Encoder capable of erasing memory information and motor system including the same

• US 10,361,610 B2
• Filed: 07/31/2017
• Issued: 07/23/2019
• Est. Priority Date: 08/02/2016
• Status: Active Grant

• Current Assignee: Fanuc Corporation
• Original Assignee: Fanuc Corporation
• Inventors: Uematsu, Hidetoshi
• Primary Examiner(s): Ro, Bentsu
• Application Number:
  US15/664,340
• Publication Number:
  US 20180041099A1
• Time in Patent Office: 722 Days
• CPC Class Codes: G01D 5/12 using electric or magnetic means G01D5/06 takes precedence
• CPC Class Codes: G01D 5/245 using a variable number of pulses in a train
• CPC Class Codes: H02K 11/21 Devices for sensing speed or position, or actuated thereby specially adapted for machines having non-mechanical commutating devices H02K29/06, H02K29/14
• CPC Class Codes: H02K 11/25 Devices for sensing temperature, or actuated thereby
• CPC Class Codes: H02K 11/35 Devices for recording or transmitting machine parameters, e.g. memory chips or radio transmitters for diagnosis
• CPC Class Codes: H02K 5/225 Terminal boxes or connection arrangements specially adapted for submersible motors H02K5/132

Abstract

An encoder which detects information on the position or the speed of a motor includes memory which stores motor-specific information on the motor to be mounted on the encoder, a mount determination unit which determines whether the encoder has been removed from the motor, and a memory information erasure unit which erases the motor-specific information stored in the memory when the mount determination unit determines that the encoder has been removed from the motor.

Claims

1. An encoder which detects information on one of a position and a speed of a motor, the encoder comprising:

memory which stores motor-specific information on the motor to be attached to the encoder;

a mount determination unit which determines whether the encoder has been removed from the motor; and

a memory information erasure unit which erases the motor-specific information stored in the memory when the mount determination unit determines that the encoder has been removed from the motor.

2. The encoder according to claim 1, wherein

the mount determination unit comprises:

a connection detection connector which is connected to conducting wires led from a temperature sensor provided in the motor when the encoder is mounted on the motor, and is released from connection to the conducting wires when the encoder is removed from the motor; and

a determination processing unit which determines whether connection between the connection detection connector and the conducting wires has been released, and

the determination processing unit determines that the encoder has been removed from the motor when it is determined that the connection between the connection detection connector and the conducting wires has been released.

3. A motor system comprising a motor and the encoder, according to claim 2, that detects information on one of a position and a speed of the motor,

the motor comprising:

a temperature sensor which detects a temperature of the motor; and

a motor connector configured to connect conducting wires led from the temperature sensor to the connection detection connector provided in the encoder.