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  BERGER LAHR stepper motor
  Berger Lahr , since 1934, has always depended on research development,manufactur of stepper motor and servo motor. In 1973, it invented 5-phases composite stepper motor an driver. Berger Lahr put the AC servo principle into stepper motor’s applications and developed 3-phases composite stepper motor. Bases on 5-phases composite stepper motor,the matched driver used the running style of AC servo motor driver and it drastically resolved the disadvantages of traditional stepper motor such as low-speed crawl, syntony, high noise , low torque in high speed, low frequency in starting, low reliability of driver and so on. So it is called stepper motor system which has the running characteristic of AC servo motor.  
 
 
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cases 2-phased EC motor synchronization gear box drive motor
   
  MOTEC stepper motor
 
 
  MOTEC has always depended on research development,manufactur of stepper motor and servo motor for years and is the leader in stepper drive system industry. The sine wave fractionize driver of 2-phases composite stepper motor drastically resolved the disadvantages of traditional stepper motor such as low-speed crawl, syntony, high noise , low torque in high speed, low frequency in starting, low reliability of driver and so on. Its products are widely used in robotic ,industry automatization equipment medical care instrument, advertisement instrument, lighting instrument , printing instrument, weave machine, testing instrument, outside application instrument of comouter and so on.
MOTEC 2-phases composite stepper motor Driver
MOTEC 3-phases composite stepper motor Driver