From New York Times:
It seemed like the perfect night life accessory for the South Beach set — an automated robotic parking garage where trendy clubgoers could park their Porsches with a futuristic touch of a button.
Forget hiding your GPS and favorite Fendi sunglasses from a valet who might ding your new alloy wheels; this garage would park cars itself.
Instead, malfunctions lasted for hours. Cars were smashed, and faulty machinery fell several stories to the ground. Sometimes vehicles were stuck for so long that garage operators had to pay for customers’ taxis... ( full story )
The PF/PFC series tin-can stepping motors are conventional magnet-driven rotary stepper motors with a permanent magnet in their rotor core. Rotating in proportion to the number of pulses sent to the motor, the stepper motor is frequency synchronized and can change speed depending on the frequency of the pulse signal.