ELECTROMAGNETIC TYPE RETARDER
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United States of America Patent
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Issued Date -
May 14, 2015
app pub date -
Nov 14, 2013
filing date -
Nov 14, 2013
priority date (Note) -
Abandoned
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Abstract
An electromagnetic type retarder includes a stator having spaced, circularly arranged magnetic coils forming multi-phase connections and a steel rotor surrounding the stator and rotated according to the rotation of a tire; a control device; and a driving device including at least two transistors opened and closed by a drive pulse from the control device, respectively. The multi phase connections are formed by the magnetic coils, the magnetic coils of each phase are connected with capacitors to form a resonance circuit, respectively, and each of the transistors is connected in series to at least two phase connections. The revolution speed of a rotary magnetic field induced in he magnetic coils by the rotation of the steel rotor is set smaller than the revolution speed of the steel rotor. A braking torque is controlled by turning ON and OFF the transistor inserted in one phase connection.
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