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Johnson Mini-EV

This is a surplus motor manufactured by Johnson Motor.  It was probably used as a cordless power tool motor.  It can have various numbers stamped on the side including 344672 and 344311.  The body is 51.3 mm in diameter and 68.8 mm long. The shaft is 5 mm in diameter and 15 mm long. Weight is approximately 1.06 lbs.

 

Specifications for rotation in both directions:

Motor only performance.

Typical system performance.
Voltage:

12 V
Angular-velocity constant:

1570 rpm/V
Torque constant:

0.86 ozf·in/A

Armature resistance:

0.0859 Ohms
No-load current:

3.4 A
Peak efficiency:

71.2 %
Power source resistance:

0 Ohms

0.0859 Ohms
Peak power:

0.535 hp

0.254 hp
No-load angular velocity:

18400 rpm

18000 rpm
Stall current:

140 A

69.8 A
Stall torque:

117 ozf·in

57 ozf·in

Explanation of specifications.

 
 

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Page last modified 08/07/07.