ACC) 3 / deceleration command (DEC) 4 is H / L, the motor 13 is accelerated. If the acceleration command (ACC) 3 / deceleration command (DEC) 4 is L / L, the motor 13 stops in the short brake mode, and the acceleration command (ACC) 3 / deceleration command (DEC) 4 becomes H / If it is H, the motor 13 does not accelerate or decelerate and maintains the current state. From such an input condition, the host device stops the motor 13 and the mode for reducing the power consumption of the motor drive device is the acceleration command (ACC) 3 / deceleration command (DEC) 4 of H / L and H / H. It can be said that it is in a state. However, since such an input condition occurs even in a deceleration operation to a speed lower than the current speed, it is not possible to enter a standby state by only combining the acceleration command (ACC) 3 and the deceleration command (DEC) 4 as it is. . Therefore, the rotation state of the motor 13 detected from the position detector 11 is added to the condition, the motor 13 is stopped, and the acceleration command (ACC) 3 / deceleration command (DEC) 4 is maintained in the current state of H / H. Then, the motor driving device is put in a standby state. When the host device wants to continue driving the motor 13, if the motor 13 stops, the acceleration command (ACC) 3 is always output. That is, a state in which the host device does not output the acceleration command (ACC) 3 even though the motor 13 is stopped is a state in which the host device wants to stop the motor 13. Therefore, stable power consumption reduction can be realized by entering a standby mode that reduces power consumption of the motor drive device including the integrated circuit 15 at this timing. At this time, the output of the regulator 6 may be stopped, and the power supply to the position detector 11 or the like may be stopped.

The standby mode is canceled immediately when the acceleration command (ACC) 3 / deceleration command (DEC) 4 is in a condition other than H / H, and the control power supply (Va) is established and integrated. It is assumed that the motor driving device returns to a state in which the motor 13 can be normally driven after a waiting time of a certain time (about several hundred μs) for the circuit 15 to stably start the motor.
In this way, even in a motor drive device that does not have an input signal that can clearly determine whether the motor 13 is activated or stopped, the power consumption of the motor drive device can be reduced during the standby mode. Even when the motor 13 is rotated by an external force, the standby mode can be canceled at the will of the host device without canceling the standby mode, and the control power supply (Va) is activated from the cancellation of the standby mode until the motor 13 is started. Since the waiting time until the integrated circuit 15 is stabilized is provided, the motor 13 can be started safely.

  FIG. 6 is a circuit configuration diagram in Embodiment 2 of the present invention.

  As shown in FIG. 6, a control means 609, a regulator 606, a determination circuit 608, a position detection circuit 607, an integrated circuit 615 having a speed detection circuit 610, a position detector 611, a speed detector 614, an inverter 612, a motor 613, an input Part (Vcc) 601, input part (GND) 602, torque input command (VSP) 603, and output part (FG) 605.

The input unit (Vcc) 601 is input to the integrated circuit 615 as a power supply voltage, and the control power supply (Va) is generated by the regulator 606. The power supply voltage (Vcc) is input to the inverter 612 and used as a power supply for driving the motor 613. The position detector 611 is means for outputting according to the rotor position of the motor 613, and the output of the position detector 611 is input to the position detection circuit 607 to detect the rotor position of the motor 613. The speed detector 614 is a means for detecting the rotational speed of the motor 613, and is subjected to signal processing by the speed detection circuit 610 and output to the output unit (FG) 605. Here, the position detector 611 may serve as the speed detector 614, and the position detection circuit 611 may serve as the speed detection circuit 610. The torque input command (VSP) 603 is a torque command value, and the voltage applied to the motor 613 is determined according to the value of the torque input command (VSP) 603 and the voltage is applied to the motor 613 via the inverter 612. Thus, the motor 613 is controlled to rotate at the target rotational speed. Here, the output of the motor 613 is increased if the torque input command (VSP) 603 is large, and the output of the motor 613 is decreased if the torque input command (VSP) 603 is small.

  The motor driving device of the present invention detects the rotational speed of the motor 613 by the speed detector 614, and after processing by the speed detection circuit 610, the output unit (FG) 605 transmits the rotational speed of the motor 613 to the host device. The host device compares the signal of the output unit (FG) 605 with the target speed set by the host device, and if the rotational speed of the motor is slower than the target speed, a torque input command (VSP) If the motor rotation speed is higher than the target speed, the torque input command (VSP) 603 is decreased. In accordance with this torque input command (VSP) 603, the control means 609 determines the applied voltage to the motor 613 and applies the voltage to the motor 13 via the inverter 12, thereby controlling the motor 13 at the target rotational speed. It is.

  With the above configuration, when the motor is stopped, the torque input command (VSP) 603 is set to 0% or less of the torque threshold value to stop the motor 613, and when the motor is started, the torque input command (VSP) 603 is increased to 0%. By starting voltage application to the motor 613 by setting the threshold value or more, the motor 613 is started and accelerated to the target speed. Usually, in order to realize a stable 0% output, the 0% threshold value is set with an offset of several volts instead of 0 volts. After that, when the host unit detects that the motor 613 has exceeded the target speed by the output unit (FG) 605 signal, the torque input command (VSP) 603 is operated to input torque so that the target speed and the output unit (FG) 605 are balanced. By operating the command (VSP) 603, the motor 613 is stably controlled at the target speed.

  When it is desired to stop the motor 613, the torque input command (VSP) 603 is set to a threshold value equal to or lower than the 0% threshold value to reduce the applied voltage to the motor 613 and stop the motor 613. Even after the motor 613 stops, the host device keeps the motor 613 stopped by keeping the torque input command (VSP) 603 below the 0% threshold.

  That is, in the motor drive device having such a configuration, a clear motor drive / stop command cannot be obtained from the host device, so the host device wants to stop the motor 613 by a signal from the host device in the motor drive device. It is necessary to determine whether it is desired to drive.

  Here, in the present invention, in addition to the torque input command (VSP) 603 from the host device, in addition to the rotational speed of the motor 613, the host device determines the mode in which the motor 613 is to be stopped, and sets the mode to reduce power consumption. There is a feature. In the motor drive device of this configuration, even if the torque command (VSP) is less than the 0% threshold value, it is not possible to determine whether the motor 613 is to be stopped or to be decelerated, so only the torque command (VSP) 603 is on standby. It cannot be put into a state. Therefore, in addition to the condition that the torque command (VSP) 603 is equal to or less than the 0% threshold value, the torque command value (VSP) 603 is not changed even when the motor 613 is stopped from the rotation state of the motor 613 detected by the position detector 611. If the threshold is 0% or less, stable power consumption reduction can be realized by entering a standby mode for reducing power consumption of the motor drive device including the integrated circuit 615. At this time, the output of the regulator 606 may be stopped, and the power supply to the position detector 611 or the like may be stopped.

The standby mode is canceled when the torque command value (VSP) 603 exceeds the 0% threshold value, the control power supply (Va) is established, and the integrated circuit 615 can start the motor stably. It is assumed that the motor drive device returns to a state in which the motor 613 can be normally driven after a certain waiting time (several hundreds μs).

  In this way, even in a motor driving device that does not have an input signal that can clearly determine whether the motor 613 is starting or stopping, the power consumption of the motor driving device can be reduced during the standby mode. Even when 613 is rotated by an external force, it is possible to cancel the standby mode at the will of the host device without canceling the standby mode, and the control power supply (Va) from the cancellation of the standby mode to the start of the motor 13 Since the waiting time until the integrated circuit 615 is stabilized is provided, the motor 613 can be started safely.

  According to the present invention, it is possible to provide a motor driving device capable of reducing power consumption even in a specification in which there is no motor stop activation signal and a clear signal of motor stop cannot be obtained.

1 Input section (Vcc)
2 Input section (GND)
3 Acceleration command (ACC)
4 Deceleration command (DEC)
5 Output section (FG)
6 regulator 7 position detection circuit 8 determination circuit 9 control means 10 speed detection circuit 11 position detector 12 inverter 13 motor 14 speed detector 15 integrated circuit

Claims (2)

A position detection circuit that processes a signal from a position detector that detects the positional relationship between the rotor magnet of the brushless motor and the drive coil, and a control unit that outputs the energization switching timing of the drive coil based on the detection result of the position detection circuit And a means for transmitting the rotational speed obtained from the speed detector for detecting the rotational speed of the brushless motor to a host device, an acceleration / deceleration input signal obtained from the host device and a signal of the position detection circuit. And a motor driving device using an integrated circuit including a determination circuit for determining the rotational speed of the brushless motor including starting and stopping only from an acceleration / deceleration input signal from the host device. , The acceleration / deceleration input signal from the host device is not an acceleration command, and the brushless motor is stopped. If preparative determination circuit detects a motor drive device, characterized in that to reduce the power consumption of the integrated circuit. A position detection circuit that processes a signal from a position detector that detects the positional relationship between the rotor magnet of the brushless motor and the drive coil, and a control unit that outputs the energization switching timing of the drive coil based on the detection result of the position detection circuit And a means for transmitting the rotational speed obtained from the speed detector for detecting the rotational speed of the brushless motor to the host device, a speed command signal obtained from the host device and a signal of the position detection circuit to determine the driving state A motor driving device using an integrated circuit including a determination circuit that controls a rotational speed including starting and stopping of the brushless motor only from a torque command signal from the host device. The judgment circuit detects that the torque command from the device is a 0% command and that the brushless motor has stopped. Once, a motor drive device, characterized in that to reduce the power consumption of the integrated circuit.