Home      Online Store      Events      Contact Us Sailing on RED!
 

Online store

Batteries

Brochure
Manual
Newsletter
WW Cleaning

Woods
    Bloodwood
    Bubinga
    Cherry
    Lacewood
    Maple
    Padauk
    Purpleheart
    Tigerwood
    Walnut
    Wenge
    Zebrawood

Detail views:
    Front View
    Right View
    Left View
    Top View
    Internals

Ratios
Specifications
Warranty

Events
Retreats

Owner Feedback
Reviews/Media
Video

Other espinners

Directions
History
About Us

 

HansenCrafts LLC
710 East Park Ave
Port Townsend, WA 98368
USA

(360) 747-7746

email us!


Internals of the miniSpinner  

This is a photo of the motor and speed controller used in the miniSpinner

The motor is 23mm in diameter and 42 mm long.  It's a German-made coreless rotor 12 volt, 17 watt micromotor.  The shaft rides in two sealed high-precision ball bearings instead of the bronze sleeves used on cheap motors.  This motor is very quiet, durable, highly efficient, and has a remarkable amount of torque for its size.  

Motors like this are commonly used in aeronautical and spacecraft applications like the Mars Rover, high-end medical robots and lab equipment, and that sort of thing.  They are outrageously expensive.  If you wish to buy one from the US distributor, it'll cost you over $200 without the sheave (whorl to you spinners).  I make those on my Hardinge CNC lathe.

The speed controller is 1.5 by 2 inches.  This is the almost-final prototype of my latest design using mostly surface mount components, which means the boards can be fabricated by automated machinery.  I assemble prototypes by hand, but the parts are tiny and it takes some practice to solder them successfully.  The smallest parts on this board are 0.120 x 0.060 inches in size.  I will go smaller in the next model of miniSpinner as it'll have to fit much more functionality in about the same amount of space.

I designed this speed controller.  It controls the motor speed using a technique called pulse width modulation (PWM), which in simple terms means switching the power on and off very rapidly at a specific rate and duration.  It is a very efficient way of controlling motor speed, and allows a motor to produce close to its maximum torque at any speed.

This board contains a regulated 5 volt power supply for the PIC microcontroller and associated circuitry, a self-resetting 1.2 amp circuit breaker to protect against short circuits or overloads, and a MOSFET that can handle loads of up to 14 amps at around 55 volts for controlling the motor current.  Overkill, but highly reliable as a result.

The nice thing about using the microcontroller (the 8-pin integrated circuit in the upper left corner of the board) is that it's programmable.  I can easily tailor the behavior of the speed controller by reprogramming the chip.   It also minimizes the number of components which improves reliability.

I really like playing with this kind of stuff.  Always have.


Previous Page Next Page

Site updated:  October 12, 2014

2005-2014 HansenCrafts LLC, all rights reserved