JPH09252587A - Motor controller and image recorder with the motor controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a very reliable motor controller which, being simple- structured at low cost, can shorten a start-up time and can eliminate a bad start-up even if load torque increases and also provide an image recorder with such a motor controller. SOLUTION: This motor controller has a power supply 1 for driving a motor and a power supply 2 for controlling. An engine controller 34 generates a first supply voltage change signal S1 at the start-up of a motor 4. An FET 9 is on/off-controlled by the signal S1 through a usual feedback circuit and IC8 for controlling a power supply, and the output voltage of the power supply 1 for driving a motor is increased and then a start-up time for the motor 4 is shortened. When the motor 4 reaches a specified rotating speed, a second supply voltage change signal S2 is generated and the output voltage of the power supply 1 is changed again in response to the signal S2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a page printer,
The present invention relates to a motor driving device and an image recording device mounted in an image recording device such as a copying machine and a facsimile device, and particularly to a motor driving device and an image recording device for improving the starting characteristics and load fluctuation characteristics of the motor.

[0002]

2. Description of the Related Art Conventionally, as a power source for a motor control device in an image recording apparatus such as a laser printer, a main motor, a scanner motor, a fan motor or the like is usually used to drive a motor (12 V, etc.) and a motor control (5 V, etc.) ) Dual output power supply is used. These power supply output voltages are feedback-controlled so as to be constant following changes in load. Therefore, the voltage is controlled to be constant even when a large amount of electric power is required such as when the motor is started, and the current value flowing through the motor is controlled by the current limiting resistor so as not to exceed a certain value. Therefore, even when a large amount of electric power is required, the electric power input to the motor is constant, and the starting characteristic is determined by the capacity of the motor.

In addition to such a dual output power supply,
In order to improve the starting characteristics, there is a three-output power supply which is provided with a second motor drive power supply that outputs a voltage higher than the power supply voltage of the motor drive power supply and is capable of supplying a high voltage when starting the motor.

FIG. 4 shows a circuit configuration of an example of the three-output power source. Here, 1 is a motor driving power source, 2 is a motor control power source 2, 3 is a motor starting power source, and a voltage (15V) higher than the motor driving voltage power source when the motor 4 is started.
Is applied to improve the starting characteristics.

In this device, 5 is an AC power source,
The AC voltage is full-wave rectified by the diode bridge 6,
It is smoothed by the smoothing capacitor 7. Reference numeral 8 denotes a power supply control IC incorporating a duty ratio control means for controlling the duty ratio of the power supply control voltage. The voltage divided by the start resistors 9a and 9b of the power supply control IC 8 is applied to the VCC terminal. Is started. After power activation, power control IC
The output out of 8 is applied to the gate of the FET 9 as a switching element to turn on / off the FET 9. The on / off duty ratio can be changed by the duty ratio control means. When the FET 9 is on, a voltage determined by the winding ratio of the main winding 10 and the auxiliary winding 11 of the transformer is applied to the capacitor 13 via the diode 12, and the capacitor 13 is charged to start the power supply. It is used as an auxiliary power source for the subsequent power source control IC 8. At the same time, when the FET 9 is on, the diodes 14, 15, 16
Through the main winding 10 and the secondary winding 17, 18,
A choke coil 20, 21, 22 and capacitors 23, 24, 25 are generated by a voltage represented by a winding ratio with respect to 19.
Are charged respectively.

When the FET 9 is off, when the FET 9 is on, the energy stored in the choke coils 20, 21, 22 passes through the regenerative diodes 26, 27, 28,
The capacitors 23, 24 and 25 are respectively charged.

Reference numeral 29 denotes a shunt regulator, which supplies a current from its cathode to its anode so that the voltage ref obtained by dividing the 5V voltage of the control power supply 2 by the feedback resistors 30 and 31 becomes equal to the internal reference voltage of the shunt regulator 29. Shed. Reference numeral 32 is a resistor that limits the current flowing through the shunt regulator 29, and 33 is a photocoupler. When a current flows through the light emitting portion 33a of the photocoupler 33 through the resistor 32 and the shunt regulator 29, light is emitted, and when the light is received, the light receiving portion 33b is turned on, and G is fed from the feedback terminal FB of the power control IC 8
Current flows out toward ND. The power supply control IC 8 stabilizes the control power supply 12 by controlling the on / off duty ratio of the FET 9 according to this current.

Here, 100 is an image recording engine, 34
Is an engine controller for controlling the image recording engine 100. Upon receiving the print start command from the host computer 200, the engine controller 34 turns on the transistors 35 and 36 and applies a high voltage to the motor 4 via the motor driving power source 3. As a result, the motor 4 is activated and the printing operation is started. As the amount of electric power supplied to the motor 4 increases, the amount of change in the number of revolutions per hour after the start of startup is large, so that the startup time is short and the generated torque is large.

The motor 4 is the main motor for driving the engine, and the motor driver 37 is the motor 4
Using the rotation speed detection signal S2 from the rotation detection means such as the Hall element, the power supply 1 is controlled to be turned on and off so that the actual rotation speed of the motor 4 becomes the same as the target rotation speed.

Reference numeral 38 denotes a current limiting resistor, which stops the motor driver 37 from turning on when a current more than a constant current flows through the motor 4 when the load torque of the motor 4 is large such as at the start of printing. And to prevent the motor 4 from being damaged by heat generation or the like. When the motor 4 reaches the specified rotation speed, the current consumption decreases, and the motor driver 37 sends the RDY signal to the engine controller 3 at the same time.
Output to 4. When the engine controller 34 detects the RDY signal after starting the activation, the transistor 3
Only 6 is turned off, the power supply 3 for starting the motor is shut off, and the power is supplied to the motor 4 only from the power supply 1 for driving the motor, whereby the voltage applied to the motor 4 is lowered to a steady state.

Reference numeral 39 is a backflow prevention diode for preventing a current from flowing from the power source 3 to the power source 1.

[0012]

The longer the starting time of the motor, the longer the time from the start of printing to the discharge of the image forming apparatus of this type (hereinafter referred to as the first print time).
However, in recent years, in order to shorten the first print time as much as possible, it is strongly desired to start up in a short time. In addition, if the load torque increases due to changes in the motor over time, etc., the start-up time will increase accordingly. Alternatively,
Motors with small inertia such as fan motors and scanner motors are prone to start-up failure even if a small amount of foreign matter is present in the bearing.

As described above, if the motor does not reach the steady rotation speed within a predetermined time, it is determined that the motor is out of order, the motor is stopped, and the printing operation cannot be performed thereafter.

However, in order to cope with the device failure due to the start failure when the load torque increases due to the shortening of the first print time and the change over time, in the conventional example shown in FIG. 4, a high voltage (15 V or the like) is applied to the motor 4. However, in this case, the cost is increased accordingly.

Therefore, an object of the present invention is to make it possible to shorten the starting time of the motor even with a simple and inexpensive structure, and to avoid starting failure even if the load torque increases. And a highly reliable motor control device and a motor control device.

[0016]

According to the present invention, there is provided a motor drive power source for supplying drive power to a motor, a first means for variably controlling an output voltage from the motor drive power source, and a method for starting the motor. Second means for generating a first power supply voltage change signal for giving an instruction to change the output voltage from the motor drive power supply; and the output voltage when the rotation speed of the motor reaches a predetermined rotation speed. Third means for generating a second power supply voltage change signal for giving an instruction to change again, and controlling the first means in response to the first power supply voltage change signal to change the output voltage, and And a fourth means for controlling the first means to change the output voltage again in response to the second power supply voltage change signal from the third means.

Further, according to the present invention, the fifth means for detecting that the motor has not reached the predetermined number of revolutions when a predetermined time has elapsed from the start of starting the motor, and the fifth means Sixth means for generating a third power supply voltage change signal when the motor has not reached the predetermined number of revolutions in response to the detection output of, and the first means in response to the third power supply voltage change signal. And a seventh means for controlling the means to restart the motor.

Further, in the present invention, the motor drive power source has a switching element for changing its duty ratio, and the first means controls the switching element to change the duty ratio to drive the motor. It is also possible to change the output voltage of the voltage.

Further, according to the present invention, the second means may be constructed by incorporating an engine controller for generating the first power supply voltage change signal in response to an instruction to start the motor.

Further, according to the present invention, the output voltage from the motor drive power source is supplied to the motor through a motor driver, and the rotation speed detection output from the motor is supplied to the motor driver so that the motor is driven by the motor. A ready signal may be generated as the second power supply voltage change signal when the predetermined number of rotations is reached, and the ready signal may be supplied to the engine controller.

In the present invention, the first and second power supply voltage changing signals from the engine controller may be supplied to the first means via a photo coupler.

Further, in the present invention, the motor drive power supply for supplying drive power to the motor, the output voltage from the motor drive power supply is supplied to the motor, and the detection output of the rotation speed is received from the motor to receive the output. A motor driver that generates a ready signal when the motor reaches a predetermined number of revolutions, and a resistor that is connected in series with the motor and flows a drive current of the motor, and the terminal voltage of the resistor is the motor driver. First resistor for supplying a constant drive current to the circuit, a circuit consisting of a switching element and a second resistor connected in parallel with the first resistor, and connected to the motor driver in advance after starting the motor. When the ready signal is not generated when a predetermined time has elapsed, the switching element is turned on, and the drive current of the motor is applied to the first and second resistors. It is possible to configure the motor control device without to flow in a parallel circuit with a control means so as to increase the drive current of the motor that.

In the present invention, the first means, the second means, the third means, and the fourth means may be provided, and the ready signal may be the second power supply voltage change signal. .

In the present invention, the second power supply voltage changing signal may not be generated when the motor is physically restrained and the load torque increases.

Further, in the present invention, when the motor is physically restrained and the load torque increases, the ready signal may not be generated.

Further, according to the present invention, the image recording means, the image recording control means for controlling the image recording means, and the motor control device are provided, and the image recording means is driven by the motor to perform the image recording. The image recording apparatus can be configured so that the first power supply voltage change signal is generated at the start of the image recording operation in the control means.

Further, according to the present invention, the image recording means, the image recording control means for controlling the image recording means, and the motor control device are provided, and the image recording means is driven by the motor to perform the image recording. The image recording apparatus can be configured so that the first power supply voltage change signal is generated at the start of the image recording operation in the control means.

Further, in the present invention, the switching element may be composed of an FET.

In the present invention, the motor driving power source supplies a rectified output obtained from an AC input to the transformer via the switching element, rectifies the secondary side output of the transformer, and It may be configured such that drive power for driving the motor is taken out.

Further, according to the present invention, a power source for controlling the motor control device may be provided on the secondary side of the transformer.

[0031]

Embodiments of the present invention will be described below in detail with reference to the drawings.

As a first embodiment of the present invention, an example of a motor power supply device for supplying electric power to a motor of an image recording apparatus will be described with reference to FIGS. 1 and 2. In FIG. 1, the same parts as those in the conventional example shown in FIG. 4 are designated by the same reference numerals, and the description thereof will be omitted.

In FIG. 1, the motor drive power source 1 and the control power source 2 shown in FIG. 4 are the same, but the engine controller 34 as the image recording control means is
A voltage change signal S1 for changing the voltage of the power supply 1 from 12V to 15V is generated at the time of starting. This voltage change signal S
1 is supplied to the base of the transistor 43. The emitter of the transistor 43 is grounded via the resistor 44, and the collector is connected to the voltage dividing point of the voltage divider formed by the resistors 30 and 31. Voltage divider 30, 31, resistor 32, and shunt regulator 29
The circuit configuration of the photo coupler 33 and the photo coupler 33 is similar to that of FIG. The output from the photocoupler 33 is connected to the FB terminal of the power control IC 8, and the output OUT of this power control IC 8 is output.
Is also similar to FIG.

The RDY signal from the motor driver 37 is supplied to the engine controller 34.

The motor driver 37 receives the rotation speed detection signal S2 from the rotation speed detection means such as a hall element incorporated in the motor 4, and the actual rotation speed of the motor 4 becomes equal to the target rotation speed. As described above, the power supply output from the power supply 1 is turned on and off to supply power to the motor 4. When the motor 4 reaches the target rotation speed, its current consumption decreases, and the voltage across the terminals of the current detecting resistor 38 decreases. The voltage between the terminals is applied to the current detection input terminal CS of the motor driver 37.
In response to the CS output and the detected rotation speed detection signal S2, the motor driver 37 generates a ready signal RDY indicating that the motor is in a steady state and can be used.

A motor 4 as a main motor is connected to the motor driver 37, and a current control resistor 38 is connected to the motor 4. This current limiting resistor 38 is
If a current larger than a certain current flows when the torque of the main motor 4 is large such as when printing is started, the motor driver 3
This is to prevent the motor 7 from being turned on and prevent the motor driver 37 and the main motor 4 from being destroyed by heat generation or the like.

The circuit configured as described above is used for the motor 4
A process of increasing the output voltage for driving the power supply will be described. When the printer starts the printing operation from the standby state, the voltage change signal S1 output from the engine controller 34 is set to the high level. When the voltage change signal S1 becomes high level, the transistor 43 is turned on. By turning on the transistor 43, the resistor 44 is connected in parallel to the resistor 31, and the resistor 30,
The value ref divided by 31 and 44 becomes lower than the reference or reference voltage in the shunt regulator 29. In response, the current flowing from the cathode to the anode of shunt regulator 29 is reduced so as to increase the actual voltage on the 5V voltage line.

When the current flowing through the light emitting portion 33a of the photocoupler 33 decreases, the outflow current from the feedback terminal FB of the power control IC 8 decreases, so that the duty ratio of the on / off control of the FET 9 increases and the diodes 14 and 26 operate. The power that is rectified and charged in the choke coil 20 and the capacitor 23 increases, and as a result, the average output voltage of the motor driving power source 1 increases. In this way, the motor 4 is started and the rotation speed of the motor 4 increases.

Regarding the output voltage of the control power supply 2, the voltage ref obtained by the output voltage through the voltage dividers 30 and 31 is fed back by comparing the reference voltage of the shunt regulator 37 with a constant value of 5V. Is kept at.

The motor driver 37 outputs an RDY signal to the engine controller 34 when the motor 4 reaches the specified rotation speed. In this way, when the RDY signal output when the motor 4 is in steady rotation is input to the engine controller 34, the transistor 43 is turned off, and as a result, the duty ratio of the on / off control of the FET 9 is lowered. Then, the output voltage of the power supply 1 is returned to the steady state.

FIG. 2 shows a case (c) of the present embodiment in which the output voltage of the power supply 1 is raised at the start of the above-mentioned start-up to shorten the start-up time, and a case of the conventional example having no separate power supply (a). )
And (b) in the case of the conventional example having another power source for start-up, the time change of the voltage applied to the motor 4 and the rotation speed of the motor 4 are compared and shown.

As shown in FIG. 2 (c), in the embodiment of the present invention, another power source for starting the motor 4 is provided by raising the power source voltage of the power source 1 to 15 V only at the start of the startup. The same effect as that of the conventional example shown in FIG. 2B can be obtained. According to this embodiment, the motor start-up time can be shortened and the first print time of the apparatus can be shortened.

In the present embodiment, the present invention has been described for the case of the main motor 4, but the present invention can be similarly applied to other motors such as a scanner motor. Further, it goes without saying that the optimum ratio of the rising voltage is determined according to the ratings of the components in the device and the motor used.

Next, a second embodiment of the present invention will be described.

In the second embodiment, the output voltage is increased when the motor 4 does not reach the steady rotation speed even after a lapse of a predetermined time from the start of start-up. Different from the embodiment.

It is considered that when the load torque increases due to a change with time or the like, the starting time becomes longer due to the heavy load. In particular, in the case of a motor having a small inertia such as a fan motor or a scanner motor, even a small amount of foreign matter in the bearing portion causes a large load and a start failure is likely to occur. If the motor 4 does not reach the steady-state rotation speed within a predetermined time due to such a start-up failure, the engine controller 34 determines that the motor is out of order, and the motor 4 is stopped.
Cut off the power supply to. Therefore, the printing operation thereafter cannot be performed.

Therefore, when the RDY signal indicating that the motor 4 has reached the steady-state rotation speed is not output within a predetermined time from the start of starting the motor 4, the engine controller 34 supplies a voltage to instruct the restart. The change signal S1 is output, the transistor 43 is turned on, and the motor 4
The voltage applied to is increased. When the voltage applied to the motor 4 rises, the current flowing through the motor 4 increases,
Therefore, the generated torque increases.

Therefore, by doing so, even when the load torque increases due to a slight foreign substance in the bearing,
By extending the start-up time and restarting, it is possible to prevent a start-up failure and improve the reliability of the apparatus without using a motor having an extra margin. It is obvious that the number of restart operations can be determined by the device, and there is no restriction on the number. Alternatively, if the RDY signal is not output from the motor 4 even after the restart operation is performed as described above, it may be determined as a failure.

Next, a third embodiment of the present invention will be described with reference to FIG. Here, when the motor 4 has not reached the steady-state rotation speed even after a lapse of a predetermined time from the start of activation, the current supplied to the motor 4 is increased to increase the output of the motor 4.

In FIG. 3, the motor 4 is connected with a current detecting resistor 50 as current detecting means for detecting the current flowing through the motor 4, and the voltage drop at the resistor 50 is applied to the CS terminal of the motor driver 37. It is applied and controlled so that the voltage drop at the resistor 50 becomes constant. A series circuit of a transistor 52 and a resistor 53 is connected in parallel with the current detecting resistor 50 between the current detecting resistor 50 and the engine controller 34. The transistor 52 is turned on by the current change signal S3 from the engine controller 34, and the resistor 53 is connected in parallel with the current detection resistor 50 to reduce the resistance value for current detection.

The engine controller 34 supplies the current change signal S3 to the transistor 52 when the RDY signal does not occur when a predetermined time has elapsed since the motor 4 was started.

In FIG. 3, reference numeral 41 denotes an AC-DC converter 54, which is connected to the AC power source 5 and has a circuit configuration corresponding to the power sources 1 and 2 shown in FIG. is there.

By incorporating the circuits 8, 9, 29 to 33, 43, and 44 shown in FIG. 1 in the AC-DC converter 54 of FIG. 3, the voltage from the engine controller 34 is supplied as in the first embodiment. The voltage of the power supply 1 is changed to 12 by the change signal S1.
Of course, the voltage may be changed from V to 15V.

In the motor drive device constructed as described above, if the motor driver 37 does not output the RDY signal indicating that the steady rotation speed has been reached even after a predetermined time has elapsed after the motor 4 is started, the engine controller A current change signal S3 is output from 34, and the signal S3 turns on the transistor 52 to connect the resistor 53 in parallel with the resistor 50 to reduce the resistance value of the resistor connected to the CS terminal of the motor driver 37. Increase the value of the current passed through 4. When the current flowing into the motor 4 increases, the torque generated by the motor 4 increases. Therefore, even a small amount of foreign matter in the bearing can prevent the start-up failure from occurring when the load torque increases. As a result, the reliability of the motor drive device can be improved without using a motor having an extra margin.

The number of restart operations can be determined according to the device, and there is no particular restriction on the number of restart operations.
If the RDY signal is not output from the motor 4 even after a predetermined number of restart operations, such as once or a plurality of times, it may be determined as a failure.

[0056]

As is apparent from the above, according to the present invention, the output voltage is changed by changing the duty ratio of the power supply circuit in response to the start command of the motor to control the start state of the motor. Since it is performed, it is not necessary to provide a separate power supply for start-up, so that the start-up time of the motor can be shortened with an inexpensive configuration, and when a predetermined time has elapsed after the start of start-up. Even if the load torque increases for some reason, it is possible to reduce the occurrence of start failure by determining that the start has not been completed and instructing restart when the motor has not reached the steady speed. .

[Brief description of drawings]

FIG. 1 is a circuit diagram showing first and second embodiments of the present invention.

FIG. 2 shows a relationship between a motor voltage and a motor rotation speed with respect to a time axis, comparing a conventional case and a case of the present invention, and (a) shows a case of a conventional example in which a power supply circuit does not have another power supply. , (B) are waveform diagrams showing the case of the conventional example having another power supply in the power supply circuit and (c) of the present invention.

FIG. 3 is a circuit diagram showing a third embodiment of the present invention.

FIG. 4 is a circuit diagram showing a configuration of a conventional example of a motor control power supply circuit of an image recording apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Driving power supply 2 Control power supply 4 Motor 8 Power supply control circuit 9 Switching element (FET) 34 Image forming control means (engine controller) 43 Transistor 44 Resistance 50 Current detection resistance 52 Transistor element 53 Resistance S1 Voltage change signal S2 Motor Rotation speed detection signal S3 Current change signal

Claims (18)

[Claims] 1. A motor drive power supply for supplying drive power to a motor, first means for variably controlling an output voltage from the motor drive power supply, and an output voltage from the motor drive power supply in association with starting of the motor. Second means for generating a first power supply voltage change signal for giving an instruction for changing the output voltage, and an instruction for changing the output voltage again when the rotational speed of the motor reaches a predetermined rotational speed. Third means for generating a second power supply voltage change signal, controlling the first means in response to the first power supply voltage change signal to change the output voltage, and the third means from the third means And a fourth means for controlling the first means to change the output voltage again in response to the two power supply voltage change signals. 2. A fifth means for detecting that the motor has not reached the predetermined number of rotations when a predetermined time has elapsed from the start of starting the motor, and a detection output from the fifth means. Responsive to sixth means for generating a third power supply voltage change signal when the motor has not reached the predetermined number of revolutions, and controlling the first means in response to the third power supply voltage change signal. The motor control device according to claim 1, further comprising: a seventh means for restarting the motor. 3. The motor drive power supply has a switching element for changing its duty ratio, and the first means controls the switching element to change the duty ratio to output the output voltage of the motor drive voltage. 3. The motor control device according to claim 1, wherein the motor control device is changed. 4. The second means is incorporated in an engine controller that generates the first power supply voltage change signal in response to an instruction to start the motor. The motor control device according to the item. 5. The output voltage from the motor drive power source is supplied to the motor via a motor driver, and a rotation speed detection output from the motor is supplied to the motor driver, and the motor determines the predetermined voltage. The motor control device according to claim 4, wherein a ready signal is generated as the second power supply voltage change signal when the number of revolutions is reached, and the ready signal is supplied to the engine controller. 6. The motor control according to claim 4, wherein the first and second power supply voltage change signals from the engine controller are supplied to the first means via a photocoupler. apparatus. 7. A motor drive power source for supplying drive power to the motor, an output voltage from the motor drive power source is supplied to the motor, and a detection output of the number of revolutions is received from the motor to determine the motor in advance. A motor driver that generates a ready signal when the number of rotations reaches, and a resistor that is connected in series with the motor and flows a drive current of the motor, and supplies a terminal voltage of the resistor to the motor driver. A circuit consisting of a first resistor for keeping the drive current constant, a switching element and a second resistor connected in parallel with the first resistor, connected to the motor driver, and a predetermined time after the motor is started. The switching element is supplied with a current change signal instructing to change the drive current when the ready signal is not generated when And a control means for increasing the drive current of the motor by allowing the drive current of the motor to flow in the parallel circuit of the first and second resistors. Control device. 8. The first means, the second means, the third means, and the fourth means according to claim 1, wherein the ready signal is the second power supply voltage change signal. The motor control device according to claim 7. 9. The method according to claim 1, wherein the second power supply voltage changing signal is not generated when the motor is physically restrained and the load torque is increased. The motor control device according to. 10. The motor control device according to claim 7, wherein the ready signal is not generated when the motor is physically restrained and the load torque increases. 11. An image recording means, an image recording control means for controlling the image recording means, and a motor control device according to claim 1, wherein the image recording is performed by the motor. The image recording apparatus is characterized in that the first power source voltage change signal is generated when the image recording control means starts the image recording operation. 12. An image recording means, an image recording control means for controlling the image recording means, and a motor control device according to claim 7, wherein the image recording means is driven by the motor to perform the image recording. An image recording apparatus, wherein the first power supply voltage change signal is generated at the start of an image recording operation in the control means. 13. The motor control device according to claim 3, wherein the switching element is a FET. 14. The image recording apparatus according to claim 11, wherein the switching element is a FET. 15. The motor driving power source rectifies an AC input, supplies the rectified output to a transformer via the switching element, rectifies a secondary side output of the transformer to drive the motor. The motor control device according to any one of claims 3 to 6 and 9, characterized in that drive power for driving is taken out. 16. The motor driving power source rectifies an AC input, supplies the rectified output to a transformer through the switching element, rectifies a secondary side output of the transformer to drive the motor. 12. The image recording apparatus according to claim 11, wherein the driving power for driving is taken out. 17. The power source for controlling the motor control device is provided on the secondary side of the transformer.
The motor control device according to any one of the preceding claims. 18. A power source for controlling the motor control device is provided on a secondary side of the transformer.
The image recording apparatus described.