DC-Motor Control Projects

The scooter shown is one example of the many DC-motor control projects we have worked on. The scooter's motor current is up to 70 amps. The design includes a battery charger with a switching power supply. The motor and charger current are precisely controlled by a Microchip PIC micro controller.

The controller algorithm maintains a battery charge status and communicates that to the user by means of an LED display. Comprehensive error analysis and fault tolerance is incorporated. Our product is much more compact in its physical dimensions (See photo) as its predecessor designed by a competitor. Also lower component count provides higher reliability and lower manufacturing costs.

Through the cooperation with us, our customer MZ improved its competitive strength with a better product and better profit margins.

For further information on Microchip micro controllers that are highly versatile for a variety of applications while consuming only minimal quiescent power, check the Microchip home page: 

The controller shown on the left is one of the latest models of our PWM motor controller series. It is a two quadrant controller that features Surface Mount Technology (SMT), a built in speaker for audio signaling, voltage conversion for lighting purposes and an EEPROM for permanent configuration and status storage. The torque of the motor is directly controlled by the driver along with speed and acceleration limiting. These programmable features provide for energy efficient driving patterns along with recuperative breaking under full user control.

Technical data:
Battery	24 V lead acid, max. Voltage 33V
Motor current	-60 .. 80 A
Battery current	-40 .. 40 A
Lighting current	max. 3 A RMS, 10 A current limited, short circuit and overload protected
Display	optional LCD or LED display

Gerdes Systemtechnik 
Mühlgraben 5 
D-09669 Frankenberg 
Germany

Phone:
Fax:

xx49-37206-6009-20
xx49-37206-6009-24