Stepper drive system keeps quiet in US laboratory
A
Hytec Electronics product story
Edited by the Engineeringtalk editorial team
Jun 13, 2006
Hytec Electronics has recently supplied a special high-power version of its popular SMDS4 stepper motor drive system to the SLAC Laboratory in USA.
Hytec Electronics has recently supplied a special high-power version of its popular SMDS4 stepper motor drive system to the SLAC Laboratory in USA.
The particular requirement was for a system which could drive hybrid four-phase stepper motors down 90m-long cables without producing appreciable electrical noise.
A system was designed using L/R drive cards running at 5A per phase which, although very inefficient in terms of electrical heating of the series resistors, met the requirements for the noise environment.
An external power supply was required, due to the very high static current of the system (24V at 40A for all four motors) and this 1kVA unit was housed in an adjacent rack-mounting shelf with the option of hot-standby through current sharing across three PSU modules.
In this special version, the rear-panel connectors for DC input and motor output were upgraded to circular multipole high-current types.
The SMDS4 is a highly efficient and powerful stepper motor drive system for use with Hytec's range of stepper motor controllers, and particularly with the 8601 Industry Pack stepper motor controller unit with 8906 DIN-rail interface block.
It can be used with a wide variety of two- or four-phase bipolar or unipolar motors, up to frame size 34, double stack.
When fitted with bipolar chopped cards, output drive current per phase is switch selectable for each motor at up to 4A, equivalent to 6A unipolar drive, from its internal 24V supply.
Optionally, unipolar L/R drive cards can be supplied (with internally or externally mounted high power series resistors).
The unit is self-contained and is housed in a 3U high rack mounting enclosure, with all connections at the rear.
A logic card forms a high noise immunity interface between the controller and drive cards.
This logic card rejects step pulses if a limit is hit and also switches on the drive output of each channel only when the step pulses are being received, to reduce power used.
Instead of being driven from the IP-8601/8906, the SMDS4 can also be driven by the HC1, a small handheld controller with no indexing facilities.
Each motor is connected via a 15-way Cannon socket which carries phase and limit switch connections.
The I/O connector is a 37-way Cannon socket, and carries 5 and 12V logic supplies in addition to step, direction and limit signals.
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