Patent ID: 11858128
Assignee: AMAZON TECHNOLOGIES, INC.
Field: Handling (Mechanical engineering)
Classification: CPC B  H | IPC B  H

Claim 0:
1. A robot comprising:
one or more sensors;
a brushless direct current motor (motor) having a first terminal, a second terminal, and a third terminal, wherein a shaft of the motor is coupled to a wheel;
a battery;
a relay comprising:
a coil with a first coil terminal connected to an output terminal and a second coil terminal connected to the second terminal of the motor;
a first contact connected to a first fuse terminal of a first fuse, wherein a second fuse terminal of the first fuse is connected to the second terminal of the motor; and
a second contact connected to the first terminal of the motor;

one or more processors to execute instructions to:
receive sensor data from the one or more sensors;
determine, based on the sensor data, occurrence of a stop condition; and
generate a stop signal responsive to the stop condition; and

electronic circuitry to, responsive to the stop signal:
operate a first switching mechanism to disconnect the first terminal of the motor from the battery;
operate a braking circuit to dissipate, at a predetermined rate, power produced by motion of the motor; and
responsive to a back electromotive force (EMF) produced by the motor that is below a threshold value, operate a stop circuit that when the coil is deenergized connects the first contact and the second contact.