This test system comprises: a dynamometer connected to a test piece W; an inverter for supplying electric power to the dynamometer; an encoder for generating a speed detection signal N corresponding to a rotational speed of the dynamometer; and a dynamometer control device 6 for generating a torque current command signal DYref. The dynamometer control device 6 comprises: a response model 61 that receives a higher-order speed command signal Nr and outputs a model speed command signal Nr′; a feedforward controller 62 that receives the higher-order speed command signal Nr and outputs a feedforward input uff; and a speed controller 64 that generates the torque current command signal DYref on the basis of a feedback input ufb generated on the basis of a deviation e between the model speed command signal Nr′ and the speed detection signal N, and the feedforward input uff.

This test system comprises: a dynamometer connected to a test piece W; an inverter for supplying electric power to the dynamometer; an encoder for generating a speed detection signal N corresponding to a rotational speed of the dynamometer; and a dynamometer control device 6 for generating a torque current command signal DYref. The dynamometer control device 6 comprises: a response model 61 that receives a higher-order speed command signal Nr and outputs a model speed command signal Nr′; a feedforward controller 62 that receives the higher-order speed command signal Nr and outputs a feedforward input uff; and a speed controller 64 that generates the torque current command signal DYref on the basis of a feedback input ufb generated on the basis of a deviation e between the model speed command signal Nr′ and the speed detection signal N, and the feedforward input uff.

This overall control device for a testing system comprises: a plurality of resonance suppression controllers that each generate a torque current command signal for suppressing mechanical resonance between a specimen and a dynamometer upon receiving a base torque current command signal and axial torque detection signal and have different input/output characteristics; a specimen characteristic acquisition unit for acquiring the value of the moment of inertia of the specimen connected to the dynamometer; and a resonance-suppression-controller selection unit for selecting one of the plurality of resonance suppression controllers on the basis of the value of the moment of inertia acquired by the specimen characteristic acquisition unit and mounting the selected resonance suppression controller in a dynamometer control module.

This overall control device for a testing system comprises: a plurality of resonance suppression controllers that each generate a torque current command signal for suppressing mechanical resonance between a specimen and a dynamometer upon receiving a base torque current command signal and axial torque detection signal and have different input/output characteristics; a specimen characteristic acquisition unit for acquiring the value of the moment of inertia of the specimen connected to the dynamometer; and a resonance-suppression-controller selection unit for selecting one of the plurality of resonance suppression controllers on the basis of the value of the moment of inertia acquired by the specimen characteristic acquisition unit and mounting the selected resonance suppression controller in a dynamometer control module.

A motor control device controls driving of a motor, which outputs torque to a rack shaft as a load by rotation of a shaft fixed to a rotor. The motor control device has a rotation stress check unit for determining a rotation stress indicating a rotation stress, which is applied inversely from the load to a protection target member such as a shaft, bearing and oil seal related to the rotation of the shaft or torque transmission to the load. The rotation stress check unit determines the rotation stress is excessive based on that an absolute value of a rotation evaluation value exceeds a stress threshold value. The stress threshold value is set to be larger than an absolute value of an upper limit value realized in normal drive control.

A motor control device controls driving of a motor, which outputs torque to a rack shaft as a load by rotation of a shaft fixed to a rotor. The motor control device has a rotation stress check unit for determining a rotation stress indicating a rotation stress, which is applied inversely from the load to a protection target member such as a shaft, bearing and oil seal related to the rotation of the shaft or torque transmission to the load. The rotation stress check unit determines the rotation stress is excessive based on that an absolute value of a rotation evaluation value exceeds a stress threshold value. The stress threshold value is set to be larger than an absolute value of an upper limit value realized in normal drive control.

Proposed is a dynamometer for measuring load of a rotary shaft to be tested, the dynamometer comprising: a dynamometer shaft connected to the rotary shaft to be tested; a casing part having a through hole through which the dynamometer shaft passes, and a water supply chamber and a drain chamber therein; a stator part including a first stator and a second stator to be spaced apart from each other; a toroidal chamber partitioning part partitioning a toroidal chamber into a first toroidal chamber and a second toroidal chamber, wherein the toroidal chamber partitioning part comprises a runner and a guide ring, forming a drain slot through which the fluid is discharged from the first toroidal chamber and the second toroidal chamber to the drain chamber; and a flow adjusting part adjusting flow rate of the fluid.

Proposed is a dynamometer for measuring load of a rotary shaft to be tested, the dynamometer comprising: a dynamometer shaft connected to the rotary shaft to be tested; a casing part having a through hole through which the dynamometer shaft passes, and a water supply chamber and a drain chamber therein; a stator part including a first stator and a second stator to be spaced apart from each other; a toroidal chamber partitioning part partitioning a toroidal chamber into a first toroidal chamber and a second toroidal chamber, wherein the toroidal chamber partitioning part comprises a runner and a guide ring, forming a drain slot through which the fluid is discharged from the first toroidal chamber and the second toroidal chamber to the drain chamber; and a flow adjusting part adjusting flow rate of the fluid.

In an electric power steering, a control unit includes a first power module configured to supply current to first motor windings, a first control board configured to output a control signal to the first power module, a second power module configured to supply current to second motor windings, a second control board configured to output a control signal to the second power module, and a heat sink. The heat sink includes a column portion having a plurality of mounting portions defined by flat surfaces parallel to the axial direction of the output shaft. The first control board and the second control board are each mounted along a corresponding one of one pair of opposing mounting portions, and the first power module and the second power module are each mounted along a corresponding one of another pair of opposing mounting portions.

A torque sensor (200) includes a sensor unit (222), a resilient body (213), and a detection unit (223). The sensor unit (222) detects, from an output unit that is a rotational body of an actuator, a rotational position in an annular first area positioned at a first distance from a rotation center, and a rotational position in an annular second area positioned at a second distance longer than the first distance from the rotation center. The resilient body (213) is provided between the first area and the second area. The detection unit (223) detects a torque applied to the output unit, on the basis of a result of the detection by the sensor unit (222).