Variable speed drive unit for electric vehicle and variable speed driving method
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Oct 27, 1998
Grant Date -
N/A
app pub date -
Jan 21, 1997
filing date -
Jan 23, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In an electric vehicle provided with an electric motor (M), a motor drive circuit (17) and a control circuit section (15) for outputting an operation command to the motor drive circuit, a variable speed drive unit for electric vehicles has a transmission apparatus (20) which engages or disengages a drive shaft (7a) which receives the drive force from a propelling motor and a driven shaft (5a) which is interconnected with propelling wheels by an electromagnetic engagement clutch (30), the transmission apparatus has the electromagnetic clutch comprised of a first clutch (22) interconnected with the drive shaft, a second clutch (25) having a rotational speed different from the first clutch, and an output side clutch (21) interconnected with the driven shaft; and the output side clutch and the first clutch or the second clutch are alternatively connected to selectively change the motor output. And, to connect the clutches mutually, the rotational speed of the clutch on the drive side is synchronized with the rotational speed of the clutch on the driven side.
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