Classifications

• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K29/00—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
  • H02K29/06—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with position sensing devices
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
  • G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
  • G01P3/42—Devices characterised by the use of electric or magnetic means
  • G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
  • G01P3/48—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
  • G01P3/481—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals
  • G01P3/486—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals delivered by photo-electric detectors
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
  • H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
  • H02K11/21—Devices for sensing speed or position, or actuated thereby
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
  • H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
  • H02K11/21—Devices for sensing speed or position, or actuated thereby
  • H02K11/22—Optical devices
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
  • H02K7/20—Structural association with auxiliary dynamo-electric machines, e.g. with electric starter motors or exciters

Definitions

• the present invention relates generally to the field of motors for use with sensors such as resolvers and encoders. More specifically, the present invention relates to the design of an encoder that is readily useful with a motor that was designed for use with a resolver.
• a resolver is useful to provide position and velocity information of a rotor for the motor. This information is used by external electronics to control the velocity and position of the rotor.
• the present invention is directed to a motor assembly that can readily accommodate either a resolver or an encoder. More specifically, the preferred embodiment of the present invention is directed to an encoder that is useful with a motor designed for use with a resolver.
• a motor that can interchangeably accommodate a resolver or an encoder.
• the motor includes a housing having a top portion with a curved recess located therein.
• a rotatable shaft extends from the recess of the housing.
• a connector adjacent the shaft is adapted to fit within the recess of the housing.
• An encoder is connected to the connector and is adapted to allow the shaft to pass therethrough. Accordingly, a motor is provided that may interchangeably accommodate a resolver or an encoder.
• an encoder assembly for use with a motor.
• the motor has a top surface with a curved recess located therein.
• a rotatable shaft extends outward from the top surface of the motor.
• the encoder includes a ring-shaped connector adapted to fit within the recess of the housing.
• An encoder body is connected to the ring-shaped connector and is adapted to allow the shaft to pass therethrough.
• a single fastening is adapted to secure the encoder to the motor.
• a method of assembling a -motor having-a-sensor- includes the step of providing a motor adapted to accommodate one of a resolver and an encoder.
• the method also includes the step of providing the other of the resolver and the encoder adapted to be used interchangeably with the one of the resolver and the encoder. Accordingly, a motor having a single configuration is useful with either of a resolver or encoder.
• encoder(s) is intended to be interpreted broadly to include different types of encoders such as optical, magnetic or capacitive.
• Figure 1 is a perspective view of a motor assembly including an encoder in accordance with an embodiment of the present invention
• Figure 2 is a perspective exploded view of the motor assembly as illustrated in Figure 1 ;
• Figure 3 is a side exploded view of the motor assembly as illustrated in Figures 1-2;
• Figure 4 is a top view of the motor assembly as illustrated in Figures 1- 3;
• Figure 5 is a cross-section taken along the lines 5-5 of Figure 4.
• the present invention is directed to a motor for use with a sensor, such as an encoder.
• a sensor such as an encoder.
• the encoder of the present invention is particularly useful with brushless DC servo motors.
• the present invention is useful with motors such as AC servomotors or stepper motors as well as other motors known to those of ordinary skill in the art.
• motors such as AC servomotors or stepper motors as well as other motors known to those of ordinary skill in the art.
• an optical encoder is described and shown herein, the present i ⁇ vention ' has application with other types of encoders, e.g. magnetic or capacitive.
• the present invention is useful in various applications such as industrial robots. Fig.
• the motor assembly 10 includes, in part, a motor housing 14, a connector 18 and an encoder 22.
• the motor housing 14 is a conventional element such as Part No. MPM662FME-BM manufactured by MTS Automation of New Ulm, MN.
• the encoder 22 is a conventional optical encoder element such as Part No. F142048/61932 manufactured by Danaher Controls of Gurnee, IL.
• Fastener elements including screws 26 and clips 28, are used to secure the connector 18 to the motor housing 14.
• a shaft or rotor 30 extends from the motor housing 14 and passes through a channel or shaft 32 within the encoder 22.
• Fastener elements such as a jam nut 34 and a washer 36 are used to secure the encoder 22 to the motor shaft 30.
• the connector 18 includes a servo ring 40 and a flexure or flexible connector 42.
• the servo ring 40 includes a ridge 44 that extends around the periphery thereof. Screws 26 and clips 28 are used to secure the servo ring 40. As best seen in Figs. 1 & 5, the clips 28 engage a ridge 44 in order to secure the servo ring 40 and more generally, the connector 18 to the motor housing 14.
• the servo ring 40 also includes opposing pins 50 that extend upward therefrom. Opposing cutout portions 52 are also provided on the servo ring 40.
• the servo ring 40 is formed from plastic materials or other materials such as steel or aluminum.
• the flexible connector 42 includes a plurality of apertures or first openings 58 and a plurality of apertures or second openings 60.
• the first openings 58 are sized to engage the pins 50 of the servo ring 40.
• the second openings 60 are sized to engage a plurality of pins 68 (as seen in Fig. 3) that extend downwardly from the encoder 22.
• the pins 68 then extend into the cutout portions 52 of the servo ring 40.
• the flexible connector 42 is formed from a thin flexible steel material. However, it should be recognized that other known materials could also be implemented.
• the jam nut 34 and the washer 36 are then used to secure the encoder 22 to the motor shaft 30. More specifically, the jam nut 34 secures the shaft 32 against the shoulder 74 of the motor shaft 30.
• the screws 26 and clips 48 secure the connector 18 to the motor housing 14.
• the encoder 22 is attached to the connector 18 through the tabs 68.
• the jam nut 34 and washer 36 then secure the encoder 22 against the motor shaft 30. It is an important aspect of the present invention to recognize that it allows the encoder to be fastened to the motor housing with the use of a single fastening element, e.g., the jam nut. While more than one fastening element could be used, the present invention provides for the use of a single fastening element.
• the present invention also provides for a method of operation.
• a method of assembling a motor having a sensor is provided.
• a first step requires that a motor adapted to accommodate one of a resolver and an encoder be provided.
• a second step requires that the other of the resolver and the encoder be adapted to be used interchangeably with the one of the resolver and the encoder.
• a motor that is adapted for use with one of a resolver or an encoder is readily useful with the other of a resolver or encoder.
• the motor housing is designed for use with a resolver and the encoder is adapted to fit the footprint of the resolver.

Landscapes

• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Microelectronics & Electronic Packaging (AREA)
• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Transmission And Conversion Of Sensor Element Output (AREA)
• Control Of Stepping Motors (AREA)
• Rotational Drive Of Disk (AREA)
• Optical Transform (AREA)

Priority Applications (6)

Applications Claiming Priority (2)

Publications (1)

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Family Applications (1)

Country Status (8)

Cited By (1)

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Citations (6)

Family Cites Families (21)

• 2002
  • 2002-07-31 US US10/210,184 patent/US6717302B2/en not_active Expired - Lifetime
• 2003
  • 2003-07-31 DE DE60330470T patent/DE60330470D1/de not_active Expired - Lifetime
  • 2003-07-31 WO PCT/US2003/023936 patent/WO2004012323A1/en not_active Ceased
  • 2003-07-31 CN CNB038184168A patent/CN100555812C/zh not_active Expired - Fee Related
  • 2003-07-31 AT AT03772138T patent/ATE451748T1/de not_active IP Right Cessation
  • 2003-07-31 JP JP2004524240A patent/JP2005535274A/ja active Pending
  • 2003-07-31 EP EP03772138A patent/EP1540797B1/en not_active Expired - Lifetime
  • 2003-07-31 AU AU2003257069A patent/AU2003257069A1/en not_active Abandoned

Patent Citations (6)

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