motor – Page 2 – Experimental Engineering

Posted on August 5, 2010 by The Engineer — Leave a comment

HP Photosmart 375

This is a HP PhotoSmart 375 portable photo printer. With built in card reader, screen & PictBridge.
Top of the printer showing the UI Buttons & Screen.

Front of the unit, card reader slots at the top, Pictbridge USB connector at top left. Paper out slot at bottom. Cartridge door is on the right.

Here the cartridge door is open. Takes HP 95 Tri-Colour Inkjet Cartridge.

Battery compartment on the bottom of the unit. A Li-Ion battery pack can be installed here for mobile photo printing.

Specifications label.

Power adaptor & USB connection for PC use.

Rear door opened. Showing the paper feed tray.

Rear door has been removed in this shot. Paper feed roller & platen roller can be seen here.

Paper holder attached to rear door.

Bottom of the top cover, with connections for the buttons & LCD panel.

This is the main PCB of the unit. Controls all aspects of the printer. CPU in center, card reader sockets are along bottom edge. various support circuitry surrounds the CPU.

Rear shell has been removed here. Showing the main frame & the carriage drive motor on the left.

Closeup of the carriage drive motor & timing belt system. All the motors in this printer are DC servo motors, not steppers.

Main drive motor, feeds paper, drives rollers, operates cleaning mechanism for the inkjets.

Mainshaft encoder. Main drive motor is bottom right hand side with timing belt drive.

Closeup of the CPU. This is a Phillips ARM chip, unknown spec.

Detail of the card reader sockets, this unit takes all current types of Flash memory card.

HP 95 Tri-color Inkjet Print Cartridge

Posted on August 2, 2010 by The Engineer — Leave a comment

ICL Barcode Scanner

An ICL barcode scanner from the 80s is shown here. This is the top of the unit with cover on.

Plastic cover removed from the unit showing internal components. Main PSU on left, scan assembly in center. Laser PSU & Cooling fan on right. Laser tube at top.

Closeup of laser scan motor. This unit scans the laser beam rapidly across the glass plate to read the barcode.

View of the bottom of the unit, showing the controller PCB in the centre.

The 3-phase motor driver circuit for the scan motor. 15v DC powered.

This is the laser unit disconnected from the back of the scanner. HT PSU is on right hand side, beam emerges from optics on left.

This unit is date stamped 1987. The oldest laser unit i own.

Laser tube power supply. Input voltage: 24v DC. Output: 1.8kV 4mA.

Rear of HT PSU. Obviously the factory made a mistake or two 🙂

Top cover removed from the laser unit here shows the 1mW He-Ne tube. Manufactured by Aerotech.

Tube label. Manufactured July 1993. Model LT06XR.

Here the tube has been removed from it’s mount to show the bore down the centre while energized.

OC end of the tube shown here lasing.

Beam output from the optics on the laser unit.

Optics built into the laser unit. Simple turning mirror on adjustable mount & collimating lens assembly.

Kind of hard to see but the unit is running here & projecting the scan lines on the top glass.

Laser tube mounting. A combo of spring clips & hot glue hold this He-Ne tube in place

Posted on August 1, 2010 by The Engineer — Leave a comment

Hair Dryer

This is a 1500W hairdryer, death caused by thermal switch failure.

This is the switch unit. Attached are two suppression capacitors & a blocking diode. Cold switch is on right.

Heating element unit removed from housing. Coils of Nichrome wire heat the air passing through the dryer. Fan unit is on right.

Other side of the heating element unit, here can be seen the thermal switch behind the element winding. (Black square object).

The fan motor in this dryer is a low voltage DC unit, powered through a resistor formed by part of the heating element to drop the voltage to around 12-24v. Mounted on the back of the motor here is a rectifier assembly. Guide vanes are visible around the motor, to straighten the airflow from the fan blades.

5-blade fan forces air through the element at high speed. Designed to rotate at around 13,000RPM.

Posted on July 29, 2010August 1, 2010 by The Engineer — Leave a comment

Western Digital 160GB 2.5″ HDD

This is a Western Digital drive recently removed from my laptop when it died of a severe head crash.
Top of drive can be seen here.

Here the cover has been removed from the drive, showing the platter, head arm & magnet. Yellow piece top left is head parking ramp.

The head assembly of the drive is shown here. The head itself is on the left hand end of the arm in the plastic parking ramp. The other end of the arm holds the voice coil part of the head motor, surrounded by the magnet.

Bottom of drive, with controller PCB. SATA interface socket at bottom.

PCB removed from bottom of drive. Spindle motor connections & connections to the head unit can be seen on the bottom of the drive unit.

Controller PCB. Supports the cache, interface & motor controller ICs.

Closeup of the motor driver IC, this controls the speed of the spindle motor precisely to 5,400RPM. Also controls the voice coil motor controlling the position of the head arm on the platters.

Interface IC closeup. This IC receives signals from the head assembly & processes them for transmission to the SATA bus. Also holds drive firmware, controls the Motor driver IC & all other functions of the drive.

Cache Memory IC.