Patent ID: 7365508

Claim:
A motor having a controller for generating rotational torque due to a predetermined magnetic flux distribution formed by controlling supplied current to coils, said controller comprising: coil on/off switching means for performing switching operations between an on-state in which current is supplied to said coils, and a first off-state in which the coil terminals are open-circuited when a low-level control signal is received, and between said on-state in which said current is supplied to said coils, and a second off-state in which the coil terminals are short-circuited when a high-level control signal is received; and coil current control means for controlling a switching operation of said coil on/off switching means according to commands input to said motor, wherein said coil current control means controls said motor to have a viscosity resistance by adjusting a ratio of said first off-state as to said second off-state, during a period wherein no current is supplied to said coils.