Patent ID: 9742256
Date: 2017-08-22
CPC Classifications: H02K

Claim:
1. An actuator comprising: a coil; a bobbin around which the coil is wound; a rotor positioned inside the bobbin for rotation inside the bobbin; a shaft to which the rotor is fixed and which is supported for rotation with the rotor inside the bobbin; a first stator stationary with the bobbin and including (a) a first base portion positioned on one end side of the shaft, (b) first outer magnetic pole portions extending from the first base portion along the shaft towards the other end side of the shaft radially outside the bobbin and (c) first inner magnetic pole portions extending from the first base portion along the shaft towards the other end side of the shaft the rotor and an inner periphery of the bobbin; a second stator stationary with the bobbin and including (a) a second base portion positioned on the other end side of the shaft, (b) second outer magnetic pole portions extending from the second base portion along the shaft towards the one end side of the shaft outside the bobbin and (c) second inner magnetic pole portions extending from the second base portion along the shaft towards the one end side of the shaft between the rotor and the inner periphery of the bobbin; and a cover positioned stationary with bobbin on the other end side of the shaft and comprising first holding structures configured to engage with tip portions of the first inner magnetic pole portions, respectively, to prevent the first inner magnetic pole portions from bending radially inwardly towards the rotor.